mirror of
https://github.com/shadps4-emu/ext-cryptopp.git
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211 lines
7.5 KiB
C++
211 lines
7.5 KiB
C++
// chacha.cpp - written and placed in the public domain by Jeffrey Walton.
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// Based on Wei Dai's Salsa20 and Bernstein's reference ChaCha
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// family implementation at http://cr.yp.to/chacha.html.
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#include "pch.h"
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#include "config.h"
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#include "chacha.h"
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#include "argnames.h"
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#include "misc.h"
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#include "cpu.h"
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NAMESPACE_BEGIN(CryptoPP)
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#if (CRYPTOPP_ARM_NEON_AVAILABLE)
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extern void ChaCha_OperateKeystream_NEON(const word32 *state, const byte* input, byte *output, unsigned int rounds);
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#endif
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#if (CRYPTOPP_SSE2_INTRIN_AVAILABLE || CRYPTOPP_SSE2_ASM_AVAILABLE)
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extern void ChaCha_OperateKeystream_SSE2(const word32 *state, const byte* input, byte *output, unsigned int rounds);
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#endif
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#define CHACHA_QUARTER_ROUND(a,b,c,d) \
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a += b; d ^= a; d = rotlConstant<16,word32>(d); \
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c += d; b ^= c; b = rotlConstant<12,word32>(b); \
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a += b; d ^= a; d = rotlConstant<8,word32>(d); \
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c += d; b ^= c; b = rotlConstant<7,word32>(b);
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#if defined(CRYPTOPP_DEBUG) && !defined(CRYPTOPP_DOXYGEN_PROCESSING)
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void ChaCha_TestInstantiations()
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{
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ChaCha::Encryption x;
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}
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#endif
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std::string ChaCha_Policy::AlgorithmName() const
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{
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return std::string("ChaCha")+IntToString(m_rounds);
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}
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std::string ChaCha_Policy::AlgorithmProvider() const
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{
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#if (CRYPTOPP_SSE2_INTRIN_AVAILABLE || CRYPTOPP_SSE2_ASM_AVAILABLE)
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if (HasSSE2())
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return "SSE2";
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#endif
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#if (CRYPTOPP_ARM_NEON_AVAILABLE)
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if (HasNEON())
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return "NEON";
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#endif
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return "C++";
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}
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void ChaCha_Policy::CipherSetKey(const NameValuePairs ¶ms, const byte *key, size_t length)
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{
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CRYPTOPP_UNUSED(params);
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CRYPTOPP_ASSERT(length == 16 || length == 32);
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m_rounds = params.GetIntValueWithDefault(Name::Rounds(), 20);
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if (!(m_rounds == 8 || m_rounds == 12 || m_rounds == 20))
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throw InvalidRounds(ChaCha::StaticAlgorithmName(), m_rounds);
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// "expand 16-byte k" or "expand 32-byte k"
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m_state[0] = 0x61707865;
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m_state[1] = (length == 16) ? 0x3120646e : 0x3320646e;
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m_state[2] = (length == 16) ? 0x79622d36 : 0x79622d32;
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m_state[3] = 0x6b206574;
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GetBlock<word32, LittleEndian> get1(key);
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get1(m_state[4])(m_state[5])(m_state[6])(m_state[7]);
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GetBlock<word32, LittleEndian> get2(key + ((length == 32) ? 16 : 0));
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get2(m_state[8])(m_state[9])(m_state[10])(m_state[11]);
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}
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void ChaCha_Policy::CipherResynchronize(byte *keystreamBuffer, const byte *IV, size_t length)
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{
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CRYPTOPP_UNUSED(keystreamBuffer), CRYPTOPP_UNUSED(length);
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CRYPTOPP_ASSERT(length==8);
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GetBlock<word32, LittleEndian> get(IV);
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m_state[12] = m_state[13] = 0;
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get(m_state[14])(m_state[15]);
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}
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void ChaCha_Policy::SeekToIteration(lword iterationCount)
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{
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m_state[13] = (word32)iterationCount;
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m_state[12] = (word32)SafeRightShift<32>(iterationCount);
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}
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unsigned int ChaCha_Policy::GetAlignment() const
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{
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#if (CRYPTOPP_SSE2_INTRIN_AVAILABLE || CRYPTOPP_SSE2_ASM_AVAILABLE)
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if (HasSSE2())
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return 16;
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else
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#endif
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return GetAlignmentOf<word32>();
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}
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unsigned int ChaCha_Policy::GetOptimalBlockSize() const
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{
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#if (CRYPTOPP_SSE2_INTRIN_AVAILABLE || CRYPTOPP_SSE2_ASM_AVAILABLE)
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if (HasSSE2())
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return 4*BYTES_PER_ITERATION;
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else
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#endif
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#if (CRYPTOPP_ARM_NEON_AVAILABLE)
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if (HasNEON())
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return 4*BYTES_PER_ITERATION;
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else
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#endif
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return BYTES_PER_ITERATION;
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}
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// OperateKeystream always produces a key stream. The key stream is written
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// to output. Optionally a message may be supplied to xor with the key stream.
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// The message is input, and output = output ^ input.
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void ChaCha_Policy::OperateKeystream(KeystreamOperation operation,
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byte *output, const byte *input, size_t iterationCount)
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{
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#if (CRYPTOPP_SSE2_INTRIN_AVAILABLE || CRYPTOPP_SSE2_ASM_AVAILABLE)
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if (HasSSE2())
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{
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while (iterationCount >= 4)
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{
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const bool xorInput = (operation & INPUT_NULL) != INPUT_NULL;
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ChaCha_OperateKeystream_SSE2(m_state, xorInput ? input : NULLPTR, output, m_rounds);
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m_state[12] += 4;
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if (m_state[12] < 4)
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m_state[13]++;
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input += (!!xorInput)*4*BYTES_PER_ITERATION;
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output += 4*BYTES_PER_ITERATION;
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iterationCount -= 4;
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}
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}
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#endif
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#if (CRYPTOPP_ARM_NEON_AVAILABLE)
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if (HasNEON())
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{
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while (iterationCount >= 4)
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{
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const bool xorInput = (operation & INPUT_NULL) != INPUT_NULL;
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ChaCha_OperateKeystream_NEON(m_state, xorInput ? input : NULLPTR, output, m_rounds);
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m_state[12] += 4;
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if (m_state[12] < 4)
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m_state[13]++;
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input += (!!xorInput)*4*BYTES_PER_ITERATION;
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output += 4*BYTES_PER_ITERATION;
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iterationCount -= 4;
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}
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}
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#endif
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while (iterationCount--)
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{
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word32 x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15;
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x0 = m_state[0]; x1 = m_state[1]; x2 = m_state[2]; x3 = m_state[3];
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x4 = m_state[4]; x5 = m_state[5]; x6 = m_state[6]; x7 = m_state[7];
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x8 = m_state[8]; x9 = m_state[9]; x10 = m_state[10]; x11 = m_state[11];
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x12 = m_state[12]; x13 = m_state[13]; x14 = m_state[14]; x15 = m_state[15];
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for (int i = static_cast<int>(m_rounds); i > 0; i -= 2)
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{
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CHACHA_QUARTER_ROUND(x0, x4, x8, x12);
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CHACHA_QUARTER_ROUND(x1, x5, x9, x13);
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CHACHA_QUARTER_ROUND(x2, x6, x10, x14);
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CHACHA_QUARTER_ROUND(x3, x7, x11, x15);
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CHACHA_QUARTER_ROUND(x0, x5, x10, x15);
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CHACHA_QUARTER_ROUND(x1, x6, x11, x12);
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CHACHA_QUARTER_ROUND(x2, x7, x8, x13);
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CHACHA_QUARTER_ROUND(x3, x4, x9, x14);
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}
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#ifndef CRYPTOPP_DOXYGEN_PROCESSING
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#define CHACHA_OUTPUT(x){\
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CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 0, x0 + m_state[0]);\
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CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 1, x1 + m_state[1]);\
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CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 2, x2 + m_state[2]);\
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CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 3, x3 + m_state[3]);\
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CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 4, x4 + m_state[4]);\
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CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 5, x5 + m_state[5]);\
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CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 6, x6 + m_state[6]);\
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CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 7, x7 + m_state[7]);\
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CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 8, x8 + m_state[8]);\
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CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 9, x9 + m_state[9]);\
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CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 10, x10 + m_state[10]);\
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CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 11, x11 + m_state[11]);\
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CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 12, x12 + m_state[12]);\
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CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 13, x13 + m_state[13]);\
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CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 14, x14 + m_state[14]);\
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CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 15, x15 + m_state[15]);}
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CRYPTOPP_KEYSTREAM_OUTPUT_SWITCH(CHACHA_OUTPUT, BYTES_PER_ITERATION);
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#undef CHACHA_OUTPUT
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#endif
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if (++m_state[12] == 0)
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m_state[13]++;
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}
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}
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NAMESPACE_END
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