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1899
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1 /*
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2 Copyright (C) Andrew Tridgell 2002
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3
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4 This program is free software; you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 2 of the License, or
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7 (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program; if not, write to the Free Software
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16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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17 */
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18 /*
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19 simple front-end functions to mdfour code
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20 */
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21
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22 #include "ccache.h"
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23
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24 static struct mdfour md;
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25
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26 void hash_buffer(const char *s, int len)
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27 {
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28 mdfour_update(&md, (unsigned char *)s, len);
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29 }
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30
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31 void hash_start(void)
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32 {
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33 mdfour_begin(&md);
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34 }
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35
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36 void hash_string(const char *s)
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37 {
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38 hash_buffer(s, strlen(s));
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39 }
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40
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41 void hash_int(int x)
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42 {
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43 hash_buffer((char *)&x, sizeof(x));
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44 }
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45
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46 /* add contents of a file to the hash */
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47 void hash_file(const char *fname)
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48 {
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49 char buf[1024];
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50 int fd, n;
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51
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52 fd = open(fname, O_RDONLY|O_BINARY);
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53 if (fd == -1) {
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54 cc_log("Failed to open %s\n", fname);
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55 fatal("hash_file");
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56 }
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57
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58 while ((n = read(fd, buf, sizeof(buf))) > 0) {
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59 hash_buffer(buf, n);
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60 }
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61 close(fd);
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62 }
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63
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64 /* return the hash result as a static string */
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65 char *hash_result(void)
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66 {
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67 unsigned char sum[16];
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68 static char ret[53];
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69 int i;
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70
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71 hash_buffer(NULL, 0);
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72 mdfour_result(&md, sum);
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73
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74 for (i=0;i<16;i++) {
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75 sprintf(&ret[i*2], "%02x", (unsigned)sum[i]);
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76 }
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77 sprintf(&ret[i*2], "-%u", (unsigned)md.totalN);
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78
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79 return ret;
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80 }
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