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annotate src/modes/ecb/ecb_decrypt.c @ 209:39d5d58461d6 libtomcrypt-orig LTC_1.05

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Import of libtomcrypt 1.05
author Matt Johnston <matt@ucc.asn.au>
date Wed, 06 Jul 2005 03:53:40 +0000
parents 1c15b283127b
children
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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 ecb_decrypt.c
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15 ECB implementation, decrypt a block, Tom St Denis
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16 */
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17
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18 #ifdef ECB
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19
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20 /**
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21 ECB decrypt
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22 @param ct Ciphertext
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23 @param pt [out] Plaintext
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24 @param len The number of octets to process (must be multiple of the cipher block size)
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25 @param ecb ECB state
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26 @return CRYPT_OK if successful
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27 */
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28 int ecb_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_ECB *ecb)
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29 {
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30 int err;
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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(ecb != NULL);
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34 if ((err = cipher_is_valid(ecb->cipher)) != CRYPT_OK) {
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35 return err;
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36 }
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37 if (len % cipher_descriptor[ecb->cipher].block_length) {
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38 return CRYPT_INVALID_ARG;
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39 }
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40
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41 /* check for accel */
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42 if (cipher_descriptor[ecb->cipher].accel_ecb_decrypt != NULL) {
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43 cipher_descriptor[ecb->cipher].accel_ecb_decrypt(ct, pt, len / cipher_descriptor[ecb->cipher].block_length, &ecb->key);
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44 } else {
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45 while (len) {
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46 cipher_descriptor[ecb->cipher].ecb_decrypt(ct, pt, &ecb->key);
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47 pt += cipher_descriptor[ecb->cipher].block_length;
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48 ct += cipher_descriptor[ecb->cipher].block_length;
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49 len -= cipher_descriptor[ecb->cipher].block_length;
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50 }
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51 }
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52 return CRYPT_OK;
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53 }
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54
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55 #endif
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56
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57 /* $Source: /cvs/libtom/libtomcrypt/src/modes/ecb/ecb_decrypt.c,v $ */
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58 /* $Revision: 1.5 $ */
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59 /* $Date: 2005/05/05 14:35:59 $ */