Mercurial > dropbear

annotate libtomcrypt/src/modes/cbc/cbc_start.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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13 /**
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14 @file cbc_start.c
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15 CBC implementation, start chain, Tom St Denis
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16 */
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17
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18 #ifdef LTC_CBC_MODE
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20 /**
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21 Initialize a CBC context
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22 @param cipher The index of the cipher desired
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23 @param IV The initial vector
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24 @param key The secret key
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25 @param keylen The length of the secret key (octets)
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26 @param num_rounds Number of rounds in the cipher desired (0 for default)
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27 @param cbc The CBC state to initialize
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28 @return CRYPT_OK if successful
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29 */
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30 int cbc_start(int cipher, const unsigned char *IV, const unsigned char *key,
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31 int keylen, int num_rounds, symmetric_CBC *cbc)
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32 {
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33 int x, err;
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35 LTC_ARGCHK(IV != NULL);
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36 LTC_ARGCHK(key != NULL);
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37 LTC_ARGCHK(cbc != NULL);
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39 /* bad param? */
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40 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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41 return err;
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42 }
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44 /* setup cipher */
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45 if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &cbc->key)) != CRYPT_OK) {
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46 return err;
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47 }
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49 /* copy IV */
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50 cbc->blocklen = cipher_descriptor[cipher].block_length;
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51 cbc->cipher = cipher;
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52 for (x = 0; x < cbc->blocklen; x++) {
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53 cbc->IV[x] = IV[x];
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54 }
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55 return CRYPT_OK;
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56 }
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58 #endif
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60 /* $Source: /cvs/libtom/libtomcrypt/src/modes/cbc/cbc_start.c,v $ */
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61 /* $Revision: 1.5 $ */
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62 /* $Date: 2006/06/29 01:46:46 $ */