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ccm.h

00001 #ifndef CRYPTOPP_CCM_H
00002 #define CRYPTOPP_CCM_H
00003 
00004 #include "authenc.h"
00005 #include "modes.h"
00006 
00007 NAMESPACE_BEGIN(CryptoPP)
00008 
00009 //! .
00010 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CCM_Base : public AuthenticatedSymmetricCipherBase
00011 {
00012 public:
00013     CCM_Base()
00014         : m_digestSize(0), m_L(0) {}
00015 
00016     // AuthenticatedSymmetricCipher
00017     std::string AlgorithmName() const
00018         {return GetBlockCipher().AlgorithmName() + std::string("/CCM");}
00019     size_t MinKeyLength() const
00020         {return GetBlockCipher().MinKeyLength();}
00021     size_t MaxKeyLength() const
00022         {return GetBlockCipher().MaxKeyLength();}
00023     size_t DefaultKeyLength() const
00024         {return GetBlockCipher().DefaultKeyLength();}
00025     size_t GetValidKeyLength(size_t n) const
00026         {return GetBlockCipher().GetValidKeyLength(n);}
00027     bool IsValidKeyLength(size_t n) const
00028         {return GetBlockCipher().IsValidKeyLength(n);}
00029     unsigned int OptimalDataAlignment() const
00030         {return GetBlockCipher().OptimalDataAlignment();}
00031     IV_Requirement IVRequirement() const
00032         {return UNIQUE_IV;}
00033     unsigned int IVSize() const
00034         {return 8;}
00035     unsigned int MinIVLength() const
00036         {return 7;}
00037     unsigned int MaxIVLength() const
00038         {return 13;}
00039     unsigned int DigestSize() const
00040         {return m_digestSize;}
00041     lword MaxHeaderLength() const
00042         {return W64LIT(0)-1;}
00043     lword MaxMessageLength() const
00044         {return m_L<8 ? (W64LIT(1)<<(8*m_L))-1 : W64LIT(0)-1;}
00045     bool NeedsPrespecifiedDataLengths() const
00046         {return true;}
00047     void UncheckedSpecifyDataLengths(lword headerLength, lword messageLength, lword footerLength);
00048 
00049 protected:
00050     // AuthenticatedSymmetricCipherBase
00051     bool AuthenticationIsOnPlaintext() const
00052         {return true;}
00053     unsigned int AuthenticationBlockSize() const
00054         {return GetBlockCipher().BlockSize();}
00055     void SetKeyWithoutResync(const byte *userKey, size_t keylength, const NameValuePairs &params);
00056     void Resync(const byte *iv, size_t len);
00057     size_t AuthenticateBlocks(const byte *data, size_t len);
00058     void AuthenticateLastHeaderBlock();
00059     void AuthenticateLastConfidentialBlock();
00060     void AuthenticateLastFooterBlock(byte *mac, size_t macSize);
00061     SymmetricCipher & AccessSymmetricCipher() {return m_ctr;}
00062 
00063     virtual BlockCipher & AccessBlockCipher() =0;
00064     virtual int DefaultDigestSize() const =0;
00065 
00066     const BlockCipher & GetBlockCipher() const {return const_cast<CCM_Base *>(this)->AccessBlockCipher();};
00067     byte *CBC_Buffer() {return m_buffer+REQUIRED_BLOCKSIZE;}
00068 
00069     enum {REQUIRED_BLOCKSIZE = 16};
00070     int m_digestSize, m_L;
00071     word64 m_messageLength, m_aadLength;
00072     CTR_Mode_ExternalCipher::Encryption m_ctr;
00073 };
00074 
00075 //! .
00076 template <class T_BlockCipher, int T_DefaultDigestSize, bool T_IsEncryption>
00077 class CCM_Final : public CCM_Base
00078 {
00079 public:
00080     static std::string StaticAlgorithmName()
00081         {return T_BlockCipher::StaticAlgorithmName() + std::string("/CCM");}
00082     bool IsForwardTransformation() const
00083         {return T_IsEncryption;}
00084 
00085 private:
00086     BlockCipher & AccessBlockCipher() {return m_cipher;}
00087     int DefaultDigestSize() const {return T_DefaultDigestSize;}
00088     typename T_BlockCipher::Encryption m_cipher;
00089 };
00090 
00091 /// <a href="http://www.cryptolounge.org/wiki/CCM">CCM</a>
00092 template <class T_BlockCipher, int T_DefaultDigestSize = 16>
00093 struct CCM : public AuthenticatedSymmetricCipherDocumentation
00094 {
00095     typedef CCM_Final<T_BlockCipher, T_DefaultDigestSize, true> Encryption;
00096     typedef CCM_Final<T_BlockCipher, T_DefaultDigestSize, false> Decryption;
00097 };
00098 
00099 NAMESPACE_END
00100 
00101 #endif

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