Mercurial > dropbear

annotate libtomcrypt/src/modes/cfb/cfb_start.c @ 1514:6c16a05023aa

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rename some options and move some to sysoptions.h
author Matt Johnston <matt@ucc.asn.au>
date Sun, 18 Feb 2018 00:29:17 +0800
parents 6dba84798cd5
children
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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 #include "tomcrypt.h"
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11 /**
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12 @file cfb_start.c
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13 CFB implementation, start chain, Tom St Denis
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14 */
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17 #ifdef LTC_CFB_MODE
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19 /**
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20 Initialize a CFB context
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21 @param cipher The index of the cipher desired
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22 @param IV The initialization vector
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23 @param key The secret key
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24 @param keylen The length of the secret key (octets)
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25 @param num_rounds Number of rounds in the cipher desired (0 for default)
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26 @param cfb The CFB state to initialize
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27 @return CRYPT_OK if successful
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28 */
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29 int cfb_start(int cipher, const unsigned char *IV, const unsigned char *key,
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30 int keylen, int num_rounds, symmetric_CFB *cfb)
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31 {
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32 int x, err;
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34 LTC_ARGCHK(IV != NULL);
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35 LTC_ARGCHK(key != NULL);
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36 LTC_ARGCHK(cfb != NULL);
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38 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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39 return err;
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40 }
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43 /* copy data */
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44 cfb->cipher = cipher;
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45 cfb->blocklen = cipher_descriptor[cipher].block_length;
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46 for (x = 0; x < cfb->blocklen; x++)
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47 cfb->IV[x] = IV[x];
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49 /* init the cipher */
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50 if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &cfb->key)) != CRYPT_OK) {
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51 return err;
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52 }
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54 /* encrypt the IV */
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55 cfb->padlen = 0;
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56 return cipher_descriptor[cfb->cipher].ecb_encrypt(cfb->IV, cfb->IV, &cfb->key);
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57 }
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59 #endif
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60
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61 /* ref: $Format:%D$ */
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62 /* git commit: $Format:%H$ */
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63 /* commit time: $Format:%ai$ */