Mercurial > dropbear
annotate libtomcrypt/src/modes/cfb/cfb_start.c @ 1893:180e580778df
Added DEBUG1,DEBUG2,DEBUG3 to separate functions while keeping TRACE and TRACE2.
author | HansH111 <hans@atbas.org> |
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date | Sat, 19 Mar 2022 09:01:05 +0000 |
parents | 6dba84798cd5 |
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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 cfb_start.c |
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13 CFB implementation, start chain, Tom St Denis |
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14 */ |
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15 |
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16 |
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17 #ifdef LTC_CFB_MODE |
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18 |
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19 /** |
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20 Initialize a CFB context |
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21 @param cipher The index of the cipher desired |
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22 @param IV The initialization vector |
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23 @param key The secret key |
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24 @param keylen The length of the secret key (octets) |
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25 @param num_rounds Number of rounds in the cipher desired (0 for default) |
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26 @param cfb The CFB state to initialize |
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27 @return CRYPT_OK if successful |
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28 */ |
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29 int cfb_start(int cipher, const unsigned char *IV, const unsigned char *key, |
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30 int keylen, int num_rounds, symmetric_CFB *cfb) |
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31 { |
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32 int x, err; |
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33 |
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34 LTC_ARGCHK(IV != NULL); |
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35 LTC_ARGCHK(key != NULL); |
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36 LTC_ARGCHK(cfb != NULL); |
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37 |
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38 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { |
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39 return err; |
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40 } |
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41 |
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42 |
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43 /* copy data */ |
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44 cfb->cipher = cipher; |
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45 cfb->blocklen = cipher_descriptor[cipher].block_length; |
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46 for (x = 0; x < cfb->blocklen; x++) |
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47 cfb->IV[x] = IV[x]; |
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48 |
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49 /* init the cipher */ |
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50 if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &cfb->key)) != CRYPT_OK) { |
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51 return err; |
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52 } |
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53 |
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54 /* encrypt the IV */ |
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55 cfb->padlen = 0; |
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56 return cipher_descriptor[cfb->cipher].ecb_encrypt(cfb->IV, cfb->IV, &cfb->key); |
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57 } |
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58 |
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59 #endif |
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60 |
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61 /* ref: $Format:%D$ */ |
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62 /* git commit: $Format:%H$ */ |
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63 /* commit time: $Format:%ai$ */ |