mirror of
https://github.com/shadps4-emu/ext-cryptopp.git
synced 2024-11-23 18:09:48 +00:00
74 lines
3.1 KiB
C++
74 lines
3.1 KiB
C++
// chacha.h - written and placed in the public domain by Jeffrey Walton.
|
|
// Copyright assigned to the Crypto++ project.
|
|
// Based on Wei Dai's Salsa20 and Bernstein's reference ChaCha
|
|
// family implementation at http://cr.yp.to/chacha.html.
|
|
|
|
//! \file chacha.h
|
|
//! \brief Classes for ChaCha8, ChaCha12 and ChaCha20 stream ciphers
|
|
|
|
#ifndef CRYPTOPP_CHACHA_H
|
|
#define CRYPTOPP_CHACHA_H
|
|
|
|
#include "strciphr.h"
|
|
#include "secblock.h"
|
|
|
|
NAMESPACE_BEGIN(CryptoPP)
|
|
|
|
//! \class ChaCha_Info
|
|
//! \brief ChaCha stream cipher information
|
|
template <unsigned int R>
|
|
struct ChaCha_Info : public VariableKeyLength<32, 16, 32, 16, SimpleKeyingInterface::UNIQUE_IV, 8>, public FixedRounds<R>
|
|
{
|
|
static const char *StaticAlgorithmName() {static const std::string name = "ChaCha" + IntToString(R); return name.c_str();}
|
|
};
|
|
|
|
//! \class ChaCha_Policy
|
|
//! \brief ChaCha stream cipher implementation
|
|
template <unsigned int R>
|
|
class CRYPTOPP_NO_VTABLE ChaCha_Policy : public AdditiveCipherConcretePolicy<word32, 16>
|
|
{
|
|
protected:
|
|
CRYPTOPP_CONSTANT(ROUNDS=FixedRounds<R>::ROUNDS)
|
|
|
|
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, size_t length);
|
|
bool CipherIsRandomAccess() const {return false;} // TODO
|
|
void SeekToIteration(lword iterationCount);
|
|
unsigned int GetAlignment() const;
|
|
unsigned int GetOptimalBlockSize() const;
|
|
|
|
FixedSizeAlignedSecBlock<word32, 16> m_state;
|
|
};
|
|
|
|
//! \class ChaCha8
|
|
//! \brief ChaCha8 stream cipher
|
|
//! \sa <a href="http://cr.yp.to/chacha/chacha-20080128.pdf">ChaCha, a variant of Salsa20</a> (2008.01.28).
|
|
struct ChaCha8 : public ChaCha_Info<8>, public SymmetricCipherDocumentation
|
|
{
|
|
typedef SymmetricCipherFinal<ConcretePolicyHolder<ChaCha_Policy<8>, AdditiveCipherTemplate<> >, ChaCha_Info<8> > Encryption;
|
|
typedef SymmetricCipherFinal<ConcretePolicyHolder<ChaCha_Policy<8>, AdditiveCipherTemplate<> >, ChaCha_Info<8> > Decryption;
|
|
};
|
|
|
|
//! \class ChaCha12
|
|
//! \brief ChaCha12 stream cipher
|
|
//! \sa <a href="http://cr.yp.to/chacha/chacha-20080128.pdf">ChaCha, a variant of Salsa20</a> (2008.01.28).
|
|
struct ChaCha12 : public ChaCha_Info<12>, public SymmetricCipherDocumentation
|
|
{
|
|
typedef SymmetricCipherFinal<ConcretePolicyHolder<ChaCha_Policy<12>, AdditiveCipherTemplate<> >, ChaCha_Info<12> > Encryption;
|
|
typedef SymmetricCipherFinal<ConcretePolicyHolder<ChaCha_Policy<12>, AdditiveCipherTemplate<> >, ChaCha_Info<12> > Decryption;
|
|
};
|
|
|
|
//! \class ChaCha20
|
|
//! \brief ChaCha20 stream cipher
|
|
//! \sa <a href="http://cr.yp.to/chacha/chacha-20080128.pdf">ChaCha, a variant of Salsa20</a> (2008.01.28).
|
|
struct ChaCha20 : public ChaCha_Info<20>, public SymmetricCipherDocumentation
|
|
{
|
|
typedef SymmetricCipherFinal<ConcretePolicyHolder<ChaCha_Policy<20>, AdditiveCipherTemplate<> >, ChaCha_Info<20> > Encryption;
|
|
typedef SymmetricCipherFinal<ConcretePolicyHolder<ChaCha_Policy<20>, AdditiveCipherTemplate<> >, ChaCha_Info<20> > Decryption;
|
|
};
|
|
|
|
NAMESPACE_END
|
|
|
|
#endif // CRYPTOPP_CHACHA_H
|