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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
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2 * |
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3 * LibTomCrypt is a library that provides various cryptographic |
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4 * algorithms in a highly modular and flexible manner. |
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5 * |
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6 * The library is free for all purposes without any express |
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7 * guarantee it works. |
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8 * |
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9 * Tom St Denis, [email protected], http://libtomcrypt.org |
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10 */ |
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11 #include "mycrypt.h" |
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12 |
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13 int hash_filehandle(int hash, FILE *in, unsigned char *dst, unsigned long *outlen) |
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14 { |
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15 #ifdef NO_FILE |
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16 return CRYPT_NOP; |
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17 #else |
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18 hash_state md; |
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19 unsigned char buf[512]; |
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20 size_t x; |
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21 int err; |
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22 |
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23 _ARGCHK(dst != NULL); |
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24 _ARGCHK(outlen != NULL); |
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25 _ARGCHK(in != NULL); |
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26 |
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27 if ((err = hash_is_valid(hash)) != CRYPT_OK) { |
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28 return err; |
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29 } |
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30 |
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31 if (*outlen < hash_descriptor[hash].hashsize) { |
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32 return CRYPT_BUFFER_OVERFLOW; |
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33 } |
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143
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34 if ((err = hash_descriptor[hash].init(&md)) != CRYPT_OK) { |
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35 return err; |
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36 } |
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37 |
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143
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38 *outlen = hash_descriptor[hash].hashsize; |
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39 do { |
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40 x = fread(buf, 1, sizeof(buf), in); |
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41 if ((err = hash_descriptor[hash].process(&md, buf, x)) != CRYPT_OK) { |
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42 return err; |
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43 } |
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44 } while (x == sizeof(buf)); |
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45 err = hash_descriptor[hash].done(&md, dst); |
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46 |
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47 #ifdef CLEAN_STACK |
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48 zeromem(buf, sizeof(buf)); |
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49 #endif |
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50 return err; |
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51 #endif |
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52 } |
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53 |
