Mercurial > dropbear
annotate libtomcrypt/src/modes/ctr/ctr_setiv.c @ 289:497fddd4a94e
code was untested and wrong.
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 08 Mar 2006 15:46:24 +0000 |
parents | 1b9e69c058d2 |
children | 0cbe8f6dbf9e |
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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 |
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55 |
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56 /* $Source: /cvs/libtom/libtomcrypt/src/modes/ctr/ctr_setiv.c,v $ */ |
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57 /* $Revision: 1.3 $ */ |
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58 /* $Date: 2005/05/05 14:35:59 $ */ |