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annotate hash_filehandle.c @ 18:712dd6dfb0eb libtomcrypt

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makefile
author Matt Johnston <matt@ucc.asn.au>
date Tue, 15 Jun 2004 14:34:07 +0000
parents d7da3b1e1540
children 5d99163f7e32
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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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34 *outlen = hash_descriptor[hash].hashsize;
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35
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36 hash_descriptor[hash].init(&md);
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37 do {
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38 x = fread(buf, 1, sizeof(buf), in);
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39 hash_descriptor[hash].process(&md, buf, x);
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40 } while (x == sizeof(buf));
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41 hash_descriptor[hash].done(&md, dst);
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42
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43 #ifdef CLEAN_STACK
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44 zeromem(buf, sizeof(buf));
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45 #endif
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46 return CRYPT_OK;
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47 #endif
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48 }
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