Extra Makefile hack for compatibility with OpenBSD 'make'.
[BearSSL] / src / symcipher / aes_ct_cbcenc.c
1 /*
2 * Copyright (c) 2016 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 #include "inner.h"
26
27 /* see bearssl_block.h */
28 void
29 br_aes_ct_cbcenc_init(br_aes_ct_cbcenc_keys *ctx,
30 const void *key, size_t len)
31 {
32 ctx->vtable = &br_aes_ct_cbcenc_vtable;
33 ctx->num_rounds = br_aes_ct_keysched(ctx->skey, key, len);
34 }
35
36 /* see bearssl_block.h */
37 void
38 br_aes_ct_cbcenc_run(const br_aes_ct_cbcenc_keys *ctx,
39 void *iv, void *data, size_t len)
40 {
41 unsigned char *buf, *ivbuf;
42 uint32_t q[8];
43 uint32_t iv0, iv1, iv2, iv3;
44 uint32_t sk_exp[120];
45
46 q[1] = 0;
47 q[3] = 0;
48 q[5] = 0;
49 q[7] = 0;
50 br_aes_ct_skey_expand(sk_exp, ctx->num_rounds, ctx->skey);
51 ivbuf = iv;
52 iv0 = br_dec32le(ivbuf);
53 iv1 = br_dec32le(ivbuf + 4);
54 iv2 = br_dec32le(ivbuf + 8);
55 iv3 = br_dec32le(ivbuf + 12);
56 buf = data;
57 while (len > 0) {
58 q[0] = iv0 ^ br_dec32le(buf);
59 q[2] = iv1 ^ br_dec32le(buf + 4);
60 q[4] = iv2 ^ br_dec32le(buf + 8);
61 q[6] = iv3 ^ br_dec32le(buf + 12);
62 br_aes_ct_ortho(q);
63 br_aes_ct_bitslice_encrypt(ctx->num_rounds, sk_exp, q);
64 br_aes_ct_ortho(q);
65 iv0 = q[0];
66 iv1 = q[2];
67 iv2 = q[4];
68 iv3 = q[6];
69 br_enc32le(buf, iv0);
70 br_enc32le(buf + 4, iv1);
71 br_enc32le(buf + 8, iv2);
72 br_enc32le(buf + 12, iv3);
73 buf += 16;
74 len -= 16;
75 }
76 br_enc32le(ivbuf, iv0);
77 br_enc32le(ivbuf + 4, iv1);
78 br_enc32le(ivbuf + 8, iv2);
79 br_enc32le(ivbuf + 12, iv3);
80 }
81
82 /* see bearssl_block.h */
83 const br_block_cbcenc_class br_aes_ct_cbcenc_vtable = {
84 sizeof(br_aes_ct_cbcenc_keys),
85 16,
86 4,
87 (void (*)(const br_block_cbcenc_class **, const void *, size_t))
88 &br_aes_ct_cbcenc_init,
89 (void (*)(const br_block_cbcenc_class *const *, void *, void *, size_t))
90 &br_aes_ct_cbcenc_run
91 };