_ Git - BearSSL/blob - src/symcipher/aes_x86ni_cbcenc.c

   1 /*
   2  * Copyright (c) 2017 Thomas Pornin <pornin@bolet.org>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining
   5  * a copy of this software and associated documentation files (the
   6  * "Software"), to deal in the Software without restriction, including
   7  * without limitation the rights to use, copy, modify, merge, publish,
   8  * distribute, sublicense, and/or sell copies of the Software, and to
   9  * permit persons to whom the Software is furnished to do so, subject to
  10  * the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  */
  24
  25 #define BR_ENABLE_INTRINSICS   1
  26 #include "inner.h"
  27
  28 #if BR_AES_X86NI
  29
  30 /* see bearssl_block.h */
  31 const br_block_cbcenc_class *
  32 br_aes_x86ni_cbcenc_get_vtable(void)
  33 {
  34         return br_aes_x86ni_supported() ? &br_aes_x86ni_cbcenc_vtable : NULL;
  35 }
  36
  37 /* see bearssl_block.h */
  38 void
  39 br_aes_x86ni_cbcenc_init(br_aes_x86ni_cbcenc_keys *ctx,
  40         const void *key, size_t len)
  41 {
  42         ctx->vtable = &br_aes_x86ni_cbcenc_vtable;
  43         ctx->num_rounds = br_aes_x86ni_keysched_enc(ctx->skey.skni, key, len);
  44 }
  45
  46 BR_TARGETS_X86_UP
  47
  48 /* see bearssl_block.h */
  49 BR_TARGET("sse2,aes")
  50 void
  51 br_aes_x86ni_cbcenc_run(const br_aes_x86ni_cbcenc_keys *ctx,
  52         void *iv, void *data, size_t len)
  53 {
  54         unsigned char *buf;
  55         unsigned num_rounds;
  56         __m128i sk[15], ivx;
  57         unsigned u;
  58
  59         buf = data;
  60         ivx = _mm_loadu_si128(iv);
  61         num_rounds = ctx->num_rounds;
  62         for (u = 0; u <= num_rounds; u ++) {
  63                 sk[u] = _mm_loadu_si128((void *)(ctx->skey.skni + (u << 4)));
  64         }
  65         while (len > 0) {
  66                 __m128i x;
  67
  68                 x = _mm_xor_si128(_mm_loadu_si128((void *)buf), ivx);
  69                 x = _mm_xor_si128(x, sk[0]);
  70                 x = _mm_aesenc_si128(x, sk[1]);
  71                 x = _mm_aesenc_si128(x, sk[2]);
  72                 x = _mm_aesenc_si128(x, sk[3]);
  73                 x = _mm_aesenc_si128(x, sk[4]);
  74                 x = _mm_aesenc_si128(x, sk[5]);
  75                 x = _mm_aesenc_si128(x, sk[6]);
  76                 x = _mm_aesenc_si128(x, sk[7]);
  77                 x = _mm_aesenc_si128(x, sk[8]);
  78                 x = _mm_aesenc_si128(x, sk[9]);
  79                 if (num_rounds == 10) {
  80                         x = _mm_aesenclast_si128(x, sk[10]);
  81                 } else if (num_rounds == 12) {
  82                         x = _mm_aesenc_si128(x, sk[10]);
  83                         x = _mm_aesenc_si128(x, sk[11]);
  84                         x = _mm_aesenclast_si128(x, sk[12]);
  85                 } else {
  86                         x = _mm_aesenc_si128(x, sk[10]);
  87                         x = _mm_aesenc_si128(x, sk[11]);
  88                         x = _mm_aesenc_si128(x, sk[12]);
  89                         x = _mm_aesenc_si128(x, sk[13]);
  90                         x = _mm_aesenclast_si128(x, sk[14]);
  91                 }
  92                 ivx = x;
  93                 _mm_storeu_si128((void *)buf, x);
  94                 buf += 16;
  95                 len -= 16;
  96         }
  97         _mm_storeu_si128(iv, ivx);
  98 }
  99
 100 BR_TARGETS_X86_DOWN
 101
 102 /* see bearssl_block.h */
 103 const br_block_cbcenc_class br_aes_x86ni_cbcenc_vtable = {
 104         sizeof(br_aes_x86ni_cbcenc_keys),
 105         16,
 106         4,
 107         (void (*)(const br_block_cbcenc_class **, const void *, size_t))
 108                 &br_aes_x86ni_cbcenc_init,
 109         (void (*)(const br_block_cbcenc_class *const *, void *, void *, size_t))
 110                 &br_aes_x86ni_cbcenc_run
 111 };
 112
 113 #else
 114
 115 /* see bearssl_block.h */
 116 const br_block_cbcenc_class *
 117 br_aes_x86ni_cbcenc_get_vtable(void)
 118 {
 119         return NULL;
 120 }
 121
 122 #endif