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
br_des_ct_cbcenc_init(br_des_ct_cbcenc_keys * ctx,const void * key,size_t len)29 br_des_ct_cbcenc_init(br_des_ct_cbcenc_keys *ctx,
30 const void *key, size_t len)
31 {
32 ctx->vtable = &br_des_ct_cbcenc_vtable;
33 ctx->num_rounds = br_des_ct_keysched(ctx->skey, key, len);
34 }
35
36 /* see bearssl_block.h */
37 void
br_des_ct_cbcenc_run(const br_des_ct_cbcenc_keys * ctx,void * iv,void * data,size_t len)38 br_des_ct_cbcenc_run(const br_des_ct_cbcenc_keys *ctx,
39 void *iv, void *data, size_t len)
40 {
41 unsigned char *buf, *ivbuf;
42 uint32_t sk_exp[288];
43
44 br_des_ct_skey_expand(sk_exp, ctx->num_rounds, ctx->skey);
45 ivbuf = iv;
46 buf = data;
47 while (len > 0) {
48 int i;
49
50 for (i = 0; i < 8; i ++) {
51 buf[i] ^= ivbuf[i];
52 }
53 br_des_ct_process_block(ctx->num_rounds, sk_exp, buf);
54 memcpy(ivbuf, buf, 8);
55 buf += 8;
56 len -= 8;
57 }
58 }
59
60 /* see bearssl_block.h */
61 const br_block_cbcenc_class br_des_ct_cbcenc_vtable = {
62 sizeof(br_des_ct_cbcenc_keys),
63 8,
64 3,
65 (void (*)(const br_block_cbcenc_class **, const void *, size_t))
66 &br_des_ct_cbcenc_init,
67 (void (*)(const br_block_cbcenc_class *const *, void *, void *, size_t))
68 &br_des_ct_cbcenc_run
69 };
70