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-rw-r--r--CryptoPP/ccm.h101
1 files changed, 101 insertions, 0 deletions
diff --git a/CryptoPP/ccm.h b/CryptoPP/ccm.h
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+++ b/CryptoPP/ccm.h
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+#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 &params);
+ 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