| /* This Source Code Form is subject to the terms of the Mozilla Public |
| * License, v. 2.0. If a copy of the MPL was not distributed with this |
| * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| |
| #ifdef FREEBL_NO_DEPEND |
| #include "stubs.h" |
| #endif |
| #include "gcm.h" |
| #include "secerr.h" |
| |
| #include <wmmintrin.h> /* clmul */ |
| |
| #define WRITE64(x, bytes) \ |
| (bytes)[0] = (x) >> 56; \ |
| (bytes)[1] = (x) >> 48; \ |
| (bytes)[2] = (x) >> 40; \ |
| (bytes)[3] = (x) >> 32; \ |
| (bytes)[4] = (x) >> 24; \ |
| (bytes)[5] = (x) >> 16; \ |
| (bytes)[6] = (x) >> 8; \ |
| (bytes)[7] = (x); |
| |
| SECStatus |
| gcm_HashWrite_hw(gcmHashContext *ghash, unsigned char *outbuf) |
| { |
| uint64_t tmp_out[2]; |
| _mm_storeu_si128((__m128i *)tmp_out, ghash->x); |
| /* maxout must be larger than 16 byte (checked by the caller). */ |
| WRITE64(tmp_out[0], outbuf + 8); |
| WRITE64(tmp_out[1], outbuf); |
| return SECSuccess; |
| } |
| |
| SECStatus |
| gcm_HashMult_hw(gcmHashContext *ghash, const unsigned char *buf, |
| unsigned int count) |
| { |
| size_t i; |
| pre_align __m128i z_high post_align; |
| pre_align __m128i z_low post_align; |
| pre_align __m128i C post_align; |
| pre_align __m128i D post_align; |
| pre_align __m128i E post_align; |
| pre_align __m128i F post_align; |
| pre_align __m128i bin post_align; |
| pre_align __m128i Ci post_align; |
| pre_align __m128i tmp post_align; |
| |
| for (i = 0; i < count; i++, buf += 16) { |
| bin = _mm_set_epi16(((uint16_t)buf[0] << 8) | buf[1], |
| ((uint16_t)buf[2] << 8) | buf[3], |
| ((uint16_t)buf[4] << 8) | buf[5], |
| ((uint16_t)buf[6] << 8) | buf[7], |
| ((uint16_t)buf[8] << 8) | buf[9], |
| ((uint16_t)buf[10] << 8) | buf[11], |
| ((uint16_t)buf[12] << 8) | buf[13], |
| ((uint16_t)buf[14] << 8) | buf[15]); |
| Ci = _mm_xor_si128(bin, ghash->x); |
| |
| /* Do binary mult ghash->X = Ci * ghash->H. */ |
| C = _mm_clmulepi64_si128(Ci, ghash->h, 0x00); |
| D = _mm_clmulepi64_si128(Ci, ghash->h, 0x11); |
| E = _mm_clmulepi64_si128(Ci, ghash->h, 0x01); |
| F = _mm_clmulepi64_si128(Ci, ghash->h, 0x10); |
| tmp = _mm_xor_si128(E, F); |
| z_high = _mm_xor_si128(tmp, _mm_slli_si128(D, 8)); |
| z_high = _mm_unpackhi_epi64(z_high, D); |
| z_low = _mm_xor_si128(_mm_slli_si128(tmp, 8), C); |
| z_low = _mm_unpackhi_epi64(_mm_slli_si128(C, 8), z_low); |
| |
| /* Shift one to the left (multiply by x) as gcm spec is stupid. */ |
| C = _mm_slli_si128(z_low, 8); |
| E = _mm_srli_epi64(C, 63); |
| D = _mm_slli_si128(z_high, 8); |
| F = _mm_srli_epi64(D, 63); |
| /* Carry over */ |
| C = _mm_srli_si128(z_low, 8); |
| D = _mm_srli_epi64(C, 63); |
| z_low = _mm_or_si128(_mm_slli_epi64(z_low, 1), E); |
| z_high = _mm_or_si128(_mm_or_si128(_mm_slli_epi64(z_high, 1), F), D); |
| |
| /* Reduce */ |
| C = _mm_slli_si128(z_low, 8); |
| /* D = z_low << 127 */ |
| D = _mm_slli_epi64(C, 63); |
| /* E = z_low << 126 */ |
| E = _mm_slli_epi64(C, 62); |
| /* F = z_low << 121 */ |
| F = _mm_slli_epi64(C, 57); |
| /* z_low ^= (z_low << 127) ^ (z_low << 126) ^ (z_low << 121); */ |
| z_low = _mm_xor_si128(_mm_xor_si128(_mm_xor_si128(z_low, D), E), F); |
| C = _mm_srli_si128(z_low, 8); |
| /* D = z_low >> 1 */ |
| D = _mm_slli_epi64(C, 63); |
| D = _mm_or_si128(_mm_srli_epi64(z_low, 1), D); |
| /* E = z_low >> 2 */ |
| E = _mm_slli_epi64(C, 62); |
| E = _mm_or_si128(_mm_srli_epi64(z_low, 2), E); |
| /* F = z_low >> 7 */ |
| F = _mm_slli_epi64(C, 57); |
| F = _mm_or_si128(_mm_srli_epi64(z_low, 7), F); |
| /* ghash->x ^= z_low ^ (z_low >> 1) ^ (z_low >> 2) ^ (z_low >> 7); */ |
| ghash->x = _mm_xor_si128(_mm_xor_si128( |
| _mm_xor_si128(_mm_xor_si128(z_high, z_low), D), E), |
| F); |
| } |
| return SECSuccess; |
| } |
| |
| SECStatus |
| gcm_HashInit_hw(gcmHashContext *ghash) |
| { |
| ghash->ghash_mul = gcm_HashMult_hw; |
| ghash->x = _mm_setzero_si128(); |
| /* MSVC requires __m64 to load epi64. */ |
| ghash->h = _mm_set_epi32(ghash->h_high >> 32, (uint32_t)ghash->h_high, |
| ghash->h_low >> 32, (uint32_t)ghash->h_low); |
| ghash->hw = PR_TRUE; |
| return SECSuccess; |
| } |
| |
| SECStatus |
| gcm_HashZeroX_hw(gcmHashContext *ghash) |
| { |
| ghash->x = _mm_setzero_si128(); |
| return SECSuccess; |
| } |