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Diffstat (limited to 'lib/cryptopp/ccm.h')
| -rw-r--r-- | lib/cryptopp/ccm.h | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/lib/cryptopp/ccm.h b/lib/cryptopp/ccm.h new file mode 100644 index 000000000..b1e5f00b9 --- /dev/null +++ b/lib/cryptopp/ccm.h @@ -0,0 +1,101 @@ +#ifndef CRYPTOPP_CCM_H +#define CRYPTOPP_CCM_H + +#include "authenc.h" +#include "modes.h" + +NAMESPACE_BEGIN(CryptoPP) + +//! . +class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CCM_Base : public AuthenticatedSymmetricCipherBase +{ +public: + CCM_Base() + : m_digestSize(0), m_L(0) {} + + // AuthenticatedSymmetricCipher + std::string AlgorithmName() const + {return GetBlockCipher().AlgorithmName() + std::string("/CCM");} + size_t MinKeyLength() const + {return GetBlockCipher().MinKeyLength();} + size_t MaxKeyLength() const + {return GetBlockCipher().MaxKeyLength();} + size_t DefaultKeyLength() const + {return GetBlockCipher().DefaultKeyLength();} + size_t GetValidKeyLength(size_t n) const + {return GetBlockCipher().GetValidKeyLength(n);} + bool IsValidKeyLength(size_t n) const + {return GetBlockCipher().IsValidKeyLength(n);} + unsigned int OptimalDataAlignment() const + {return GetBlockCipher().OptimalDataAlignment();} + IV_Requirement IVRequirement() const + {return UNIQUE_IV;} + unsigned int IVSize() const + {return 8;} + unsigned int MinIVLength() const + {return 7;} + unsigned int MaxIVLength() const + {return 13;} + unsigned int DigestSize() const + {return m_digestSize;} + lword MaxHeaderLength() const + {return W64LIT(0)-1;} + lword MaxMessageLength() const + {return m_L<8 ? (W64LIT(1)<<(8*m_L))-1 : W64LIT(0)-1;} + bool NeedsPrespecifiedDataLengths() const + {return true;} + void UncheckedSpecifyDataLengths(lword headerLength, lword messageLength, lword footerLength); + +protected: + // AuthenticatedSymmetricCipherBase + bool AuthenticationIsOnPlaintext() const + {return true;} + unsigned int AuthenticationBlockSize() const + {return GetBlockCipher().BlockSize();} + void SetKeyWithoutResync(const byte *userKey, size_t keylength, const NameValuePairs ¶ms); + void Resync(const byte *iv, size_t len); + size_t AuthenticateBlocks(const byte *data, size_t len); + void AuthenticateLastHeaderBlock(); + void AuthenticateLastConfidentialBlock(); + void AuthenticateLastFooterBlock(byte *mac, size_t macSize); + SymmetricCipher & AccessSymmetricCipher() {return m_ctr;} + + virtual BlockCipher & AccessBlockCipher() =0; + virtual int DefaultDigestSize() const =0; + + const BlockCipher & GetBlockCipher() const {return const_cast<CCM_Base *>(this)->AccessBlockCipher();}; + byte *CBC_Buffer() {return m_buffer+REQUIRED_BLOCKSIZE;} + + enum {REQUIRED_BLOCKSIZE = 16}; + int m_digestSize, m_L; + word64 m_messageLength, m_aadLength; + CTR_Mode_ExternalCipher::Encryption m_ctr; +}; + +//! . +template <class T_BlockCipher, int T_DefaultDigestSize, bool T_IsEncryption> +class CCM_Final : public CCM_Base +{ +public: + static std::string StaticAlgorithmName() + {return T_BlockCipher::StaticAlgorithmName() + std::string("/CCM");} + bool IsForwardTransformation() const + {return T_IsEncryption;} + +private: + BlockCipher & AccessBlockCipher() {return m_cipher;} + int DefaultDigestSize() const {return T_DefaultDigestSize;} + typename T_BlockCipher::Encryption m_cipher; +}; + +/// <a href="http://www.cryptolounge.org/wiki/CCM">CCM</a> +template <class T_BlockCipher, int T_DefaultDigestSize = 16> +struct CCM : public AuthenticatedSymmetricCipherDocumentation +{ + typedef CCM_Final<T_BlockCipher, T_DefaultDigestSize, true> Encryption; + typedef CCM_Final<T_BlockCipher, T_DefaultDigestSize, false> Decryption; +}; + +NAMESPACE_END + +#endif |