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annotate src/modes/ctr/ctr_setiv.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_setiv.c
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15 CTR implementation, set IV, Tom St Denis
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16 */
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17
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18 #ifdef CTR
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19
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20 /**
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21 Set an initial vector
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22 @param IV The initial vector
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23 @param len The length of the vector (in octets)
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24 @param ctr The CTR state
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25 @return CRYPT_OK if successful
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26 */
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27 int ctr_setiv(const unsigned char *IV, unsigned long len, symmetric_CTR *ctr)
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28 {
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29 int err;
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30
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31 LTC_ARGCHK(IV != NULL);
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32 LTC_ARGCHK(ctr != NULL);
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33
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34 /* bad param? */
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35 if ((err = cipher_is_valid(ctr->cipher)) != CRYPT_OK) {
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36 return err;
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37 }
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38
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39 if (len != (unsigned long)ctr->blocklen) {
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40 return CRYPT_INVALID_ARG;
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41 }
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42
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43 /* set IV */
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44 XMEMCPY(ctr->ctr, IV, len);
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45
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46 /* force next block */
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47 ctr->padlen = 0;
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48 cipher_descriptor[ctr->cipher].ecb_encrypt(IV, ctr->pad, &ctr->key);
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49
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50 return CRYPT_OK;
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51 }
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52
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53 #endif
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54