Mercurial > dropbear

annotate libtomcrypt/src/modes/ctr/ctr_setiv.c @ 1929:315dbcef7293

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Update to latest config.guess and config.sub
author Matt Johnston <matt@ucc.asn.au>
date Wed, 30 Mar 2022 21:42:23 +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 ctr_setiv.c
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13 CTR implementation, set IV, Tom St Denis
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14 */
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16 #ifdef LTC_CTR_MODE
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18 /**
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19 Set an initialization vector
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20 @param IV The initialization vector
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21 @param len The length of the vector (in octets)
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22 @param ctr The CTR state
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23 @return CRYPT_OK if successful
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24 */
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25 int ctr_setiv(const unsigned char *IV, unsigned long len, symmetric_CTR *ctr)
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26 {
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27 int err;
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29 LTC_ARGCHK(IV != NULL);
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30 LTC_ARGCHK(ctr != NULL);
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32 /* bad param? */
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33 if ((err = cipher_is_valid(ctr->cipher)) != CRYPT_OK) {
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34 return err;
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35 }
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37 if (len != (unsigned long)ctr->blocklen) {
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38 return CRYPT_INVALID_ARG;
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39 }
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41 /* set IV */
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42 XMEMCPY(ctr->ctr, IV, len);
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44 /* force next block */
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45 ctr->padlen = 0;
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46 return cipher_descriptor[ctr->cipher].ecb_encrypt(IV, ctr->pad, &ctr->key);
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47 }
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49 #endif
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51
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52 /* ref: $Format:%D$ */
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53 /* git commit: $Format:%H$ */
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54 /* commit time: $Format:%ai$ */