Mercurial > dropbear

annotate libtomcrypt/src/hashes/helper/hash_filehandle.c @ 404:a588558bfc94

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Fix potential null pointer dereference found by Klokwork
author Matt Johnston <matt@ucc.asn.au>
date Sat, 03 Feb 2007 09:58:14 +0000
parents 1b9e69c058d2
children 0cbe8f6dbf9e
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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 "tomcrypt.h"
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12
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13 /**
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14 @file hash_filehandle.c
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15 Hash open files, Tom St Denis
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16 */
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17
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18 /**
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19 Hash data from an open file handle.
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20 @param hash The index of the hash you want to use
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21 @param in The FILE* handle of the file you want to hash
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22 @param out [out] The destination of the digest
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23 @param outlen [in/out] The max size and resulting size of the digest
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24 @result CRYPT_OK if successful
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25 */
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26 int hash_filehandle(int hash, FILE *in, unsigned char *out, unsigned long *outlen)
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27 {
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28 #ifdef LTC_NO_FILE
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29 return CRYPT_NOP;
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30 #else
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31 hash_state md;
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32 unsigned char buf[512];
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33 size_t x;
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34 int err;
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35
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36 LTC_ARGCHK(out != NULL);
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37 LTC_ARGCHK(outlen != NULL);
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38 LTC_ARGCHK(in != NULL);
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39
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40 if ((err = hash_is_valid(hash)) != CRYPT_OK) {
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41 return err;
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42 }
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43
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44 if (*outlen < hash_descriptor[hash].hashsize) {
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45 return CRYPT_BUFFER_OVERFLOW;
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46 }
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47 if ((err = hash_descriptor[hash].init(&md)) != CRYPT_OK) {
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48 return err;
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49 }
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50
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51 *outlen = hash_descriptor[hash].hashsize;
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52 do {
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53 x = fread(buf, 1, sizeof(buf), in);
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54 if ((err = hash_descriptor[hash].process(&md, buf, x)) != CRYPT_OK) {
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55 return err;
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56 }
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57 } while (x == sizeof(buf));
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58 err = hash_descriptor[hash].done(&md, out);
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59
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60 #ifdef LTC_CLEAN_STACK
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61 zeromem(buf, sizeof(buf));
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62 #endif
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63 return err;
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64 #endif
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65 }
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66
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67
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68 /* $Source: /cvs/libtom/libtomcrypt/src/hashes/helper/hash_filehandle.c,v $ */
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69 /* $Revision: 1.3 $ */
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70 /* $Date: 2005/05/05 14:35:58 $ */