Mercurial > dropbear

annotate libtomcrypt/src/modes/cfb/cfb_getiv.c @ 1820:e9854650d45b

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Clarify help text for dropbear -e environment option
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Aug 2021 23:17:34 +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_getiv.c
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13 CFB implementation, get IV, Tom St Denis
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14 */
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16 #ifdef LTC_CFB_MODE
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18 /**
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19 Get the current initialization vector
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20 @param IV [out] The destination of the initialization vector
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21 @param len [in/out] The max size and resulting size of the initialization vector
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22 @param cfb The CFB state
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23 @return CRYPT_OK if successful
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24 */
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25 int cfb_getiv(unsigned char *IV, unsigned long *len, symmetric_CFB *cfb)
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26 {
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27 LTC_ARGCHK(IV != NULL);
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28 LTC_ARGCHK(len != NULL);
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29 LTC_ARGCHK(cfb != NULL);
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30 if ((unsigned long)cfb->blocklen > *len) {
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31 *len = cfb->blocklen;
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32 return CRYPT_BUFFER_OVERFLOW;
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33 }
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34 XMEMCPY(IV, cfb->IV, cfb->blocklen);
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35 *len = cfb->blocklen;
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37 return CRYPT_OK;
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38 }
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40 #endif
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41
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42 /* ref: $Format:%D$ */
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43 /* git commit: $Format:%H$ */
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44 /* commit time: $Format:%ai$ */