about summary refs log tree commit diff
path: root/src/liboutils/md5hl.c
blob: 3fd30b9b0fc3eb8c7a63285c1aa80757655052dd (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
/*	$OpenBSD: helper.c,v 1.11 2014/04/03 17:55:27 beck Exp $ */

/*
 * Copyright (c) 2000 Poul-Henning Kamp <phk@FreeBSD.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/*
 * If we meet some day, and you think this stuff is worth it, you
 * can buy me a beer in return. Poul-Henning Kamp
 */

#include <sys/param.h>
#include <sys/stat.h>

#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

#include <md5.h>

/* ARGSUSED */
char *
MD5End(MD5_CTX *ctx, char *buf)
{
	int i;
	u_int8_t digest[MD5_DIGEST_LENGTH];
	static const char hex[] = "0123456789abcdef";

	if (buf == NULL && (buf = malloc(MD5_DIGEST_STRING_LENGTH)) == NULL)
		return (NULL);

	MD5Final(digest, ctx);
	for (i = 0; i < MD5_DIGEST_LENGTH; i++) {
		buf[i + i] = hex[digest[i] >> 4];
		buf[i + i + 1] = hex[digest[i] & 0x0f];
	}
	buf[i + i] = '\0';
	memset(digest, 0, sizeof(digest));
	return (buf);
}

char *
MD5FileChunk(const char *filename, char *buf, off_t off, off_t len)
{
	struct stat sb;
	u_char buffer[BUFSIZ];
	MD5_CTX ctx;
	int fd, save_errno;
	ssize_t nr;

	MD5Init(&ctx);

	if ((fd = open(filename, O_RDONLY)) < 0)
		return (NULL);
	if (len == 0) {
		if (fstat(fd, &sb) == -1) {
			close(fd);
			return (NULL);
		}
		len = sb.st_size;
	}
	if (off > 0 && lseek(fd, off, SEEK_SET) < 0) {
		close(fd);
		return (NULL);
	}

	while ((nr = read(fd, buffer, MIN(sizeof(buffer), len))) > 0) {
		MD5Update(&ctx, buffer, (size_t)nr);
		if (len > 0 && (len -= nr) == 0)
			break;
	}

	save_errno = errno;
	close(fd);
	errno = save_errno;
	return (nr < 0 ? NULL : MD5End(&ctx, buf));
}

char *
MD5File(const char *filename, char *buf)
{
	return (MD5FileChunk(filename, buf, (off_t)0, (off_t)0));
}

char *
MD5Data(const u_char *data, size_t len, char *buf)
{
	MD5_CTX ctx;

	MD5Init(&ctx);
	MD5Update(&ctx, data, len);
	return (MD5End(&ctx, buf));
}