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annotate src/modes/ctr/ctr_start.c @ 191:1c15b283127b libtomcrypt-orig

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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
author Matt Johnston <matt@ucc.asn.au>
date Fri, 06 May 2005 13:23:02 +0000
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children 39d5d58461d6
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191
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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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.org
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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 ctr_start.c
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15 CTR implementation, start chain, Tom St Denis
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16 */
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17
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18
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19 #ifdef CTR
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20
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21 /**
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22 Initialize a CTR context
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23 @param cipher The index of the cipher desired
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24 @param count 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 ctr The CTR state to initialize
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29 @return CRYPT_OK if successful
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30 */
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31 int ctr_start(int cipher, const unsigned char *count, const unsigned char *key, int keylen,
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32 int num_rounds, symmetric_CTR *ctr)
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33 {
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34 int x, err;
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35
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36 LTC_ARGCHK(count != NULL);
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37 LTC_ARGCHK(key != NULL);
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38 LTC_ARGCHK(ctr != NULL);
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39
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40 /* bad param? */
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41 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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42 return err;
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43 }
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44
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45 /* setup cipher */
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46 if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &ctr->key)) != CRYPT_OK) {
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47 return err;
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48 }
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49
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50 /* copy ctr */
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51 ctr->blocklen = cipher_descriptor[cipher].block_length;
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52 ctr->cipher = cipher;
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53 ctr->padlen = 0;
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54 ctr->mode = 0;
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55 for (x = 0; x < ctr->blocklen; x++) {
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56 ctr->ctr[x] = count[x];
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57 }
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58 cipher_descriptor[ctr->cipher].ecb_encrypt(ctr->ctr, ctr->pad, &ctr->key);
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59 return CRYPT_OK;
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60 }
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61
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62 #endif