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Speed up Salsa20 just a bit.

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This commit is contained in:
Adam Ierymenko 2015-09-30 14:35:05 -07:00
parent 1a4f16e0ed
commit 789046ca57
2 changed files with 75 additions and 4 deletions
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77
node/Salsa20.cpp
View File

@ -122,7 +122,7 @@ void Salsa20::init(const void *key,unsigned int kbits,const void *iv,unsigned in
_state.i[0] = U8TO32_LITTLE(constants + 0);
#endif
_roundsDiv2 = rounds / 2;
_roundsDiv4 = rounds / 4;
}
void Salsa20::encrypt(const void *in,void *out,unsigned int bytes)
@ -180,7 +180,7 @@ void Salsa20::encrypt(const void *in,void *out,unsigned int bytes)
__m128i X2s = X2;
__m128i X3s = X3;
for (i=0;i<_roundsDiv2;++i) {
for (i=0;i<_roundsDiv4;++i) {
__m128i T = _mm_add_epi32(X0, X3);
X1 = _mm_xor_si128(X1, _mm_slli_epi32(T, 7));
X1 = _mm_xor_si128(X1, _mm_srli_epi32(T, 25));
@ -214,6 +214,42 @@ void Salsa20::encrypt(const void *in,void *out,unsigned int bytes)
X1 = _mm_shuffle_epi32(X1, 0x39);
X2 = _mm_shuffle_epi32(X2, 0x4E);
X3 = _mm_shuffle_epi32(X3, 0x93);
// --
T = _mm_add_epi32(X0, X3);
X1 = _mm_xor_si128(X1, _mm_slli_epi32(T, 7));
X1 = _mm_xor_si128(X1, _mm_srli_epi32(T, 25));
T = _mm_add_epi32(X1, X0);
X2 = _mm_xor_si128(X2, _mm_slli_epi32(T, 9));
X2 = _mm_xor_si128(X2, _mm_srli_epi32(T, 23));
T = _mm_add_epi32(X2, X1);
X3 = _mm_xor_si128(X3, _mm_slli_epi32(T, 13));
X3 = _mm_xor_si128(X3, _mm_srli_epi32(T, 19));
T = _mm_add_epi32(X3, X2);
X0 = _mm_xor_si128(X0, _mm_slli_epi32(T, 18));
X0 = _mm_xor_si128(X0, _mm_srli_epi32(T, 14));
X1 = _mm_shuffle_epi32(X1, 0x93);
X2 = _mm_shuffle_epi32(X2, 0x4E);
X3 = _mm_shuffle_epi32(X3, 0x39);
T = _mm_add_epi32(X0, X1);
X3 = _mm_xor_si128(X3, _mm_slli_epi32(T, 7));
X3 = _mm_xor_si128(X3, _mm_srli_epi32(T, 25));
T = _mm_add_epi32(X3, X0);
X2 = _mm_xor_si128(X2, _mm_slli_epi32(T, 9));
X2 = _mm_xor_si128(X2, _mm_srli_epi32(T, 23));
T = _mm_add_epi32(X2, X3);
X1 = _mm_xor_si128(X1, _mm_slli_epi32(T, 13));
X1 = _mm_xor_si128(X1, _mm_srli_epi32(T, 19));
T = _mm_add_epi32(X1, X2);
X0 = _mm_xor_si128(X0, _mm_slli_epi32(T, 18));
X0 = _mm_xor_si128(X0, _mm_srli_epi32(T, 14));
X1 = _mm_shuffle_epi32(X1, 0x39);
X2 = _mm_shuffle_epi32(X2, 0x4E);
X3 = _mm_shuffle_epi32(X3, 0x93);
}
X0 = _mm_add_epi32(X0s,X0);
@ -260,7 +296,42 @@ void Salsa20::encrypt(const void *in,void *out,unsigned int bytes)
x14 = j14;
x15 = j15;
for(i=0;i<_roundsDiv2;++i) {
for(i=0;i<_roundsDiv4;++i) {
x4 = XOR( x4,ROTATE(PLUS( x0,x12), 7));
x8 = XOR( x8,ROTATE(PLUS( x4, x0), 9));
x12 = XOR(x12,ROTATE(PLUS( x8, x4),13));
x0 = XOR( x0,ROTATE(PLUS(x12, x8),18));
x9 = XOR( x9,ROTATE(PLUS( x5, x1), 7));
x13 = XOR(x13,ROTATE(PLUS( x9, x5), 9));
x1 = XOR( x1,ROTATE(PLUS(x13, x9),13));
x5 = XOR( x5,ROTATE(PLUS( x1,x13),18));
x14 = XOR(x14,ROTATE(PLUS(x10, x6), 7));
x2 = XOR( x2,ROTATE(PLUS(x14,x10), 9));
x6 = XOR( x6,ROTATE(PLUS( x2,x14),13));
x10 = XOR(x10,ROTATE(PLUS( x6, x2),18));
x3 = XOR( x3,ROTATE(PLUS(x15,x11), 7));
x7 = XOR( x7,ROTATE(PLUS( x3,x15), 9));
x11 = XOR(x11,ROTATE(PLUS( x7, x3),13));
x15 = XOR(x15,ROTATE(PLUS(x11, x7),18));
x1 = XOR( x1,ROTATE(PLUS( x0, x3), 7));
x2 = XOR( x2,ROTATE(PLUS( x1, x0), 9));
x3 = XOR( x3,ROTATE(PLUS( x2, x1),13));
x0 = XOR( x0,ROTATE(PLUS( x3, x2),18));
x6 = XOR( x6,ROTATE(PLUS( x5, x4), 7));
x7 = XOR( x7,ROTATE(PLUS( x6, x5), 9));
x4 = XOR( x4,ROTATE(PLUS( x7, x6),13));
x5 = XOR( x5,ROTATE(PLUS( x4, x7),18));
x11 = XOR(x11,ROTATE(PLUS(x10, x9), 7));
x8 = XOR( x8,ROTATE(PLUS(x11,x10), 9));
x9 = XOR( x9,ROTATE(PLUS( x8,x11),13));
x10 = XOR(x10,ROTATE(PLUS( x9, x8),18));
x12 = XOR(x12,ROTATE(PLUS(x15,x14), 7));
x13 = XOR(x13,ROTATE(PLUS(x12,x15), 9));
x14 = XOR(x14,ROTATE(PLUS(x13,x12),13));
x15 = XOR(x15,ROTATE(PLUS(x14,x13),18));
// --
x4 = XOR( x4,ROTATE(PLUS( x0,x12), 7));
x8 = XOR( x8,ROTATE(PLUS( x4, x0), 9));
x12 = XOR(x12,ROTATE(PLUS( x8, x4),13));

2
node/Salsa20.hpp
View File

@ -84,7 +84,7 @@ private:
#endif // ZT_SALSA20_SSE
uint32_t i[16];
} _state;
unsigned int _roundsDiv2;
unsigned int _roundsDiv4;
};
} // namespace ZeroTier