Some documentation fixes.
[BearSSL] / 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