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Merge 9796e7a903 into 7b901f8edc

pull/157/merge
DevJPM 2016-06-05 14:22:00 +00:00
parent 7b901f8edc 9796e7a903
commit 794cf790c9
2 changed files with 60 additions and 31 deletions
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33
chacha.cpp
View File

@ -27,11 +27,17 @@ void ChaCha_TestInstantiations()
}
#endif
template <unsigned int R>
void ChaCha_Policy<R>::CipherSetKey(const NameValuePairs &params, const byte *key, size_t length)
void ChaCha_Policy::CipherSetKey(const NameValuePairs &params, const byte *key, size_t length)
{
CRYPTOPP_UNUSED(params);
m_rounds = params.GetIntValueWithDefault(Name::Rounds(), 20);
if (!(m_rounds == 8 || m_rounds == 12 || m_rounds == 20))
throw InvalidRounds(ChaCha::StaticAlgorithmName(), m_rounds);
<<<<<<< HEAD
assert(length == 16 || length == 32);
=======
>>>>>>> origin/ChaCha-VarRounds
// "expand 16-byte k" or "expand 32-byte k"
m_state[0] = 0x61707865;
@ -46,8 +52,7 @@ void ChaCha_Policy<R>::CipherSetKey(const NameValuePairs &params, const byte *ke
get2(m_state[8])(m_state[9])(m_state[10])(m_state[11]);
}
template <unsigned int R>
void ChaCha_Policy<R>::CipherResynchronize(byte *keystreamBuffer, const byte *IV, size_t length)
void ChaCha_Policy::CipherResynchronize(byte *keystreamBuffer, const byte *IV, size_t length)
{
CRYPTOPP_UNUSED(keystreamBuffer), CRYPTOPP_UNUSED(length);
assert(length==8);
@ -57,11 +62,10 @@ void ChaCha_Policy<R>::CipherResynchronize(byte *keystreamBuffer, const byte *IV
get(m_state[14])(m_state[15]);
}
template<unsigned int R>
void ChaCha_Policy<R>::SeekToIteration(lword iterationCount)
void ChaCha_Policy::SeekToIteration(lword iterationCount)
{
CRYPTOPP_UNUSED(iterationCount);
throw NotImplemented(std::string(ChaCha_Info<R>::StaticAlgorithmName()) + ": SeekToIteration is not yet implemented");
throw NotImplemented(std::string(ChaCha_Info::StaticAlgorithmName()) + ": SeekToIteration is not yet implemented");
// TODO: these were Salsa20, and Wei re-arranged the state array for SSE2 operations.
// If we can generate some out-of-band test vectors, then test and implement. Also
@ -70,8 +74,7 @@ void ChaCha_Policy<R>::SeekToIteration(lword iterationCount)
// m_state[5] = (word32)SafeRightShift<32>(iterationCount);
}
template<unsigned int R>
unsigned int ChaCha_Policy<R>::GetAlignment() const
unsigned int ChaCha_Policy::GetAlignment() const
{
#if CRYPTOPP_BOOL_SSE2_ASM_AVAILABLE && 0
if (HasSSE2())
@ -81,8 +84,7 @@ unsigned int ChaCha_Policy<R>::GetAlignment() const
return GetAlignmentOf<word32>();
}
template<unsigned int R>
unsigned int ChaCha_Policy<R>::GetOptimalBlockSize() const
unsigned int ChaCha_Policy::GetOptimalBlockSize() const
{
#if CRYPTOPP_BOOL_SSE2_ASM_AVAILABLE && 0
if (HasSSE2())
@ -92,8 +94,7 @@ unsigned int ChaCha_Policy<R>::GetOptimalBlockSize() const
return BYTES_PER_ITERATION;
}
template<unsigned int R>
void ChaCha_Policy<R>::OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount)
void ChaCha_Policy::OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount)
{
word32 x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15;
@ -104,7 +105,7 @@ void ChaCha_Policy<R>::OperateKeystream(KeystreamOperation operation, byte *outp
x8 = m_state[8]; x9 = m_state[9]; x10 = m_state[10]; x11 = m_state[11];
x12 = m_state[12]; x13 = m_state[13]; x14 = m_state[14]; x15 = m_state[15];
for (int i = static_cast<int>(ROUNDS); i > 0; i -= 2)
for (int i = static_cast<int>(m_rounds); i > 0; i -= 2)
{
CHACHA_QUARTER_ROUND(x0, x4, x8, x12);
CHACHA_QUARTER_ROUND(x1, x5, x9, x13);
@ -145,9 +146,11 @@ void ChaCha_Policy<R>::OperateKeystream(KeystreamOperation operation, byte *outp
}
}
/*
template class ChaCha_Policy<8>;
template class ChaCha_Policy<12>;
template class ChaCha_Policy<20>;
*/
NAMESPACE_END

54
chacha.h
View File

@ -4,32 +4,37 @@
// family implementation at http://cr.yp.to/chacha.html.
//! \file chacha.h
//! \brief Classes for ChaCha8, ChaCha12 and ChaCha20 stream ciphers
//! \brief Classes for the ChaCha family of stream ciphers
#ifndef CRYPTOPP_CHACHA_H
#define CRYPTOPP_CHACHA_H
#include "strciphr.h"
#include "secblock.h"
#include "algparam.h" // for MakeParameters()
NAMESPACE_BEGIN(CryptoPP)
//! \class ChaCha_Info
//! \brief ChaCha stream cipher information
struct ChaCha_Info : public VariableKeyLength<32, 16, 32, 16, SimpleKeyingInterface::UNIQUE_IV, 8>
{
static const char *StaticAlgorithmName() {static const std::string name = "ChaCha"; return name.c_str();}
};
//! \class ChaChaFR_Info
//! \brief ChaCha stream cipher information for compile-time fixed rounds
template<unsigned int R>
struct ChaCha_Info : public VariableKeyLength<32, 16, 32, 16, SimpleKeyingInterface::UNIQUE_IV, 8>, public FixedRounds<R>
struct ChaChaFR_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 &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);
@ -39,33 +44,54 @@ protected:
unsigned int GetOptimalBlockSize() const;
FixedSizeAlignedSecBlock<word32, 16> m_state;
unsigned int m_rounds;
};
//! \class ChaCha_Policy
//! \brief ChaCha stream cipher implementation for fixed rounds
template<unsigned int R>
class CRYPTOPP_NO_VTABLE ChaChaFR_Policy : public ChaCha_Policy
{
protected:
CRYPTOPP_CONSTANT(ROUNDS = FixedRounds<R>::ROUNDS);
void CipherSetKey(const NameValuePairs &params, const byte *key, size_t length) { CRYPTOPP_UNUSED(params); ChaCha_Policy::CipherSetKey(MakeParameters(Name::Rounds(), ROUNDS), key, length); }
};
//! \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
struct ChaCha8 : public ChaChaFR_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;
typedef SymmetricCipherFinal<ConcretePolicyHolder<ChaChaFR_Policy<8>, AdditiveCipherTemplate<> >, ChaChaFR_Info<8> > Encryption;
typedef Encryption 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
struct ChaCha12 : public ChaChaFR_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;
typedef SymmetricCipherFinal<ConcretePolicyHolder<ChaChaFR_Policy<12>, AdditiveCipherTemplate<> >, ChaChaFR_Info<12> > Encryption;
typedef Encryption 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
struct ChaCha20 : public ChaChaFR_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;
typedef SymmetricCipherFinal<ConcretePolicyHolder<ChaChaFR_Policy<20>, AdditiveCipherTemplate<> >, ChaChaFR_Info<20> > Encryption;
typedef Encryption Decryption;
};
//! \class ChaCha
//! \brief ChaCha stream cipher
//! \sa <a href="http://cr.yp.to/chacha/chacha-20080128.pdf">ChaCha, a variant of Salsa20</a> (2008.01.28).
struct ChaCha : public ChaCha_Info, public SymmetricCipherDocumentation
{
typedef SymmetricCipherFinal<ConcretePolicyHolder<ChaCha_Policy, AdditiveCipherTemplate<> >, ChaCha_Info > Encryption;
typedef Encryption Decryption;
};
NAMESPACE_END