Mercurial > dropbear
annotate libtomcrypt/src/modes/ctr/ctr_setiv.c @ 1938:77bc00dcc19f default tip main master
Bump version to 2022.82
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 01 Apr 2022 14:43:27 +0800 (2022-04-01) |
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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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10 |
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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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15 |
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16 #ifdef LTC_CTR_MODE |
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17 |
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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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28 |
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29 LTC_ARGCHK(IV != NULL); |
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30 LTC_ARGCHK(ctr != NULL); |
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31 |
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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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36 |
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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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40 |
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41 /* set IV */ |
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42 XMEMCPY(ctr->ctr, IV, len); |
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43 |
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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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48 |
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49 #endif |
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50 |
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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: $Format:%ai$ */ |