Mercurial > dropbear

annotate libtomcrypt/src/hashes/helper/hash_memory.c @ 1053:fd3712d1ff7f

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Better failure handling
author Matt Johnston <matt@ucc.asn.au>
date Sat, 28 Feb 2015 23:49:39 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
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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.com
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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_memory.c
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15 Hash memory helper, Tom St Denis
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16 */
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17
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18 /**
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19 Hash a block of memory and store the digest.
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20 @param hash The index of the hash you wish to use
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21 @param in The data you wish to hash
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22 @param inlen The length of the data to hash (octets)
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23 @param out [out] Where to store the digest
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24 @param outlen [in/out] Max size and resulting size of the digest
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25 @return CRYPT_OK if successful
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26 */
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27 int hash_memory(int hash, const unsigned char *in, unsigned long inlen, unsigned char *out, unsigned long *outlen)
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28 {
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29 hash_state *md;
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30 int err;
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32 LTC_ARGCHK(in != NULL);
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33 LTC_ARGCHK(out != NULL);
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34 LTC_ARGCHK(outlen != NULL);
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35
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36 if ((err = hash_is_valid(hash)) != CRYPT_OK) {
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37 return err;
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38 }
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39
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40 if (*outlen < hash_descriptor[hash].hashsize) {
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41 *outlen = hash_descriptor[hash].hashsize;
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42 return CRYPT_BUFFER_OVERFLOW;
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43 }
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45 md = XMALLOC(sizeof(hash_state));
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46 if (md == NULL) {
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47 return CRYPT_MEM;
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48 }
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49
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50 if ((err = hash_descriptor[hash].init(md)) != CRYPT_OK) {
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51 goto LBL_ERR;
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52 }
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53 if ((err = hash_descriptor[hash].process(md, in, inlen)) != CRYPT_OK) {
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54 goto LBL_ERR;
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55 }
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56 err = hash_descriptor[hash].done(md, out);
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57 *outlen = hash_descriptor[hash].hashsize;
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58 LBL_ERR:
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59 #ifdef LTC_CLEAN_STACK
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60 zeromem(md, sizeof(hash_state));
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61 #endif
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62 XFREE(md);
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63
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64 return err;
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65 }
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66
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67 /* $Source: /cvs/libtom/libtomcrypt/src/hashes/helper/hash_memory.c,v $ */
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68 /* $Revision: 1.5 $ */
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69 /* $Date: 2006/06/16 21:53:41 $ */