1 d1cda826 2017-11-06 stsp /*
 2 a1fd68d8 2018-01-12 stsp  * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
 3 d1cda826 2017-11-06 stsp  *
 4 d1cda826 2017-11-06 stsp  * Permission to use, copy, modify, and distribute this software for any
 5 d1cda826 2017-11-06 stsp  * purpose with or without fee is hereby granted, provided that the above
 6 d1cda826 2017-11-06 stsp  * copyright notice and this permission notice appear in all copies.
 7 d1cda826 2017-11-06 stsp  *
 8 d1cda826 2017-11-06 stsp  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 9 d1cda826 2017-11-06 stsp  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 d1cda826 2017-11-06 stsp  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 d1cda826 2017-11-06 stsp  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 d1cda826 2017-11-06 stsp  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 d1cda826 2017-11-06 stsp  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 d1cda826 2017-11-06 stsp  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 d1cda826 2017-11-06 stsp  */
16 d1cda826 2017-11-06 stsp 
17 d1cda826 2017-11-06 stsp #include <sys/types.h>
18 d1cda826 2017-11-06 stsp #include <sha1.h>
19 d1cda826 2017-11-06 stsp #include <errno.h>
20 a1fd68d8 2018-01-12 stsp #include <stdio.h>
21 d1cda826 2017-11-06 stsp #include <stdlib.h>
22 d1cda826 2017-11-06 stsp #include <limits.h>
23 d1cda826 2017-11-06 stsp 
24 d1cda826 2017-11-06 stsp static int
25 d1cda826 2017-11-06 stsp parse_xdigit(uint8_t *val, const char *hex)
26 d1cda826 2017-11-06 stsp {
27 d1cda826 2017-11-06 stsp 	char *ep;
28 d1cda826 2017-11-06 stsp 	long lval;
29 d1cda826 2017-11-06 stsp 
30 d1cda826 2017-11-06 stsp 	errno = 0;
31 d1cda826 2017-11-06 stsp 	lval = strtol(hex, &ep, 16);
32 d1cda826 2017-11-06 stsp 	if (hex[0] == '\0' || *ep != '\0')
33 d1cda826 2017-11-06 stsp 		return 0;
34 d1cda826 2017-11-06 stsp 	if (errno == ERANGE && (lval == LONG_MAX || lval == LONG_MIN))
35 d1cda826 2017-11-06 stsp 		return 0;
36 d1cda826 2017-11-06 stsp 
37 d1cda826 2017-11-06 stsp 	*val = (uint8_t)lval;
38 d1cda826 2017-11-06 stsp 	return 1;
39 d1cda826 2017-11-06 stsp }
40 d1cda826 2017-11-06 stsp 
41 d1cda826 2017-11-06 stsp int
42 d1cda826 2017-11-06 stsp got_parse_sha1_digest(uint8_t *digest, const char *line)
43 d1cda826 2017-11-06 stsp {
44 d1cda826 2017-11-06 stsp 	uint8_t b = 0;
45 d1cda826 2017-11-06 stsp 	char hex[3] = {'\0', '\0', '\0'};
46 d1cda826 2017-11-06 stsp 	int i, j;
47 d1cda826 2017-11-06 stsp 
48 d1cda826 2017-11-06 stsp 	for (i = 0; i < SHA1_DIGEST_LENGTH; i++) {
49 d1cda826 2017-11-06 stsp 		if (line[0] == '\0' || line[1] == '\0')
50 d1cda826 2017-11-06 stsp 			return 0;
51 d1cda826 2017-11-06 stsp 		for (j = 0; j < 2; j++) {
52 d1cda826 2017-11-06 stsp 			hex[j] = *line;
53 d1cda826 2017-11-06 stsp 			line++;
54 d1cda826 2017-11-06 stsp 		}
55 d1cda826 2017-11-06 stsp 		if (!parse_xdigit(&b, hex))
56 d1cda826 2017-11-06 stsp 			return 0;
57 d1cda826 2017-11-06 stsp 		digest[i] = b;
58 d1cda826 2017-11-06 stsp 	}
59 d1cda826 2017-11-06 stsp 
60 d1cda826 2017-11-06 stsp 	return 1;
61 d1cda826 2017-11-06 stsp }
62 a1fd68d8 2018-01-12 stsp 
63 a1fd68d8 2018-01-12 stsp char *
64 a1fd68d8 2018-01-12 stsp got_sha1_digest_to_str(const uint8_t *digest, char *buf, size_t size)
65 a1fd68d8 2018-01-12 stsp {
66 a1fd68d8 2018-01-12 stsp 	char *p = buf;
67 a1fd68d8 2018-01-12 stsp 	char hex[3];
68 a1fd68d8 2018-01-12 stsp 	int i;
69 a1fd68d8 2018-01-12 stsp 
70 a1fd68d8 2018-01-12 stsp 	if (size < SHA1_DIGEST_STRING_LENGTH)
71 a1fd68d8 2018-01-12 stsp 		return NULL;
72 a1fd68d8 2018-01-12 stsp 
73 a1fd68d8 2018-01-12 stsp 	for (i = 0; i < SHA1_DIGEST_LENGTH; i++) {
74 a1fd68d8 2018-01-12 stsp 		snprintf(hex, sizeof(hex), "%.2x", digest[i]);
75 a1fd68d8 2018-01-12 stsp 		p[0] = hex[0];
76 a1fd68d8 2018-01-12 stsp 		p[1] = hex[1];
77 a1fd68d8 2018-01-12 stsp 		p += 2;
78 a1fd68d8 2018-01-12 stsp 	}
79 a1fd68d8 2018-01-12 stsp 	p[0] = '\0';
80 a1fd68d8 2018-01-12 stsp 
81 a1fd68d8 2018-01-12 stsp 	return buf;
82 a1fd68d8 2018-01-12 stsp }