1 /*
2  * Copyright (c) 2018 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 <errno.h>
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <limits.h>
22 
23 #include "got_compat.h"
24 
25 #include "got_lib_sha1.h"
26 
27 int
28 got_parse_xdigit(uint8_t *val, const char *hex)
29 {
30 	char *ep;
31 	long lval;
32 
33 	errno = 0;
34 	lval = strtol(hex, &ep, 16);
35 	if (hex[0] == '\0' || *ep != '\0')
36 		return 0;
37 	if (errno == ERANGE && (lval == LONG_MAX || lval == LONG_MIN))
38 		return 0;
39 
40 	*val = (uint8_t)lval;
41 	return 1;
42 }
43 
44 int
45 got_parse_sha1_digest(uint8_t *digest, const char *line)
46 {
47 	uint8_t b = 0;
48 	char hex[3] = {'\0', '\0', '\0'};
49 	int i, j;
50 
51 	for (i = 0; i < SHA1_DIGEST_LENGTH; i++) {
52 		if (line[0] == '\0' || line[1] == '\0')
53 			return 0;
54 		for (j = 0; j < 2; j++) {
55 			hex[j] = *line;
56 			line++;
57 		}
58 		if (!got_parse_xdigit(&b, hex))
59 			return 0;
60 		digest[i] = b;
61 	}
62 
63 	return 1;
64 }
65 
66 char *
67 got_sha1_digest_to_str(const uint8_t *digest, char *buf, size_t size)
68 {
69 	char *p = buf;
70 	char hex[3];
71 	int i;
72 
73 	if (size < SHA1_DIGEST_STRING_LENGTH)
74 		return NULL;
75 
76 	for (i = 0; i < SHA1_DIGEST_LENGTH; i++) {
77 		snprintf(hex, sizeof(hex), "%.2x", digest[i]);
78 		p[0] = hex[0];
79 		p[1] = hex[1];
80 		p += 2;
81 	}
82 	p[0] = '\0';
83 
84 	return buf;
85 }