Mercurial > dropbear

annotate libtomcrypt/src/hashes/helper/hash_memory.c @ 994:5c5ade336926

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Prefer stronger algorithms in algorithm negotiation. Prefer diffie-hellman-group14-sha1 (2048 bit) over diffie-hellman-group1-sha1 (1024 bit). Due to meet-in-the-middle attacks the effective key length of three key 3DES is 112 bits. AES is stronger and faster then 3DES. Prefer to delay the start of compression until after authentication has completed. This avoids exposing compression code to attacks from unauthenticated users. (github pull request #9)
author Fedor Brunner <fedor.brunner@azet.sk>
date Fri, 23 Jan 2015 23:00:25 +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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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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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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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 $ */