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panama.h

00001 #ifndef CRYPTOPP_PANAMA_H 00002 #define CRYPTOPP_PANAMA_H 00003 00004 #include "seckey.h" 00005 #include "secblock.h" 00006 #include "iterhash.h" 00007 #include "strciphr.h" 00008 00009 NAMESPACE_BEGIN(CryptoPP) 00010 00011 /// base class, do not use directly 00012 template <class B> 00013 class CRYPTOPP_NO_VTABLE Panama 00014 { 00015 public: 00016 void Reset(); 00017 void Iterate(unsigned int count, const word32 *p=NULL, word32 *z=NULL, const word32 *y=NULL); 00018 00019 protected: 00020 typedef word32 Stage[8]; 00021 enum {STAGES = 32}; 00022 00023 FixedSizeSecBlock<word32, 17*2 + STAGES*sizeof(Stage)> m_state; 00024 unsigned int m_bstart; 00025 }; 00026 00027 /// <a href="http://www.weidai.com/scan-mirror/md.html#Panama">Panama Hash</a> 00028 template <class B = LittleEndian> 00029 class PanamaHash : protected Panama<B>, public AlgorithmImpl<IteratedHash<word32, NativeByteOrder, 32>, PanamaHash<B> > 00030 { 00031 public: 00032 enum {DIGESTSIZE = 32}; 00033 PanamaHash() {Panama<B>::Reset();} 00034 unsigned int DigestSize() const {return DIGESTSIZE;} 00035 void TruncatedFinal(byte *hash, unsigned int size); 00036 static const char * StaticAlgorithmName() {return B::ToEnum() == BIG_ENDIAN_ORDER ? "Panama-BE" : "Panama-LE";} 00037 00038 protected: 00039 void Init() {Panama<B>::Reset();} 00040 void HashEndianCorrectedBlock(const word32 *data) {this->Iterate(1, data);} // push 00041 unsigned int HashMultipleBlocks(const word32 *input, unsigned int length); 00042 }; 00043 00044 //! MAC construction using a hermetic hash function 00045 template <class T_Hash, class T_Info = T_Hash> 00046 class HermeticHashFunctionMAC : public AlgorithmImpl<SimpleKeyingInterfaceImpl<TwoBases<MessageAuthenticationCode, VariableKeyLength<32, 0, UINT_MAX> > >, T_Info> 00047 { 00048 public: 00049 void SetKey(const byte *key, unsigned int length, const NameValuePairs &params = g_nullNameValuePairs) 00050 { 00051 m_key.Assign(key, length); 00052 Restart(); 00053 } 00054 00055 void Restart() 00056 { 00057 m_hash.Restart(); 00058 m_keyed = false; 00059 } 00060 00061 void Update(const byte *input, unsigned int length) 00062 { 00063 if (!m_keyed) 00064 KeyHash(); 00065 m_hash.Update(input, length); 00066 } 00067 00068 void TruncatedFinal(byte *digest, unsigned int digestSize) 00069 { 00070 if (!m_keyed) 00071 KeyHash(); 00072 m_hash.TruncatedFinal(digest, digestSize); 00073 m_keyed = false; 00074 } 00075 00076 unsigned int DigestSize() const 00077 {return m_hash.DigestSize();} 00078 unsigned int BlockSize() const 00079 {return m_hash.BlockSize();} 00080 unsigned int OptimalBlockSize() const 00081 {return m_hash.OptimalBlockSize();} 00082 unsigned int OptimalDataAlignment() const 00083 {return m_hash.OptimalDataAlignment();} 00084 00085 protected: 00086 void KeyHash() 00087 { 00088 m_hash.Update(m_key, m_key.size()); 00089 m_keyed = true; 00090 } 00091 00092 T_Hash m_hash; 00093 bool m_keyed; 00094 SecByteBlock m_key; 00095 }; 00096 00097 /// Panama MAC 00098 template <class B = LittleEndian> 00099 class PanamaMAC : public HermeticHashFunctionMAC<PanamaHash<B> > 00100 { 00101 public: 00102 PanamaMAC() {} 00103 PanamaMAC(const byte *key, unsigned int length) 00104 {this->SetKey(key, length);} 00105 }; 00106 00107 //! algorithm info 00108 template <class B> 00109 struct PanamaCipherInfo : public VariableKeyLength<32, 32, 64, 32, SimpleKeyingInterface::NOT_RESYNCHRONIZABLE> 00110 { 00111 static const char * StaticAlgorithmName() {return B::ToEnum() == BIG_ENDIAN_ORDER ? "Panama-BE" : "Panama-LE";} 00112 }; 00113 00114 //! _ 00115 template <class B> 00116 class PanamaCipherPolicy : public AdditiveCipherConcretePolicy<word32, 8>, 00117 public PanamaCipherInfo<B>, 00118 protected Panama<B> 00119 { 00120 protected: 00121 void CipherSetKey(const NameValuePairs &params, const byte *key, unsigned int length); 00122 void OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, unsigned int iterationCount); 00123 bool IsRandomAccess() const {return false;} 00124 }; 00125 00126 //! <a href="http://www.weidai.com/scan-mirror/cs.html#Panama">Panama Stream Cipher</a> 00127 template <class B = LittleEndian> 00128 struct PanamaCipher : public PanamaCipherInfo<B>, public SymmetricCipherDocumentation 00129 { 00130 typedef SymmetricCipherFinal<ConcretePolicyHolder<PanamaCipherPolicy<B>, AdditiveCipherTemplate<> > > Encryption; 00131 typedef Encryption Decryption; 00132 }; 00133 00134 NAMESPACE_END 00135 00136 #endif

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