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368 lines
15 KiB
368 lines
15 KiB
![]()
4 years ago
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// cham.cpp - written and placed in the public domain by Kim Sung Hee and Jeffrey Walton
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// Based on "CHAM: A Family of Lightweight Block Ciphers for
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// Resource-Constrained Devices" by Bonwook Koo, Dongyoung Roh,
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// Hyeonjin Kim, Younghoon Jung, Dong-Geon Lee, and Daesung Kwon
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#include "pch.h"
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#include "config.h"
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#include "cham.h"
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#include "misc.h"
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#include "cpu.h"
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// CHAM table of parameters
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// +-------------------------------------------------
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// +cipher n k r w k/w
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// +-------------------------------------------------
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// +CHAM-64/128 64 128 80 16 8
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// +CHAM-128/128 128 128 80 32 4
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// +CHAM-128/256 128 256 96 32 8
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// +-------------------------------------------------
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ANONYMOUS_NAMESPACE_BEGIN
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using CryptoPP::rotlConstant;
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using CryptoPP::rotrConstant;
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/// \brief CHAM encryption round
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/// \tparam RR the round number residue
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/// \tparam KW the number of key words
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/// \tparam T words type
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/// \param x the state array
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/// \param k the subkey table
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/// \param i the round number
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/// \details CHAM_EncRound applies the encryption round to the plain text.
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/// RR is the "round residue" and it is used modulo 4. ProcessAndXorBlock
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/// may provide a fully unrolled encryption transformation, or provide
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/// a transformation that loops using multiples of 4 encryption rounds.
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/// \details CHAM_EncRound calculates indexes into the x[] array based
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/// on the round number residue. There is no need for the assignments
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/// that shift values in preparations for the next round.
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/// \details CHAM_EncRound depends on the round number. The actual round
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/// being executed is passed through the parameter <tt>i</tt>. If
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/// ProcessAndXorBlock fully unrolled the loop then the parameter
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/// <tt>i</tt> would be unnecessary.
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template <unsigned int RR, unsigned int KW, class T>
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inline void CHAM_EncRound(T x[4], const T k[KW], unsigned int i)
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{
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CRYPTOPP_CONSTANT(IDX0 = (RR+0) % 4);
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CRYPTOPP_CONSTANT(IDX1 = (RR+1) % 4);
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CRYPTOPP_CONSTANT(IDX3 = (RR+3+1) % 4);
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CRYPTOPP_CONSTANT(R1 = (RR % 2 == 0) ? 1 : 8);
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CRYPTOPP_CONSTANT(R2 = (RR % 2 == 0) ? 8 : 1);
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// Follows conventions in the ref impl
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const T kk = k[i % KW];
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const T aa = x[IDX0] ^ static_cast<T>(i);
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const T bb = rotlConstant<R1>(x[IDX1]) ^ kk;
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x[IDX3] = rotlConstant<R2>(static_cast<T>(aa + bb));
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}
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/// \brief CHAM decryption round
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/// \tparam RR the round number residue
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/// \tparam KW the number of key words
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/// \tparam T words type
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/// \param x the state array
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/// \param k the subkey table
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/// \param i the round number
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/// \details CHAM_DecRound applies the decryption round to the cipher text.
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/// RR is the "round residue" and it is used modulo 4. ProcessAndXorBlock
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/// may provide a fully unrolled decryption transformation, or provide
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/// a transformation that loops using multiples of 4 decryption rounds.
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/// \details CHAM_DecRound calculates indexes into the x[] array based
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/// on the round number residue. There is no need for the assignments
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/// that shift values in preparations for the next round.
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/// \details CHAM_DecRound depends on the round number. The actual round
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/// being executed is passed through the parameter <tt>i</tt>. If
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/// ProcessAndXorBlock fully unrolled the loop then the parameter
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/// <tt>i</tt> would be unnecessary.
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template <unsigned int RR, unsigned int KW, class T>
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inline void CHAM_DecRound(T x[4], const T k[KW], unsigned int i)
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{
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CRYPTOPP_CONSTANT(IDX0 = (RR+0) % 4);
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CRYPTOPP_CONSTANT(IDX1 = (RR+1) % 4);
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CRYPTOPP_CONSTANT(IDX3 = (RR+3+1) % 4);
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CRYPTOPP_CONSTANT(R1 = (RR % 2 == 0) ? 8 : 1);
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CRYPTOPP_CONSTANT(R2 = (RR % 2 == 0) ? 1 : 8);
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// Follows conventions in the ref impl
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const T kk = k[i % KW];
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const T aa = rotrConstant<R1>(x[IDX3]);
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const T bb = rotlConstant<R2>(x[IDX1]) ^ kk;
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x[IDX0] = static_cast<T>(aa - bb) ^ static_cast<T>(i);
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}
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ANONYMOUS_NAMESPACE_END
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NAMESPACE_BEGIN(CryptoPP)
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#if CRYPTOPP_CHAM128_ADVANCED_PROCESS_BLOCKS
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# if (CRYPTOPP_SSSE3_AVAILABLE)
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extern size_t CHAM64_Enc_AdvancedProcessBlocks_SSSE3(const word16* subKeys, size_t rounds,
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const byte *inBlocks, const byte *xorBlocks, byte *outBlocks, size_t length, word32 flags);
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extern size_t CHAM64_Dec_AdvancedProcessBlocks_SSSE3(const word16* subKeys, size_t rounds,
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const byte *inBlocks, const byte *xorBlocks, byte *outBlocks, size_t length, word32 flags);
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extern size_t CHAM128_Enc_AdvancedProcessBlocks_SSSE3(const word32* subKeys, size_t rounds,
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const byte *inBlocks, const byte *xorBlocks, byte *outBlocks, size_t length, word32 flags);
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extern size_t CHAM128_Dec_AdvancedProcessBlocks_SSSE3(const word32* subKeys, size_t rounds,
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const byte *inBlocks, const byte *xorBlocks, byte *outBlocks, size_t length, word32 flags);
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# endif // CRYPTOPP_SSSE3_AVAILABLE
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#endif // CRYPTOPP_CHAM128_ADVANCED_PROCESS_BLOCKS
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std::string CHAM64::Base::AlgorithmProvider() const
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{
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#if (CRYPTOPP_CHAM128_ADVANCED_PROCESS_BLOCKS)
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# if defined(CRYPTOPP_SSSE3_AVAILABLE)
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if (HasSSSE3())
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return "SSSE3";
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# endif
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#endif
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return "C++";
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}
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void CHAM64::Base::UncheckedSetKey(const byte *userKey, unsigned int keyLength, const NameValuePairs ¶ms)
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{
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CRYPTOPP_UNUSED(params);
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m_kw = keyLength/sizeof(word16);
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m_rk.New(2*m_kw);
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for (size_t i = 0; i < m_kw; ++i, userKey += sizeof(word16))
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{
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// Do not cast the buffer. It will SIGBUS on some ARM and SPARC.
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const word16 rk = GetWord<word16>(false, BIG_ENDIAN_ORDER, userKey);
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m_rk[i] = rk ^ rotlConstant<1>(rk) ^ rotlConstant<8>(rk);
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m_rk[(i + m_kw) ^ 1] = rk ^ rotlConstant<1>(rk) ^ rotlConstant<11>(rk);
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}
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}
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void CHAM64::Enc::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
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{
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// Do not cast the buffer. It will SIGBUS on some ARM and SPARC.
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GetBlock<word16, BigEndian> iblock(inBlock);
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iblock(m_x[0])(m_x[1])(m_x[2])(m_x[3]);
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const int R = 80;
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for (int i = 0; i < R; i+=16)
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{
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CHAM_EncRound< 0, 16>(m_x.begin(), m_rk.begin(), i+0);
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CHAM_EncRound< 1, 16>(m_x.begin(), m_rk.begin(), i+1);
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CHAM_EncRound< 2, 16>(m_x.begin(), m_rk.begin(), i+2);
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CHAM_EncRound< 3, 16>(m_x.begin(), m_rk.begin(), i+3);
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CHAM_EncRound< 4, 16>(m_x.begin(), m_rk.begin(), i+4);
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CHAM_EncRound< 5, 16>(m_x.begin(), m_rk.begin(), i+5);
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CHAM_EncRound< 6, 16>(m_x.begin(), m_rk.begin(), i+6);
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CHAM_EncRound< 7, 16>(m_x.begin(), m_rk.begin(), i+7);
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CHAM_EncRound< 8, 16>(m_x.begin(), m_rk.begin(), i+8);
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CHAM_EncRound< 9, 16>(m_x.begin(), m_rk.begin(), i+9);
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CHAM_EncRound<10, 16>(m_x.begin(), m_rk.begin(), i+10);
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CHAM_EncRound<11, 16>(m_x.begin(), m_rk.begin(), i+11);
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CHAM_EncRound<12, 16>(m_x.begin(), m_rk.begin(), i+12);
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CHAM_EncRound<13, 16>(m_x.begin(), m_rk.begin(), i+13);
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CHAM_EncRound<14, 16>(m_x.begin(), m_rk.begin(), i+14);
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CHAM_EncRound<15, 16>(m_x.begin(), m_rk.begin(), i+15);
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}
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PutBlock<word16, BigEndian> oblock(xorBlock, outBlock);
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oblock(m_x[0])(m_x[1])(m_x[2])(m_x[3]);
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}
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void CHAM64::Dec::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
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{
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// Do not cast the buffer. It will SIGBUS on some ARM and SPARC.
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GetBlock<word16, BigEndian> iblock(inBlock);
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iblock(m_x[0])(m_x[1])(m_x[2])(m_x[3]);
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const int R = 80;
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for (int i = R-1; i >=0 ; i-=16)
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{
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CHAM_DecRound<15, 16>(m_x.begin(), m_rk.begin(), i-0);
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CHAM_DecRound<14, 16>(m_x.begin(), m_rk.begin(), i-1);
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CHAM_DecRound<13, 16>(m_x.begin(), m_rk.begin(), i-2);
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CHAM_DecRound<12, 16>(m_x.begin(), m_rk.begin(), i-3);
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CHAM_DecRound<11, 16>(m_x.begin(), m_rk.begin(), i-4);
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CHAM_DecRound<10, 16>(m_x.begin(), m_rk.begin(), i-5);
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CHAM_DecRound< 9, 16>(m_x.begin(), m_rk.begin(), i-6);
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CHAM_DecRound< 8, 16>(m_x.begin(), m_rk.begin(), i-7);
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CHAM_DecRound< 7, 16>(m_x.begin(), m_rk.begin(), i-8);
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CHAM_DecRound< 6, 16>(m_x.begin(), m_rk.begin(), i-9);
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CHAM_DecRound< 5, 16>(m_x.begin(), m_rk.begin(), i-10);
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CHAM_DecRound< 4, 16>(m_x.begin(), m_rk.begin(), i-11);
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CHAM_DecRound< 3, 16>(m_x.begin(), m_rk.begin(), i-12);
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CHAM_DecRound< 2, 16>(m_x.begin(), m_rk.begin(), i-13);
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CHAM_DecRound< 1, 16>(m_x.begin(), m_rk.begin(), i-14);
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CHAM_DecRound< 0, 16>(m_x.begin(), m_rk.begin(), i-15);
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}
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PutBlock<word16, BigEndian> oblock(xorBlock, outBlock);
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oblock(m_x[0])(m_x[1])(m_x[2])(m_x[3]);
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}
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std::string CHAM128::Base::AlgorithmProvider() const
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{
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#if defined(CRYPTOPP_SSSE3_AVAILABLE)
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if (HasSSSE3())
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return "SSSE3";
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#endif
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return "C++";
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}
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void CHAM128::Base::UncheckedSetKey(const byte *userKey, unsigned int keyLength, const NameValuePairs ¶ms)
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{
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CRYPTOPP_UNUSED(params);
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m_kw = keyLength/sizeof(word32);
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m_rk.New(2*m_kw);
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for (size_t i = 0; i < m_kw; ++i, userKey += sizeof(word32))
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{
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// Do not cast the buffer. It will SIGBUS on some ARM and SPARC.
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const word32 rk = GetWord<word32>(false, BIG_ENDIAN_ORDER, userKey);
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m_rk[i] = rk ^ rotlConstant<1>(rk) ^ rotlConstant<8>(rk);
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m_rk[(i + m_kw) ^ 1] = rk ^ rotlConstant<1>(rk) ^ rotlConstant<11>(rk);
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}
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}
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void CHAM128::Enc::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
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{
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// Do not cast the buffer. It will SIGBUS on some ARM and SPARC.
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GetBlock<word32, BigEndian> iblock(inBlock);
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iblock(m_x[0])(m_x[1])(m_x[2])(m_x[3]);
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switch (m_kw)
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{
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case 4: // 128-bit key
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{
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const int R = 80;
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for (int i = 0; i < R; i+=8)
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{
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CHAM_EncRound<0, 8>(m_x.begin(), m_rk.begin(), i+0);
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CHAM_EncRound<1, 8>(m_x.begin(), m_rk.begin(), i+1);
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CHAM_EncRound<2, 8>(m_x.begin(), m_rk.begin(), i+2);
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CHAM_EncRound<3, 8>(m_x.begin(), m_rk.begin(), i+3);
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CHAM_EncRound<4, 8>(m_x.begin(), m_rk.begin(), i+4);
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CHAM_EncRound<5, 8>(m_x.begin(), m_rk.begin(), i+5);
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CHAM_EncRound<6, 8>(m_x.begin(), m_rk.begin(), i+6);
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CHAM_EncRound<7, 8>(m_x.begin(), m_rk.begin(), i+7);
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}
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break;
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}
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case 8: // 256-bit key
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{
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const int R = 96;
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for (int i = 0; i < R; i+=16)
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{
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CHAM_EncRound< 0, 16>(m_x.begin(), m_rk.begin(), i+0);
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CHAM_EncRound< 1, 16>(m_x.begin(), m_rk.begin(), i+1);
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CHAM_EncRound< 2, 16>(m_x.begin(), m_rk.begin(), i+2);
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CHAM_EncRound< 3, 16>(m_x.begin(), m_rk.begin(), i+3);
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CHAM_EncRound< 4, 16>(m_x.begin(), m_rk.begin(), i+4);
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CHAM_EncRound< 5, 16>(m_x.begin(), m_rk.begin(), i+5);
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CHAM_EncRound< 6, 16>(m_x.begin(), m_rk.begin(), i+6);
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CHAM_EncRound< 7, 16>(m_x.begin(), m_rk.begin(), i+7);
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CHAM_EncRound< 8, 16>(m_x.begin(), m_rk.begin(), i+8);
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CHAM_EncRound< 9, 16>(m_x.begin(), m_rk.begin(), i+9);
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CHAM_EncRound<10, 16>(m_x.begin(), m_rk.begin(), i+10);
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CHAM_EncRound<11, 16>(m_x.begin(), m_rk.begin(), i+11);
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CHAM_EncRound<12, 16>(m_x.begin(), m_rk.begin(), i+12);
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CHAM_EncRound<13, 16>(m_x.begin(), m_rk.begin(), i+13);
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CHAM_EncRound<14, 16>(m_x.begin(), m_rk.begin(), i+14);
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CHAM_EncRound<15, 16>(m_x.begin(), m_rk.begin(), i+15);
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}
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break;
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}
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default:
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CRYPTOPP_ASSERT(0);
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}
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PutBlock<word32, BigEndian> oblock(xorBlock, outBlock);
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oblock(m_x[0])(m_x[1])(m_x[2])(m_x[3]);
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}
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void CHAM128::Dec::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
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{
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// Do not cast the buffer. It will SIGBUS on some ARM and SPARC.
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GetBlock<word32, BigEndian> iblock(inBlock);
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iblock(m_x[0])(m_x[1])(m_x[2])(m_x[3]);
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switch (m_kw)
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{
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case 4: // 128-bit key
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{
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const int R = 80;
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for (int i = R-1; i >= 0; i-=8)
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{
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CHAM_DecRound<7, 8>(m_x.begin(), m_rk.begin(), i-0);
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CHAM_DecRound<6, 8>(m_x.begin(), m_rk.begin(), i-1);
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CHAM_DecRound<5, 8>(m_x.begin(), m_rk.begin(), i-2);
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CHAM_DecRound<4, 8>(m_x.begin(), m_rk.begin(), i-3);
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CHAM_DecRound<3, 8>(m_x.begin(), m_rk.begin(), i-4);
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CHAM_DecRound<2, 8>(m_x.begin(), m_rk.begin(), i-5);
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CHAM_DecRound<1, 8>(m_x.begin(), m_rk.begin(), i-6);
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CHAM_DecRound<0, 8>(m_x.begin(), m_rk.begin(), i-7);
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}
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break;
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}
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case 8: // 256-bit key
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{
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const int R = 96;
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for (int i = R-1; i >= 0; i-=16)
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{
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CHAM_DecRound<15, 16>(m_x.begin(), m_rk.begin(), i-0);
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CHAM_DecRound<14, 16>(m_x.begin(), m_rk.begin(), i-1);
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CHAM_DecRound<13, 16>(m_x.begin(), m_rk.begin(), i-2);
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CHAM_DecRound<12, 16>(m_x.begin(), m_rk.begin(), i-3);
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CHAM_DecRound<11, 16>(m_x.begin(), m_rk.begin(), i-4);
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CHAM_DecRound<10, 16>(m_x.begin(), m_rk.begin(), i-5);
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CHAM_DecRound< 9, 16>(m_x.begin(), m_rk.begin(), i-6);
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CHAM_DecRound< 8, 16>(m_x.begin(), m_rk.begin(), i-7);
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CHAM_DecRound< 7, 16>(m_x.begin(), m_rk.begin(), i-8);
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CHAM_DecRound< 6, 16>(m_x.begin(), m_rk.begin(), i-9);
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CHAM_DecRound< 5, 16>(m_x.begin(), m_rk.begin(), i-10);
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CHAM_DecRound< 4, 16>(m_x.begin(), m_rk.begin(), i-11);
|
||
|
CHAM_DecRound< 3, 16>(m_x.begin(), m_rk.begin(), i-12);
|
||
|
CHAM_DecRound< 2, 16>(m_x.begin(), m_rk.begin(), i-13);
|
||
|
CHAM_DecRound< 1, 16>(m_x.begin(), m_rk.begin(), i-14);
|
||
|
CHAM_DecRound< 0, 16>(m_x.begin(), m_rk.begin(), i-15);
|
||
|
}
|
||
|
break;
|
||
|
}
|
||
|
default:
|
||
|
CRYPTOPP_ASSERT(0);
|
||
|
}
|
||
|
|
||
|
PutBlock<word32, BigEndian> oblock(xorBlock, outBlock);
|
||
|
oblock(m_x[0])(m_x[1])(m_x[2])(m_x[3]);
|
||
|
}
|
||
|
|
||
|
#if CRYPTOPP_CHAM128_ADVANCED_PROCESS_BLOCKS
|
||
|
size_t CHAM128::Enc::AdvancedProcessBlocks(const byte *inBlocks, const byte *xorBlocks,
|
||
|
byte *outBlocks, size_t length, word32 flags) const
|
||
|
{
|
||
|
# if (CRYPTOPP_SSSE3_AVAILABLE)
|
||
|
if (HasSSSE3()) {
|
||
|
const size_t rounds = (m_kw == 4 ? 80 : 96);
|
||
|
return CHAM128_Enc_AdvancedProcessBlocks_SSSE3(m_rk, rounds,
|
||
|
inBlocks, xorBlocks, outBlocks, length, flags);
|
||
|
}
|
||
|
# endif // CRYPTOPP_SSSE3_AVAILABLE
|
||
|
return BlockTransformation::AdvancedProcessBlocks(inBlocks, xorBlocks, outBlocks, length, flags);
|
||
|
}
|
||
|
|
||
|
size_t CHAM128::Dec::AdvancedProcessBlocks(const byte *inBlocks, const byte *xorBlocks,
|
||
|
byte *outBlocks, size_t length, word32 flags) const
|
||
|
{
|
||
|
# if (CRYPTOPP_SSSE3_AVAILABLE)
|
||
|
if (HasSSSE3()) {
|
||
|
const size_t rounds = (m_kw == 4 ? 80 : 96);
|
||
|
return CHAM128_Dec_AdvancedProcessBlocks_SSSE3(m_rk, rounds,
|
||
|
inBlocks, xorBlocks, outBlocks, length, flags);
|
||
|
}
|
||
|
# endif // CRYPTOPP_SSSE3_AVAILABLE
|
||
|
return BlockTransformation::AdvancedProcessBlocks(inBlocks, xorBlocks, outBlocks, length, flags);
|
||
|
}
|
||
|
#endif // CRYPTOPP_CHAM128_ADVANCED_PROCESS_BLOCKS
|
||
|
|
||
|
NAMESPACE_END
|