Mercurial > dropbear

annotate libtomcrypt/src/modes/ofb/ofb_start.c @ 687:167fdc091c05

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Improve RNG seeding. Try to read from /dev/urandom multiple times, take input from extra sources, and use /dev/random when generating private keys
author Matt Johnston <matt@ucc.asn.au>
date Fri, 29 Jun 2012 23:19:43 +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 ofb_start.c
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15 OFB implementation, start chain, Tom St Denis
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16 */
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18
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19 #ifdef LTC_OFB_MODE
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21 /**
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22 Initialize a OFB context
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23 @param cipher The index of the cipher desired
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24 @param IV The initial vector
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25 @param key The secret key
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26 @param keylen The length of the secret key (octets)
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27 @param num_rounds Number of rounds in the cipher desired (0 for default)
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28 @param ofb The OFB state to initialize
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29 @return CRYPT_OK if successful
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30 */
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31 int ofb_start(int cipher, const unsigned char *IV, const unsigned char *key,
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32 int keylen, int num_rounds, symmetric_OFB *ofb)
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33 {
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34 int x, err;
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36 LTC_ARGCHK(IV != NULL);
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37 LTC_ARGCHK(key != NULL);
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38 LTC_ARGCHK(ofb != NULL);
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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 /* copy details */
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45 ofb->cipher = cipher;
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46 ofb->blocklen = cipher_descriptor[cipher].block_length;
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47 for (x = 0; x < ofb->blocklen; x++) {
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48 ofb->IV[x] = IV[x];
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49 }
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51 /* init the cipher */
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52 ofb->padlen = ofb->blocklen;
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53 return cipher_descriptor[cipher].setup(key, keylen, num_rounds, &ofb->key);
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54 }
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56 #endif
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58 /* $Source: /cvs/libtom/libtomcrypt/src/modes/ofb/ofb_start.c,v $ */
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59 /* $Revision: 1.5 $ */
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60 /* $Date: 2006/06/29 01:51:34 $ */