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// 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
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