1 |
|
|
/* $OpenBSD: helper.c,v 1.16 2016/09/21 04:38:57 guenther 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/types.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 |
|
|
#define MINIMUM(a, b) (((a) < (b)) ? (a) : (b)) |
37 |
|
|
|
38 |
|
|
char * |
39 |
|
|
SHA256End(SHA2_CTX *ctx, char *buf) |
40 |
|
|
{ |
41 |
|
|
int i; |
42 |
|
188 |
u_int8_t digest[SHA256_DIGEST_LENGTH]; |
43 |
|
|
static const char hex[] = "0123456789abcdef"; |
44 |
|
|
|
45 |
✗✓✗✗
|
94 |
if (buf == NULL && (buf = malloc(SHA256_DIGEST_STRING_LENGTH)) == NULL) |
46 |
|
|
return (NULL); |
47 |
|
|
|
48 |
|
94 |
SHA256Final(digest, ctx); |
49 |
✓✓ |
6204 |
for (i = 0; i < SHA256_DIGEST_LENGTH; i++) { |
50 |
|
3008 |
buf[i + i] = hex[digest[i] >> 4]; |
51 |
|
3008 |
buf[i + i + 1] = hex[digest[i] & 0x0f]; |
52 |
|
|
} |
53 |
|
94 |
buf[i + i] = '\0'; |
54 |
|
94 |
explicit_bzero(digest, sizeof(digest)); |
55 |
|
94 |
return (buf); |
56 |
|
94 |
} |
57 |
|
|
DEF_WEAK(SHA256End); |
58 |
|
|
|
59 |
|
|
char * |
60 |
|
|
SHA256FileChunk(const char *filename, char *buf, off_t off, off_t len) |
61 |
|
|
{ |
62 |
|
|
struct stat sb; |
63 |
|
|
u_char buffer[BUFSIZ]; |
64 |
|
|
SHA2_CTX ctx; |
65 |
|
|
int fd, save_errno; |
66 |
|
|
ssize_t nr; |
67 |
|
|
|
68 |
|
|
SHA256Init(&ctx); |
69 |
|
|
|
70 |
|
|
if ((fd = open(filename, O_RDONLY)) < 0) |
71 |
|
|
return (NULL); |
72 |
|
|
if (len == 0) { |
73 |
|
|
if (fstat(fd, &sb) == -1) { |
74 |
|
|
close(fd); |
75 |
|
|
return (NULL); |
76 |
|
|
} |
77 |
|
|
len = sb.st_size; |
78 |
|
|
} |
79 |
|
|
if (off > 0 && lseek(fd, off, SEEK_SET) < 0) { |
80 |
|
|
close(fd); |
81 |
|
|
return (NULL); |
82 |
|
|
} |
83 |
|
|
|
84 |
|
|
while ((nr = read(fd, buffer, MINIMUM(sizeof(buffer), len))) > 0) { |
85 |
|
|
SHA256Update(&ctx, buffer, nr); |
86 |
|
|
if (len > 0 && (len -= nr) == 0) |
87 |
|
|
break; |
88 |
|
|
} |
89 |
|
|
|
90 |
|
|
save_errno = errno; |
91 |
|
|
close(fd); |
92 |
|
|
errno = save_errno; |
93 |
|
|
return (nr < 0 ? NULL : SHA256End(&ctx, buf)); |
94 |
|
|
} |
95 |
|
|
DEF_WEAK(SHA256FileChunk); |
96 |
|
|
|
97 |
|
|
char * |
98 |
|
|
SHA256File(const char *filename, char *buf) |
99 |
|
|
{ |
100 |
|
|
return (SHA256FileChunk(filename, buf, 0, 0)); |
101 |
|
|
} |
102 |
|
|
DEF_WEAK(SHA256File); |
103 |
|
|
|
104 |
|
|
char * |
105 |
|
|
SHA256Data(const u_char *data, size_t len, char *buf) |
106 |
|
|
{ |
107 |
|
|
SHA2_CTX ctx; |
108 |
|
|
|
109 |
|
|
SHA256Init(&ctx); |
110 |
|
|
SHA256Update(&ctx, data, len); |
111 |
|
|
return (SHA256End(&ctx, buf)); |
112 |
|
|
} |
113 |
|
|
DEF_WEAK(SHA256Data); |