DRC | 0bf58f2 | 2013-02-06 23:51:08 +0000 | [diff] [blame] | 1 | /* mdXhl.c * ---------------------------------------------------------------------------- |
| 2 | * "THE BEER-WARE LICENSE" (Revision 42): |
| 3 | * <phk@FreeBSD.org> wrote this file. As long as you retain this notice you |
| 4 | * can do whatever you want with this stuff. If we meet some day, and you think |
| 5 | * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp |
| 6 | * ---------------------------------------------------------------------------- |
| 7 | */ |
| 8 | |
DRC | 0bf58f2 | 2013-02-06 23:51:08 +0000 | [diff] [blame] | 9 | #include <sys/types.h> |
| 10 | #include <sys/stat.h> |
| 11 | #include <fcntl.h> |
| 12 | #include <unistd.h> |
| 13 | |
| 14 | #include <errno.h> |
| 15 | #include <stdio.h> |
| 16 | #include <stdlib.h> |
| 17 | |
| 18 | #define LENGTH 16 |
| 19 | |
| 20 | #include "./md5.h" |
| 21 | |
| 22 | char * |
| 23 | MD5End(MD5_CTX *ctx, char *buf) |
| 24 | { |
| 25 | int i; |
| 26 | unsigned char digest[LENGTH]; |
| 27 | static const char hex[]="0123456789abcdef"; |
| 28 | |
| 29 | if (!buf) |
| 30 | buf = malloc(2*LENGTH + 1); |
| 31 | if (!buf) |
| 32 | return 0; |
| 33 | MD5Final(digest, ctx); |
| 34 | for (i = 0; i < LENGTH; i++) { |
| 35 | buf[i+i] = hex[digest[i] >> 4]; |
| 36 | buf[i+i+1] = hex[digest[i] & 0x0f]; |
| 37 | } |
| 38 | buf[i+i] = '\0'; |
| 39 | return buf; |
| 40 | } |
| 41 | |
| 42 | char * |
| 43 | MD5File(const char *filename, char *buf) |
| 44 | { |
| 45 | return (MD5FileChunk(filename, buf, 0, 0)); |
| 46 | } |
| 47 | |
| 48 | char * |
| 49 | MD5FileChunk(const char *filename, char *buf, off_t ofs, off_t len) |
| 50 | { |
| 51 | unsigned char buffer[BUFSIZ]; |
| 52 | MD5_CTX ctx; |
| 53 | struct stat stbuf; |
| 54 | int f, i, e; |
| 55 | off_t n; |
| 56 | |
| 57 | MD5Init(&ctx); |
| 58 | f = open(filename, O_RDONLY); |
| 59 | if (f < 0) |
| 60 | return 0; |
| 61 | if (fstat(f, &stbuf) < 0) |
| 62 | return 0; |
| 63 | if (ofs > stbuf.st_size) |
| 64 | ofs = stbuf.st_size; |
| 65 | if ((len == 0) || (len > stbuf.st_size - ofs)) |
| 66 | len = stbuf.st_size - ofs; |
| 67 | if (lseek(f, ofs, SEEK_SET) < 0) |
| 68 | return 0; |
| 69 | n = len; |
| 70 | i = 0; |
| 71 | while (n > 0) { |
| 72 | if (n > sizeof(buffer)) |
| 73 | i = read(f, buffer, sizeof(buffer)); |
| 74 | else |
| 75 | i = read(f, buffer, n); |
| 76 | if (i < 0) |
| 77 | break; |
| 78 | MD5Update(&ctx, buffer, i); |
| 79 | n -= i; |
| 80 | } |
| 81 | e = errno; |
| 82 | close(f); |
| 83 | errno = e; |
| 84 | if (i < 0) |
| 85 | return 0; |
| 86 | return (MD5End(&ctx, buf)); |
| 87 | } |
| 88 | |
| 89 | char * |
| 90 | MD5Data (const void *data, unsigned int len, char *buf) |
| 91 | { |
| 92 | MD5_CTX ctx; |
| 93 | |
| 94 | MD5Init(&ctx); |
| 95 | MD5Update(&ctx,data,len); |
| 96 | return (MD5End(&ctx, buf)); |
| 97 | } |