File Coverage

src/symcipher/aes_ct64_cbcenc.c
Criterion Covered Total %
statement 0 27 0.0
branch 0 2 0.0
condition n/a
subroutine n/a
pod n/a
total 0 29 0.0


line stmt bran cond sub pod time code
1             /*
2             * Copyright (c) 2016 Thomas Pornin
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 0           br_aes_ct64_cbcenc_init(br_aes_ct64_cbcenc_keys *ctx,
30             const void *key, size_t len)
31             {
32 0           ctx->vtable = &br_aes_ct64_cbcenc_vtable;
33 0           ctx->num_rounds = br_aes_ct64_keysched(ctx->skey, key, len);
34 0           }
35              
36             /* see bearssl_block.h */
37             void
38 0           br_aes_ct64_cbcenc_run(const br_aes_ct64_cbcenc_keys *ctx,
39             void *iv, void *data, size_t len)
40             {
41             unsigned char *buf;
42             uint64_t sk_exp[120];
43             uint32_t ivw[4];
44              
45 0           br_aes_ct64_skey_expand(sk_exp, ctx->num_rounds, ctx->skey);
46 0           br_range_dec32le(ivw, 4, iv);
47 0           buf = data;
48 0 0         while (len > 0) {
49             uint32_t w[4];
50             uint64_t q[8];
51              
52 0           w[0] = ivw[0] ^ br_dec32le(buf);
53 0           w[1] = ivw[1] ^ br_dec32le(buf + 4);
54 0           w[2] = ivw[2] ^ br_dec32le(buf + 8);
55 0           w[3] = ivw[3] ^ br_dec32le(buf + 12);
56 0           br_aes_ct64_interleave_in(&q[0], &q[4], w);
57 0           br_aes_ct64_ortho(q);
58 0           br_aes_ct64_bitslice_encrypt(ctx->num_rounds, sk_exp, q);
59 0           br_aes_ct64_ortho(q);
60 0           br_aes_ct64_interleave_out(w, q[0], q[4]);
61 0           memcpy(ivw, w, sizeof w);
62 0           br_enc32le(buf, w[0]);
63 0           br_enc32le(buf + 4, w[1]);
64 0           br_enc32le(buf + 8, w[2]);
65 0           br_enc32le(buf + 12, w[3]);
66 0           buf += 16;
67 0           len -= 16;
68             }
69 0           br_range_enc32le(iv, ivw, 4);
70 0           }
71              
72             /* see bearssl_block.h */
73             const br_block_cbcenc_class br_aes_ct64_cbcenc_vtable = {
74             sizeof(br_aes_ct64_cbcenc_keys),
75             16,
76             4,
77             (void (*)(const br_block_cbcenc_class **, const void *, size_t))
78             &br_aes_ct64_cbcenc_init,
79             (void (*)(const br_block_cbcenc_class *const *, void *, void *, size_t))
80             &br_aes_ct64_cbcenc_run
81             };