1 /* $OpenBSD: helper.c,v 1.11 2014/04/03 17:55:27 beck Exp $ */
2
3 /*
4 * Copyright (c) 2000 Poul-Henning Kamp <phk@FreeBSD.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 /*
20 * If we meet some day, and you think this stuff is worth it, you
21 * can buy me a beer in return. Poul-Henning Kamp
22 */
23
24 #include <sys/param.h>
25 #include <sys/stat.h>
26
27 #include <errno.h>
28 #include <fcntl.h>
29 #include <stdlib.h>
30 #include <stdio.h>
31 #include <string.h>
32 #include <unistd.h>
33
34 #include <sha2.h>
35
36 /* ARGSUSED */
37 char *
SHA224End(SHA2_CTX * ctx,char * buf)38 SHA224End(SHA2_CTX *ctx, char *buf)
39 {
40 int i;
41 u_int8_t digest[SHA224_DIGEST_LENGTH];
42 static const char hex[] = "0123456789abcdef";
43
44 if (buf == NULL && (buf = malloc(SHA224_DIGEST_STRING_LENGTH)) == NULL)
45 return (NULL);
46
47 SHA224Final(digest, ctx);
48 for (i = 0; i < SHA224_DIGEST_LENGTH; i++) {
49 buf[i + i] = hex[digest[i] >> 4];
50 buf[i + i + 1] = hex[digest[i] & 0x0f];
51 }
52 buf[i + i] = '\0';
53 memset(digest, 0, sizeof(digest));
54 return (buf);
55 }
56
57 char *
SHA224FileChunk(const char * filename,char * buf,off_t off,off_t len)58 SHA224FileChunk(const char *filename, char *buf, off_t off, off_t len)
59 {
60 struct stat sb;
61 u_char buffer[BUFSIZ];
62 SHA2_CTX ctx;
63 int fd, save_errno;
64 ssize_t nr;
65
66 SHA224Init(&ctx);
67
68 if ((fd = open(filename, O_RDONLY)) < 0)
69 return (NULL);
70 if (len == 0) {
71 if (fstat(fd, &sb) == -1) {
72 close(fd);
73 return (NULL);
74 }
75 len = sb.st_size;
76 }
77 if (off > 0 && lseek(fd, off, SEEK_SET) < 0) {
78 close(fd);
79 return (NULL);
80 }
81
82 while ((nr = read(fd, buffer, MIN(sizeof(buffer), len))) > 0) {
83 SHA224Update(&ctx, buffer, (size_t)nr);
84 if (len > 0 && (len -= nr) == 0)
85 break;
86 }
87
88 save_errno = errno;
89 close(fd);
90 errno = save_errno;
91 return (nr < 0 ? NULL : SHA224End(&ctx, buf));
92 }
93
94 char *
SHA224File(const char * filename,char * buf)95 SHA224File(const char *filename, char *buf)
96 {
97 return (SHA224FileChunk(filename, buf, (off_t)0, (off_t)0));
98 }
99
100 char *
SHA224Data(const u_char * data,size_t len,char * buf)101 SHA224Data(const u_char *data, size_t len, char *buf)
102 {
103 SHA2_CTX ctx;
104
105 SHA224Init(&ctx);
106 SHA224Update(&ctx, data, len);
107 return (SHA224End(&ctx, buf));
108 }
109