/*
u4.h version $Date: 2014/11/11 10:46:58 $
D. J. Bernstein
Romain Dolbeau
Public domain.
*/
// Modified by kerukuro for use in cppcrypto.
#define VEC4_ROT(a,imm) _mm_or_si128(_mm_slli_epi32(a,imm),_mm_srli_epi32(a,(32-imm)))
/* same, but replace 2 of the shift/shift/or "rotation" by byte shuffles (8 & 16) (better) */
#define VEC4_QUARTERROUND_SHUFFLE(a,b,c,d) \
x_##a = _mm_add_epi32(x_##a, x_##b); t_##a = _mm_xor_si128(x_##d, x_##a); x_##d = _mm_shuffle_epi8(t_##a, rot16); \
x_##c = _mm_add_epi32(x_##c, x_##d); t_##c = _mm_xor_si128(x_##b, x_##c); x_##b = VEC4_ROT(t_##c, 12); \
x_##a = _mm_add_epi32(x_##a, x_##b); t_##a = _mm_xor_si128(x_##d, x_##a); x_##d = _mm_shuffle_epi8(t_##a, rot8); \
x_##c = _mm_add_epi32(x_##c, x_##d); t_##c = _mm_xor_si128(x_##b, x_##c); x_##b = VEC4_ROT(t_##c, 7)
#define VEC4_QUARTERROUND(a,b,c,d) VEC4_QUARTERROUND_SHUFFLE(a,b,c,d)
// if (!bytes) return;
if (bytes>=256) {
/* constant for shuffling bytes (replacing multiple-of-8 rotates) */
__m128i rot16 = _mm_set_epi8(13,12,15,14,9,8,11,10,5,4,7,6,1,0,3,2);
__m128i rot8 = _mm_set_epi8(14,13,12,15,10,9,8,11,6,5,4,7,2,1,0,3);
uint32 in12, in13;
__m128i x_0 = _mm_set1_epi32(x[0]);
__m128i x_1 = _mm_set1_epi32(x[1]);
__m128i x_2 = _mm_set1_epi32(x[2]);
__m128i x_3 = _mm_set1_epi32(x[3]);
__m128i x_4 = _mm_set1_epi32(x[4]);
__m128i x_5 = _mm_set1_epi32(x[5]);
__m128i x_6 = _mm_set1_epi32(x[6]);
__m128i x_7 = _mm_set1_epi32(x[7]);
__m128i x_8 = _mm_set1_epi32(x[8]);
__m128i x_9 = _mm_set1_epi32(x[9]);
__m128i x_10 = _mm_set1_epi32(x[10]);
__m128i x_11 = _mm_set1_epi32(x[11]);
__m128i x_12;// = _mm_set1_epi32(x[12]); /* useless */
__m128i x_13;// = _mm_set1_epi32(x[13]); /* useless */
__m128i x_14 = _mm_set1_epi32(x[14]);
__m128i x_15 = _mm_set1_epi32(x[15]);
__m128i orig0 = x_0;
__m128i orig1 = x_1;
__m128i orig2 = x_2;
__m128i orig3 = x_3;
__m128i orig4 = x_4;
__m128i orig5 = x_5;
__m128i orig6 = x_6;
__m128i orig7 = x_7;
__m128i orig8 = x_8;
__m128i orig9 = x_9;
__m128i orig10 = x_10;
__m128i orig11 = x_11;
__m128i orig12;// = x_12; /* useless */
__m128i orig13;// = x_13; /* useless */
__m128i orig14 = x_14;
__m128i orig15 = x_15;
__m128i t_0;
__m128i t_1;
__m128i t_2;
__m128i t_3;
__m128i t_4;
__m128i t_5;
__m128i t_6;
__m128i t_7;
__m128i t_8;
__m128i t_9;
__m128i t_10;
__m128i t_11;
__m128i t_12;
__m128i t_13;
__m128i t_14;
__m128i t_15;
while (bytes >= 256) {
const __m128i addv12 = _mm_set_epi64x(1,0);
const __m128i addv13 = _mm_set_epi64x(3,2);
__m128i t12, t13;
uint64 in1213;
x_0 = orig0;
x_1 = orig1;
x_2 = orig2;
x_3 = orig3;
x_4 = orig4;
x_5 = orig5;
x_6 = orig6;
x_7 = orig7;
x_8 = orig8;
x_9 = orig9;
x_10 = orig10;
x_11 = orig11;
//x_12 = orig12; /* useless */
//x_13 = orig13; /* useless */
x_14 = orig14;
x_15 = orig15;
in12 = x[12];
in13 = x[13];
in1213 = ((uint64)in12) | (((uint64)in13) << 32);
t12 = _mm_set1_epi64x(in1213);
t13 = _mm_set1_epi64x(in1213);
x_12 = _mm_add_epi64(addv12, t12);
x_13 = _mm_add_epi64(addv13, t13);
t12 = _mm_unpacklo_epi32(x_12, x_13);
t13 = _mm_unpackhi_epi32(x_12, x_13);
x_12 = _mm_unpacklo_epi32(t12, t13);
x_13 = _mm_unpackhi_epi32(t12, t13);
orig12 = x_12;
orig13 = x_13;
in1213 += 4;
x[12] = in1213 & 0xFFFFFFFF;
x[13] = (in1213>>32)&0xFFFFFFFF;
for (i = 0 ; i < r ; ++i) {
VEC4_QUARTERROUND( 0, 4, 8,12);
VEC4_QUARTERROUND( 1, 5, 9,13);
VEC4_QUARTERROUND( 2, 6,10,14);
VEC4_QUARTERROUND( 3, 7,11,15);
VEC4_QUARTERROUND( 0, 5,10,15);
VEC4_QUARTERROUND( 1, 6,11,12);
VEC4_QUARTERROUND( 2, 7, 8,13);
VEC4_QUARTERROUND( 3, 4, 9,14);
}
#define ONEQUAD_TRANSPOSE(a,b,c,d) \
{ \
__m128i t0, t1, t2, t3; \
x_##a = _mm_add_epi32(x_##a, orig##a); \
x_##b = _mm_add_epi32(x_##b, orig##b); \
x_##c = _mm_add_epi32(x_##c, orig##c); \
x_##d = _mm_add_epi32(x_##d, orig##d); \
t_##a = _mm_unpacklo_epi32(x_##a, x_##b); \
t_##b = _mm_unpacklo_epi32(x_##c, x_##d); \
t_##c = _mm_unpackhi_epi32(x_##a, x_##b); \
t_##d = _mm_unpackhi_epi32(x_##c, x_##d); \
x_##a = _mm_unpacklo_epi64(t_##a, t_##b); \
x_##b = _mm_unpackhi_epi64(t_##a, t_##b); \
x_##c = _mm_unpacklo_epi64(t_##c, t_##d); \
x_##d = _mm_unpackhi_epi64(t_##c, t_##d); \
t0 = _mm_xor_si128(x_##a, _mm_loadu_si128((__m128i*)(m+0))); \
_mm_storeu_si128((__m128i*)(out+0),t0); \
t1 = _mm_xor_si128(x_##b, _mm_loadu_si128((__m128i*)(m+64))); \
_mm_storeu_si128((__m128i*)(out+64),t1); \
t2 = _mm_xor_si128(x_##c, _mm_loadu_si128((__m128i*)(m+128))); \
_mm_storeu_si128((__m128i*)(out+128),t2); \
t3 = _mm_xor_si128(x_##d, _mm_loadu_si128((__m128i*)(m+192))); \
_mm_storeu_si128((__m128i*)(out+192),t3); \
}
#define ONEQUAD(a,b,c,d) ONEQUAD_TRANSPOSE(a,b,c,d)
ONEQUAD(0,1,2,3);
m+=16;
out+=16;
ONEQUAD(4,5,6,7);
m+=16;
out+=16;
ONEQUAD(8,9,10,11);
m+=16;
out+=16;
ONEQUAD(12,13,14,15);
m-=48;
out-=48;
#undef ONEQUAD
#undef ONEQUAD_TRANSPOSE
bytes -= 256;
out += 256;
m += 256;
}
}
#undef VEC4_ROT
#undef VEC4_QUARTERROUND
#undef VEC4_QUARTERROUND_SHUFFLE
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