salsa.h
// 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::UNIQUE_IV, 8>
{
static const char *StaticAlgorithmName() {return "Salsa20";}
};
class CRYPTOPP_NO_VTABLE Salsa20_Policy : public AdditiveCipherConcretePolicy<word32, 16>
{
protected:
void CipherSetKey(const NameValuePairs &params, 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, size_t length);
bool CipherIsRandomAccess() const {return true;}
void SeekToIteration(lword iterationCount);
#if CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_X64
unsigned int GetAlignment() const;
unsigned int GetOptimalBlockSize() const;
#endif
FixedSizeAlignedSecBlock<word32, 16> m_state;
int m_rounds;
};
/// <a href="http://www.cryptolounge.org/wiki/Salsa20">Salsa20</a>, 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;
};
//! _
struct XSalsa20_Info : public FixedKeyLength<32, SimpleKeyingInterface::UNIQUE_IV, 24>
{
static const char *StaticAlgorithmName() {return "XSalsa20";}
};
class CRYPTOPP_NO_VTABLE XSalsa20_Policy : public Salsa20_Policy
{
public:
void CipherSetKey(const NameValuePairs &params, const byte *key, size_t length);
void CipherResynchronize(byte *keystreamBuffer, const byte *IV, size_t length);
protected:
FixedSizeSecBlock<word32, 8> m_key;
};
/// <a href="http://www.cryptolounge.org/wiki/XSalsa20">XSalsa20</a>, variable rounds: 8, 12 or 20 (default 20)
struct XSalsa20 : public XSalsa20_Info, public SymmetricCipherDocumentation
{
typedef SymmetricCipherFinal<ConcretePolicyHolder<XSalsa20_Policy, AdditiveCipherTemplate<> >, XSalsa20_Info> Encryption;
typedef Encryption Decryption;
};
NAMESPACE_END
#endif
FixedKeyLength
to be inherited by keyed algorithms with fixed key length
Definition: seckey.h:66
AdditiveCipherConcretePolicy
Definition: strciphr.h:84
XSalsa20_Info
_
Definition: salsa.h:41
Salsa20_Info
_
Definition: salsa.h:11
XSalsa20
XSalsa20, variable rounds: 8, 12 or 20 (default 20)
Definition: salsa.h:57
XSalsa20_Policy
Definition: salsa.h:46
SimpleKeyingInterface
keying interface for crypto algorithms that take byte strings as keys
Definition: cryptlib.h:346
FixedSizeAlignedSecBlock< word32, 16 >
FixedSizeSecBlock< word32, 8 >
VariableKeyLength
support query of variable key length, template parameters are default, min, max, multiple (default mu...
Definition: seckey.h:80
strciphr.h
SymmetricCipherDocumentation
Each class derived from this one defines two types, Encryption and Decryption, both of which implemen...
Definition: seckey.h:201
Salsa20
Salsa20, variable rounds: 8, 12 or 20 (default 20)
Definition: salsa.h:34
SymmetricCipherFinal
_
Definition: strciphr.h:278
Salsa20_Policy
Definition: salsa.h:16
NameValuePairs
interface for retrieving values given their names
Definition: cryptlib.h:224