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
28 block_size(const br_hash_class
*dig
)
32 ls
= (unsigned)(dig
->desc
>> BR_HASHDESC_LBLEN_OFF
)
33 & BR_HASHDESC_LBLEN_MASK
;
34 return (size_t)1 << ls
;
38 process_key(const br_hash_class
**hc
, void *ks
,
39 const void *key
, size_t key_len
, unsigned bb
)
41 unsigned char tmp
[256];
44 blen
= block_size(*hc
);
45 memcpy(tmp
, key
, key_len
);
46 for (u
= 0; u
< key_len
; u
++) {
47 tmp
[u
] ^= (unsigned char)bb
;
49 memset(tmp
+ key_len
, bb
, blen
- key_len
);
51 (*hc
)->update(hc
, tmp
, blen
);
57 br_hmac_key_init(br_hmac_key_context
*kc
,
58 const br_hash_class
*dig
, const void *key
, size_t key_len
)
60 br_hash_compat_context hc
;
61 unsigned char kbuf
[64];
65 if (key_len
> block_size(dig
)) {
66 dig
->init(&hc
.vtable
);
67 dig
->update(&hc
.vtable
, key
, key_len
);
68 dig
->out(&hc
.vtable
, kbuf
);
70 key_len
= br_digest_size(dig
);
72 process_key(&hc
.vtable
, kc
->ksi
, key
, key_len
, 0x36);
73 process_key(&hc
.vtable
, kc
->kso
, key
, key_len
, 0x5C);
78 br_hmac_init(br_hmac_context
*ctx
,
79 const br_hmac_key_context
*kc
, size_t out_len
)
81 const br_hash_class
*dig
;
85 blen
= block_size(dig
);
86 dig
->init(&ctx
->dig
.vtable
);
87 dig
->set_state(&ctx
->dig
.vtable
, kc
->ksi
, (uint64_t)blen
);
88 memcpy(ctx
->kso
, kc
->kso
, sizeof kc
->kso
);
89 hlen
= br_digest_size(dig
);
90 if (out_len
> 0 && out_len
< hlen
) {
98 br_hmac_update(br_hmac_context
*ctx
, const void *data
, size_t len
)
100 ctx
->dig
.vtable
->update(&ctx
->dig
.vtable
, data
, len
);
105 br_hmac_out(const br_hmac_context
*ctx
, void *out
)
107 const br_hash_class
*dig
;
108 br_hash_compat_context hc
;
109 unsigned char tmp
[64];
112 dig
= ctx
->dig
.vtable
;
113 dig
->out(&ctx
->dig
.vtable
, tmp
);
114 blen
= block_size(dig
);
115 dig
->init(&hc
.vtable
);
116 dig
->set_state(&hc
.vtable
, ctx
->kso
, (uint64_t)blen
);
117 hlen
= br_digest_size(dig
);
118 dig
->update(&hc
.vtable
, tmp
, hlen
);
119 dig
->out(&hc
.vtable
, tmp
);
120 memcpy(out
, tmp
, ctx
->out_len
);