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