14 #define CHACHA_QUARTER_ROUND(a,b,c,d) \ 15 a += b; d ^= a; d = rotlConstant<16,word32>(d); \ 16 c += d; b ^= c; b = rotlConstant<12,word32>(b); \ 17 a += b; d ^= a; d = rotlConstant<8,word32>(d); \ 18 c += d; b ^= c; b = rotlConstant<7,word32>(b); 20 #if defined(CRYPTOPP_DEBUG) && !defined(CRYPTOPP_DOXYGEN_PROCESSING) 21 void ChaCha_TestInstantiations()
29 template <
unsigned int R>
32 CRYPTOPP_UNUSED(params);
36 m_state[0] = 0x61707865;
37 m_state[1] = (length == 16) ? 0x3120646e : 0x3320646e;
38 m_state[2] = (length == 16) ? 0x79622d36 : 0x79622d32;
39 m_state[3] = 0x6b206574;
42 get1(m_state[4])(m_state[5])(m_state[6])(m_state[7]);
45 get2(m_state[8])(m_state[9])(m_state[10])(m_state[11]);
48 template <
unsigned int R>
51 CRYPTOPP_UNUSED(keystreamBuffer), CRYPTOPP_UNUSED(length);
55 m_state[12] = m_state[13] = 0;
56 get(m_state[14])(m_state[15]);
59 template<
unsigned int R>
62 CRYPTOPP_UNUSED(iterationCount);
72 template<
unsigned int R>
75 #if CRYPTOPP_SSE2_ASM_AVAILABLE && 0 80 return GetAlignmentOf<word32>();
83 template<
unsigned int R>
86 #if CRYPTOPP_SSE2_ASM_AVAILABLE && 0 88 return 4*BYTES_PER_ITERATION;
91 return BYTES_PER_ITERATION;
94 template<
unsigned int R>
97 word32 x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15;
99 while (iterationCount--)
101 x0 = m_state[0]; x1 = m_state[1]; x2 = m_state[2]; x3 = m_state[3];
102 x4 = m_state[4]; x5 = m_state[5]; x6 = m_state[6]; x7 = m_state[7];
103 x8 = m_state[8]; x9 = m_state[9]; x10 = m_state[10]; x11 = m_state[11];
104 x12 = m_state[12]; x13 = m_state[13]; x14 = m_state[14]; x15 = m_state[15];
106 for (
int i = static_cast<int>(ROUNDS); i > 0; i -= 2)
108 CHACHA_QUARTER_ROUND(x0, x4, x8, x12);
109 CHACHA_QUARTER_ROUND(x1, x5, x9, x13);
110 CHACHA_QUARTER_ROUND(x2, x6, x10, x14);
111 CHACHA_QUARTER_ROUND(x3, x7, x11, x15);
113 CHACHA_QUARTER_ROUND(x0, x5, x10, x15);
114 CHACHA_QUARTER_ROUND(x1, x6, x11, x12);
115 CHACHA_QUARTER_ROUND(x2, x7, x8, x13);
116 CHACHA_QUARTER_ROUND(x3, x4, x9, x14);
120 #define CHACHA_OUTPUT(x){\ 121 CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 0, x0 + m_state[0]);\ 122 CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 1, x1 + m_state[1]);\ 123 CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 2, x2 + m_state[2]);\ 124 CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 3, x3 + m_state[3]);\ 125 CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 4, x4 + m_state[4]);\ 126 CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 5, x5 + m_state[5]);\ 127 CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 6, x6 + m_state[6]);\ 128 CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 7, x7 + m_state[7]);\ 129 CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 8, x8 + m_state[8]);\ 130 CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 9, x9 + m_state[9]);\ 131 CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 10, x10 + m_state[10]);\ 132 CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 11, x11 + m_state[11]);\ 133 CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 12, x12 + m_state[12]);\ 134 CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 13, x13 + m_state[13]);\ 135 CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 14, x14 + m_state[14]);\ 136 CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 15, x15 + m_state[15]);} 138 #ifndef CRYPTOPP_DOXYGEN_PROCESSING 143 m_state[13] += static_cast<word32>(m_state[12] == 0);
Standard names for retrieving values by name when working with NameValuePairs.
ChaCha stream cipher information.
Utility functions for the Crypto++ library.
Library configuration file.
#define CRYPTOPP_KEYSTREAM_OUTPUT_SWITCH(x, y)
Helper macro to implement OperateKeystream.
A method was called which was not implemented.
ChaCha stream cipher implementation.
#define CRYPTOPP_ASSERT(exp)
Debugging and diagnostic assertion.
Functions for CPU features and intrinsics.
const char * IV()
ConstByteArrayParameter, also accepts const byte * for backwards compatibility.
bool HasSSE2()
Determines SSE2 availability.
Access a block of memory.
KeystreamOperation
Keystream operation flags.
Crypto++ library namespace.
SymmetricCipher implementation.
Classes for ChaCha8, ChaCha12 and ChaCha20 stream ciphers.
Interface for retrieving values given their names.