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# salsa.h

    00001 // salsa.h - written and placed in the public domain by Wei Dai
    00002
    00003 #ifndef CRYPTOPP_SALSA_H
    00004 #define CRYPTOPP_SALSA_H
    00005
    00006 #include "strciphr.h"
    00007
    00008 NAMESPACE_BEGIN(CryptoPP)
    00009
    00010 //! _
    00011 struct Salsa20_Info : public VariableKeyLength<32, 16, 32, 16, SimpleKeyingInterface::UNIQUE_IV, 8>
    00012 {
    00013         static const char *StaticAlgorithmName() {return "Salsa20";}
    00014 };
    00015
    00016 class CRYPTOPP_NO_VTABLE Salsa20_Policy : public AdditiveCipherConcretePolicy<word32, 16>, public Salsa20_Info
    00017 {
    00018 protected:
    00019         void CipherSetKey(const NameValuePairs &params, const byte *key, size_t length);
    00020         void OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount);
    00021         void CipherResynchronize(byte *keystreamBuffer, const byte *IV);
    00022         bool IsRandomAccess() const {return true;}
    00023         void SeekToIteration(lword iterationCount);
    00024 #if CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_X64
    00025         unsigned int GetAlignment() const;
    00026         unsigned int GetOptimalBlockSize() const;
    00027 #endif
    00028
    00029 private:
    00030         FixedSizeAlignedSecBlock<word32, 16> m_state;
    00031         int m_rounds;
    00032 };
    00033
    00034 /// <a href="http://www.cryptolounge.org/wiki/Salsa20">Salsa20</a>, variable rounds: 8, 12 or 20 (default 20)
    00035 struct Salsa20 : public Salsa20_Info, public SymmetricCipherDocumentation
    00036 {
    00037         typedef SymmetricCipherFinal<ConcretePolicyHolder<Salsa20_Policy, AdditiveCipherTemplate<> >, Salsa20_Info> Encryption;
    00038         typedef Encryption Decryption;
    00039 };
    00040
    00041 NAMESPACE_END
    00042
    00043 #endif