Mercurial > dropbear
annotate libtomcrypt/src/modes/ofb/ofb_start.c @ 908:3ca7113936c1 asm
aes and sha1 for arm
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sun, 06 Oct 2013 21:49:15 +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_start.c |
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15 OFB implementation, start chain, Tom St Denis |
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16 */ |
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17 |
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18 |
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19 #ifdef LTC_OFB_MODE |
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20 |
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21 /** |
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22 Initialize a OFB context |
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23 @param cipher The index of the cipher desired |
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24 @param IV The initial vector |
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25 @param key The secret key |
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26 @param keylen The length of the secret key (octets) |
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27 @param num_rounds Number of rounds in the cipher desired (0 for default) |
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28 @param ofb The OFB state to initialize |
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29 @return CRYPT_OK if successful |
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30 */ |
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31 int ofb_start(int cipher, const unsigned char *IV, const unsigned char *key, |
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32 int keylen, int num_rounds, symmetric_OFB *ofb) |
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33 { |
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34 int x, err; |
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35 |
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36 LTC_ARGCHK(IV != NULL); |
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37 LTC_ARGCHK(key != NULL); |
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38 LTC_ARGCHK(ofb != NULL); |
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39 |
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40 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { |
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41 return err; |
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42 } |
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43 |
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44 /* copy details */ |
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45 ofb->cipher = cipher; |
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46 ofb->blocklen = cipher_descriptor[cipher].block_length; |
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47 for (x = 0; x < ofb->blocklen; x++) { |
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48 ofb->IV[x] = IV[x]; |
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49 } |
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50 |
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51 /* init the cipher */ |
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52 ofb->padlen = ofb->blocklen; |
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53 return cipher_descriptor[cipher].setup(key, keylen, num_rounds, &ofb->key); |
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54 } |
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55 |
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56 #endif |
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57 |
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58 /* $Source: /cvs/libtom/libtomcrypt/src/modes/ofb/ofb_start.c,v $ */ |
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59 /* $Revision: 1.5 $ */ |
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60 /* $Date: 2006/06/29 01:51:34 $ */ |