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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 lrw_decrypt.c |
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15 LRW_MODE implementation, Decrypt blocks, Tom St Denis |
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16 */ |
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17 |
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18 #ifdef LTC_LRW_MODE |
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19 |
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20 /** |
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21 LRW decrypt blocks |
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22 @param ct The ciphertext |
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23 @param pt [out] The plaintext |
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24 @param len The length in octets, must be a multiple of 16 |
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25 @param lrw The LRW state |
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26 */ |
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27 int lrw_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_LRW *lrw) |
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28 { |
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29 int err; |
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30 |
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31 LTC_ARGCHK(pt != NULL); |
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32 LTC_ARGCHK(ct != NULL); |
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33 LTC_ARGCHK(lrw != NULL); |
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34 |
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35 if ((err = cipher_is_valid(lrw->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 (cipher_descriptor[lrw->cipher].accel_lrw_decrypt != NULL) { |
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40 return cipher_descriptor[lrw->cipher].accel_lrw_decrypt(ct, pt, len, lrw->IV, lrw->tweak, &lrw->key); |
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41 } |
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42 |
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43 return lrw_process(ct, pt, len, LRW_DECRYPT, lrw); |
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44 } |
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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 /* $Source: /cvs/libtom/libtomcrypt/src/modes/lrw/lrw_decrypt.c,v $ */ |
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50 /* $Revision: 1.8 $ */ |
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51 /* $Date: 2006/06/29 01:53:13 $ */ |
