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.h */
28void
29br_md5sha1_init(br_md5sha1_context *cc)
30{
31	cc->vtable = &br_md5sha1_vtable;
32	memcpy(cc->val_md5, br_md5_IV, sizeof cc->val_md5);
33	memcpy(cc->val_sha1, br_sha1_IV, sizeof cc->val_sha1);
34	cc->count = 0;
35}
36
37/* see bearssl.h */
38void
39br_md5sha1_update(br_md5sha1_context *cc, const void *data, size_t len)
40{
41	const unsigned char *buf;
42	size_t ptr;
43
44	buf = data;
45	ptr = (size_t)cc->count & 63;
46	while (len > 0) {
47		size_t clen;
48
49		clen = 64 - ptr;
50		if (clen > len) {
51			clen = len;
52		}
53		memcpy(cc->buf + ptr, buf, clen);
54		ptr += clen;
55		buf += clen;
56		len -= clen;
57		cc->count += (uint64_t)clen;
58		if (ptr == 64) {
59			br_md5_round(cc->buf, cc->val_md5);
60			br_sha1_round(cc->buf, cc->val_sha1);
61			ptr = 0;
62		}
63	}
64}
65
66/* see bearssl.h */
67void
68br_md5sha1_out(const br_md5sha1_context *cc, void *dst)
69{
70	unsigned char buf[64];
71	uint32_t val_md5[4];
72	uint32_t val_sha1[5];
73	size_t ptr;
74	unsigned char *out;
75	uint64_t count;
76
77	count = cc->count;
78	ptr = (size_t)count & 63;
79	memcpy(buf, cc->buf, ptr);
80	memcpy(val_md5, cc->val_md5, sizeof val_md5);
81	memcpy(val_sha1, cc->val_sha1, sizeof val_sha1);
82	buf[ptr ++] = 0x80;
83	if (ptr > 56) {
84		memset(buf + ptr, 0, 64 - ptr);
85		br_md5_round(buf, val_md5);
86		br_sha1_round(buf, val_sha1);
87		memset(buf, 0, 56);
88	} else {
89		memset(buf + ptr, 0, 56 - ptr);
90	}
91	count <<= 3;
92	br_enc64le(buf + 56, count);
93	br_md5_round(buf, val_md5);
94	br_enc64be(buf + 56, count);
95	br_sha1_round(buf, val_sha1);
96	out = dst;
97	br_range_enc32le(out, val_md5, 4);
98	br_range_enc32be(out + 16, val_sha1, 5);
99}
100
101/* see bearssl.h */
102uint64_t
103br_md5sha1_state(const br_md5sha1_context *cc, void *dst)
104{
105	unsigned char *out;
106
107	out = dst;
108	br_range_enc32le(out, cc->val_md5, 4);
109	br_range_enc32be(out + 16, cc->val_sha1, 5);
110	return cc->count;
111}
112
113/* see bearssl.h */
114void
115br_md5sha1_set_state(br_md5sha1_context *cc, const void *stb, uint64_t count)
116{
117	const unsigned char *buf;
118
119	buf = stb;
120	br_range_dec32le(cc->val_md5, 4, buf);
121	br_range_dec32be(cc->val_sha1, 5, buf + 16);
122	cc->count = count;
123}
124
125/* see bearssl.h */
126const br_hash_class br_md5sha1_vtable = {
127	sizeof(br_md5sha1_context),
128	BR_HASHDESC_ID(br_md5sha1_ID)
129		| BR_HASHDESC_OUT(36)
130		| BR_HASHDESC_STATE(36)
131		| BR_HASHDESC_LBLEN(6),
132	(void (*)(const br_hash_class **))&br_md5sha1_init,
133	(void (*)(const br_hash_class **, const void *, size_t))
134		&br_md5sha1_update,
135	(void (*)(const br_hash_class *const *, void *))
136		&br_md5sha1_out,
137	(uint64_t (*)(const br_hash_class *const *, void *))
138		&br_md5sha1_state,
139	(void (*)(const br_hash_class **, const void *, uint64_t))
140		&br_md5sha1_set_state
141};
142