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123 lines
4.3 KiB
C++
123 lines
4.3 KiB
C++
// ccm.h - 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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//! \class CCM_Base
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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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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 n) const
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{return GetBlockCipher().GetValidKeyLength(n);}
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bool IsValidKeyLength(size_t n) const
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{return GetBlockCipher().IsValidKeyLength(n);}
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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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//! \class CCM_Final
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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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//! \class CCM
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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.cryptolounge.org/wiki/CCM">CCM</a> at the Crypto Lounge
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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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