Mercurial > dropbear
annotate libtomcrypt/src/modes/ofb/ofb_setiv.c @ 789:ea04e3eb03e2
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author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 18 Apr 2013 23:15:17 +0800 |
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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.com |
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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 ofb_setiv.c |
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15 OFB implementation, set IV, Tom St Denis |
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16 */ |
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17 |
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18 #ifdef LTC_OFB_MODE |
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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 ofb The OFB state |
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25 @return CRYPT_OK if successful |
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26 */ |
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27 int ofb_setiv(const unsigned char *IV, unsigned long len, symmetric_OFB *ofb) |
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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(ofb != NULL); |
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33 |
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34 if ((err = cipher_is_valid(ofb->cipher)) != CRYPT_OK) { |
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35 return err; |
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36 } |
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37 |
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38 if (len != (unsigned long)ofb->blocklen) { |
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39 return CRYPT_INVALID_ARG; |
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40 } |
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41 |
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42 /* force next block */ |
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43 ofb->padlen = 0; |
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44 return cipher_descriptor[ofb->cipher].ecb_encrypt(IV, ofb->IV, &ofb->key); |
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45 } |
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46 |
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47 #endif |
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48 |
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49 |
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50 /* $Source: /cvs/libtom/libtomcrypt/src/modes/ofb/ofb_setiv.c,v $ */ |
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51 /* $Revision: 1.6 $ */ |
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52 /* $Date: 2006/06/29 01:51:34 $ */ |