2 * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
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:
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
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
27 /* see bearssl_block.h */
29 br_aes_ct64_ctr_init(br_aes_ct64_ctr_keys *ctx,
30 const void *key, size_t len)
32 ctx->vtable = &br_aes_ct64_ctr_vtable;
33 ctx->num_rounds = br_aes_ct64_keysched(ctx->skey, key, len);
37 xorbuf(void *dst, const void *src, size_t len)
40 const unsigned char *s;
49 /* see bearssl_block.h */
51 br_aes_ct64_ctr_run(const br_aes_ct64_ctr_keys *ctx,
52 const void *iv, uint32_t cc, void *data, size_t len)
58 br_aes_ct64_skey_expand(sk_exp, ctx->num_rounds, ctx->skey);
59 br_range_dec32le(ivw, 3, iv);
60 memcpy(ivw + 4, ivw, 3 * sizeof(uint32_t));
61 memcpy(ivw + 8, ivw, 3 * sizeof(uint32_t));
62 memcpy(ivw + 12, ivw, 3 * sizeof(uint32_t));
67 unsigned char tmp[64];
71 * TODO: see if we can save on the first br_aes_ct64_ortho()
72 * call, since iv0/iv1/iv2 are constant for the whole run.
74 memcpy(w, ivw, sizeof ivw);
76 w[7] = br_swap32(cc + 1);
77 w[11] = br_swap32(cc + 2);
78 w[15] = br_swap32(cc + 3);
79 for (i = 0; i < 4; i ++) {
80 br_aes_ct64_interleave_in(
81 &q[i], &q[i + 4], w + (i << 2));
84 br_aes_ct64_bitslice_encrypt(ctx->num_rounds, sk_exp, q);
86 for (i = 0; i < 4; i ++) {
87 br_aes_ct64_interleave_out(
88 w + (i << 2), q[i], q[i + 4]);
90 br_range_enc32le(tmp, w, 16);
92 xorbuf(buf, tmp, len);
93 cc += (uint32_t)len >> 4;
104 /* see bearssl_block.h */
105 const br_block_ctr_class br_aes_ct64_ctr_vtable = {
106 sizeof(br_aes_ct64_ctr_keys),
109 (void (*)(const br_block_ctr_class **, const void *, size_t))
110 &br_aes_ct64_ctr_init,
111 (uint32_t (*)(const br_block_ctr_class *const *,
112 const void *, uint32_t, void *, size_t))