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 */
28void
29br_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 */
37void
38br_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 */
61const 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