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chacha.cpp
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// chacha.cpp - written and placed in the public domain by Jeffrey Walton.
// Based on Wei Dai's Salsa20, Botan's SSE2 implementation,
// and Bernstein's reference ChaCha family implementation at
// http://cr.yp.to/chacha.html.
#include "pch.h"
#include "config.h"
#include "chacha.h"
#include "argnames.h"
#include "misc.h"
#include "cpu.h"
// Internal compiler error in GCC 3.3 and below
#if defined(__GNUC__) && (__GNUC__ < 4)
# undef CRYPTOPP_SSE2_INTRIN_AVAILABLE
#endif
NAMESPACE_BEGIN(CryptoPP)
#if (CRYPTOPP_ARM_NEON_AVAILABLE)
extern void ChaCha_OperateKeystream_NEON(const word32 *state, const byte* input, byte *output, unsigned int rounds);
#endif
#if (CRYPTOPP_SSE2_INTRIN_AVAILABLE)
extern void ChaCha_OperateKeystream_SSE2(const word32 *state, const byte* input, byte *output, unsigned int rounds);
#endif
#if (CRYPTOPP_AVX2_AVAILABLE)
extern void ChaCha_OperateKeystream_AVX2(const word32 *state, const byte* input, byte *output, unsigned int rounds);
#endif
#if (CRYPTOPP_POWER7_AVAILABLE)
extern void ChaCha_OperateKeystream_POWER7(const word32 *state, const byte* input, byte *output, unsigned int rounds);
#elif (CRYPTOPP_ALTIVEC_AVAILABLE)
extern void ChaCha_OperateKeystream_ALTIVEC(const word32 *state, const byte* input, byte *output, unsigned int rounds);
#endif
#define CHACHA_QUARTER_ROUND(a,b,c,d) \
a += b; d ^= a; d = rotlConstant<16,word32>(d); \
c += d; b ^= c; b = rotlConstant<12,word32>(b); \
a += b; d ^= a; d = rotlConstant<8,word32>(d); \
c += d; b ^= c; b = rotlConstant<7,word32>(b);
#define CHACHA_OUTPUT(x){\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 0, x0 + m_state[0]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 1, x1 + m_state[1]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 2, x2 + m_state[2]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 3, x3 + m_state[3]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 4, x4 + m_state[4]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 5, x5 + m_state[5]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 6, x6 + m_state[6]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 7, x7 + m_state[7]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 8, x8 + m_state[8]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 9, x9 + m_state[9]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 10, x10 + m_state[10]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 11, x11 + m_state[11]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 12, x12 + m_state[12]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 13, x13 + m_state[13]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 14, x14 + m_state[14]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 15, x15 + m_state[15]);}
#if defined(CRYPTOPP_DEBUG) && !defined(CRYPTOPP_DOXYGEN_PROCESSING)
void ChaCha_TestInstantiations()
{
ChaCha::Encryption x;
}
#endif
std::string ChaCha_Policy::AlgorithmName() const
{
return std::string("ChaCha")+IntToString(m_rounds);
}
std::string ChaCha_Policy::AlgorithmProvider() const
{
#if (CRYPTOPP_AVX2_AVAILABLE)
if (HasAVX2())
return "AVX2";
else
#endif
#if (CRYPTOPP_SSE2_INTRIN_AVAILABLE)
if (HasSSE2())
return "SSE2";
else
#endif
#if (CRYPTOPP_ARM_NEON_AVAILABLE)
if (HasNEON())
return "NEON";
else
#endif
#if (CRYPTOPP_POWER7_AVAILABLE)
if (HasPower7())
return "Power7";
else
#elif (CRYPTOPP_ALTIVEC_AVAILABLE)
if (HasAltivec())
return "Altivec";
else
#endif
return "C++";
}
void ChaCha_Policy::CipherSetKey(const NameValuePairs ¶ms, const byte *key, size_t length)
{
CRYPTOPP_UNUSED(params);
CRYPTOPP_ASSERT(length == 16 || length == 32);
m_rounds = params.GetIntValueWithDefault(Name::Rounds(), 20);
if (!(m_rounds == 8 || m_rounds == 12 || m_rounds == 20))
throw InvalidRounds(ChaCha::StaticAlgorithmName(), m_rounds);
// "expand 16-byte k" or "expand 32-byte k"
m_state[0] = 0x61707865;
m_state[1] = (length == 16) ? 0x3120646e : 0x3320646e;
m_state[2] = (length == 16) ? 0x79622d36 : 0x79622d32;
m_state[3] = 0x6b206574;
GetBlock<word32, LittleEndian> get1(key);
get1(m_state[4])(m_state[5])(m_state[6])(m_state[7]);
GetBlock<word32, LittleEndian> get2(key + ((length == 32) ? 16 : 0));
get2(m_state[8])(m_state[9])(m_state[10])(m_state[11]);
}
void ChaCha_Policy::CipherResynchronize(byte *keystreamBuffer, const byte *IV, size_t length)
{
CRYPTOPP_UNUSED(keystreamBuffer), CRYPTOPP_UNUSED(length);
CRYPTOPP_ASSERT(length==8);
GetBlock<word32, LittleEndian> get(IV);
m_state[12] = m_state[13] = 0;
get(m_state[14])(m_state[15]);
}
void ChaCha_Policy::SeekToIteration(lword iterationCount)
{
m_state[12] = (word32)iterationCount; // low word
m_state[13] = (word32)SafeRightShift<32>(iterationCount);
}
unsigned int ChaCha_Policy::GetAlignment() const
{
#if (CRYPTOPP_AVX2_AVAILABLE)
if (HasAVX2())
return 16;
else
#endif
#if (CRYPTOPP_SSE2_INTRIN_AVAILABLE)
if (HasSSE2())
return 16;
else
#endif
#if (CRYPTOPP_ALTIVEC_AVAILABLE)
if (HasAltivec())
return 16;
else
#endif
return GetAlignmentOf<word32>();
}
unsigned int ChaCha_Policy::GetOptimalBlockSize() const
{
#if (CRYPTOPP_AVX2_AVAILABLE)
if (HasAVX2())
return 8 * BYTES_PER_ITERATION;
else
#endif
#if (CRYPTOPP_SSE2_INTRIN_AVAILABLE)
if (HasSSE2())
return 4*BYTES_PER_ITERATION;
else
#endif
#if (CRYPTOPP_ARM_NEON_AVAILABLE)
if (HasNEON())
return 4*BYTES_PER_ITERATION;
else
#endif
#if (CRYPTOPP_ALTIVEC_AVAILABLE)
if (HasAltivec())
return 4*BYTES_PER_ITERATION;
else
#endif
return BYTES_PER_ITERATION;
}
bool ChaCha_Policy::MultiBlockSafe(unsigned int blocks) const
{
return 0xffffffff - m_state[12] > blocks;
}
// OperateKeystream always produces a key stream. The key stream is written
// to output. Optionally a message may be supplied to xor with the key stream.
// The message is input, and output = output ^ input.
void ChaCha_Policy::OperateKeystream(KeystreamOperation operation,
byte *output, const byte *input, size_t iterationCount)
{
do
{
#if (CRYPTOPP_AVX2_AVAILABLE)
if (HasAVX2())
{
while (iterationCount >= 8 && MultiBlockSafe(8))
{
const bool xorInput = (operation & INPUT_NULL) != INPUT_NULL;
ChaCha_OperateKeystream_AVX2(m_state, xorInput ? input : NULLPTR, output, m_rounds);
// MultiBlockSafe avoids overflow on the counter words
m_state[12] += 8;
//if (m_state[12] < 8)
// m_state[13]++;
input += (!!xorInput) * 8 * BYTES_PER_ITERATION;
output += 8 * BYTES_PER_ITERATION;
iterationCount -= 8;
}
}
#endif
#if (CRYPTOPP_SSE2_INTRIN_AVAILABLE)
if (HasSSE2())
{
while (iterationCount >= 4 && MultiBlockSafe(4))
{
const bool xorInput = (operation & INPUT_NULL) != INPUT_NULL;
ChaCha_OperateKeystream_SSE2(m_state, xorInput ? input : NULLPTR, output, m_rounds);
// MultiBlockSafe avoids overflow on the counter words
m_state[12] += 4;
//if (m_state[12] < 4)
// m_state[13]++;
input += (!!xorInput)*4*BYTES_PER_ITERATION;
output += 4*BYTES_PER_ITERATION;
iterationCount -= 4;
}
}
#endif
#if (CRYPTOPP_ARM_NEON_AVAILABLE)
if (HasNEON())
{
while (iterationCount >= 4 && MultiBlockSafe(4))
{
const bool xorInput = (operation & INPUT_NULL) != INPUT_NULL;
ChaCha_OperateKeystream_NEON(m_state, xorInput ? input : NULLPTR, output, m_rounds);
// MultiBlockSafe avoids overflow on the counter words
m_state[12] += 4;
//if (m_state[12] < 4)
// m_state[13]++;
input += (!!xorInput)*4*BYTES_PER_ITERATION;
output += 4*BYTES_PER_ITERATION;
iterationCount -= 4;
}
}
#endif
#if (CRYPTOPP_POWER7_AVAILABLE)
if (HasPower7())
{
while (iterationCount >= 4 && MultiBlockSafe(4))
{
const bool xorInput = (operation & INPUT_NULL) != INPUT_NULL;
ChaCha_OperateKeystream_POWER7(m_state, xorInput ? input : NULLPTR, output, m_rounds);
// MultiBlockSafe avoids overflow on the counter words
m_state[12] += 4;
//if (m_state[12] < 4)
// m_state[13]++;
input += (!!xorInput)*4*BYTES_PER_ITERATION;
output += 4*BYTES_PER_ITERATION;
iterationCount -= 4;
}
}
#elif (CRYPTOPP_ALTIVEC_AVAILABLE)
if (HasAltivec())
{
while (iterationCount >= 4 && MultiBlockSafe(4))
{
const bool xorInput = (operation & INPUT_NULL) != INPUT_NULL;
ChaCha_OperateKeystream_ALTIVEC(m_state, xorInput ? input : NULLPTR, output, m_rounds);
// MultiBlockSafe avoids overflow on the counter words
m_state[12] += 4;
//if (m_state[12] < 4)
// m_state[13]++;
input += (!!xorInput)*4*BYTES_PER_ITERATION;
output += 4*BYTES_PER_ITERATION;
iterationCount -= 4;
}
}
#endif
if (iterationCount)
{
word32 x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15;
x0 = m_state[0]; x1 = m_state[1]; x2 = m_state[2]; x3 = m_state[3];
x4 = m_state[4]; x5 = m_state[5]; x6 = m_state[6]; x7 = m_state[7];
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>(m_rounds); i > 0; i -= 2)
{
CHACHA_QUARTER_ROUND(x0, x4, x8, x12);
CHACHA_QUARTER_ROUND(x1, x5, x9, x13);
CHACHA_QUARTER_ROUND(x2, x6, x10, x14);
CHACHA_QUARTER_ROUND(x3, x7, x11, x15);
CHACHA_QUARTER_ROUND(x0, x5, x10, x15);
CHACHA_QUARTER_ROUND(x1, x6, x11, x12);
CHACHA_QUARTER_ROUND(x2, x7, x8, x13);
CHACHA_QUARTER_ROUND(x3, x4, x9, x14);
}
CRYPTOPP_KEYSTREAM_OUTPUT_SWITCH(CHACHA_OUTPUT, BYTES_PER_ITERATION);
if (++m_state[12] == 0)
m_state[13]++;
}
// We may re-enter a SIMD keystream operation from here.
} while (iterationCount--);
}
NAMESPACE_END