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2758 lines
106 KiB
2758 lines
106 KiB
![]()
4 years ago
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// misc.h - originally written and placed in the public domain by Wei Dai
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/// \file misc.h
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/// \brief Utility functions for the Crypto++ library.
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#ifndef CRYPTOPP_MISC_H
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#define CRYPTOPP_MISC_H
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#include "cryptlib.h"
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#include "secblockfwd.h"
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#include "smartptr.h"
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#include "stdcpp.h"
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#include "trap.h"
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#if !defined(CRYPTOPP_DOXYGEN_PROCESSING)
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#if (CRYPTOPP_MSC_VERSION)
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# pragma warning(push)
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# pragma warning(disable: 4146 4514)
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# if (CRYPTOPP_MSC_VERSION >= 1400)
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# pragma warning(disable: 6326)
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# endif
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#endif
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// Issue 340 and Issue 793
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#if CRYPTOPP_GCC_DIAGNOSTIC_AVAILABLE
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# pragma GCC diagnostic push
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# pragma GCC diagnostic ignored "-Wconversion"
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# pragma GCC diagnostic ignored "-Wsign-conversion"
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# pragma GCC diagnostic ignored "-Wunused-function"
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#endif
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#ifdef _MSC_VER
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#if _MSC_VER >= 1400
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// VC2005 workaround: disable declarations that conflict with winnt.h
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#define _interlockedbittestandset CRYPTOPP_DISABLED_INTRINSIC_1
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#define _interlockedbittestandreset CRYPTOPP_DISABLED_INTRINSIC_2
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#define _interlockedbittestandset64 CRYPTOPP_DISABLED_INTRINSIC_3
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#define _interlockedbittestandreset64 CRYPTOPP_DISABLED_INTRINSIC_4
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#include <intrin.h>
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#undef _interlockedbittestandset
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#undef _interlockedbittestandreset
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#undef _interlockedbittestandset64
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#undef _interlockedbittestandreset64
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#define CRYPTOPP_FAST_ROTATE(x) 1
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#elif _MSC_VER >= 1300
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#define CRYPTOPP_FAST_ROTATE(x) ((x) == 32 | (x) == 64)
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#else
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#define CRYPTOPP_FAST_ROTATE(x) ((x) == 32)
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#endif
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#elif (defined(__MWERKS__) && TARGET_CPU_PPC) || \
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(defined(__GNUC__) && (defined(_ARCH_PWR2) || defined(_ARCH_PWR) || defined(_ARCH_PPC) || defined(_ARCH_PPC64) || defined(_ARCH_COM)))
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#define CRYPTOPP_FAST_ROTATE(x) ((x) == 32)
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#elif defined(__GNUC__) && (CRYPTOPP_BOOL_X64 || CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X86) // depend on GCC's peephole optimization to generate rotate instructions
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#define CRYPTOPP_FAST_ROTATE(x) 1
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#else
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#define CRYPTOPP_FAST_ROTATE(x) 0
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#endif
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#ifdef __BORLANDC__
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#include <mem.h>
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#include <stdlib.h>
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#endif
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#if (defined(__GNUC__) || defined(__clang__)) && defined(__linux__)
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#define CRYPTOPP_BYTESWAP_AVAILABLE 1
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#include <byteswap.h>
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#endif
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// Limit to ARM A-32. Aarch64 is failing self tests.
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#if defined(__arm__) && (defined(__GNUC__) || defined(__clang__)) && (__ARM_ARCH >= 6)
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#define CRYPTOPP_ARM_BYTEREV_AVAILABLE 1
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#endif
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// Limit to ARM A-32. Aarch64 is failing self tests.
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#if defined(__arm__) && (defined(__GNUC__) || defined(__clang__)) && (__ARM_ARCH >= 7)
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#define CRYPTOPP_ARM_BITREV_AVAILABLE 1
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#endif
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#if defined(__BMI__)
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# include <x86intrin.h>
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# include <immintrin.h>
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#endif // GCC and BMI
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// More LLVM bullshit. Apple Clang 6.0 does not define them.
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// Later version of Clang defines them and results in warnings.
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#if defined(__clang__)
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# ifndef _blsr_u32
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# define _blsr_u32 __blsr_u32
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# endif
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# ifndef _blsr_u64
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# define _blsr_u64 __blsr_u64
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# endif
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# ifndef _tzcnt_u32
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# define _tzcnt_u32 __tzcnt_u32
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# endif
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# ifndef _tzcnt_u64
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# define _tzcnt_u64 __tzcnt_u64
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# endif
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#endif
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#endif // CRYPTOPP_DOXYGEN_PROCESSING
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#if CRYPTOPP_DOXYGEN_PROCESSING
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/// \brief The maximum value of a machine word
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/// \details <tt>SIZE_MAX</tt> provides the maximum value of a machine word. The value
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/// is <tt>0xffffffff</tt> on 32-bit targets, and <tt>0xffffffffffffffff</tt> on 64-bit
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/// targets.
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/// \details If <tt>SIZE_MAX</tt> is not defined, then <tt>__SIZE_MAX__</tt> is used if
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/// defined. If not defined, then <tt>SIZE_T_MAX</tt> is used if defined. If not defined,
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/// then the library uses <tt>std::numeric_limits<size_t>::max()</tt>.
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/// \details The library prefers <tt>__SIZE_MAX__</tt> or <tt>__SIZE_T_MAX__</tt> because
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/// they are effectively <tt>constexpr</tt> that is optimized well by all compilers.
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/// <tt>std::numeric_limits<size_t>::max()</tt> is not always a <tt>constexpr</tt>, and
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/// it is not always optimized well.
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# define SIZE_MAX ...
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#else
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// Its amazing portability problems still plague this simple concept in 2015.
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// http://stackoverflow.com/questions/30472731/which-c-standard-header-defines-size-max
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// Avoid NOMINMAX macro on Windows. http://support.microsoft.com/en-us/kb/143208
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#ifndef SIZE_MAX
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# if defined(__SIZE_MAX__)
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# define SIZE_MAX __SIZE_MAX__
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# elif defined(SIZE_T_MAX)
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# define SIZE_MAX SIZE_T_MAX
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# elif defined(__SIZE_TYPE__)
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# define SIZE_MAX (~(__SIZE_TYPE__)0)
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# else
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# define SIZE_MAX ((std::numeric_limits<size_t>::max)())
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# endif
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#endif
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#endif // CRYPTOPP_DOXYGEN_PROCESSING
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NAMESPACE_BEGIN(CryptoPP)
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// Forward declaration for IntToString specialization
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class Integer;
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// ************** compile-time assertion ***************
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#if CRYPTOPP_DOXYGEN_PROCESSING
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/// \brief Compile time assertion
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/// \param expr the expression to evaluate
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/// \details Asserts the expression <tt>expr</tt> during compile. If C++14 and
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/// N3928 are available, then C++14 <tt>static_assert</tt> is used. Otherwise,
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/// a <tt>CompileAssert</tt> structure is used. When the structure is used
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/// a negative-sized array triggers the assert at compile time.
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# define CRYPTOPP_COMPILE_ASSERT(expr) { ... }
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#elif defined(CRYPTOPP_CXX17_STATIC_ASSERT)
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# define CRYPTOPP_COMPILE_ASSERT(expr) static_assert(expr)
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#else // CRYPTOPP_DOXYGEN_PROCESSING
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template <bool b>
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struct CompileAssert
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{
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static char dummy[2*b-1];
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};
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#define CRYPTOPP_COMPILE_ASSERT(assertion) CRYPTOPP_COMPILE_ASSERT_INSTANCE(assertion, __LINE__)
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#define CRYPTOPP_ASSERT_JOIN(X, Y) CRYPTOPP_DO_ASSERT_JOIN(X, Y)
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#define CRYPTOPP_DO_ASSERT_JOIN(X, Y) X##Y
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#if defined(CRYPTOPP_EXPORTS) || defined(CRYPTOPP_IMPORTS)
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# define CRYPTOPP_COMPILE_ASSERT_INSTANCE(assertion, instance)
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#else
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# if defined(__GNUC__) || defined(__clang__)
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# define CRYPTOPP_COMPILE_ASSERT_INSTANCE(assertion, instance) \
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static CompileAssert<(assertion)> \
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CRYPTOPP_ASSERT_JOIN(cryptopp_CRYPTOPP_ASSERT_, instance) __attribute__ ((unused))
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# else
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# define CRYPTOPP_COMPILE_ASSERT_INSTANCE(assertion, instance) \
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static CompileAssert<(assertion)> \
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CRYPTOPP_ASSERT_JOIN(cryptopp_CRYPTOPP_ASSERT_, instance)
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# endif // GCC or Clang
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#endif
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#endif // CRYPTOPP_DOXYGEN_PROCESSING
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// ************** count elements in an array ***************
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#if CRYPTOPP_DOXYGEN_PROCESSING
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/// \brief Counts elements in an array
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/// \param arr an array of elements
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/// \details COUNTOF counts elements in an array. On Windows COUNTOF(x) is defined
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/// to <tt>_countof(x)</tt> to ensure correct results for pointers.
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/// \note COUNTOF does not produce correct results with pointers, and an array must be used.
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/// <tt>sizeof(x)/sizeof(x[0])</tt> suffers the same problem. The risk is eliminated by using
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/// <tt>_countof(x)</tt> on Windows. Windows will provide the immunity for other platforms.
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# define COUNTOF(arr)
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#else
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// VS2005 added _countof
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#ifndef COUNTOF
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# if defined(_MSC_VER) && (_MSC_VER >= 1400)
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# define COUNTOF(x) _countof(x)
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# else
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# define COUNTOF(x) (sizeof(x)/sizeof(x[0]))
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# endif
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#endif // COUNTOF
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#endif // CRYPTOPP_DOXYGEN_PROCESSING
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// ************** misc classes ***************
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/// \brief An Empty class
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/// \details The Empty class can be used as a template parameter <tt>BASE</tt> when no base class exists.
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class CRYPTOPP_DLL Empty
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{
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};
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#if !defined(CRYPTOPP_DOXYGEN_PROCESSING)
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template <class BASE1, class BASE2>
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class CRYPTOPP_NO_VTABLE TwoBases : public BASE1, public BASE2
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{
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};
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template <class BASE1, class BASE2, class BASE3>
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class CRYPTOPP_NO_VTABLE ThreeBases : public BASE1, public BASE2, public BASE3
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{
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};
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#endif // CRYPTOPP_DOXYGEN_PROCESSING
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/// \tparam T class or type
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/// \brief Uses encapsulation to hide an object in derived classes
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/// \details The object T is declared as protected.
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template <class T>
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class ObjectHolder
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{
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protected:
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T m_object;
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};
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/// \brief Ensures an object is not copyable
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/// \details NotCopyable ensures an object is not copyable by making the
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/// copy constructor and assignment operator private. Deleters are used
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/// under C++11.
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/// \sa Clonable class
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class NotCopyable
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{
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public:
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NotCopyable() {}
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#if CRYPTOPP_CXX11_DELETED_FUNCTIONS
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NotCopyable(const NotCopyable &) = delete;
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void operator=(const NotCopyable &) = delete;
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#else
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private:
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NotCopyable(const NotCopyable &);
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void operator=(const NotCopyable &);
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#endif
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};
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/// \brief An object factory function
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/// \tparam T class or type
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/// \details NewObject overloads operator()().
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template <class T>
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struct NewObject
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{
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T* operator()() const {return new T;}
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};
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#if CRYPTOPP_DOXYGEN_PROCESSING
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/// \brief A memory barrier
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/// \details MEMORY_BARRIER attempts to ensure reads and writes are completed
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/// in the absence of a language synchronization point. It is used by the
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/// Singleton class if the compiler supports it. The barrier is provided at the
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/// customary places in a double-checked initialization.
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/// \details Internally, MEMORY_BARRIER uses <tt>std::atomic_thread_fence</tt> if
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/// C++11 atomics are available. Otherwise, <tt>intrinsic(_ReadWriteBarrier)</tt>,
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/// <tt>_ReadWriteBarrier()</tt> or <tt>__asm__("" ::: "memory")</tt> is used.
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#define MEMORY_BARRIER ...
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#else
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#if defined(CRYPTOPP_CXX11_ATOMIC)
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# define MEMORY_BARRIER() std::atomic_thread_fence(std::memory_order_acq_rel)
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#elif (_MSC_VER >= 1400)
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# pragma intrinsic(_ReadWriteBarrier)
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# define MEMORY_BARRIER() _ReadWriteBarrier()
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#elif defined(__INTEL_COMPILER)
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# define MEMORY_BARRIER() __memory_barrier()
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#elif defined(__GNUC__) || defined(__clang__)
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# define MEMORY_BARRIER() __asm__ __volatile__ ("" ::: "memory")
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#else
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# define MEMORY_BARRIER()
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#endif
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#endif // CRYPTOPP_DOXYGEN_PROCESSING
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/// \brief Restricts the instantiation of a class to one static object without locks
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/// \tparam T the class or type
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/// \tparam F the object factory for T
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/// \tparam instance an instance counter for the class object
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/// \details This class safely initializes a static object in a multithreaded environment. For C++03
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/// and below it will do so without using locks for portability. If two threads call Ref() at the same
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/// time, they may get back different references, and one object may end up being memory leaked. This
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/// is by design and it avoids a subltle initialization problem ina multithreaded environment with thread
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/// local storage on early Windows platforms, like Windows XP and Windows 2003.
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/// \details For C++11 and above, a standard double-checked locking pattern with thread fences
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/// are used. The locks and fences are standard and do not hinder portability.
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/// \details Microsoft's C++11 implementation provides the necessary primitive support on Windows Vista and
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/// above when using Visual Studio 2015 (<tt>cl.exe</tt> version 19.00). If C++11 is desired, you should
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/// set <tt>WINVER</tt> or <tt>_WIN32_WINNT</tt> to 0x600 (or above), and compile with Visual Studio 2015.
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/// \sa <A HREF="http://preshing.com/20130930/double-checked-locking-is-fixed-in-cpp11/">Double-Checked Locking
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/// is Fixed In C++11</A>, <A HREF="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2660.htm">Dynamic
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/// Initialization and Destruction with Concurrency</A> and
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/// <A HREF="http://msdn.microsoft.com/en-us/library/6yh4a9k1.aspx">Thread Local Storage (TLS)</A> on MSDN.
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/// \since Crypto++ 5.2
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template <class T, class F = NewObject<T>, int instance=0>
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class Singleton
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{
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public:
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Singleton(F objectFactory = F()) : m_objectFactory(objectFactory) {}
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// prevent this function from being inlined
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CRYPTOPP_NOINLINE const T & Ref(CRYPTOPP_NOINLINE_DOTDOTDOT) const;
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private:
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F m_objectFactory;
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};
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/// \brief Return a reference to the inner Singleton object
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/// \tparam T the class or type
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/// \tparam F the object factory for T
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/// \tparam instance an instance counter for the class object
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/// \details Ref() is used to create the object using the object factory. The
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/// object is only created once with the limitations discussed in the class documentation.
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/// \sa <A HREF="http://preshing.com/20130930/double-checked-locking-is-fixed-in-cpp11/">Double-Checked Locking is Fixed In C++11</A>
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/// \since Crypto++ 5.2
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template <class T, class F, int instance>
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const T & Singleton<T, F, instance>::Ref(CRYPTOPP_NOINLINE_DOTDOTDOT) const
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{
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#if defined(CRYPTOPP_CXX11_ATOMIC) && defined(CRYPTOPP_CXX11_SYNCHRONIZATION) && defined(CRYPTOPP_CXX11_STATIC_INIT)
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static std::mutex s_mutex;
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static std::atomic<T*> s_pObject;
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T *p = s_pObject.load(std::memory_order_relaxed);
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std::atomic_thread_fence(std::memory_order_acquire);
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if (p)
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return *p;
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std::lock_guard<std::mutex> lock(s_mutex);
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p = s_pObject.load(std::memory_order_relaxed);
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std::atomic_thread_fence(std::memory_order_acquire);
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if (p)
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return *p;
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T *newObject = m_objectFactory();
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s_pObject.store(newObject, std::memory_order_relaxed);
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std::atomic_thread_fence(std::memory_order_release);
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return *newObject;
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#else
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static volatile simple_ptr<T> s_pObject;
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T *p = s_pObject.m_p;
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MEMORY_BARRIER();
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if (p)
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return *p;
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T *newObject = m_objectFactory();
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p = s_pObject.m_p;
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MEMORY_BARRIER();
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if (p)
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{
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delete newObject;
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return *p;
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}
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s_pObject.m_p = newObject;
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MEMORY_BARRIER();
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return *newObject;
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#endif
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||
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}
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||
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||
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// ************** misc functions ***************
|
||
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|
||
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/// \brief Create a pointer with an offset
|
||
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/// \tparam PTR a pointer type
|
||
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/// \tparam OFF a size type
|
||
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/// \param pointer a pointer
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||
|
/// \param offset a offset into the pointer
|
||
|
/// \details PtrAdd can be used to squash Clang and GCC
|
||
|
/// UBsan findings for pointer addition and subtraction.
|
||
|
template <typename PTR, typename OFF>
|
||
|
inline PTR PtrAdd(PTR pointer, OFF offset)
|
||
|
{
|
||
|
return pointer+static_cast<ptrdiff_t>(offset);
|
||
|
}
|
||
|
|
||
|
/// \brief Create a pointer with an offset
|
||
|
/// \tparam PTR a pointer type
|
||
|
/// \tparam OFF a size type
|
||
|
/// \param pointer a pointer
|
||
|
/// \param offset a offset into the pointer
|
||
|
/// \details PtrSub can be used to squash Clang and GCC
|
||
|
/// UBsan findings for pointer addition and subtraction.
|
||
|
template <typename PTR, typename OFF>
|
||
|
inline PTR PtrSub(PTR pointer, OFF offset)
|
||
|
{
|
||
|
return pointer-static_cast<ptrdiff_t>(offset);
|
||
|
}
|
||
|
|
||
|
/// \brief Determine pointer difference
|
||
|
/// \tparam PTR a pointer type
|
||
|
/// \param pointer1 the first pointer
|
||
|
/// \param pointer2 the second pointer
|
||
|
/// \details PtrDiff can be used to squash Clang and GCC
|
||
|
/// UBsan findings for pointer addition and subtraction.
|
||
|
/// pointer1 and pointer2 must point to the same object or
|
||
|
/// array (or one past the end), and yields the number of
|
||
|
/// elements (not bytes) difference.
|
||
|
template <typename PTR>
|
||
|
inline ptrdiff_t PtrDiff(const PTR pointer1, const PTR pointer2)
|
||
|
{
|
||
|
return pointer1 - pointer2;
|
||
|
}
|
||
|
|
||
|
/// \brief Determine pointer difference
|
||
|
/// \tparam PTR a pointer type
|
||
|
/// \param pointer1 the first pointer
|
||
|
/// \param pointer2 the second pointer
|
||
|
/// \details PtrByteDiff can be used to squash Clang and GCC
|
||
|
/// UBsan findings for pointer addition and subtraction.
|
||
|
/// pointer1 and pointer2 must point to the same object or
|
||
|
/// array (or one past the end), and yields the number of
|
||
|
/// bytes (not elements) difference.
|
||
|
template <typename PTR>
|
||
|
inline size_t PtrByteDiff(const PTR pointer1, const PTR pointer2)
|
||
|
{
|
||
|
return (size_t)(reinterpret_cast<uintptr_t>(pointer1) - reinterpret_cast<uintptr_t>(pointer2));
|
||
|
}
|
||
|
|
||
|
/// \brief Pointer to the first element of a string
|
||
|
/// \param str std::string
|
||
|
/// \details BytePtr returns NULL pointer for an empty string.
|
||
|
/// \return Pointer to the first element of a string
|
||
|
/// \since Crypto++ 8.0
|
||
|
inline byte* BytePtr(std::string& str)
|
||
|
{
|
||
|
// Caller wants a writeable pointer
|
||
|
CRYPTOPP_ASSERT(str.empty() == false);
|
||
|
|
||
|
if (str.empty())
|
||
|
return NULLPTR;
|
||
|
return reinterpret_cast<byte*>(&str[0]);
|
||
|
}
|
||
|
|
||
|
/// \brief Pointer to the first element of a string
|
||
|
/// \param str SecByteBlock
|
||
|
/// \details BytePtr returns NULL pointer for an empty string.
|
||
|
/// \return Pointer to the first element of a string
|
||
|
/// \since Crypto++ 8.3
|
||
|
byte* BytePtr(SecByteBlock& str);
|
||
|
|
||
|
/// \brief Const pointer to the first element of a string
|
||
|
/// \param str std::string
|
||
|
/// \details ConstBytePtr returns non-NULL pointer for an empty string.
|
||
|
/// \return Pointer to the first element of a string
|
||
|
/// \since Crypto++ 8.0
|
||
|
inline const byte* ConstBytePtr(const std::string& str)
|
||
|
{
|
||
|
if (str.empty())
|
||
|
return NULLPTR;
|
||
|
return reinterpret_cast<const byte*>(&str[0]);
|
||
|
}
|
||
|
|
||
|
/// \brief Const pointer to the first element of a string
|
||
|
/// \param str SecByteBlock
|
||
|
/// \details ConstBytePtr returns non-NULL pointer for an empty string.
|
||
|
/// \return Pointer to the first element of a string
|
||
|
/// \since Crypto++ 8.3
|
||
|
const byte* ConstBytePtr(const SecByteBlock& str);
|
||
|
|
||
|
/// \brief Size of a string
|
||
|
/// \param str std::string
|
||
|
/// \return size of a string
|
||
|
inline size_t BytePtrSize(const std::string& str)
|
||
|
{
|
||
|
return str.size();
|
||
|
}
|
||
|
|
||
|
/// \brief Size of a string
|
||
|
/// \param str SecByteBlock
|
||
|
/// \return size of a string
|
||
|
size_t BytePtrSize(const SecByteBlock& str);
|
||
|
|
||
|
#if (!__STDC_WANT_SECURE_LIB__ && !defined(_MEMORY_S_DEFINED)) || defined(CRYPTOPP_WANT_SECURE_LIB)
|
||
|
|
||
|
/// \brief Bounds checking replacement for memcpy()
|
||
|
/// \param dest pointer to the desination memory block
|
||
|
/// \param sizeInBytes size of the desination memory block, in bytes
|
||
|
/// \param src pointer to the source memory block
|
||
|
/// \param count the number of bytes to copy
|
||
|
/// \throws InvalidArgument
|
||
|
/// \details ISO/IEC TR-24772 provides bounds checking interfaces for potentially
|
||
|
/// unsafe functions like memcpy(), strcpy() and memmove(). However,
|
||
|
/// not all standard libraries provides them, like Glibc. The library's
|
||
|
/// memcpy_s() is a near-drop in replacement. Its only a near-replacement
|
||
|
/// because the library's version throws an InvalidArgument on a bounds violation.
|
||
|
/// \details memcpy_s() and memmove_s() are guarded by __STDC_WANT_SECURE_LIB__.
|
||
|
/// If __STDC_WANT_SECURE_LIB__ is not defined or defined to 0, then the library
|
||
|
/// makes memcpy_s() and memmove_s() available. The library will also optionally
|
||
|
/// make the symbols available if <tt>CRYPTOPP_WANT_SECURE_LIB</tt> is defined.
|
||
|
/// <tt>CRYPTOPP_WANT_SECURE_LIB</tt> is in config.h, but it is disabled by default.
|
||
|
/// \details memcpy_s() will assert the pointers src and dest are not NULL
|
||
|
/// in debug builds. Passing NULL for either pointer is undefined behavior.
|
||
|
inline void memcpy_s(void *dest, size_t sizeInBytes, const void *src, size_t count)
|
||
|
{
|
||
|
// Safer functions on Windows for C&A, http://github.com/weidai11/cryptopp/issues/55
|
||
|
|
||
|
// Pointers must be valid; otherwise undefined behavior
|
||
|
CRYPTOPP_ASSERT(dest != NULLPTR); CRYPTOPP_ASSERT(src != NULLPTR);
|
||
|
// Restricted pointers. We want to check ranges, but it is not clear how to do it.
|
||
|
CRYPTOPP_ASSERT(src != dest);
|
||
|
// Destination buffer must be large enough to satsify request
|
||
|
CRYPTOPP_ASSERT(sizeInBytes >= count);
|
||
|
|
||
|
if (count > sizeInBytes)
|
||
|
throw InvalidArgument("memcpy_s: buffer overflow");
|
||
|
|
||
|
#if CRYPTOPP_MSC_VERSION
|
||
|
# pragma warning(push)
|
||
|
# pragma warning(disable: 4996)
|
||
|
# if (CRYPTOPP_MSC_VERSION >= 1400)
|
||
|
# pragma warning(disable: 6386)
|
||
|
# endif
|
||
|
#endif
|
||
|
if (src != NULLPTR && dest != NULLPTR)
|
||
|
std::memcpy(dest, src, count);
|
||
|
#if CRYPTOPP_MSC_VERSION
|
||
|
# pragma warning(pop)
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
/// \brief Bounds checking replacement for memmove()
|
||
|
/// \param dest pointer to the desination memory block
|
||
|
/// \param sizeInBytes size of the desination memory block, in bytes
|
||
|
/// \param src pointer to the source memory block
|
||
|
/// \param count the number of bytes to copy
|
||
|
/// \throws InvalidArgument
|
||
|
/// \details ISO/IEC TR-24772 provides bounds checking interfaces for potentially
|
||
|
/// unsafe functions like memcpy(), strcpy() and memmove(). However,
|
||
|
/// not all standard libraries provides them, like Glibc. The library's
|
||
|
/// memmove_s() is a near-drop in replacement. Its only a near-replacement
|
||
|
/// because the library's version throws an InvalidArgument on a bounds violation.
|
||
|
/// \details memcpy_s() and memmove_s() are guarded by __STDC_WANT_SECURE_LIB__.
|
||
|
/// If __STDC_WANT_SECURE_LIB__ is not defined or defined to 0, then the library
|
||
|
/// makes memcpy_s() and memmove_s() available. The library will also optionally
|
||
|
/// make the symbols available if <tt>CRYPTOPP_WANT_SECURE_LIB</tt> is defined.
|
||
|
/// <tt>CRYPTOPP_WANT_SECURE_LIB</tt> is in config.h, but it is disabled by default.
|
||
|
/// \details memmove_s() will assert the pointers src and dest are not NULL
|
||
|
/// in debug builds. Passing NULL for either pointer is undefined behavior.
|
||
|
inline void memmove_s(void *dest, size_t sizeInBytes, const void *src, size_t count)
|
||
|
{
|
||
|
// Safer functions on Windows for C&A, http://github.com/weidai11/cryptopp/issues/55
|
||
|
|
||
|
// Pointers must be valid; otherwise undefined behavior
|
||
|
CRYPTOPP_ASSERT(dest != NULLPTR); CRYPTOPP_ASSERT(src != NULLPTR);
|
||
|
// Destination buffer must be large enough to satsify request
|
||
|
CRYPTOPP_ASSERT(sizeInBytes >= count);
|
||
|
|
||
|
if (count > sizeInBytes)
|
||
|
throw InvalidArgument("memmove_s: buffer overflow");
|
||
|
|
||
|
#if CRYPTOPP_MSC_VERSION
|
||
|
# pragma warning(push)
|
||
|
# pragma warning(disable: 4996)
|
||
|
# if (CRYPTOPP_MSC_VERSION >= 1400)
|
||
|
# pragma warning(disable: 6386)
|
||
|
# endif
|
||
|
#endif
|
||
|
if (src != NULLPTR && dest != NULLPTR)
|
||
|
std::memmove(dest, src, count);
|
||
|
#if CRYPTOPP_MSC_VERSION
|
||
|
# pragma warning(pop)
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
#if __BORLANDC__ >= 0x620
|
||
|
// C++Builder 2010 workaround: can't use std::memcpy_s because it doesn't allow 0 lengths
|
||
|
# define memcpy_s CryptoPP::memcpy_s
|
||
|
# define memmove_s CryptoPP::memmove_s
|
||
|
#endif
|
||
|
|
||
|
#endif // __STDC_WANT_SECURE_LIB__
|
||
|
|
||
|
/// \brief Swaps two variables which are arrays
|
||
|
/// \tparam T class or type
|
||
|
/// \param a the first value
|
||
|
/// \param b the second value
|
||
|
/// \details C++03 does not provide support for <tt>std::swap(__m128i a, __m128i b)</tt>
|
||
|
/// because <tt>__m128i</tt> is an <tt>unsigned long long[2]</tt>. Most compilers
|
||
|
/// support it out of the box, but Sun Studio C++ compilers 12.2 and 12.3 do not.
|
||
|
/// \sa <A HREF="http://stackoverflow.com/q/38417413">How to swap two __m128i variables
|
||
|
/// in C++03 given its an opaque type and an array?</A> on Stack Overflow.
|
||
|
template <class T>
|
||
|
inline void vec_swap(T& a, T& b)
|
||
|
{
|
||
|
// __m128i is an unsigned long long[2], and support for swapping it was
|
||
|
// not added until C++11. SunCC 12.1 - 12.3 fail to consume the swap; while
|
||
|
// SunCC 12.4 consumes it without -std=c++11.
|
||
|
#if defined(__SUNPRO_CC) && (__SUNPRO_CC <= 0x5120)
|
||
|
T t;
|
||
|
t=a, a=b, b=t;
|
||
|
#else
|
||
|
std::swap(a, b);
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
/// \brief Memory block initializer
|
||
|
/// \param ptr pointer to the memory block being written
|
||
|
/// \param val the integer value to write for each byte
|
||
|
/// \param num the size of the source memory block, in bytes
|
||
|
/// \details Internally the function calls memset with the value <tt>val</tt>.
|
||
|
/// memset_z can be used to initialize a freshly allocated memory block.
|
||
|
/// To zeroize a memory block on destruction use <tt>SecureWipeBuffer</tt>.
|
||
|
/// \returns the pointer to the memory block
|
||
|
/// \sa SecureWipeBuffer
|
||
|
inline void * memset_z(void *ptr, int val, size_t num)
|
||
|
{
|
||
|
// avoid extranous warning on GCC 4.3.2 Ubuntu 8.10
|
||
|
#if CRYPTOPP_GCC_VERSION >= 30001 || CRYPTOPP_LLVM_CLANG_VERSION >= 20800 || \
|
||
|
CRYPTOPP_APPLE_CLANG_VERSION >= 30000
|
||
|
if (__builtin_constant_p(num) && num==0)
|
||
|
return ptr;
|
||
|
#endif
|
||
|
return std::memset(ptr, val, num);
|
||
|
}
|
||
|
|
||
|
/// \brief Replacement function for std::min
|
||
|
/// \tparam T class or type
|
||
|
/// \param a the first value
|
||
|
/// \param b the second value
|
||
|
/// \returns the minimum value based on a comparison of <tt>b \< a</tt> using <tt>operator\<</tt>
|
||
|
/// \details STDMIN was provided because the library could not easily use std::min or std::max in Windows or Cygwin 1.1.0
|
||
|
template <class T> inline const T& STDMIN(const T& a, const T& b)
|
||
|
{
|
||
|
return b < a ? b : a;
|
||
|
}
|
||
|
|
||
|
/// \brief Replacement function for std::max
|
||
|
/// \tparam T class or type
|
||
|
/// \param a the first value
|
||
|
/// \param b the second value
|
||
|
/// \returns the minimum value based on a comparison of <tt>a \< b</tt> using <tt>operator\<</tt>
|
||
|
/// \details STDMAX was provided because the library could not easily use std::min or std::max in Windows or Cygwin 1.1.0
|
||
|
template <class T> inline const T& STDMAX(const T& a, const T& b)
|
||
|
{
|
||
|
return a < b ? b : a;
|
||
|
}
|
||
|
|
||
|
#if CRYPTOPP_MSC_VERSION
|
||
|
# pragma warning(push)
|
||
|
# pragma warning(disable: 4389)
|
||
|
#endif
|
||
|
|
||
|
#if CRYPTOPP_GCC_DIAGNOSTIC_AVAILABLE
|
||
|
# pragma GCC diagnostic push
|
||
|
# pragma GCC diagnostic ignored "-Wsign-compare"
|
||
|
# pragma GCC diagnostic ignored "-Wstrict-overflow"
|
||
|
# if (CRYPTOPP_LLVM_CLANG_VERSION >= 20800) || (CRYPTOPP_APPLE_CLANG_VERSION >= 30000)
|
||
|
# pragma GCC diagnostic ignored "-Wtautological-compare"
|
||
|
# elif (CRYPTOPP_GCC_VERSION >= 40300)
|
||
|
# pragma GCC diagnostic ignored "-Wtype-limits"
|
||
|
# endif
|
||
|
#endif
|
||
|
|
||
|
/// \brief Safe comparison of values that could be neagtive and incorrectly promoted
|
||
|
/// \tparam T1 class or type
|
||
|
/// \tparam T2 class or type
|
||
|
/// \param a the first value
|
||
|
/// \param b the second value
|
||
|
/// \returns the minimum value based on a comparison a and b using <tt>operator<</tt>.
|
||
|
/// \details The comparison <tt>b \< a</tt> is performed and the value returned is a's type T1.
|
||
|
template <class T1, class T2> inline const T1 UnsignedMin(const T1& a, const T2& b)
|
||
|
{
|
||
|
CRYPTOPP_COMPILE_ASSERT((sizeof(T1)<=sizeof(T2) && T2(-1)>0) || (sizeof(T1)>sizeof(T2) && T1(-1)>0));
|
||
|
if (sizeof(T1)<=sizeof(T2))
|
||
|
return b < (T2)a ? (T1)b : a;
|
||
|
else
|
||
|
return (T1)b < a ? (T1)b : a;
|
||
|
}
|
||
|
|
||
|
/// \brief Tests whether a conversion from -> to is safe to perform
|
||
|
/// \tparam T1 class or type
|
||
|
/// \tparam T2 class or type
|
||
|
/// \param from the first value
|
||
|
/// \param to the second value
|
||
|
/// \returns true if its safe to convert from into to, false otherwise.
|
||
|
template <class T1, class T2>
|
||
|
inline bool SafeConvert(T1 from, T2 &to)
|
||
|
{
|
||
|
to = static_cast<T2>(from);
|
||
|
if (from != to || (from > 0) != (to > 0))
|
||
|
return false;
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
/// \brief Converts a value to a string
|
||
|
/// \tparam T class or type
|
||
|
/// \param value the value to convert
|
||
|
/// \param base the base to use during the conversion
|
||
|
/// \returns the string representation of value in base.
|
||
|
template <class T>
|
||
|
std::string IntToString(T value, unsigned int base = 10)
|
||
|
{
|
||
|
// Hack... set the high bit for uppercase.
|
||
|
const unsigned int HIGH_BIT = (1U << 31);
|
||
|
const char CH = !!(base & HIGH_BIT) ? 'A' : 'a';
|
||
|
base &= ~HIGH_BIT;
|
||
|
|
||
|
CRYPTOPP_ASSERT(base >= 2);
|
||
|
if (value == 0)
|
||
|
return "0";
|
||
|
|
||
|
bool negate = false;
|
||
|
if (value < 0)
|
||
|
{
|
||
|
negate = true;
|
||
|
value = 0-value; // VC .NET does not like -a
|
||
|
}
|
||
|
std::string result;
|
||
|
while (value > 0)
|
||
|
{
|
||
|
T digit = value % base;
|
||
|
result = char((digit < 10 ? '0' : (CH - 10)) + digit) + result;
|
||
|
value /= base;
|
||
|
}
|
||
|
if (negate)
|
||
|
result = "-" + result;
|
||
|
return result;
|
||
|
}
|
||
|
|
||
|
/// \brief Converts an unsigned value to a string
|
||
|
/// \param value the value to convert
|
||
|
/// \param base the base to use during the conversion
|
||
|
/// \returns the string representation of value in base.
|
||
|
/// \details this template function specialization was added to suppress
|
||
|
/// Coverity findings on IntToString() with unsigned types.
|
||
|
template <> CRYPTOPP_DLL
|
||
|
std::string IntToString<word64>(word64 value, unsigned int base);
|
||
|
|
||
|
/// \brief Converts an Integer to a string
|
||
|
/// \param value the Integer to convert
|
||
|
/// \param base the base to use during the conversion
|
||
|
/// \returns the string representation of value in base.
|
||
|
/// \details This is a template specialization of IntToString(). Use it
|
||
|
/// like IntToString():
|
||
|
/// <pre>
|
||
|
/// // Print integer in base 10
|
||
|
/// Integer n...
|
||
|
/// std::string s = IntToString(n, 10);
|
||
|
/// </pre>
|
||
|
/// \details The string is presented with lowercase letters by default. A
|
||
|
/// hack is available to switch to uppercase letters without modifying
|
||
|
/// the function signature.
|
||
|
/// <pre>
|
||
|
/// // Print integer in base 16, uppercase letters
|
||
|
/// Integer n...
|
||
|
/// const unsigned int UPPER = (1 << 31);
|
||
|
/// std::string s = IntToString(n, (UPPER | 16));</pre>
|
||
|
template <> CRYPTOPP_DLL
|
||
|
std::string IntToString<Integer>(Integer value, unsigned int base);
|
||
|
|
||
|
#if CRYPTOPP_MSC_VERSION
|
||
|
# pragma warning(pop)
|
||
|
#endif
|
||
|
|
||
|
#if CRYPTOPP_GCC_DIAGNOSTIC_AVAILABLE
|
||
|
# pragma GCC diagnostic pop
|
||
|
#endif
|
||
|
|
||
|
#define RETURN_IF_NONZERO(x) size_t returnedValue = x; if (returnedValue) return returnedValue
|
||
|
|
||
|
// this version of the macro is fastest on Pentium 3 and Pentium 4 with MSVC 6 SP5 w/ Processor Pack
|
||
|
#define GETBYTE(x, y) (unsigned int)byte((x)>>(8*(y)))
|
||
|
// these may be faster on other CPUs/compilers
|
||
|
// #define GETBYTE(x, y) (unsigned int)(((x)>>(8*(y)))&255)
|
||
|
// #define GETBYTE(x, y) (((byte *)&(x))[y])
|
||
|
|
||
|
#define CRYPTOPP_GET_BYTE_AS_BYTE(x, y) byte((x)>>(8*(y)))
|
||
|
|
||
|
/// \brief Returns the parity of a value
|
||
|
/// \tparam T class or type
|
||
|
/// \param value the value to provide the parity
|
||
|
/// \returns 1 if the number 1-bits in the value is odd, 0 otherwise
|
||
|
template <class T>
|
||
|
unsigned int Parity(T value)
|
||
|
{
|
||
|
for (unsigned int i=8*sizeof(value)/2; i>0; i/=2)
|
||
|
value ^= value >> i;
|
||
|
return (unsigned int)value&1;
|
||
|
}
|
||
|
|
||
|
/// \brief Returns the number of 8-bit bytes or octets required for a value
|
||
|
/// \tparam T class or type
|
||
|
/// \param value the value to test
|
||
|
/// \returns the minimum number of 8-bit bytes or octets required to represent a value
|
||
|
template <class T>
|
||
|
unsigned int BytePrecision(const T &value)
|
||
|
{
|
||
|
if (!value)
|
||
|
return 0;
|
||
|
|
||
|
unsigned int l=0, h=8*sizeof(value);
|
||
|
while (h-l > 8)
|
||
|
{
|
||
|
unsigned int t = (l+h)/2;
|
||
|
if (value >> t)
|
||
|
l = t;
|
||
|
else
|
||
|
h = t;
|
||
|
}
|
||
|
|
||
|
return h/8;
|
||
|
}
|
||
|
|
||
|
/// \brief Returns the number of bits required for a value
|
||
|
/// \tparam T class or type
|
||
|
/// \param value the value to test
|
||
|
/// \returns the maximum number of bits required to represent a value.
|
||
|
template <class T>
|
||
|
unsigned int BitPrecision(const T &value)
|
||
|
{
|
||
|
if (!value)
|
||
|
return 0;
|
||
|
|
||
|
unsigned int l=0, h=8*sizeof(value);
|
||
|
|
||
|
while (h-l > 1)
|
||
|
{
|
||
|
unsigned int t = (l+h)/2;
|
||
|
if (value >> t)
|
||
|
l = t;
|
||
|
else
|
||
|
h = t;
|
||
|
}
|
||
|
|
||
|
return h;
|
||
|
}
|
||
|
|
||
|
/// Determines the number of trailing 0-bits in a value
|
||
|
/// \param v the 32-bit value to test
|
||
|
/// \returns the number of trailing 0-bits in v, starting at the least significant bit position
|
||
|
/// \details TrailingZeros returns the number of trailing 0-bits in v, starting at the least
|
||
|
/// significant bit position. The return value is undefined if there are no 1-bits set in the value v.
|
||
|
/// \note The function does not return 0 if no 1-bits are set because 0 collides with a 1-bit at the 0-th position.
|
||
|
inline unsigned int TrailingZeros(word32 v)
|
||
|
{
|
||
|
// GCC 4.7 and VS2012 provides tzcnt on AVX2/BMI enabled processors
|
||
|
// We don't enable for Microsoft because it requires a runtime check.
|
||
|
// http://msdn.microsoft.com/en-us/library/hh977023%28v=vs.110%29.aspx
|
||
|
CRYPTOPP_ASSERT(v != 0);
|
||
|
#if defined(__BMI__)
|
||
|
return (unsigned int)_tzcnt_u32(v);
|
||
|
#elif defined(__GNUC__) && (CRYPTOPP_GCC_VERSION >= 30400)
|
||
|
return (unsigned int)__builtin_ctz(v);
|
||
|
#elif defined(_MSC_VER) && (_MSC_VER >= 1400)
|
||
|
unsigned long result;
|
||
|
_BitScanForward(&result, v);
|
||
|
return static_cast<unsigned int>(result);
|
||
|
#else
|
||
|
// from http://graphics.stanford.edu/~seander/bithacks.html#ZerosOnRightMultLookup
|
||
|
static const int MultiplyDeBruijnBitPosition[32] =
|
||
|
{
|
||
|
0, 1, 28, 2, 29, 14, 24, 3, 30, 22, 20, 15, 25, 17, 4, 8,
|
||
|
31, 27, 13, 23, 21, 19, 16, 7, 26, 12, 18, 6, 11, 5, 10, 9
|
||
|
};
|
||
|
return MultiplyDeBruijnBitPosition[((word32)((v & -v) * 0x077CB531U)) >> 27];
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
/// Determines the number of trailing 0-bits in a value
|
||
|
/// \param v the 64-bit value to test
|
||
|
/// \returns the number of trailing 0-bits in v, starting at the least significant bit position
|
||
|
/// \details TrailingZeros returns the number of trailing 0-bits in v, starting at the least
|
||
|
/// significant bit position. The return value is undefined if there are no 1-bits set in the value v.
|
||
|
/// \note The function does not return 0 if no 1-bits are set because 0 collides with a 1-bit at the 0-th position.
|
||
|
inline unsigned int TrailingZeros(word64 v)
|
||
|
{
|
||
|
// GCC 4.7 and VS2012 provides tzcnt on AVX2/BMI enabled processors
|
||
|
// We don't enable for Microsoft because it requires a runtime check.
|
||
|
// http://msdn.microsoft.com/en-us/library/hh977023%28v=vs.110%29.aspx
|
||
|
CRYPTOPP_ASSERT(v != 0);
|
||
|
#if defined(__BMI__) && defined(__x86_64__)
|
||
|
return (unsigned int)_tzcnt_u64(v);
|
||
|
#elif defined(__GNUC__) && (CRYPTOPP_GCC_VERSION >= 30400)
|
||
|
return (unsigned int)__builtin_ctzll(v);
|
||
|
#elif defined(_MSC_VER) && (_MSC_VER >= 1400) && (defined(_M_X64) || defined(_M_IA64))
|
||
|
unsigned long result;
|
||
|
_BitScanForward64(&result, v);
|
||
|
return static_cast<unsigned int>(result);
|
||
|
#else
|
||
|
return word32(v) ? TrailingZeros(word32(v)) : 32 + TrailingZeros(word32(v>>32));
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
/// \brief Truncates the value to the specified number of bits.
|
||
|
/// \tparam T class or type
|
||
|
/// \param value the value to truncate or mask
|
||
|
/// \param bits the number of bits to truncate or mask
|
||
|
/// \returns the value truncated to the specified number of bits, starting at the least
|
||
|
/// significant bit position
|
||
|
/// \details This function masks the low-order bits of value and returns the result. The
|
||
|
/// mask is created with <tt>(1 << bits) - 1</tt>.
|
||
|
template <class T>
|
||
|
inline T Crop(T value, size_t bits)
|
||
|
{
|
||
|
if (bits < 8*sizeof(value))
|
||
|
return T(value & ((T(1) << bits) - 1));
|
||
|
else
|
||
|
return value;
|
||
|
}
|
||
|
|
||
|
/// \brief Returns the number of 8-bit bytes or octets required for the specified number of bits
|
||
|
/// \param bitCount the number of bits
|
||
|
/// \returns the minimum number of 8-bit bytes or octets required by bitCount
|
||
|
/// \details BitsToBytes is effectively a ceiling function based on 8-bit bytes.
|
||
|
inline size_t BitsToBytes(size_t bitCount)
|
||
|
{
|
||
|
return ((bitCount+7)/(8));
|
||
|
}
|
||
|
|
||
|
/// \brief Returns the number of words required for the specified number of bytes
|
||
|
/// \param byteCount the number of bytes
|
||
|
/// \returns the minimum number of words required by byteCount
|
||
|
/// \details BytesToWords is effectively a ceiling function based on <tt>WORD_SIZE</tt>.
|
||
|
/// <tt>WORD_SIZE</tt> is defined in config.h
|
||
|
inline size_t BytesToWords(size_t byteCount)
|
||
|
{
|
||
|
return ((byteCount+WORD_SIZE-1)/WORD_SIZE);
|
||
|
}
|
||
|
|
||
|
/// \brief Returns the number of words required for the specified number of bits
|
||
|
/// \param bitCount the number of bits
|
||
|
/// \returns the minimum number of words required by bitCount
|
||
|
/// \details BitsToWords is effectively a ceiling function based on <tt>WORD_BITS</tt>.
|
||
|
/// <tt>WORD_BITS</tt> is defined in config.h
|
||
|
inline size_t BitsToWords(size_t bitCount)
|
||
|
{
|
||
|
return ((bitCount+WORD_BITS-1)/(WORD_BITS));
|
||
|
}
|
||
|
|
||
|
/// \brief Returns the number of double words required for the specified number of bits
|
||
|
/// \param bitCount the number of bits
|
||
|
/// \returns the minimum number of double words required by bitCount
|
||
|
/// \details BitsToDwords is effectively a ceiling function based on <tt>2*WORD_BITS</tt>.
|
||
|
/// <tt>WORD_BITS</tt> is defined in config.h
|
||
|
inline size_t BitsToDwords(size_t bitCount)
|
||
|
{
|
||
|
return ((bitCount+2*WORD_BITS-1)/(2*WORD_BITS));
|
||
|
}
|
||
|
|
||
|
/// Performs an XOR of a buffer with a mask
|
||
|
/// \param buf the buffer to XOR with the mask
|
||
|
/// \param mask the mask to XOR with the buffer
|
||
|
/// \param count the size of the buffers, in bytes
|
||
|
/// \details The function effectively visits each element in the buffers and performs
|
||
|
/// <tt>buf[i] ^= mask[i]</tt>. buf and mask must be of equal size.
|
||
|
CRYPTOPP_DLL void CRYPTOPP_API xorbuf(byte *buf, const byte *mask, size_t count);
|
||
|
|
||
|
/// Performs an XOR of an input buffer with a mask and stores the result in an output buffer
|
||
|
/// \param output the destination buffer
|
||
|
/// \param input the source buffer to XOR with the mask
|
||
|
/// \param mask the mask buffer to XOR with the input buffer
|
||
|
/// \param count the size of the buffers, in bytes
|
||
|
/// \details The function effectively visits each element in the buffers and performs
|
||
|
/// <tt>output[i] = input[i] ^ mask[i]</tt>. output, input and mask must be of equal size.
|
||
|
CRYPTOPP_DLL void CRYPTOPP_API xorbuf(byte *output, const byte *input, const byte *mask, size_t count);
|
||
|
|
||
|
/// \brief Performs a near constant-time comparison of two equally sized buffers
|
||
|
/// \param buf1 the first buffer
|
||
|
/// \param buf2 the second buffer
|
||
|
/// \param count the size of the buffers, in bytes
|
||
|
/// \details VerifyBufsEqual performs an XOR of the elements in two equally sized
|
||
|
/// buffers and retruns a result based on the XOR operation. A count of 0 returns
|
||
|
/// true because two empty buffers are considered equal.
|
||
|
/// \details The function is near constant-time because CPU micro-code timings could
|
||
|
/// affect the "constant-ness". Calling code is responsible for mitigating timing
|
||
|
/// attacks if the buffers are not equally sized.
|
||
|
/// \sa ModPowerOf2
|
||
|
CRYPTOPP_DLL bool CRYPTOPP_API VerifyBufsEqual(const byte *buf1, const byte *buf2, size_t count);
|
||
|
|
||
|
/// \brief Tests whether a value is a power of 2
|
||
|
/// \param value the value to test
|
||
|
/// \returns true if value is a power of 2, false otherwise
|
||
|
/// \details The function creates a mask of <tt>value - 1</tt> and returns the result
|
||
|
/// of an AND operation compared to 0. If value is 0 or less than 0, then the function
|
||
|
/// returns false.
|
||
|
template <class T>
|
||
|
inline bool IsPowerOf2(const T &value)
|
||
|
{
|
||
|
return value > 0 && (value & (value-1)) == 0;
|
||
|
}
|
||
|
|
||
|
#if defined(__BMI__)
|
||
|
template <>
|
||
|
inline bool IsPowerOf2<word32>(const word32 &value)
|
||
|
{
|
||
|
return value > 0 && _blsr_u32(value) == 0;
|
||
|
}
|
||
|
|
||
|
# if defined(__x86_64__)
|
||
|
template <>
|
||
|
inline bool IsPowerOf2<word64>(const word64 &value)
|
||
|
{
|
||
|
return value > 0 && _blsr_u64(value) == 0;
|
||
|
}
|
||
|
# endif // __x86_64__
|
||
|
#endif // __BMI__
|
||
|
|
||
|
/// \brief Provide the minimum value for a type
|
||
|
/// \tparam T type of class
|
||
|
/// \returns the minimum value of the type or class
|
||
|
/// \details NumericLimitsMin() was introduced for Clang at <A
|
||
|
/// HREF="http://github.com/weidai11/cryptopp/issues/364">Issue 364,
|
||
|
/// Apple Clang 6.0 and numeric_limits<word128>::max() returns 0</A>.
|
||
|
/// \details NumericLimitsMin() requires a specialization for <tt>T</tt>,
|
||
|
/// meaning <tt>std::numeric_limits<T>::is_specialized</tt> must return
|
||
|
/// <tt>true</tt>. In the case of <tt>word128</tt> Clang did not specialize
|
||
|
/// <tt>numeric_limits</tt> for the type.
|
||
|
/// \since Crypto++ 8.1
|
||
|
template<class T>
|
||
|
inline T NumericLimitsMin()
|
||
|
{
|
||
|
CRYPTOPP_ASSERT(std::numeric_limits<T>::is_specialized);
|
||
|
return (std::numeric_limits<T>::min)();
|
||
|
}
|
||
|
|
||
|
/// \brief Provide the maximum value for a type
|
||
|
/// \tparam T type of class
|
||
|
/// \returns the maximum value of the type or class
|
||
|
/// \details NumericLimitsMax() was introduced for Clang at <A
|
||
|
/// HREF="http://github.com/weidai11/cryptopp/issues/364">Issue 364,
|
||
|
/// Apple Clang 6.0 and numeric_limits<word128>::max() returns 0</A>.
|
||
|
/// \details NumericLimitsMax() requires a specialization for <tt>T</tt>,
|
||
|
/// meaning <tt>std::numeric_limits<T>::is_specialized</tt> must return
|
||
|
/// <tt>true</tt>. In the case of <tt>word128</tt> Clang did not specialize
|
||
|
/// <tt>numeric_limits</tt> for the type.
|
||
|
/// \since Crypto++ 8.1
|
||
|
template<class T>
|
||
|
inline T NumericLimitsMax()
|
||
|
{
|
||
|
CRYPTOPP_ASSERT(std::numeric_limits<T>::is_specialized);
|
||
|
return (std::numeric_limits<T>::max)();
|
||
|
}
|
||
|
|
||
|
// NumericLimitsMin and NumericLimitsMax added for word128 types,
|
||
|
// see http://github.com/weidai11/cryptopp/issues/364
|
||
|
#if defined(CRYPTOPP_WORD128_AVAILABLE)
|
||
|
template<>
|
||
|
inline word128 NumericLimitsMin()
|
||
|
{
|
||
|
return 0;
|
||
|
}
|
||
|
template<>
|
||
|
inline word128 NumericLimitsMax()
|
||
|
{
|
||
|
return (static_cast<word128>(LWORD_MAX) << 64U) | LWORD_MAX;
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
/// \brief Performs a saturating subtract clamped at 0
|
||
|
/// \tparam T1 class or type
|
||
|
/// \tparam T2 class or type
|
||
|
/// \param a the minuend
|
||
|
/// \param b the subtrahend
|
||
|
/// \returns the difference produced by the saturating subtract
|
||
|
/// \details Saturating arithmetic restricts results to a fixed range. Results that are
|
||
|
/// less than 0 are clamped at 0.
|
||
|
/// \details Use of saturating arithmetic in places can be advantageous because it can
|
||
|
/// avoid a branch by using an instruction like a conditional move (<tt>CMOVE</tt>).
|
||
|
template <class T1, class T2>
|
||
|
inline T1 SaturatingSubtract(const T1 &a, const T2 &b)
|
||
|
{
|
||
|
// Generated ASM of a typical clamp, http://gcc.gnu.org/ml/gcc-help/2014-10/msg00112.html
|
||
|
return T1((a > b) ? (a - b) : 0);
|
||
|
}
|
||
|
|
||
|
/// \brief Performs a saturating subtract clamped at 1
|
||
|
/// \tparam T1 class or type
|
||
|
/// \tparam T2 class or type
|
||
|
/// \param a the minuend
|
||
|
/// \param b the subtrahend
|
||
|
/// \returns the difference produced by the saturating subtract
|
||
|
/// \details Saturating arithmetic restricts results to a fixed range. Results that are
|
||
|
/// less than 1 are clamped at 1.
|
||
|
/// \details Use of saturating arithmetic in places can be advantageous because it can
|
||
|
/// avoid a branch by using an instruction like a conditional move (<tt>CMOVE</tt>).
|
||
|
template <class T1, class T2>
|
||
|
inline T1 SaturatingSubtract1(const T1 &a, const T2 &b)
|
||
|
{
|
||
|
// Generated ASM of a typical clamp, http://gcc.gnu.org/ml/gcc-help/2014-10/msg00112.html
|
||
|
return T1((a > b) ? (a - b) : 1);
|
||
|
}
|
||
|
|
||
|
/// \brief Reduces a value to a power of 2
|
||
|
/// \tparam T1 class or type
|
||
|
/// \tparam T2 class or type
|
||
|
/// \param a the first value
|
||
|
/// \param b the second value
|
||
|
/// \returns ModPowerOf2() returns <tt>a & (b-1)</tt>. <tt>b</tt> must be a power of 2.
|
||
|
/// Use IsPowerOf2() to determine if <tt>b</tt> is a suitable candidate.
|
||
|
/// \sa IsPowerOf2
|
||
|
template <class T1, class T2>
|
||
|
inline T2 ModPowerOf2(const T1 &a, const T2 &b)
|
||
|
{
|
||
|
CRYPTOPP_ASSERT(IsPowerOf2(b));
|
||
|
// Coverity finding CID 170383 Overflowed return value (INTEGER_OVERFLOW)
|
||
|
return T2(a) & SaturatingSubtract(b,1U);
|
||
|
}
|
||
|
|
||
|
/// \brief Rounds a value down to a multiple of a second value
|
||
|
/// \tparam T1 class or type
|
||
|
/// \tparam T2 class or type
|
||
|
/// \param n the value to reduce
|
||
|
/// \param m the value to reduce \n to to a multiple
|
||
|
/// \returns the possibly unmodified value \n
|
||
|
/// \details RoundDownToMultipleOf is effectively a floor function based on m. The function returns
|
||
|
/// the value <tt>n - n\%m</tt>. If n is a multiple of m, then the original value is returned.
|
||
|
/// \note <tt>T1</tt> and <tt>T2</tt> should be usigned arithmetic types. If <tt>T1</tt> or
|
||
|
/// <tt>T2</tt> is signed, then the value should be non-negative. The library asserts in
|
||
|
/// debug builds when practical, but allows you to perform the operation in release builds.
|
||
|
template <class T1, class T2>
|
||
|
inline T1 RoundDownToMultipleOf(const T1 &n, const T2 &m)
|
||
|
{
|
||
|
// http://github.com/weidai11/cryptopp/issues/364
|
||
|
#if !defined(CRYPTOPP_APPLE_CLANG_VERSION) || (CRYPTOPP_APPLE_CLANG_VERSION >= 80000)
|
||
|
CRYPTOPP_ASSERT(std::numeric_limits<T1>::is_integer);
|
||
|
CRYPTOPP_ASSERT(std::numeric_limits<T2>::is_integer);
|
||
|
#endif
|
||
|
|
||
|
CRYPTOPP_ASSERT(!std::numeric_limits<T1>::is_signed || n > 0);
|
||
|
CRYPTOPP_ASSERT(!std::numeric_limits<T2>::is_signed || m > 0);
|
||
|
|
||
|
if (IsPowerOf2(m))
|
||
|
return n - ModPowerOf2(n, m);
|
||
|
else
|
||
|
return n - n%m;
|
||
|
}
|
||
|
|
||
|
/// \brief Rounds a value up to a multiple of a second value
|
||
|
/// \tparam T1 class or type
|
||
|
/// \tparam T2 class or type
|
||
|
/// \param n the value to reduce
|
||
|
/// \param m the value to reduce \n to to a multiple
|
||
|
/// \returns the possibly unmodified value \n
|
||
|
/// \details RoundUpToMultipleOf is effectively a ceiling function based on m. The function
|
||
|
/// returns the value <tt>n + n\%m</tt>. If n is a multiple of m, then the original value is
|
||
|
/// returned. If the value n would overflow, then an InvalidArgument exception is thrown.
|
||
|
/// \note <tt>T1</tt> and <tt>T2</tt> should be usigned arithmetic types. If <tt>T1</tt> or
|
||
|
/// <tt>T2</tt> is signed, then the value should be non-negative. The library asserts in
|
||
|
/// debug builds when practical, but allows you to perform the operation in release builds.
|
||
|
template <class T1, class T2>
|
||
|
inline T1 RoundUpToMultipleOf(const T1 &n, const T2 &m)
|
||
|
{
|
||
|
// http://github.com/weidai11/cryptopp/issues/364
|
||
|
#if !defined(CRYPTOPP_APPLE_CLANG_VERSION) || (CRYPTOPP_APPLE_CLANG_VERSION >= 80000)
|
||
|
CRYPTOPP_ASSERT(std::numeric_limits<T1>::is_integer);
|
||
|
CRYPTOPP_ASSERT(std::numeric_limits<T2>::is_integer);
|
||
|
#endif
|
||
|
|
||
|
CRYPTOPP_ASSERT(!std::numeric_limits<T1>::is_signed || n > 0);
|
||
|
CRYPTOPP_ASSERT(!std::numeric_limits<T2>::is_signed || m > 0);
|
||
|
|
||
|
if (NumericLimitsMax<T1>() - m + 1 < n)
|
||
|
throw InvalidArgument("RoundUpToMultipleOf: integer overflow");
|
||
|
return RoundDownToMultipleOf(T1(n+m-1), m);
|
||
|
}
|
||
|
|
||
|
/// \brief Returns the minimum alignment requirements of a type
|
||
|
/// \tparam T class or type
|
||
|
/// \returns the minimum alignment requirements of <tt>T</tt>, in bytes
|
||
|
/// \details Internally the function calls C++11's <tt>alignof</tt> if available. If not
|
||
|
/// available, then the function uses compiler specific extensions such as
|
||
|
/// <tt>__alignof</tt> and <tt>_alignof_</tt>. If an extension is not available, then
|
||
|
/// the function uses <tt>__BIGGEST_ALIGNMENT__</tt> if <tt>__BIGGEST_ALIGNMENT__</tt>
|
||
|
/// is smaller than <tt>sizeof(T)</tt>. <tt>sizeof(T)</tt> is used if all others are
|
||
|
/// not available.
|
||
|
template <class T>
|
||
|
inline unsigned int GetAlignmentOf()
|
||
|
{
|
||
|
#if defined(CRYPTOPP_CXX11_ALIGNOF)
|
||
|
return alignof(T);
|
||
|
#elif (_MSC_VER >= 1300)
|
||
|
return __alignof(T);
|
||
|
#elif defined(__GNUC__)
|
||
|
return __alignof__(T);
|
||
|
#elif defined(__SUNPRO_CC)
|
||
|
return __alignof__(T);
|
||
|
#elif defined(__IBM_ALIGNOF__)
|
||
|
return __alignof__(T);
|
||
|
#elif CRYPTOPP_BOOL_SLOW_WORD64
|
||
|
return UnsignedMin(4U, sizeof(T));
|
||
|
#else
|
||
|
return sizeof(T);
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
/// \brief Determines whether ptr is aligned to a minimum value
|
||
|
/// \param ptr the pointer being checked for alignment
|
||
|
/// \param alignment the alignment value to test the pointer against
|
||
|
/// \returns true if <tt>ptr</tt> is aligned on at least <tt>alignment</tt>
|
||
|
/// boundary, false otherwise
|
||
|
/// \details Internally the function tests whether alignment is 1. If so,
|
||
|
/// the function returns true. If not, then the function effectively
|
||
|
/// performs a modular reduction and returns true if the residue is 0.
|
||
|
inline bool IsAlignedOn(const void *ptr, unsigned int alignment)
|
||
|
{
|
||
|
const uintptr_t x = reinterpret_cast<uintptr_t>(ptr);
|
||
|
return alignment==1 || (IsPowerOf2(alignment) ? ModPowerOf2(x, alignment) == 0 : x % alignment == 0);
|
||
|
}
|
||
|
|
||
|
/// \brief Determines whether ptr is minimally aligned
|
||
|
/// \tparam T class or type
|
||
|
/// \param ptr the pointer to check for alignment
|
||
|
/// \returns true if <tt>ptr</tt> is aligned to at least <tt>T</tt>
|
||
|
/// boundary, false otherwise
|
||
|
/// \details Internally the function calls IsAlignedOn with a second
|
||
|
/// parameter of GetAlignmentOf<T>.
|
||
|
template <class T>
|
||
|
inline bool IsAligned(const void *ptr)
|
||
|
{
|
||
|
return IsAlignedOn(ptr, GetAlignmentOf<T>());
|
||
|
}
|
||
|
|
||
|
#if (CRYPTOPP_LITTLE_ENDIAN)
|
||
|
typedef LittleEndian NativeByteOrder;
|
||
|
#elif (CRYPTOPP_BIG_ENDIAN)
|
||
|
typedef BigEndian NativeByteOrder;
|
||
|
#else
|
||
|
# error "Unable to determine endianness"
|
||
|
#endif
|
||
|
|
||
|
/// \brief Returns NativeByteOrder as an enumerated ByteOrder value
|
||
|
/// \returns LittleEndian if the native byte order is little-endian,
|
||
|
/// and BigEndian if the native byte order is big-endian
|
||
|
/// \details NativeByteOrder is a typedef depending on the platform.
|
||
|
/// If CRYPTOPP_LITTLE_ENDIAN is set in config.h, then
|
||
|
/// GetNativeByteOrder returns LittleEndian. If CRYPTOPP_BIG_ENDIAN
|
||
|
/// is set, then GetNativeByteOrder returns BigEndian.
|
||
|
/// \note There are other byte orders besides little- and big-endian,
|
||
|
/// and they include bi-endian and PDP-endian. If a system is neither
|
||
|
/// little-endian nor big-endian, then a compile time error occurs.
|
||
|
inline ByteOrder GetNativeByteOrder()
|
||
|
{
|
||
|
return NativeByteOrder::ToEnum();
|
||
|
}
|
||
|
|
||
|
/// \brief Determines whether order follows native byte ordering
|
||
|
/// \param order the ordering being tested against native byte ordering
|
||
|
/// \returns true if order follows native byte ordering, false otherwise
|
||
|
inline bool NativeByteOrderIs(ByteOrder order)
|
||
|
{
|
||
|
return order == GetNativeByteOrder();
|
||
|
}
|
||
|
|
||
|
/// \brief Returns the direction the cipher is being operated
|
||
|
/// \tparam T class or type
|
||
|
/// \param obj the cipher object being queried
|
||
|
/// \returns ENCRYPTION if the cipher obj is being operated in its forward direction,
|
||
|
/// DECRYPTION otherwise
|
||
|
/// \details A cipher can be operated in a "forward" direction (encryption) or a "reverse"
|
||
|
/// direction (decryption). The operations do not have to be symmetric, meaning a second
|
||
|
/// application of the transformation does not necessariy return the original message.
|
||
|
/// That is, <tt>E(D(m))</tt> may not equal <tt>E(E(m))</tt>; and <tt>D(E(m))</tt> may not
|
||
|
/// equal <tt>D(D(m))</tt>.
|
||
|
template <class T>
|
||
|
inline CipherDir GetCipherDir(const T &obj)
|
||
|
{
|
||
|
return obj.IsForwardTransformation() ? ENCRYPTION : DECRYPTION;
|
||
|
}
|
||
|
|
||
|
/// \brief Performs an addition with carry on a block of bytes
|
||
|
/// \param inout the byte block
|
||
|
/// \param size the size of the block, in bytes
|
||
|
/// \details Performs an addition with carry by adding 1 on a block of bytes starting at the least
|
||
|
/// significant byte. Once carry is 0, the function terminates and returns to the caller.
|
||
|
/// \note The function is not constant time because it stops processing when the carry is 0.
|
||
|
inline void IncrementCounterByOne(byte *inout, unsigned int size)
|
||
|
{
|
||
|
CRYPTOPP_ASSERT(inout != NULLPTR);
|
||
|
|
||
|
unsigned int carry=1;
|
||
|
while (carry && size != 0)
|
||
|
{
|
||
|
// On carry inout[n] equals 0
|
||
|
carry = ! ++inout[size-1];
|
||
|
size--;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/// \brief Performs an addition with carry on a block of bytes
|
||
|
/// \param output the destination block of bytes
|
||
|
/// \param input the source block of bytes
|
||
|
/// \param size the size of the block
|
||
|
/// \details Performs an addition with carry on a block of bytes starting at the least significant
|
||
|
/// byte. Once carry is 0, the remaining bytes from input are copied to output using memcpy.
|
||
|
/// \details The function is close to near-constant time because it operates on all the bytes in the blocks.
|
||
|
inline void IncrementCounterByOne(byte *output, const byte *input, unsigned int size)
|
||
|
{
|
||
|
CRYPTOPP_ASSERT(output != NULLPTR);
|
||
|
CRYPTOPP_ASSERT(input != NULLPTR);
|
||
|
|
||
|
unsigned int carry=1;
|
||
|
while (carry && size != 0)
|
||
|
{
|
||
|
// On carry output[n] equals 0
|
||
|
carry = ! (output[size-1] = input[size-1] + 1);
|
||
|
size--;
|
||
|
}
|
||
|
|
||
|
while (size != 0)
|
||
|
{
|
||
|
output[size-1] = input[size-1];
|
||
|
size--;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/// \brief Performs a branchless swap of values a and b if condition c is true
|
||
|
/// \tparam T class or type
|
||
|
/// \param c the condition to perform the swap
|
||
|
/// \param a the first value
|
||
|
/// \param b the second value
|
||
|
template <class T>
|
||
|
inline void ConditionalSwap(bool c, T &a, T &b)
|
||
|
{
|
||
|
T t = c * (a ^ b);
|
||
|
a ^= t;
|
||
|
b ^= t;
|
||
|
}
|
||
|
|
||
|
/// \brief Performs a branchless swap of pointers a and b if condition c is true
|
||
|
/// \tparam T class or type
|
||
|
/// \param c the condition to perform the swap
|
||
|
/// \param a the first pointer
|
||
|
/// \param b the second pointer
|
||
|
template <class T>
|
||
|
inline void ConditionalSwapPointers(bool c, T &a, T &b)
|
||
|
{
|
||
|
ptrdiff_t t = size_t(c) * (a - b);
|
||
|
a -= t;
|
||
|
b += t;
|
||
|
}
|
||
|
|
||
|
// see http://www.dwheeler.com/secure-programs/Secure-Programs-HOWTO/protect-secrets.html
|
||
|
// and http://www.securecoding.cert.org/confluence/display/cplusplus/MSC06-CPP.+Be+aware+of+compiler+optimization+when+dealing+with+sensitive+data
|
||
|
|
||
|
/// \brief Sets each element of an array to 0
|
||
|
/// \tparam T class or type
|
||
|
/// \param buf an array of elements
|
||
|
/// \param n the number of elements in the array
|
||
|
/// \details The operation performs a wipe or zeroization. The function
|
||
|
/// attempts to survive optimizations and dead code removal.
|
||
|
template <class T>
|
||
|
void SecureWipeBuffer(T *buf, size_t n)
|
||
|
{
|
||
|
// GCC 4.3.2 on Cygwin optimizes away the first store if this
|
||
|
// loop is done in the forward direction
|
||
|
volatile T *p = buf+n;
|
||
|
while (n--)
|
||
|
*(--p) = 0;
|
||
|
}
|
||
|
|
||
|
#if !defined(CRYPTOPP_DISABLE_ASM) && \
|
||
|
(_MSC_VER >= 1400 || defined(__GNUC__)) && \
|
||
|
(CRYPTOPP_BOOL_X64 || CRYPTOPP_BOOL_X86)
|
||
|
|
||
|
/// \brief Sets each byte of an array to 0
|
||
|
/// \param buf an array of bytes
|
||
|
/// \param n the number of elements in the array
|
||
|
/// \details The operation performs a wipe or zeroization. The function
|
||
|
/// attempts to survive optimizations and dead code removal.
|
||
|
template<> inline void SecureWipeBuffer(byte *buf, size_t n)
|
||
|
{
|
||
|
volatile byte *p = buf;
|
||
|
#ifdef __GNUC__
|
||
|
asm volatile("rep stosb" : "+c"(n), "+D"(p) : "a"(0) : "memory");
|
||
|
#else
|
||
|
__stosb(reinterpret_cast<byte *>(reinterpret_cast<size_t>(p)), 0, n);
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
/// \brief Sets each 16-bit element of an array to 0
|
||
|
/// \param buf an array of 16-bit words
|
||
|
/// \param n the number of elements in the array
|
||
|
/// \details The operation performs a wipe or zeroization. The function
|
||
|
/// attempts to survive optimizations and dead code removal.
|
||
|
template<> inline void SecureWipeBuffer(word16 *buf, size_t n)
|
||
|
{
|
||
|
volatile word16 *p = buf;
|
||
|
#ifdef __GNUC__
|
||
|
asm volatile("rep stosw" : "+c"(n), "+D"(p) : "a"(0) : "memory");
|
||
|
#else
|
||
|
__stosw(reinterpret_cast<word16 *>(reinterpret_cast<size_t>(p)), 0, n);
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
/// \brief Sets each 32-bit element of an array to 0
|
||
|
/// \param buf an array of 32-bit words
|
||
|
/// \param n the number of elements in the array
|
||
|
/// \details The operation performs a wipe or zeroization. The function
|
||
|
/// attempts to survive optimizations and dead code removal.
|
||
|
template<> inline void SecureWipeBuffer(word32 *buf, size_t n)
|
||
|
{
|
||
|
volatile word32 *p = buf;
|
||
|
#ifdef __GNUC__
|
||
|
asm volatile("rep stosl" : "+c"(n), "+D"(p) : "a"(0) : "memory");
|
||
|
#else
|
||
|
__stosd(reinterpret_cast<unsigned long *>(reinterpret_cast<size_t>(p)), 0, n);
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
/// \brief Sets each 64-bit element of an array to 0
|
||
|
/// \param buf an array of 64-bit words
|
||
|
/// \param n the number of elements in the array
|
||
|
/// \details The operation performs a wipe or zeroization. The function
|
||
|
/// attempts to survive optimizations and dead code removal.
|
||
|
template<> inline void SecureWipeBuffer(word64 *buf, size_t n)
|
||
|
{
|
||
|
#if CRYPTOPP_BOOL_X64
|
||
|
volatile word64 *p = buf;
|
||
|
# ifdef __GNUC__
|
||
|
asm volatile("rep stosq" : "+c"(n), "+D"(p) : "a"(0) : "memory");
|
||
|
# else
|
||
|
__stosq(const_cast<word64 *>(p), 0, n);
|
||
|
# endif
|
||
|
#else
|
||
|
SecureWipeBuffer(reinterpret_cast<word32 *>(buf), 2*n);
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
#endif // CRYPTOPP_BOOL_X64 || CRYPTOPP_BOOL_X86
|
||
|
|
||
|
#if !defined(CRYPTOPP_DISABLE_ASM) && (_MSC_VER >= 1700) && defined(_M_ARM)
|
||
|
template<> inline void SecureWipeBuffer(byte *buf, size_t n)
|
||
|
{
|
||
|
char *p = reinterpret_cast<char*>(buf+n);
|
||
|
while (n--)
|
||
|
__iso_volatile_store8(--p, 0);
|
||
|
}
|
||
|
|
||
|
template<> inline void SecureWipeBuffer(word16 *buf, size_t n)
|
||
|
{
|
||
|
short *p = reinterpret_cast<short*>(buf+n);
|
||
|
while (n--)
|
||
|
__iso_volatile_store16(--p, 0);
|
||
|
}
|
||
|
|
||
|
template<> inline void SecureWipeBuffer(word32 *buf, size_t n)
|
||
|
{
|
||
|
int *p = reinterpret_cast<int*>(buf+n);
|
||
|
while (n--)
|
||
|
__iso_volatile_store32(--p, 0);
|
||
|
}
|
||
|
|
||
|
template<> inline void SecureWipeBuffer(word64 *buf, size_t n)
|
||
|
{
|
||
|
__int64 *p = reinterpret_cast<__int64*>(buf+n);
|
||
|
while (n--)
|
||
|
__iso_volatile_store64(--p, 0);
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
/// \brief Sets each element of an array to 0
|
||
|
/// \tparam T class or type
|
||
|
/// \param buf an array of elements
|
||
|
/// \param n the number of elements in the array
|
||
|
/// \details The operation performs a wipe or zeroization. The function
|
||
|
/// attempts to survive optimizations and dead code removal.
|
||
|
template <class T>
|
||
|
inline void SecureWipeArray(T *buf, size_t n)
|
||
|
{
|
||
|
if (sizeof(T) % 8 == 0 && GetAlignmentOf<T>() % GetAlignmentOf<word64>() == 0)
|
||
|
SecureWipeBuffer(reinterpret_cast<word64 *>(static_cast<void *>(buf)), n * (sizeof(T)/8));
|
||
|
else if (sizeof(T) % 4 == 0 && GetAlignmentOf<T>() % GetAlignmentOf<word32>() == 0)
|
||
|
SecureWipeBuffer(reinterpret_cast<word32 *>(static_cast<void *>(buf)), n * (sizeof(T)/4));
|
||
|
else if (sizeof(T) % 2 == 0 && GetAlignmentOf<T>() % GetAlignmentOf<word16>() == 0)
|
||
|
SecureWipeBuffer(reinterpret_cast<word16 *>(static_cast<void *>(buf)), n * (sizeof(T)/2));
|
||
|
else
|
||
|
SecureWipeBuffer(reinterpret_cast<byte *>(static_cast<void *>(buf)), n * sizeof(T));
|
||
|
}
|
||
|
|
||
|
/// \brief Converts a wide character C-string to a multibyte string
|
||
|
/// \param str C-string consisting of wide characters
|
||
|
/// \param throwOnError flag indicating the function should throw on error
|
||
|
/// \returns str converted to a multibyte string or an empty string.
|
||
|
/// \details StringNarrow() converts a wide string to a narrow string using C++ std::wcstombs() under
|
||
|
/// the executing thread's locale. A locale must be set before using this function, and it can be
|
||
|
/// set with std::setlocale() if needed. Upon success, the converted string is returned.
|
||
|
/// \details Upon failure with throwOnError as false, the function returns an empty string. If
|
||
|
/// throwOnError as true, the function throws an InvalidArgument() exception.
|
||
|
/// \note If you try to convert, say, the Chinese character for "bone" from UTF-16 (0x9AA8) to UTF-8
|
||
|
/// (0xE9 0xAA 0xA8), then you must ensure the locale is available. If the locale is not available,
|
||
|
/// then a 0x21 error is returned on Windows which eventually results in an InvalidArgument() exception.
|
||
|
std::string StringNarrow(const wchar_t *str, bool throwOnError = true);
|
||
|
|
||
|
/// \brief Converts a multibyte C-string to a wide character string
|
||
|
/// \param str C-string consisting of wide characters
|
||
|
/// \param throwOnError flag indicating the function should throw on error
|
||
|
/// \returns str converted to a multibyte string or an empty string.
|
||
|
/// \details StringWiden() converts a narrow string to a wide string using C++ std::mbstowcs() under
|
||
|
/// the executing thread's locale. A locale must be set before using this function, and it can be
|
||
|
/// set with std::setlocale() if needed. Upon success, the converted string is returned.
|
||
|
/// \details Upon failure with throwOnError as false, the function returns an empty string. If
|
||
|
/// throwOnError as true, the function throws an InvalidArgument() exception.
|
||
|
/// \note If you try to convert, say, the Chinese character for "bone" from UTF-8 (0xE9 0xAA 0xA8)
|
||
|
/// to UTF-16 (0x9AA8), then you must ensure the locale is available. If the locale is not available,
|
||
|
/// then a 0x21 error is returned on Windows which eventually results in an InvalidArgument() exception.
|
||
|
std::wstring StringWiden(const char *str, bool throwOnError = true);
|
||
|
|
||
|
// ************** rotate functions ***************
|
||
|
|
||
|
/// \brief Performs a left rotate
|
||
|
/// \tparam R the number of bit positions to rotate the value
|
||
|
/// \tparam T the word type
|
||
|
/// \param x the value to rotate
|
||
|
/// \details This is a portable C/C++ implementation. The value x to be rotated can be 8 to 64-bits wide.
|
||
|
/// \details R must be in the range <tt>[0, sizeof(T)*8 - 1]</tt> to avoid undefined behavior.
|
||
|
/// Use rotlMod if the rotate amount R is outside the range.
|
||
|
/// \details Use rotlConstant when the rotate amount is constant. The template function was added
|
||
|
/// because Clang did not propagate the constant when passed as a function parameter. Clang's
|
||
|
/// need for a constexpr meant rotlFixed failed to compile on occasion.
|
||
|
/// \note rotlConstant attempts to enlist a <tt>rotate IMM</tt> instruction because its often faster
|
||
|
/// than a <tt>rotate REG</tt>. Immediate rotates can be up to three times faster than their register
|
||
|
/// counterparts.
|
||
|
/// \sa rotlConstant, rotrConstant, rotlFixed, rotrFixed, rotlVariable, rotrVariable
|
||
|
/// \since Crypto++ 6.0
|
||
|
template <unsigned int R, class T> inline T rotlConstant(T x)
|
||
|
{
|
||
|
// Portable rotate that reduces to single instruction...
|
||
|
// http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57157,
|
||
|
// http://software.intel.com/en-us/forums/topic/580884
|
||
|
// and http://llvm.org/bugs/show_bug.cgi?id=24226
|
||
|
CRYPTOPP_CONSTANT(THIS_SIZE = sizeof(T)*8);
|
||
|
CRYPTOPP_CONSTANT(MASK = THIS_SIZE-1);
|
||
|
CRYPTOPP_ASSERT(static_cast<int>(R) < THIS_SIZE);
|
||
|
return T((x<<R)|(x>>(-R&MASK)));
|
||
|
}
|
||
|
|
||
|
/// \brief Performs a right rotate
|
||
|
/// \tparam R the number of bit positions to rotate the value
|
||
|
/// \tparam T the word type
|
||
|
/// \param x the value to rotate
|
||
|
/// \details This is a portable C/C++ implementation. The value x to be rotated can be 8 to 64-bits wide.
|
||
|
/// \details R must be in the range <tt>[0, sizeof(T)*8 - 1]</tt> to avoid undefined behavior.
|
||
|
/// Use rotrMod if the rotate amount R is outside the range.
|
||
|
/// \details Use rotrConstant when the rotate amount is constant. The template function was added
|
||
|
/// because Clang did not propagate the constant when passed as a function parameter. Clang's
|
||
|
/// need for a constexpr meant rotrFixed failed to compile on occasion.
|
||
|
/// \note rotrConstant attempts to enlist a <tt>rotate IMM</tt> instruction because its often faster
|
||
|
/// than a <tt>rotate REG</tt>. Immediate rotates can be up to three times faster than their register
|
||
|
/// counterparts.
|
||
|
/// \sa rotlConstant, rotrConstant, rotlFixed, rotrFixed, rotlVariable, rotrVariable
|
||
|
template <unsigned int R, class T> inline T rotrConstant(T x)
|
||
|
{
|
||
|
// Portable rotate that reduces to single instruction...
|
||
|
// http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57157,
|
||
|
// http://software.intel.com/en-us/forums/topic/580884
|
||
|
// and http://llvm.org/bugs/show_bug.cgi?id=24226
|
||
|
CRYPTOPP_CONSTANT(THIS_SIZE = sizeof(T)*8);
|
||
|
CRYPTOPP_CONSTANT(MASK = THIS_SIZE-1);
|
||
|
CRYPTOPP_ASSERT(static_cast<int>(R) < THIS_SIZE);
|
||
|
return T((x >> R)|(x<<(-R&MASK)));
|
||
|
}
|
||
|
|
||
|
/// \brief Performs a left rotate
|
||
|
/// \tparam T the word type
|
||
|
/// \param x the value to rotate
|
||
|
/// \param y the number of bit positions to rotate the value
|
||
|
/// \details This is a portable C/C++ implementation. The value x to be rotated can be 8 to 64-bits wide.
|
||
|
/// \details y must be in the range <tt>[0, sizeof(T)*8 - 1]</tt> to avoid undefined behavior.
|
||
|
/// Use rotlMod if the rotate amount y is outside the range.
|
||
|
/// \note rotlFixed attempts to enlist a <tt>rotate IMM</tt> instruction because its often faster
|
||
|
/// than a <tt>rotate REG</tt>. Immediate rotates can be up to three times faster than their register
|
||
|
/// counterparts. New code should use <tt>rotlConstant</tt>, which accepts the rotate amount as a
|
||
|
/// template parameter.
|
||
|
/// \sa rotlConstant, rotrConstant, rotlFixed, rotrFixed, rotlVariable, rotrVariable
|
||
|
/// \since Crypto++ 6.0
|
||
|
template <class T> inline T rotlFixed(T x, unsigned int y)
|
||
|
{
|
||
|
// Portable rotate that reduces to single instruction...
|
||
|
// http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57157,
|
||
|
// http://software.intel.com/en-us/forums/topic/580884
|
||
|
// and http://llvm.org/bugs/show_bug.cgi?id=24226
|
||
|
CRYPTOPP_CONSTANT(THIS_SIZE = sizeof(T)*8);
|
||
|
CRYPTOPP_CONSTANT(MASK = THIS_SIZE-1);
|
||
|
CRYPTOPP_ASSERT(static_cast<int>(y) < THIS_SIZE);
|
||
|
return T((x<<y)|(x>>(-y&MASK)));
|
||
|
}
|
||
|
|
||
|
/// \brief Performs a right rotate
|
||
|
/// \tparam T the word type
|
||
|
/// \param x the value to rotate
|
||
|
/// \param y the number of bit positions to rotate the value
|
||
|
/// \details This is a portable C/C++ implementation. The value x to be rotated can be 8 to 64-bits wide.
|
||
|
/// \details y must be in the range <tt>[0, sizeof(T)*8 - 1]</tt> to avoid undefined behavior.
|
||
|
/// Use rotrMod if the rotate amount y is outside the range.
|
||
|
/// \note rotrFixed attempts to enlist a <tt>rotate IMM</tt> instruction because its often faster
|
||
|
/// than a <tt>rotate REG</tt>. Immediate rotates can be up to three times faster than their register
|
||
|
/// counterparts. New code should use <tt>rotrConstant</tt>, which accepts the rotate amount as a
|
||
|
/// template parameter.
|
||
|
/// \sa rotlConstant, rotrConstant, rotlFixed, rotrFixed, rotlVariable, rotrVariable
|
||
|
/// \since Crypto++ 3.0
|
||
|
template <class T> inline T rotrFixed(T x, unsigned int y)
|
||
|
{
|
||
|
// Portable rotate that reduces to single instruction...
|
||
|
// http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57157,
|
||
|
// http://software.intel.com/en-us/forums/topic/580884
|
||
|
// and http://llvm.org/bugs/show_bug.cgi?id=24226
|
||
|
CRYPTOPP_CONSTANT(THIS_SIZE = sizeof(T)*8);
|
||
|
CRYPTOPP_CONSTANT(MASK = THIS_SIZE-1);
|
||
|
CRYPTOPP_ASSERT(static_cast<int>(y) < THIS_SIZE);
|
||
|
return T((x >> y)|(x<<(-y&MASK)));
|
||
|
}
|
||
|
|
||
|
/// \brief Performs a left rotate
|
||
|
/// \tparam T the word type
|
||
|
/// \param x the value to rotate
|
||
|
/// \param y the number of bit positions to rotate the value
|
||
|
/// \details This is a portable C/C++ implementation. The value x to be rotated can be 8 to 64-bits wide.
|
||
|
/// \details y must be in the range <tt>[0, sizeof(T)*8 - 1]</tt> to avoid undefined behavior.
|
||
|
/// Use rotlMod if the rotate amount y is outside the range.
|
||
|
/// \note rotlVariable attempts to enlist a <tt>rotate IMM</tt> instruction because its often faster
|
||
|
/// than a <tt>rotate REG</tt>. Immediate rotates can be up to three times faster than their register
|
||
|
/// counterparts.
|
||
|
/// \sa rotlConstant, rotrConstant, rotlFixed, rotrFixed, rotlVariable, rotrVariable
|
||
|
/// \since Crypto++ 3.0
|
||
|
template <class T> inline T rotlVariable(T x, unsigned int y)
|
||
|
{
|
||
|
CRYPTOPP_CONSTANT(THIS_SIZE = sizeof(T)*8);
|
||
|
CRYPTOPP_CONSTANT(MASK = THIS_SIZE-1);
|
||
|
CRYPTOPP_ASSERT(static_cast<int>(y) < THIS_SIZE);
|
||
|
return T((x<<y)|(x>>(-y&MASK)));
|
||
|
}
|
||
|
|
||
|
/// \brief Performs a right rotate
|
||
|
/// \tparam T the word type
|
||
|
/// \param x the value to rotate
|
||
|
/// \param y the number of bit positions to rotate the value
|
||
|
/// \details This is a portable C/C++ implementation. The value x to be rotated can be 8 to 64-bits wide.
|
||
|
/// \details y must be in the range <tt>[0, sizeof(T)*8 - 1]</tt> to avoid undefined behavior.
|
||
|
/// Use rotrMod if the rotate amount y is outside the range.
|
||
|
/// \note rotrVariable attempts to enlist a <tt>rotate IMM</tt> instruction because its often faster
|
||
|
/// than a <tt>rotate REG</tt>. Immediate rotates can be up to three times faster than their register
|
||
|
/// counterparts.
|
||
|
/// \sa rotlConstant, rotrConstant, rotlFixed, rotrFixed, rotlVariable, rotrVariable
|
||
|
/// \since Crypto++ 3.0
|
||
|
template <class T> inline T rotrVariable(T x, unsigned int y)
|
||
|
{
|
||
|
CRYPTOPP_CONSTANT(THIS_SIZE = sizeof(T)*8);
|
||
|
CRYPTOPP_CONSTANT(MASK = THIS_SIZE-1);
|
||
|
CRYPTOPP_ASSERT(static_cast<int>(y) < THIS_SIZE);
|
||
|
return T((x>>y)|(x<<(-y&MASK)));
|
||
|
}
|
||
|
|
||
|
/// \brief Performs a left rotate
|
||
|
/// \tparam T the word type
|
||
|
/// \param x the value to rotate
|
||
|
/// \param y the number of bit positions to rotate the value
|
||
|
/// \details This is a portable C/C++ implementation. The value x to be rotated can be 8 to 64-bits wide.
|
||
|
/// \details y is reduced to the range <tt>[0, sizeof(T)*8 - 1]</tt> to avoid undefined behavior.
|
||
|
/// \note rotrVariable will use either <tt>rotate IMM</tt> or <tt>rotate REG</tt>.
|
||
|
/// \sa rotlConstant, rotrConstant, rotlFixed, rotrFixed, rotlVariable, rotrVariable
|
||
|
/// \since Crypto++ 3.0
|
||
|
template <class T> inline T rotlMod(T x, unsigned int y)
|
||
|
{
|
||
|
CRYPTOPP_CONSTANT(THIS_SIZE = sizeof(T)*8);
|
||
|
CRYPTOPP_CONSTANT(MASK = THIS_SIZE-1);
|
||
|
return T((x<<(y&MASK))|(x>>(-y&MASK)));
|
||
|
}
|
||
|
|
||
|
/// \brief Performs a right rotate
|
||
|
/// \tparam T the word type
|
||
|
/// \param x the value to rotate
|
||
|
/// \param y the number of bit positions to rotate the value
|
||
|
/// \details This is a portable C/C++ implementation. The value x to be rotated can be 8 to 64-bits wide.
|
||
|
/// \details y is reduced to the range <tt>[0, sizeof(T)*8 - 1]</tt> to avoid undefined behavior.
|
||
|
/// \note rotrVariable will use either <tt>rotate IMM</tt> or <tt>rotate REG</tt>.
|
||
|
/// \sa rotlConstant, rotrConstant, rotlFixed, rotrFixed, rotlVariable, rotrVariable
|
||
|
/// \since Crypto++ 3.0
|
||
|
template <class T> inline T rotrMod(T x, unsigned int y)
|
||
|
{
|
||
|
CRYPTOPP_CONSTANT(THIS_SIZE = sizeof(T)*8);
|
||
|
CRYPTOPP_CONSTANT(MASK = THIS_SIZE-1);
|
||
|
return T((x>>(y&MASK))|(x<<(-y&MASK)));
|
||
|
}
|
||
|
|
||
|
#ifdef _MSC_VER
|
||
|
|
||
|
/// \brief Performs a left rotate
|
||
|
/// \tparam T the word type
|
||
|
/// \param x the 32-bit value to rotate
|
||
|
/// \param y the number of bit positions to rotate the value
|
||
|
/// \details This is a Microsoft specific implementation using <tt>_lrotl</tt> provided by
|
||
|
/// <stdlib.h>. The value x to be rotated is 32-bits. y must be in the range
|
||
|
/// <tt>[0, sizeof(T)*8 - 1]</tt> to avoid undefined behavior.
|
||
|
/// \note rotlFixed will assert in Debug builds if is outside the allowed range.
|
||
|
/// \since Crypto++ 3.0
|
||
|
template<> inline word32 rotlFixed<word32>(word32 x, unsigned int y)
|
||
|
{
|
||
|
// Uses Microsoft <stdlib.h> call, bound to C/C++ language rules.
|
||
|
CRYPTOPP_ASSERT(y < 8*sizeof(x));
|
||
|
return y ? _lrotl(x, static_cast<byte>(y)) : x;
|
||
|
}
|
||
|
|
||
|
/// \brief Performs a right rotate
|
||
|
/// \tparam T the word type
|
||
|
/// \param x the 32-bit value to rotate
|
||
|
/// \param y the number of bit positions to rotate the value
|
||
|
/// \details This is a Microsoft specific implementation using <tt>_lrotr</tt> provided by
|
||
|
/// <stdlib.h>. The value x to be rotated is 32-bits. y must be in the range
|
||
|
/// <tt>[0, sizeof(T)*8 - 1]</tt> to avoid undefined behavior.
|
||
|
/// \note rotrFixed will assert in Debug builds if is outside the allowed range.
|
||
|
/// \since Crypto++ 3.0
|
||
|
template<> inline word32 rotrFixed<word32>(word32 x, unsigned int y)
|
||
|
{
|
||
|
// Uses Microsoft <stdlib.h> call, bound to C/C++ language rules.
|
||
|
CRYPTOPP_ASSERT(y < 8*sizeof(x));
|
||
|
return y ? _lrotr(x, static_cast<byte>(y)) : x;
|
||
|
}
|
||
|
|
||
|
/// \brief Performs a left rotate
|
||
|
/// \tparam T the word type
|
||
|
/// \param x the 32-bit value to rotate
|
||
|
/// \param y the number of bit positions to rotate the value
|
||
|
/// \details This is a Microsoft specific implementation using <tt>_lrotl</tt> provided by
|
||
|
/// <stdlib.h>. The value x to be rotated is 32-bits. y must be in the range
|
||
|
/// <tt>[0, sizeof(T)*8 - 1]</tt> to avoid undefined behavior.
|
||
|
/// \note rotlVariable will assert in Debug builds if is outside the allowed range.
|
||
|
/// \since Crypto++ 3.0
|
||
|
template<> inline word32 rotlVariable<word32>(word32 x, unsigned int y)
|
||
|
{
|
||
|
CRYPTOPP_ASSERT(y < 8*sizeof(x));
|
||
|
return _lrotl(x, static_cast<byte>(y));
|
||
|
}
|
||
|
|
||
|
/// \brief Performs a right rotate
|
||
|
/// \tparam T the word type
|
||
|
/// \param x the 32-bit value to rotate
|
||
|
/// \param y the number of bit positions to rotate the value
|
||
|
/// \details This is a Microsoft specific implementation using <tt>_lrotr</tt> provided by
|
||
|
/// <stdlib.h>. The value x to be rotated is 32-bits. y must be in the range
|
||
|
/// <tt>[0, sizeof(T)*8 - 1]</tt> to avoid undefined behavior.
|
||
|
/// \note rotrVariable will assert in Debug builds if is outside the allowed range.
|
||
|
/// \since Crypto++ 3.0
|
||
|
template<> inline word32 rotrVariable<word32>(word32 x, unsigned int y)
|
||
|
{
|
||
|
CRYPTOPP_ASSERT(y < 8*sizeof(x));
|
||
|
return _lrotr(x, static_cast<byte>(y));
|
||
|
}
|
||
|
|
||
|
/// \brief Performs a left rotate
|
||
|
/// \tparam T the word type
|
||
|
/// \param x the 32-bit value to rotate
|
||
|
/// \param y the number of bit positions to rotate the value
|
||
|
/// \details This is a Microsoft specific implementation using <tt>_lrotl</tt> provided by
|
||
|
/// <stdlib.h>. The value x to be rotated is 32-bits. y must be in the range
|
||
|
/// <tt>[0, sizeof(T)*8 - 1]</tt> to avoid undefined behavior.
|
||
|
/// \since Crypto++ 3.0
|
||
|
template<> inline word32 rotlMod<word32>(word32 x, unsigned int y)
|
||
|
{
|
||
|
y %= 8*sizeof(x);
|
||
|
return _lrotl(x, static_cast<byte>(y));
|
||
|
}
|
||
|
|
||
|
/// \brief Performs a right rotate
|
||
|
/// \tparam T the word type
|
||
|
/// \param x the 32-bit value to rotate
|
||
|
/// \param y the number of bit positions to rotate the value
|
||
|
/// \details This is a Microsoft specific implementation using <tt>_lrotr</tt> provided by
|
||
|
/// <stdlib.h>. The value x to be rotated is 32-bits. y must be in the range
|
||
|
/// <tt>[0, sizeof(T)*8 - 1]</tt> to avoid undefined behavior.
|
||
|
/// \since Crypto++ 3.0
|
||
|
template<> inline word32 rotrMod<word32>(word32 x, unsigned int y)
|
||
|
{
|
||
|
y %= 8*sizeof(x);
|
||
|
return _lrotr(x, static_cast<byte>(y));
|
||
|
}
|
||
|
|
||
|
#endif // #ifdef _MSC_VER
|
||
|
|
||
|
#if (_MSC_VER >= 1400) || (defined(_MSC_VER) && !defined(_DLL))
|
||
|
// Intel C++ Compiler 10.0 calls a function instead of using the rotate instruction when using these instructions
|
||
|
|
||
|
/// \brief Performs a left rotate
|
||
|
/// \tparam T the word type
|
||
|
/// \param x the 64-bit value to rotate
|
||
|
/// \param y the number of bit positions to rotate the value
|
||
|
/// \details This is a Microsoft specific implementation using <tt>_lrotl</tt> provided by
|
||
|
/// <stdlib.h>. The value x to be rotated is 64-bits. y must be in the range
|
||
|
/// <tt>[0, sizeof(T)*8 - 1]</tt> to avoid undefined behavior.
|
||
|
/// \note rotrFixed will assert in Debug builds if is outside the allowed range.
|
||
|
/// \since Crypto++ 3.0
|
||
|
template<> inline word64 rotlFixed<word64>(word64 x, unsigned int y)
|
||
|
{
|
||
|
// Uses Microsoft <stdlib.h> call, bound to C/C++ language rules.
|
||
|
CRYPTOPP_ASSERT(y < 8*sizeof(x));
|
||
|
return y ? _rotl64(x, static_cast<byte>(y)) : x;
|
||
|
}
|
||
|
|
||
|
/// \brief Performs a right rotate
|
||
|
/// \tparam T the word type
|
||
|
/// \param x the 64-bit value to rotate
|
||
|
/// \param y the number of bit positions to rotate the value
|
||
|
/// \details This is a Microsoft specific implementation using <tt>_lrotr</tt> provided by
|
||
|
/// <stdlib.h>. The value x to be rotated is 64-bits. y must be in the range
|
||
|
/// <tt>[0, sizeof(T)*8 - 1]</tt> to avoid undefined behavior.
|
||
|
/// \note rotrFixed will assert in Debug builds if is outside the allowed range.
|
||
|
/// \since Crypto++ 3.0
|
||
|
template<> inline word64 rotrFixed<word64>(word64 x, unsigned int y)
|
||
|
{
|
||
|
// Uses Microsoft <stdlib.h> call, bound to C/C++ language rules.
|
||
|
CRYPTOPP_ASSERT(y < 8*sizeof(x));
|
||
|
return y ? _rotr64(x, static_cast<byte>(y)) : x;
|
||
|
}
|
||
|
|
||
|
/// \brief Performs a left rotate
|
||
|
/// \tparam T the word type
|
||
|
/// \param x the 64-bit value to rotate
|
||
|
/// \param y the number of bit positions to rotate the value
|
||
|
/// \details This is a Microsoft specific implementation using <tt>_lrotl</tt> provided by
|
||
|
/// <stdlib.h>. The value x to be rotated is 64-bits. y must be in the range
|
||
|
/// <tt>[0, sizeof(T)*8 - 1]</tt> to avoid undefined behavior.
|
||
|
/// \note rotlVariable will assert in Debug builds if is outside the allowed range.
|
||
|
/// \since Crypto++ 3.0
|
||
|
template<> inline word64 rotlVariable<word64>(word64 x, unsigned int y)
|
||
|
{
|
||
|
CRYPTOPP_ASSERT(y < 8*sizeof(x));
|
||
|
return _rotl64(x, static_cast<byte>(y));
|
||
|
}
|
||
|
|
||
|
/// \brief Performs a right rotate
|
||
|
/// \tparam T the word type
|
||
|
/// \param x the 64-bit value to rotate
|
||
|
/// \param y the number of bit positions to rotate the value
|
||
|
/// \details This is a Microsoft specific implementation using <tt>_lrotr</tt> provided by
|
||
|
/// <stdlib.h>. The value x to be rotated is 64-bits. y must be in the range
|
||
|
/// <tt>[0, sizeof(T)*8 - 1]</tt> to avoid undefined behavior.
|
||
|
/// \note rotrVariable will assert in Debug builds if is outside the allowed range.
|
||
|
/// \since Crypto++ 3.0
|
||
|
template<> inline word64 rotrVariable<word64>(word64 x, unsigned int y)
|
||
|
{
|
||
|
CRYPTOPP_ASSERT(y < 8*sizeof(x));
|
||
|
return y ? _rotr64(x, static_cast<byte>(y)) : x;
|
||
|
}
|
||
|
|
||
|
/// \brief Performs a left rotate
|
||
|
/// \tparam T the word type
|
||
|
/// \param x the 64-bit value to rotate
|
||
|
/// \param y the number of bit positions to rotate the value
|
||
|
/// \details This is a Microsoft specific implementation using <tt>_lrotl</tt> provided by
|
||
|
/// <stdlib.h>. The value x to be rotated is 64-bits. y must be in the range
|
||
|
/// <tt>[0, sizeof(T)*8 - 1]</tt> to avoid undefined behavior.
|
||
|
/// \since Crypto++ 3.0
|
||
|
template<> inline word64 rotlMod<word64>(word64 x, unsigned int y)
|
||
|
{
|
||
|
CRYPTOPP_ASSERT(y < 8*sizeof(x));
|
||
|
return y ? _rotl64(x, static_cast<byte>(y)) : x;
|
||
|
}
|
||
|
|
||
|
/// \brief Performs a right rotate
|
||
|
/// \tparam T the word type
|
||
|
/// \param x the 64-bit value to rotate
|
||
|
/// \param y the number of bit positions to rotate the value
|
||
|
/// \details This is a Microsoft specific implementation using <tt>_lrotr</tt> provided by
|
||
|
/// <stdlib.h>. The value x to be rotated is 64-bits. y must be in the range
|
||
|
/// <tt>[0, sizeof(T)*8 - 1]</tt> to avoid undefined behavior.
|
||
|
/// \since Crypto++ 3.0
|
||
|
template<> inline word64 rotrMod<word64>(word64 x, unsigned int y)
|
||
|
{
|
||
|
CRYPTOPP_ASSERT(y < 8*sizeof(x));
|
||
|
return y ? _rotr64(x, static_cast<byte>(y)) : x;
|
||
|
}
|
||
|
|
||
|
#endif // #if _MSC_VER >= 1310
|
||
|
|
||
|
#if _MSC_VER >= 1400 && !defined(__INTEL_COMPILER)
|
||
|
// Intel C++ Compiler 10.0 gives undefined externals with these
|
||
|
template<> inline word16 rotlFixed<word16>(word16 x, unsigned int y)
|
||
|
{
|
||
|
// Intrinsic, not bound to C/C++ language rules.
|
||
|
return _rotl16(x, static_cast<byte>(y));
|
||
|
}
|
||
|
|
||
|
template<> inline word16 rotrFixed<word16>(word16 x, unsigned int y)
|
||
|
{
|
||
|
// Intrinsic, not bound to C/C++ language rules.
|
||
|
return _rotr16(x, static_cast<byte>(y));
|
||
|
}
|
||
|
|
||
|
template<> inline word16 rotlVariable<word16>(word16 x, unsigned int y)
|
||
|
{
|
||
|
return _rotl16(x, static_cast<byte>(y));
|
||
|
}
|
||
|
|
||
|
template<> inline word16 rotrVariable<word16>(word16 x, unsigned int y)
|
||
|
{
|
||
|
return _rotr16(x, static_cast<byte>(y));
|
||
|
}
|
||
|
|
||
|
template<> inline word16 rotlMod<word16>(word16 x, unsigned int y)
|
||
|
{
|
||
|
return _rotl16(x, static_cast<byte>(y));
|
||
|
}
|
||
|
|
||
|
template<> inline word16 rotrMod<word16>(word16 x, unsigned int y)
|
||
|
{
|
||
|
return _rotr16(x, static_cast<byte>(y));
|
||
|
}
|
||
|
|
||
|
template<> inline byte rotlFixed<byte>(byte x, unsigned int y)
|
||
|
{
|
||
|
// Intrinsic, not bound to C/C++ language rules.
|
||
|
return _rotl8(x, static_cast<byte>(y));
|
||
|
}
|
||
|
|
||
|
template<> inline byte rotrFixed<byte>(byte x, unsigned int y)
|
||
|
{
|
||
|
// Intrinsic, not bound to C/C++ language rules.
|
||
|
return _rotr8(x, static_cast<byte>(y));
|
||
|
}
|
||
|
|
||
|
template<> inline byte rotlVariable<byte>(byte x, unsigned int y)
|
||
|
{
|
||
|
return _rotl8(x, static_cast<byte>(y));
|
||
|
}
|
||
|
|
||
|
template<> inline byte rotrVariable<byte>(byte x, unsigned int y)
|
||
|
{
|
||
|
return _rotr8(x, static_cast<byte>(y));
|
||
|
}
|
||
|
|
||
|
template<> inline byte rotlMod<byte>(byte x, unsigned int y)
|
||
|
{
|
||
|
return _rotl8(x, static_cast<byte>(y));
|
||
|
}
|
||
|
|
||
|
template<> inline byte rotrMod<byte>(byte x, unsigned int y)
|
||
|
{
|
||
|
return _rotr8(x, static_cast<byte>(y));
|
||
|
}
|
||
|
|
||
|
#endif // #if _MSC_VER >= 1400
|
||
|
|
||
|
#if (defined(__MWERKS__) && TARGET_CPU_PPC)
|
||
|
|
||
|
template<> inline word32 rotlFixed<word32>(word32 x, unsigned int y)
|
||
|
{
|
||
|
CRYPTOPP_ASSERT(y < 32);
|
||
|
return y ? __rlwinm(x,y,0,31) : x;
|
||
|
}
|
||
|
|
||
|
template<> inline word32 rotrFixed<word32>(word32 x, unsigned int y)
|
||
|
{
|
||
|
CRYPTOPP_ASSERT(y < 32);
|
||
|
return y ? __rlwinm(x,32-y,0,31) : x;
|
||
|
}
|
||
|
|
||
|
template<> inline word32 rotlVariable<word32>(word32 x, unsigned int y)
|
||
|
{
|
||
|
CRYPTOPP_ASSERT(y < 32);
|
||
|
return (__rlwnm(x,y,0,31));
|
||
|
}
|
||
|
|
||
|
template<> inline word32 rotrVariable<word32>(word32 x, unsigned int y)
|
||
|
{
|
||
|
CRYPTOPP_ASSERT(y < 32);
|
||
|
return (__rlwnm(x,32-y,0,31));
|
||
|
}
|
||
|
|
||
|
template<> inline word32 rotlMod<word32>(word32 x, unsigned int y)
|
||
|
{
|
||
|
return (__rlwnm(x,y,0,31));
|
||
|
}
|
||
|
|
||
|
template<> inline word32 rotrMod<word32>(word32 x, unsigned int y)
|
||
|
{
|
||
|
return (__rlwnm(x,32-y,0,31));
|
||
|
}
|
||
|
|
||
|
#endif // __MWERKS__ && TARGET_CPU_PPC
|
||
|
|
||
|
// ************** endian reversal ***************
|
||
|
|
||
|
/// \brief Gets a byte from a value
|
||
|
/// \param order the ByteOrder of the value
|
||
|
/// \param value the value to retrieve the byte
|
||
|
/// \param index the location of the byte to retrieve
|
||
|
template <class T>
|
||
|
inline unsigned int GetByte(ByteOrder order, T value, unsigned int index)
|
||
|
{
|
||
|
if (order == LITTLE_ENDIAN_ORDER)
|
||
|
return GETBYTE(value, index);
|
||
|
else
|
||
|
return GETBYTE(value, sizeof(T)-index-1);
|
||
|
}
|
||
|
|
||
|
/// \brief Reverses bytes in a 8-bit value
|
||
|
/// \param value the 8-bit value to reverse
|
||
|
/// \note ByteReverse returns the value passed to it since there is nothing to
|
||
|
/// reverse.
|
||
|
inline byte ByteReverse(byte value)
|
||
|
{
|
||
|
return value;
|
||
|
}
|
||
|
|
||
|
/// \brief Reverses bytes in a 16-bit value
|
||
|
/// \param value the 16-bit value to reverse
|
||
|
/// \details ByteReverse calls bswap if available. Otherwise the function
|
||
|
/// performs a 8-bit rotate on the word16.
|
||
|
inline word16 ByteReverse(word16 value)
|
||
|
{
|
||
|
#if defined(CRYPTOPP_BYTESWAP_AVAILABLE)
|
||
|
return bswap_16(value);
|
||
|
#elif (_MSC_VER >= 1400) || (defined(_MSC_VER) && !defined(_DLL))
|
||
|
return _byteswap_ushort(value);
|
||
|
#else
|
||
|
return rotlFixed(value, 8U);
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
/// \brief Reverses bytes in a 32-bit value
|
||
|
/// \param value the 32-bit value to reverse
|
||
|
/// \details ByteReverse calls bswap if available. Otherwise the function uses
|
||
|
/// a combination of rotates on the word32.
|
||
|
inline word32 ByteReverse(word32 value)
|
||
|
{
|
||
|
#if defined(CRYPTOPP_BYTESWAP_AVAILABLE)
|
||
|
return bswap_32(value);
|
||
|
#elif defined(CRYPTOPP_ARM_BYTEREV_AVAILABLE)
|
||
|
word32 rvalue;
|
||
|
__asm__ ("rev %0, %1" : "=r" (rvalue) : "r" (value));
|
||
|
return rvalue;
|
||
|
#elif defined(__GNUC__) && defined(CRYPTOPP_X86_ASM_AVAILABLE)
|
||
|
__asm__ ("bswap %0" : "=r" (value) : "0" (value));
|
||
|
return value;
|
||
|
#elif defined(__MWERKS__) && TARGET_CPU_PPC
|
||
|
return (word32)__lwbrx(&value,0);
|
||
|
#elif (_MSC_VER >= 1400) || (defined(_MSC_VER) && !defined(_DLL))
|
||
|
return _byteswap_ulong(value);
|
||
|
#elif CRYPTOPP_FAST_ROTATE(32) && !defined(__xlC__)
|
||
|
// 5 instructions with rotate instruction, 9 without
|
||
|
return (rotrFixed(value, 8U) & 0xff00ff00) | (rotlFixed(value, 8U) & 0x00ff00ff);
|
||
|
#else
|
||
|
// 6 instructions with rotate instruction, 8 without
|
||
|
value = ((value & 0xFF00FF00) >> 8) | ((value & 0x00FF00FF) << 8);
|
||
|
return rotlFixed(value, 16U);
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
/// \brief Reverses bytes in a 64-bit value
|
||
|
/// \param value the 64-bit value to reverse
|
||
|
/// \details ByteReverse calls bswap if available. Otherwise the function uses
|
||
|
/// a combination of rotates on the word64.
|
||
|
inline word64 ByteReverse(word64 value)
|
||
|
{
|
||
|
#if defined(CRYPTOPP_BYTESWAP_AVAILABLE)
|
||
|
return bswap_64(value);
|
||
|
#elif defined(__GNUC__) && defined(CRYPTOPP_X86_ASM_AVAILABLE) && defined(__x86_64__)
|
||
|
__asm__ ("bswap %0" : "=r" (value) : "0" (value));
|
||
|
return value;
|
||
|
#elif (_MSC_VER >= 1400) || (defined(_MSC_VER) && !defined(_DLL))
|
||
|
return _byteswap_uint64(value);
|
||
|
#elif CRYPTOPP_BOOL_SLOW_WORD64
|
||
|
return (word64(ByteReverse(word32(value))) << 32) | ByteReverse(word32(value>>32));
|
||
|
#else
|
||
|
value = ((value & W64LIT(0xFF00FF00FF00FF00)) >> 8) | ((value & W64LIT(0x00FF00FF00FF00FF)) << 8);
|
||
|
value = ((value & W64LIT(0xFFFF0000FFFF0000)) >> 16) | ((value & W64LIT(0x0000FFFF0000FFFF)) << 16);
|
||
|
return rotlFixed(value, 32U);
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
/// \brief Reverses bits in a 8-bit value
|
||
|
/// \param value the 8-bit value to reverse
|
||
|
/// \details BitReverse performs a combination of shifts on the byte.
|
||
|
inline byte BitReverse(byte value)
|
||
|
{
|
||
|
value = byte((value & 0xAA) >> 1) | byte((value & 0x55) << 1);
|
||
|
value = byte((value & 0xCC) >> 2) | byte((value & 0x33) << 2);
|
||
|
return rotlFixed(value, 4U);
|
||
|
}
|
||
|
|
||
|
/// \brief Reverses bits in a 16-bit value
|
||
|
/// \param value the 16-bit value to reverse
|
||
|
/// \details BitReverse performs a combination of shifts on the word16.
|
||
|
inline word16 BitReverse(word16 value)
|
||
|
{
|
||
|
#if defined(CRYPTOPP_ARM_BITREV_AVAILABLE)
|
||
|
// 4 instructions on ARM.
|
||
|
word32 rvalue;
|
||
|
__asm__ ("rbit %0, %1" : "=r" (rvalue) : "r" (value));
|
||
|
return word16(rvalue >> 16);
|
||
|
#else
|
||
|
// 15 instructions on ARM.
|
||
|
value = word16((value & 0xAAAA) >> 1) | word16((value & 0x5555) << 1);
|
||
|
value = word16((value & 0xCCCC) >> 2) | word16((value & 0x3333) << 2);
|
||
|
value = word16((value & 0xF0F0) >> 4) | word16((value & 0x0F0F) << 4);
|
||
|
return ByteReverse(value);
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
/// \brief Reverses bits in a 32-bit value
|
||
|
/// \param value the 32-bit value to reverse
|
||
|
/// \details BitReverse performs a combination of shifts on the word32.
|
||
|
inline word32 BitReverse(word32 value)
|
||
|
{
|
||
|
#if defined(CRYPTOPP_ARM_BITREV_AVAILABLE)
|
||
|
// 2 instructions on ARM.
|
||
|
word32 rvalue;
|
||
|
__asm__ ("rbit %0, %1" : "=r" (rvalue) : "r" (value));
|
||
|
return rvalue;
|
||
|
#else
|
||
|
// 19 instructions on ARM.
|
||
|
value = word32((value & 0xAAAAAAAA) >> 1) | word32((value & 0x55555555) << 1);
|
||
|
value = word32((value & 0xCCCCCCCC) >> 2) | word32((value & 0x33333333) << 2);
|
||
|
value = word32((value & 0xF0F0F0F0) >> 4) | word32((value & 0x0F0F0F0F) << 4);
|
||
|
return ByteReverse(value);
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
/// \brief Reverses bits in a 64-bit value
|
||
|
/// \param value the 64-bit value to reverse
|
||
|
/// \details BitReverse performs a combination of shifts on the word64.
|
||
|
inline word64 BitReverse(word64 value)
|
||
|
{
|
||
|
#if CRYPTOPP_BOOL_SLOW_WORD64
|
||
|
return (word64(BitReverse(word32(value))) << 32) | BitReverse(word32(value>>32));
|
||
|
#else
|
||
|
value = word64((value & W64LIT(0xAAAAAAAAAAAAAAAA)) >> 1) | word64((value & W64LIT(0x5555555555555555)) << 1);
|
||
|
value = word64((value & W64LIT(0xCCCCCCCCCCCCCCCC)) >> 2) | word64((value & W64LIT(0x3333333333333333)) << 2);
|
||
|
value = word64((value & W64LIT(0xF0F0F0F0F0F0F0F0)) >> 4) | word64((value & W64LIT(0x0F0F0F0F0F0F0F0F)) << 4);
|
||
|
return ByteReverse(value);
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
/// \brief Reverses bits in a value
|
||
|
/// \param value the value to reverse
|
||
|
/// \details The template overload of BitReverse operates on signed and unsigned values.
|
||
|
/// Internally the size of T is checked, and then value is cast to a byte,
|
||
|
/// word16, word32 or word64. After the cast, the appropriate BitReverse
|
||
|
/// overload is called.
|
||
|
template <class T>
|
||
|
inline T BitReverse(T value)
|
||
|
{
|
||
|
if (sizeof(T) == 1)
|
||
|
return (T)BitReverse((byte)value);
|
||
|
else if (sizeof(T) == 2)
|
||
|
return (T)BitReverse((word16)value);
|
||
|
else if (sizeof(T) == 4)
|
||
|
return (T)BitReverse((word32)value);
|
||
|
else if (sizeof(T) == 8)
|
||
|
return (T)BitReverse((word64)value);
|
||
|
else
|
||
|
{
|
||
|
CRYPTOPP_ASSERT(0);
|
||
|
return (T)BitReverse((word64)value);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/// \brief Reverses bytes in a value depending upon endianness
|
||
|
/// \tparam T the class or type
|
||
|
/// \param order the ByteOrder of the data
|
||
|
/// \param value the value to conditionally reverse
|
||
|
/// \details Internally, the ConditionalByteReverse calls NativeByteOrderIs.
|
||
|
/// If order matches native byte order, then the original value is returned.
|
||
|
/// If not, then ByteReverse is called on the value before returning to the caller.
|
||
|
template <class T>
|
||
|
inline T ConditionalByteReverse(ByteOrder order, T value)
|
||
|
{
|
||
|
return NativeByteOrderIs(order) ? value : ByteReverse(value);
|
||
|
}
|
||
|
|
||
|
/// \brief Reverses bytes in an element from an array of elements
|
||
|
/// \tparam T the class or type
|
||
|
/// \param out the output array of elements
|
||
|
/// \param in the input array of elements
|
||
|
/// \param byteCount the total number of bytes in the array
|
||
|
/// \details Internally, ByteReverse visits each element in the in array
|
||
|
/// calls ByteReverse on it, and writes the result to out.
|
||
|
/// \details ByteReverse does not process tail byes, or bytes that are
|
||
|
/// not part of a full element. If T is int (and int is 4 bytes), then
|
||
|
/// <tt>byteCount = 10</tt> means only the first 2 elements or 8 bytes are
|
||
|
/// reversed.
|
||
|
/// \details The following program should help illustrate the behavior.
|
||
|
/// <pre>vector<word32> v1, v2;
|
||
|
///
|
||
|
/// v1.push_back(1);
|
||
|
/// v1.push_back(2);
|
||
|
/// v1.push_back(3);
|
||
|
/// v1.push_back(4);
|
||
|
///
|
||
|
/// v2.resize(v1.size());
|
||
|
/// ByteReverse<word32>(&v2[0], &v1[0], 16);
|
||
|
///
|
||
|
/// cout << "V1: ";
|
||
|
/// for(unsigned int i = 0; i < v1.size(); i++)
|
||
|
/// cout << std::hex << v1[i] << " ";
|
||
|
/// cout << endl;
|
||
|
///
|
||
|
/// cout << "V2: ";
|
||
|
/// for(unsigned int i = 0; i < v2.size(); i++)
|
||
|
/// cout << std::hex << v2[i] << " ";
|
||
|
/// cout << endl;</pre>
|
||
|
/// The program above results in the following output.
|
||
|
/// <pre>V1: 00000001 00000002 00000003 00000004
|
||
|
/// V2: 01000000 02000000 03000000 04000000</pre>
|
||
|
/// \sa ConditionalByteReverse
|
||
|
template <class T>
|
||
|
void ByteReverse(T *out, const T *in, size_t byteCount)
|
||
|
{
|
||
|
// Alignment check due to Issues 690
|
||
|
CRYPTOPP_ASSERT(byteCount % sizeof(T) == 0);
|
||
|
CRYPTOPP_ASSERT(IsAligned<T>(in));
|
||
|
CRYPTOPP_ASSERT(IsAligned<T>(out));
|
||
|
|
||
|
size_t count = byteCount/sizeof(T);
|
||
|
for (size_t i=0; i<count; i++)
|
||
|
out[i] = ByteReverse(in[i]);
|
||
|
}
|
||
|
|
||
|
/// \brief Conditionally reverses bytes in an element from an array of elements
|
||
|
/// \tparam T the class or type
|
||
|
/// \param order the ByteOrder of the data
|
||
|
/// \param out the output array of elements
|
||
|
/// \param in the input array of elements
|
||
|
/// \param byteCount the byte count of the arrays
|
||
|
/// \details Internally, ByteReverse visits each element in the in array
|
||
|
/// calls ByteReverse on it depending on the desired endianness, and writes the result to out.
|
||
|
/// \details ByteReverse does not process tail byes, or bytes that are
|
||
|
/// not part of a full element. If T is int (and int is 4 bytes), then
|
||
|
/// <tt>byteCount = 10</tt> means only the first 2 elements or 8 bytes are
|
||
|
/// reversed.
|
||
|
/// \sa ByteReverse
|
||
|
template <class T>
|
||
|
inline void ConditionalByteReverse(ByteOrder order, T *out, const T *in, size_t byteCount)
|
||
|
{
|
||
|
if (!NativeByteOrderIs(order))
|
||
|
ByteReverse(out, in, byteCount);
|
||
|
else if (in != out)
|
||
|
memcpy_s(out, byteCount, in, byteCount);
|
||
|
}
|
||
|
|
||
|
template <class T>
|
||
|
inline void GetUserKey(ByteOrder order, T *out, size_t outlen, const byte *in, size_t inlen)
|
||
|
{
|
||
|
const size_t U = sizeof(T);
|
||
|
CRYPTOPP_ASSERT(inlen <= outlen*U);
|
||
|
memcpy_s(out, outlen*U, in, inlen);
|
||
|
memset_z((byte *)out+inlen, 0, outlen*U-inlen);
|
||
|
ConditionalByteReverse(order, out, out, RoundUpToMultipleOf(inlen, U));
|
||
|
}
|
||
|
|
||
|
inline byte UnalignedGetWordNonTemplate(ByteOrder order, const byte *block, const byte *)
|
||
|
{
|
||
|
CRYPTOPP_UNUSED(order);
|
||
|
return block[0];
|
||
|
}
|
||
|
|
||
|
inline word16 UnalignedGetWordNonTemplate(ByteOrder order, const byte *block, const word16 *)
|
||
|
{
|
||
|
return (order == BIG_ENDIAN_ORDER)
|
||
|
? block[1] | (block[0] << 8)
|
||
|
: block[0] | (block[1] << 8);
|
||
|
}
|
||
|
|
||
|
inline word32 UnalignedGetWordNonTemplate(ByteOrder order, const byte *block, const word32 *)
|
||
|
{
|
||
|
return (order == BIG_ENDIAN_ORDER)
|
||
|
? word32(block[3]) | (word32(block[2]) << 8) | (word32(block[1]) << 16) | (word32(block[0]) << 24)
|
||
|
: word32(block[0]) | (word32(block[1]) << 8) | (word32(block[2]) << 16) | (word32(block[3]) << 24);
|
||
|
}
|
||
|
|
||
|
inline word64 UnalignedGetWordNonTemplate(ByteOrder order, const byte *block, const word64 *)
|
||
|
{
|
||
|
return (order == BIG_ENDIAN_ORDER)
|
||
|
?
|
||
|
(word64(block[7]) |
|
||
|
(word64(block[6]) << 8) |
|
||
|
(word64(block[5]) << 16) |
|
||
|
(word64(block[4]) << 24) |
|
||
|
(word64(block[3]) << 32) |
|
||
|
(word64(block[2]) << 40) |
|
||
|
(word64(block[1]) << 48) |
|
||
|
(word64(block[0]) << 56))
|
||
|
:
|
||
|
(word64(block[0]) |
|
||
|
(word64(block[1]) << 8) |
|
||
|
(word64(block[2]) << 16) |
|
||
|
(word64(block[3]) << 24) |
|
||
|
(word64(block[4]) << 32) |
|
||
|
(word64(block[5]) << 40) |
|
||
|
(word64(block[6]) << 48) |
|
||
|
(word64(block[7]) << 56));
|
||
|
}
|
||
|
|
||
|
inline void UnalignedbyteNonTemplate(ByteOrder order, byte *block, byte value, const byte *xorBlock)
|
||
|
{
|
||
|
CRYPTOPP_UNUSED(order);
|
||
|
block[0] = static_cast<byte>(xorBlock ? (value ^ xorBlock[0]) : value);
|
||
|
}
|
||
|
|
||
|
inline void UnalignedbyteNonTemplate(ByteOrder order, byte *block, word16 value, const byte *xorBlock)
|
||
|
{
|
||
|
if (order == BIG_ENDIAN_ORDER)
|
||
|
{
|
||
|
if (xorBlock)
|
||
|
{
|
||
|
block[0] = xorBlock[0] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 1);
|
||
|
block[1] = xorBlock[1] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 0);
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
block[0] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 1);
|
||
|
block[1] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 0);
|
||
|
}
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
if (xorBlock)
|
||
|
{
|
||
|
block[0] = xorBlock[0] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 0);
|
||
|
block[1] = xorBlock[1] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 1);
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
block[0] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 0);
|
||
|
block[1] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 1);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
inline void UnalignedbyteNonTemplate(ByteOrder order, byte *block, word32 value, const byte *xorBlock)
|
||
|
{
|
||
|
if (order == BIG_ENDIAN_ORDER)
|
||
|
{
|
||
|
if (xorBlock)
|
||
|
{
|
||
|
block[0] = xorBlock[0] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 3);
|
||
|
block[1] = xorBlock[1] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 2);
|
||
|
block[2] = xorBlock[2] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 1);
|
||
|
block[3] = xorBlock[3] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 0);
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
block[0] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 3);
|
||
|
block[1] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 2);
|
||
|
block[2] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 1);
|
||
|
block[3] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 0);
|
||
|
}
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
if (xorBlock)
|
||
|
{
|
||
|
block[0] = xorBlock[0] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 0);
|
||
|
block[1] = xorBlock[1] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 1);
|
||
|
block[2] = xorBlock[2] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 2);
|
||
|
block[3] = xorBlock[3] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 3);
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
block[0] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 0);
|
||
|
block[1] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 1);
|
||
|
block[2] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 2);
|
||
|
block[3] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 3);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
inline void UnalignedbyteNonTemplate(ByteOrder order, byte *block, word64 value, const byte *xorBlock)
|
||
|
{
|
||
|
if (order == BIG_ENDIAN_ORDER)
|
||
|
{
|
||
|
if (xorBlock)
|
||
|
{
|
||
|
block[0] = xorBlock[0] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 7);
|
||
|
block[1] = xorBlock[1] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 6);
|
||
|
block[2] = xorBlock[2] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 5);
|
||
|
block[3] = xorBlock[3] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 4);
|
||
|
block[4] = xorBlock[4] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 3);
|
||
|
block[5] = xorBlock[5] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 2);
|
||
|
block[6] = xorBlock[6] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 1);
|
||
|
block[7] = xorBlock[7] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 0);
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
block[0] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 7);
|
||
|
block[1] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 6);
|
||
|
block[2] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 5);
|
||
|
block[3] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 4);
|
||
|
block[4] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 3);
|
||
|
block[5] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 2);
|
||
|
block[6] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 1);
|
||
|
block[7] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 0);
|
||
|
}
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
if (xorBlock)
|
||
|
{
|
||
|
block[0] = xorBlock[0] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 0);
|
||
|
block[1] = xorBlock[1] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 1);
|
||
|
block[2] = xorBlock[2] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 2);
|
||
|
block[3] = xorBlock[3] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 3);
|
||
|
block[4] = xorBlock[4] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 4);
|
||
|
block[5] = xorBlock[5] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 5);
|
||
|
block[6] = xorBlock[6] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 6);
|
||
|
block[7] = xorBlock[7] ^ CRYPTOPP_GET_BYTE_AS_BYTE(value, 7);
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
block[0] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 0);
|
||
|
block[1] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 1);
|
||
|
block[2] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 2);
|
||
|
block[3] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 3);
|
||
|
block[4] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 4);
|
||
|
block[5] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 5);
|
||
|
block[6] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 6);
|
||
|
block[7] = CRYPTOPP_GET_BYTE_AS_BYTE(value, 7);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/// \brief Access a block of memory
|
||
|
/// \tparam T class or type
|
||
|
/// \param assumeAligned flag indicating alignment
|
||
|
/// \param order the ByteOrder of the data
|
||
|
/// \param block the byte buffer to be processed
|
||
|
/// \returns the word in the specified byte order
|
||
|
/// \details GetWord() provides alternate read access to a block of memory. The flag assumeAligned indicates
|
||
|
/// if the memory block is aligned for class or type T. The enumeration ByteOrder is BIG_ENDIAN_ORDER or
|
||
|
/// LITTLE_ENDIAN_ORDER.
|
||
|
/// \details An example of reading two word32 values from a block of memory is shown below. <tt>w</tt>
|
||
|
/// will be <tt>0x03020100</tt>.
|
||
|
/// <pre>
|
||
|
/// word32 w;
|
||
|
/// byte buffer[4] = {0,1,2,3};
|
||
|
/// w = GetWord<word32>(false, LITTLE_ENDIAN_ORDER, buffer);
|
||
|
/// </pre>
|
||
|
template <class T>
|
||
|
inline T GetWord(bool assumeAligned, ByteOrder order, const byte *block)
|
||
|
{
|
||
|
CRYPTOPP_UNUSED(assumeAligned);
|
||
|
|
||
|
T temp = 0;
|
||
|
if (block != NULLPTR) {std::memcpy(&temp, block, sizeof(T));}
|
||
|
return ConditionalByteReverse(order, temp);
|
||
|
}
|
||
|
|
||
|
/// \brief Access a block of memory
|
||
|
/// \tparam T class or type
|
||
|
/// \param assumeAligned flag indicating alignment
|
||
|
/// \param order the ByteOrder of the data
|
||
|
/// \param result the word in the specified byte order
|
||
|
/// \param block the byte buffer to be processed
|
||
|
/// \details GetWord() provides alternate read access to a block of memory. The flag assumeAligned indicates
|
||
|
/// if the memory block is aligned for class or type T. The enumeration ByteOrder is BIG_ENDIAN_ORDER or
|
||
|
/// LITTLE_ENDIAN_ORDER.
|
||
|
/// \details An example of reading two word32 values from a block of memory is shown below. <tt>w</tt>
|
||
|
/// will be <tt>0x03020100</tt>.
|
||
|
/// <pre>
|
||
|
/// word32 w;
|
||
|
/// byte buffer[4] = {0,1,2,3};
|
||
|
/// w = GetWord<word32>(false, LITTLE_ENDIAN_ORDER, buffer);
|
||
|
/// </pre>
|
||
|
template <class T>
|
||
|
inline void GetWord(bool assumeAligned, ByteOrder order, T &result, const byte *block)
|
||
|
{
|
||
|
result = GetWord<T>(assumeAligned, order, block);
|
||
|
}
|
||
|
|
||
|
/// \brief Access a block of memory
|
||
|
/// \tparam T class or type
|
||
|
/// \param assumeAligned flag indicating alignment
|
||
|
/// \param order the ByteOrder of the data
|
||
|
/// \param block the destination byte buffer
|
||
|
/// \param value the word in the specified byte order
|
||
|
/// \param xorBlock an optional byte buffer to xor
|
||
|
/// \details PutWord() provides alternate write access to a block of memory. The flag assumeAligned indicates
|
||
|
/// if the memory block is aligned for class or type T. The enumeration ByteOrder is BIG_ENDIAN_ORDER or
|
||
|
/// LITTLE_ENDIAN_ORDER.
|
||
|
template <class T>
|
||
|
inline void PutWord(bool assumeAligned, ByteOrder order, byte *block, T value, const byte *xorBlock = NULLPTR)
|
||
|
{
|
||
|
CRYPTOPP_UNUSED(assumeAligned);
|
||
|
|
||
|
T t1, t2;
|
||
|
t1 = ConditionalByteReverse(order, value);
|
||
|
if (xorBlock != NULLPTR) {std::memcpy(&t2, xorBlock, sizeof(T)); t1 ^= t2;}
|
||
|
if (block != NULLPTR) {std::memcpy(block, &t1, sizeof(T));}
|
||
|
}
|
||
|
|
||
|
/// \brief Access a block of memory
|
||
|
/// \tparam T class or type
|
||
|
/// \tparam B enumeration indicating endianness
|
||
|
/// \tparam A flag indicating alignment
|
||
|
/// \details GetBlock() provides alternate read access to a block of memory. The enumeration B is
|
||
|
/// BigEndian or LittleEndian. The flag A indicates if the memory block is aligned for class or type T.
|
||
|
/// Repeatedly applying operator() results in advancing in the block of memory.
|
||
|
/// \details An example of reading two word32 values from a block of memory is shown below. <tt>w1</tt>
|
||
|
/// will be <tt>0x03020100</tt> and <tt>w1</tt> will be <tt>0x07060504</tt>.
|
||
|
/// <pre>
|
||
|
/// word32 w1, w2;
|
||
|
/// byte buffer[8] = {0,1,2,3,4,5,6,7};
|
||
|
/// GetBlock<word32, LittleEndian> block(buffer);
|
||
|
/// block(w1)(w2);
|
||
|
/// </pre>
|
||
|
template <class T, class B, bool A=false>
|
||
|
class GetBlock
|
||
|
{
|
||
|
public:
|
||
|
/// \brief Construct a GetBlock
|
||
|
/// \param block the memory block
|
||
|
GetBlock(const void *block)
|
||
|
: m_block((const byte *)block) {}
|
||
|
|
||
|
/// \brief Access a block of memory
|
||
|
/// \tparam U class or type
|
||
|
/// \param x the value to read
|
||
|
/// \returns pointer to the remainder of the block after reading x
|
||
|
template <class U>
|
||
|
inline GetBlock<T, B, A> & operator()(U &x)
|
||
|
{
|
||
|
CRYPTOPP_COMPILE_ASSERT(sizeof(U) >= sizeof(T));
|
||
|
x = GetWord<T>(A, B::ToEnum(), m_block);
|
||
|
m_block += sizeof(T);
|
||
|
return *this;
|
||
|
}
|
||
|
|
||
|
private:
|
||
|
const byte *m_block;
|
||
|
};
|
||
|
|
||
|
/// \brief Access a block of memory
|
||
|
/// \tparam T class or type
|
||
|
/// \tparam B enumeration indicating endianness
|
||
|
/// \tparam A flag indicating alignment
|
||
|
/// \details PutBlock() provides alternate write access to a block of memory. The enumeration B is
|
||
|
/// BigEndian or LittleEndian. The flag A indicates if the memory block is aligned for class or type T.
|
||
|
/// Repeatedly applying operator() results in advancing in the block of memory.
|
||
|
/// \details An example of writing two word32 values from a block of memory is shown below. After the code
|
||
|
/// executes, the byte buffer will be <tt>{0,1,2,3,4,5,6,7}</tt>.
|
||
|
/// <pre>
|
||
|
/// word32 w1=0x03020100, w2=0x07060504;
|
||
|
/// byte buffer[8];
|
||
|
/// PutBlock<word32, LittleEndian> block(NULLPTR, buffer);
|
||
|
/// block(w1)(w2);
|
||
|
/// </pre>
|
||
|
template <class T, class B, bool A=false>
|
||
|
class PutBlock
|
||
|
{
|
||
|
public:
|
||
|
/// \brief Construct a PutBlock
|
||
|
/// \param block the memory block
|
||
|
/// \param xorBlock optional mask
|
||
|
PutBlock(const void *xorBlock, void *block)
|
||
|
: m_xorBlock((const byte *)xorBlock), m_block((byte *)block) {}
|
||
|
|
||
|
/// \brief Access a block of memory
|
||
|
/// \tparam U class or type
|
||
|
/// \param x the value to write
|
||
|
/// \returns pointer to the remainder of the block after writing x
|
||
|
template <class U>
|
||
|
inline PutBlock<T, B, A> & operator()(U x)
|
||
|
{
|
||
|
PutWord(A, B::ToEnum(), m_block, (T)x, m_xorBlock);
|
||
|
m_block += sizeof(T);
|
||
|
if (m_xorBlock)
|
||
|
m_xorBlock += sizeof(T);
|
||
|
return *this;
|
||
|
}
|
||
|
|
||
|
private:
|
||
|
const byte *m_xorBlock;
|
||
|
byte *m_block;
|
||
|
};
|
||
|
|
||
|
/// \brief Access a block of memory
|
||
|
/// \tparam T class or type
|
||
|
/// \tparam B enumeration indicating endianness
|
||
|
/// \tparam GA flag indicating alignment for the Get operation
|
||
|
/// \tparam PA flag indicating alignment for the Put operation
|
||
|
/// \details GetBlock() provides alternate write access to a block of memory. The enumeration B is
|
||
|
/// BigEndian or LittleEndian. The flag A indicates if the memory block is aligned for class or type T.
|
||
|
/// \sa GetBlock() and PutBlock().
|
||
|
template <class T, class B, bool GA=false, bool PA=false>
|
||
|
struct BlockGetAndPut
|
||
|
{
|
||
|
// function needed because of C++ grammatical ambiguity between expression-statements and declarations
|
||
|
static inline GetBlock<T, B, GA> Get(const void *block) {return GetBlock<T, B, GA>(block);}
|
||
|
typedef PutBlock<T, B, PA> Put;
|
||
|
};
|
||
|
|
||
|
/// \brief Convert a word to a string
|
||
|
/// \tparam T class or type
|
||
|
/// \param value the word to convert
|
||
|
/// \param order byte order
|
||
|
/// \returns a string representing the value of the word
|
||
|
template <class T>
|
||
|
std::string WordToString(T value, ByteOrder order = BIG_ENDIAN_ORDER)
|
||
|
{
|
||
|
if (!NativeByteOrderIs(order))
|
||
|
value = ByteReverse(value);
|
||
|
|
||
|
return std::string((char *)&value, sizeof(value));
|
||
|
}
|
||
|
|
||
|
/// \brief Convert a string to a word
|
||
|
/// \tparam T class or type
|
||
|
/// \param str the string to convert
|
||
|
/// \param order byte order
|
||
|
/// \returns a word representing the value of the string
|
||
|
template <class T>
|
||
|
T StringToWord(const std::string &str, ByteOrder order = BIG_ENDIAN_ORDER)
|
||
|
{
|
||
|
T value = 0;
|
||
|
memcpy_s(&value, sizeof(value), str.data(), UnsignedMin(str.size(), sizeof(value)));
|
||
|
return NativeByteOrderIs(order) ? value : ByteReverse(value);
|
||
|
}
|
||
|
|
||
|
// ************** help remove warning on g++ ***************
|
||
|
|
||
|
/// \brief Safely shift values when undefined behavior could occur
|
||
|
/// \tparam overflow boolean flag indicating if overflow is present
|
||
|
/// \details SafeShifter safely shifts values when undefined behavior could occur under C/C++ rules.
|
||
|
/// The class behaves much like a saturating arithmetic class, clamping values rather than allowing
|
||
|
/// the compiler to remove undefined behavior.
|
||
|
/// \sa SafeShifter<true>, SafeShifter<false>
|
||
|
template <bool overflow> struct SafeShifter;
|
||
|
|
||
|
/// \brief Shifts a value in the presence of overflow
|
||
|
/// \details the true template parameter indicates overflow would occur.
|
||
|
/// In this case, SafeShifter clamps the value and returns 0.
|
||
|
template<> struct SafeShifter<true>
|
||
|
{
|
||
|
/// \brief Right shifts a value that overflows
|
||
|
/// \tparam T class or type
|
||
|
/// \return 0
|
||
|
/// \details Since <tt>overflow == true</tt>, the value 0 is always returned.
|
||
|
/// \sa SafeLeftShift
|
||
|
template <class T>
|
||
|
static inline T RightShift(T value, unsigned int bits)
|
||
|
{
|
||
|
CRYPTOPP_UNUSED(value); CRYPTOPP_UNUSED(bits);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/// \brief Left shifts a value that overflows
|
||
|
/// \tparam T class or type
|
||
|
/// \return 0
|
||
|
/// \details Since <tt>overflow == true</tt>, the value 0 is always returned.
|
||
|
/// \sa SafeRightShift
|
||
|
template <class T>
|
||
|
static inline T LeftShift(T value, unsigned int bits)
|
||
|
{
|
||
|
CRYPTOPP_UNUSED(value); CRYPTOPP_UNUSED(bits);
|
||
|
return 0;
|
||
|
}
|
||
|
};
|
||
|
|
||
|
/// \brief Shifts a value in the absence of overflow
|
||
|
/// \details the false template parameter indicates overflow would not occur.
|
||
|
/// In this case, SafeShifter returns the shfted value.
|
||
|
template<> struct SafeShifter<false>
|
||
|
{
|
||
|
/// \brief Right shifts a value that does not overflow
|
||
|
/// \tparam T class or type
|
||
|
/// \return the shifted value
|
||
|
/// \details Since <tt>overflow == false</tt>, the shifted value is returned.
|
||
|
/// \sa SafeLeftShift
|
||
|
template <class T>
|
||
|
static inline T RightShift(T value, unsigned int bits)
|
||
|
{
|
||
|
return value >> bits;
|
||
|
}
|
||
|
|
||
|
/// \brief Left shifts a value that does not overflow
|
||
|
/// \tparam T class or type
|
||
|
/// \return the shifted value
|
||
|
/// \details Since <tt>overflow == false</tt>, the shifted value is returned.
|
||
|
/// \sa SafeRightShift
|
||
|
template <class T>
|
||
|
static inline T LeftShift(T value, unsigned int bits)
|
||
|
{
|
||
|
return value << bits;
|
||
|
}
|
||
|
};
|
||
|
|
||
|
/// \brief Safely right shift values when undefined behavior could occur
|
||
|
/// \tparam bits the number of bit positions to shift the value
|
||
|
/// \tparam T class or type
|
||
|
/// \param value the value to right shift
|
||
|
/// \result the shifted value or 0
|
||
|
/// \details SafeRightShift safely shifts the value to the right when undefined behavior
|
||
|
/// could occur under C/C++ rules. SafeRightShift will return the shifted value or 0
|
||
|
/// if undefined behavior would occur.
|
||
|
template <unsigned int bits, class T>
|
||
|
inline T SafeRightShift(T value)
|
||
|
{
|
||
|
return SafeShifter<(bits>=(8*sizeof(T)))>::RightShift(value, bits);
|
||
|
}
|
||
|
|
||
|
/// \brief Safely left shift values when undefined behavior could occur
|
||
|
/// \tparam bits the number of bit positions to shift the value
|
||
|
/// \tparam T class or type
|
||
|
/// \param value the value to left shift
|
||
|
/// \result the shifted value or 0
|
||
|
/// \details SafeLeftShift safely shifts the value to the left when undefined behavior
|
||
|
/// could occur under C/C++ rules. SafeLeftShift will return the shifted value or 0
|
||
|
/// if undefined behavior would occur.
|
||
|
template <unsigned int bits, class T>
|
||
|
inline T SafeLeftShift(T value)
|
||
|
{
|
||
|
return SafeShifter<(bits>=(8*sizeof(T)))>::LeftShift(value, bits);
|
||
|
}
|
||
|
|
||
|
/// \brief Finds first element not in a range
|
||
|
/// \tparam InputIt Input iterator type
|
||
|
/// \tparam T class or type
|
||
|
/// \param first iterator to first element
|
||
|
/// \param last iterator to last element
|
||
|
/// \param value the value used as a predicate
|
||
|
/// \returns iterator to the first element in the range that is not value
|
||
|
template<typename InputIt, typename T>
|
||
|
inline InputIt FindIfNot(InputIt first, InputIt last, const T &value) {
|
||
|
#ifdef CRYPTOPP_CXX11_LAMBDA
|
||
|
return std::find_if(first, last, [&value](const T &o) {
|
||
|
return value!=o;
|
||
|
});
|
||
|
#else
|
||
|
return std::find_if(first, last, std::bind2nd(std::not_equal_to<T>(), value));
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
// ************** use one buffer for multiple data members ***************
|
||
|
|
||
|
#define CRYPTOPP_BLOCK_1(n, t, s) t* m_##n() {return (t *)(void *)(m_aggregate+0);} size_t SS1() {return sizeof(t)*(s);} size_t m_##n##Size() {return (s);}
|
||
|
#define CRYPTOPP_BLOCK_2(n, t, s) t* m_##n() {return (t *)(void *)(m_aggregate+SS1());} size_t SS2() {return SS1()+sizeof(t)*(s);} size_t m_##n##Size() {return (s);}
|
||
|
#define CRYPTOPP_BLOCK_3(n, t, s) t* m_##n() {return (t *)(void *)(m_aggregate+SS2());} size_t SS3() {return SS2()+sizeof(t)*(s);} size_t m_##n##Size() {return (s);}
|
||
|
#define CRYPTOPP_BLOCK_4(n, t, s) t* m_##n() {return (t *)(void *)(m_aggregate+SS3());} size_t SS4() {return SS3()+sizeof(t)*(s);} size_t m_##n##Size() {return (s);}
|
||
|
#define CRYPTOPP_BLOCK_5(n, t, s) t* m_##n() {return (t *)(void *)(m_aggregate+SS4());} size_t SS5() {return SS4()+sizeof(t)*(s);} size_t m_##n##Size() {return (s);}
|
||
|
#define CRYPTOPP_BLOCK_6(n, t, s) t* m_##n() {return (t *)(void *)(m_aggregate+SS5());} size_t SS6() {return SS5()+sizeof(t)*(s);} size_t m_##n##Size() {return (s);}
|
||
|
#define CRYPTOPP_BLOCK_7(n, t, s) t* m_##n() {return (t *)(void *)(m_aggregate+SS6());} size_t SS7() {return SS6()+sizeof(t)*(s);} size_t m_##n##Size() {return (s);}
|
||
|
#define CRYPTOPP_BLOCK_8(n, t, s) t* m_##n() {return (t *)(void *)(m_aggregate+SS7());} size_t SS8() {return SS7()+sizeof(t)*(s);} size_t m_##n##Size() {return (s);}
|
||
|
#define CRYPTOPP_BLOCKS_END(i) size_t SST() {return SS##i();} void AllocateBlocks() {m_aggregate.New(SST());} AlignedSecByteBlock m_aggregate;
|
||
|
|
||
|
NAMESPACE_END
|
||
|
|
||
|
#if (CRYPTOPP_MSC_VERSION)
|
||
|
# pragma warning(pop)
|
||
|
#endif
|
||
|
|
||
|
#if CRYPTOPP_GCC_DIAGNOSTIC_AVAILABLE
|
||
|
# pragma GCC diagnostic pop
|
||
|
#endif
|
||
|
|
||
|
#endif
|