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))