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Another very small crypto optimization.

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This commit is contained in:
Adam Ierymenko 2017-05-03 07:43:23 -07:00
parent d7c99728bc
commit 41c187ba12
1 changed files with 40 additions and 1 deletions
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41
node/Salsa20.hpp
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@ -48,6 +48,43 @@ public:
static inline void memxor(uint8_t *d,const uint8_t *s,unsigned int len) static inline void memxor(uint8_t *d,const uint8_t *s,unsigned int len)
{ {
#ifdef ZT_SALSA20_SSE #ifdef ZT_SALSA20_SSE
while (len >= 128) {
__m128i s0 = _mm_loadu_si128(reinterpret_cast<const __m128i *>(s));
__m128i s1 = _mm_loadu_si128(reinterpret_cast<const __m128i *>(s + 16));
__m128i s2 = _mm_loadu_si128(reinterpret_cast<const __m128i *>(s + 32));
__m128i s3 = _mm_loadu_si128(reinterpret_cast<const __m128i *>(s + 48));
__m128i s4 = _mm_loadu_si128(reinterpret_cast<const __m128i *>(s + 64));
__m128i s5 = _mm_loadu_si128(reinterpret_cast<const __m128i *>(s + 80));
__m128i s6 = _mm_loadu_si128(reinterpret_cast<const __m128i *>(s + 96));
__m128i s7 = _mm_loadu_si128(reinterpret_cast<const __m128i *>(s + 112));
__m128i d0 = _mm_loadu_si128(reinterpret_cast<__m128i *>(d));
__m128i d1 = _mm_loadu_si128(reinterpret_cast<__m128i *>(d + 16));
__m128i d2 = _mm_loadu_si128(reinterpret_cast<__m128i *>(d + 32));
__m128i d3 = _mm_loadu_si128(reinterpret_cast<__m128i *>(d + 48));
__m128i d4 = _mm_loadu_si128(reinterpret_cast<__m128i *>(d + 64));
__m128i d5 = _mm_loadu_si128(reinterpret_cast<__m128i *>(d + 80));
__m128i d6 = _mm_loadu_si128(reinterpret_cast<__m128i *>(d + 96));
__m128i d7 = _mm_loadu_si128(reinterpret_cast<__m128i *>(d + 112));
d0 = _mm_xor_si128(d0,s0);
d1 = _mm_xor_si128(d1,s1);
d2 = _mm_xor_si128(d2,s2);
d3 = _mm_xor_si128(d3,s3);
d4 = _mm_xor_si128(d4,s4);
d5 = _mm_xor_si128(d5,s5);
d6 = _mm_xor_si128(d6,s6);
d7 = _mm_xor_si128(d7,s7);
_mm_storeu_si128(reinterpret_cast<__m128i *>(d),d0);
_mm_storeu_si128(reinterpret_cast<__m128i *>(d + 16),d1);
_mm_storeu_si128(reinterpret_cast<__m128i *>(d + 32),d2);
_mm_storeu_si128(reinterpret_cast<__m128i *>(d + 48),d3);
_mm_storeu_si128(reinterpret_cast<__m128i *>(d + 64),d4);
_mm_storeu_si128(reinterpret_cast<__m128i *>(d + 80),d5);
_mm_storeu_si128(reinterpret_cast<__m128i *>(d + 96),d6);
_mm_storeu_si128(reinterpret_cast<__m128i *>(d + 112),d7);
s += 128;
d += 128;
len -= 128;
}
while (len >= 16) { while (len >= 16) {
_mm_storeu_si128(reinterpret_cast<__m128i *>(d),_mm_xor_si128(_mm_loadu_si128(reinterpret_cast<__m128i *>(d)),_mm_loadu_si128(reinterpret_cast<const __m128i *>(s)))); _mm_storeu_si128(reinterpret_cast<__m128i *>(d),_mm_xor_si128(_mm_loadu_si128(reinterpret_cast<__m128i *>(d)),_mm_loadu_si128(reinterpret_cast<const __m128i *>(s))));
s += 16; s += 16;
@ -67,9 +104,11 @@ public:
} }
#endif #endif
#endif #endif
while (len--) while (len) {
--len;
*(d++) ^= *(s++); *(d++) ^= *(s++);
} }
}
/** /**
* @param key 256-bit (32 byte) key * @param key 256-bit (32 byte) key