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 <sha1.h>
19 #include <sha2.h>
20 #include <errno.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <limits.h>
24 
25 #include "got_compat.h"
26 
27 #include "got_lib_sha1.h"
28 
29 int
30 got_parse_xdigit(uint8_t *val, const char *hex)
31 {
32 	char *ep;
33 	long lval;
34 
35 	errno = 0;
36 	lval = strtol(hex, &ep, 16);
37 	if (hex[0] == '\0' || *ep != '\0')
38 		return 0;
39 	if (errno == ERANGE && (lval == LONG_MAX || lval == LONG_MIN))
40 		return 0;
41 
42 	*val = (uint8_t)lval;
43 	return 1;
44 }
45 
46 int
47 got_parse_sha1_digest(uint8_t *digest, const char *line)
48 {
49 	uint8_t b = 0;
50 	char hex[3] = {'\0', '\0', '\0'};
51 	int i, j;
52 
53 	for (i = 0; i < SHA1_DIGEST_LENGTH; i++) {
54 		if (line[0] == '\0' || line[1] == '\0')
55 			return 0;
56 		for (j = 0; j < 2; j++) {
57 			hex[j] = *line;
58 			line++;
59 		}
60 		if (!got_parse_xdigit(&b, hex))
61 			return 0;
62 		digest[i] = b;
63 	}
64 
65 	return 1;
66 }
67 
68 char *
69 got_sha1_digest_to_str(const uint8_t *digest, char *buf, size_t size)
70 {
71 	char *p = buf;
72 	char hex[3];
73 	int i;
74 
75 	if (size < SHA1_DIGEST_STRING_LENGTH)
76 		return NULL;
77 
78 	for (i = 0; i < SHA1_DIGEST_LENGTH; i++) {
79 		snprintf(hex, sizeof(hex), "%.2x", digest[i]);
80 		p[0] = hex[0];
81 		p[1] = hex[1];
82 		p += 2;
83 	}
84 	p[0] = '\0';
85 
86 	return buf;
87 }