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123 lines
4.5 KiB
123 lines
4.5 KiB
// ccm.h - originally written and placed in the public domain by Wei Dai |
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/// \file ccm.h |
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/// \brief CCM block cipher mode of operation |
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/// \since Crypto++ 5.6.0 |
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#ifndef CRYPTOPP_CCM_H |
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#define CRYPTOPP_CCM_H |
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#include "authenc.h" |
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#include "modes.h" |
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NAMESPACE_BEGIN(CryptoPP) |
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/// \brief CCM block cipher base implementation |
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/// \details Base implementation of the AuthenticatedSymmetricCipher interface |
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/// \since Crypto++ 5.6.0 |
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class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CCM_Base : public AuthenticatedSymmetricCipherBase |
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{ |
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public: |
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CCM_Base() |
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: m_digestSize(0), m_L(0), m_messageLength(0), m_aadLength(0) {} |
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// AuthenticatedSymmetricCipher |
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std::string AlgorithmName() const |
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{return GetBlockCipher().AlgorithmName() + std::string("/CCM");} |
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std::string AlgorithmProvider() const |
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{return GetBlockCipher().AlgorithmProvider();} |
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size_t MinKeyLength() const |
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{return GetBlockCipher().MinKeyLength();} |
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size_t MaxKeyLength() const |
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{return GetBlockCipher().MaxKeyLength();} |
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size_t DefaultKeyLength() const |
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{return GetBlockCipher().DefaultKeyLength();} |
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size_t GetValidKeyLength(size_t keylength) const |
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{return GetBlockCipher().GetValidKeyLength(keylength);} |
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bool IsValidKeyLength(size_t keylength) const |
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{return GetBlockCipher().IsValidKeyLength(keylength);} |
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unsigned int OptimalDataAlignment() const |
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{return GetBlockCipher().OptimalDataAlignment();} |
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IV_Requirement IVRequirement() const |
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{return UNIQUE_IV;} |
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unsigned int IVSize() const |
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{return 8;} |
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unsigned int MinIVLength() const |
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{return 7;} |
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unsigned int MaxIVLength() const |
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{return 13;} |
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unsigned int DigestSize() const |
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{return m_digestSize;} |
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lword MaxHeaderLength() const |
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{return W64LIT(0)-1;} |
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lword MaxMessageLength() const |
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{return m_L<8 ? (W64LIT(1)<<(8*m_L))-1 : W64LIT(0)-1;} |
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bool NeedsPrespecifiedDataLengths() const |
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{return true;} |
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void UncheckedSpecifyDataLengths(lword headerLength, lword messageLength, lword footerLength); |
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protected: |
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// AuthenticatedSymmetricCipherBase |
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bool AuthenticationIsOnPlaintext() const |
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{return true;} |
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unsigned int AuthenticationBlockSize() const |
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{return GetBlockCipher().BlockSize();} |
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void SetKeyWithoutResync(const byte *userKey, size_t keylength, const NameValuePairs ¶ms); |
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void Resync(const byte *iv, size_t len); |
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size_t AuthenticateBlocks(const byte *data, size_t len); |
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void AuthenticateLastHeaderBlock(); |
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void AuthenticateLastConfidentialBlock(); |
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void AuthenticateLastFooterBlock(byte *mac, size_t macSize); |
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SymmetricCipher & AccessSymmetricCipher() {return m_ctr;} |
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virtual BlockCipher & AccessBlockCipher() =0; |
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virtual int DefaultDigestSize() const =0; |
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const BlockCipher & GetBlockCipher() const {return const_cast<CCM_Base *>(this)->AccessBlockCipher();} |
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byte *CBC_Buffer() {return m_buffer+REQUIRED_BLOCKSIZE;} |
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enum {REQUIRED_BLOCKSIZE = 16}; |
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int m_digestSize, m_L; |
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word64 m_messageLength, m_aadLength; |
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CTR_Mode_ExternalCipher::Encryption m_ctr; |
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}; |
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/// \brief CCM block cipher final implementation |
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/// \tparam T_BlockCipher block cipher |
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/// \tparam T_DefaultDigestSize default digest size, in bytes |
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/// \tparam T_IsEncryption direction in which to operate the cipher |
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/// \since Crypto++ 5.6.0 |
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template <class T_BlockCipher, int T_DefaultDigestSize, bool T_IsEncryption> |
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class CCM_Final : public CCM_Base |
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{ |
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public: |
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static std::string StaticAlgorithmName() |
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{return T_BlockCipher::StaticAlgorithmName() + std::string("/CCM");} |
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bool IsForwardTransformation() const |
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{return T_IsEncryption;} |
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private: |
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BlockCipher & AccessBlockCipher() {return m_cipher;} |
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int DefaultDigestSize() const {return T_DefaultDigestSize;} |
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typename T_BlockCipher::Encryption m_cipher; |
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}; |
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/// \brief CCM block cipher mode of operation |
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/// \tparam T_BlockCipher block cipher |
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/// \tparam T_DefaultDigestSize default digest size, in bytes |
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/// \details \p CCM provides the \p Encryption and \p Decryption typedef. See GCM_Base |
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/// and GCM_Final for the AuthenticatedSymmetricCipher implementation. |
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/// \sa <a href="http://www.cryptopp.com/wiki/CCM_Mode">CCM Mode</a> and |
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/// <A HREF="http://www.cryptopp.com/wiki/Modes_of_Operation">Modes of Operation</A> |
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/// on the Crypto++ wiki. |
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/// \since Crypto++ 5.6.0 |
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template <class T_BlockCipher, int T_DefaultDigestSize = 16> |
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struct CCM : public AuthenticatedSymmetricCipherDocumentation |
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{ |
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typedef CCM_Final<T_BlockCipher, T_DefaultDigestSize, true> Encryption; |
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typedef CCM_Final<T_BlockCipher, T_DefaultDigestSize, false> Decryption; |
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}; |
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NAMESPACE_END |
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#endif
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