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author | weidai <weidai@57ff6487-cd31-0410-9ec3-f628ee90f5f0> | 2006-12-09 17:18:13 +0000 |
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committer | weidai <weidai@57ff6487-cd31-0410-9ec3-f628ee90f5f0> | 2006-12-09 17:18:13 +0000 |
commit | e553818e00684e8905ede16e53aa490c153b7e7a (patch) | |
tree | 6b3af3bcbac76ed5587c17adfe5399fd2059378e /salsa.h | |
parent | bbd05f8142921b590d6493ff37983fa687aa90e3 (diff) | |
download | cryptopp-e553818e00684e8905ede16e53aa490c153b7e7a.tar.gz |
add Salsa20 cipher
git-svn-id: svn://svn.code.sf.net/p/cryptopp/code/trunk/c5@247 57ff6487-cd31-0410-9ec3-f628ee90f5f0
Diffstat (limited to 'salsa.h')
-rwxr-xr-x | salsa.h | 43 |
1 files changed, 43 insertions, 0 deletions
@@ -0,0 +1,43 @@ +// salsa.h - written and placed in the public domain by Wei Dai + +#ifndef CRYPTOPP_SALSA_H +#define CRYPTOPP_SALSA_H + +#include "strciphr.h" + +NAMESPACE_BEGIN(CryptoPP) + +//! _ +struct Salsa20_Info : public VariableKeyLength<32, 16, 32, 16, SimpleKeyingInterface::STRUCTURED_IV> +{ + static const char *StaticAlgorithmName() {return "Salsa20";} +}; + +class CRYPTOPP_NO_VTABLE Salsa20_Policy : public AdditiveCipherConcretePolicy<word32, 16>, public Salsa20_Info +{ +public: + unsigned int IVSize() const {return 8;} + void GetNextIV(byte *IV) const; + +protected: + void CipherSetKey(const NameValuePairs ¶ms, const byte *key, size_t length); + void OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount); + void CipherResynchronize(byte *keystreamBuffer, const byte *IV); + bool IsRandomAccess() const {return true;} + void SeekToIteration(lword iterationCount); + +private: + int m_rounds; + FixedSizeSecBlock<word32, 16> m_state; +}; + +//! Salsa20, variable rounds: 8, 12 or 20 (default 20) +struct Salsa20 : public Salsa20_Info, public SymmetricCipherDocumentation +{ + typedef SymmetricCipherFinal<ConcretePolicyHolder<Salsa20_Policy, AdditiveCipherTemplate<> >, Salsa20_Info> Encryption; + typedef Encryption Decryption; +}; + +NAMESPACE_END + +#endif |