Mercurial > dropbear

annotate libtomcrypt/src/modes/ecb/ecb_decrypt.c @ 447:278805938dcf

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Patch from Nicolai Ehemann to try binding before going to the background, so that if it exits early (because something's already listening etc) then it will return an exitcode of 1.
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Jul 2007 15:54:18 +0000
parents 0cbe8f6dbf9e
children f849a5ca2efc
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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 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 LTC_ECB_MODE
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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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41 /* check for accel */
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42 if (cipher_descriptor[ecb->cipher].accel_ecb_decrypt != NULL) {
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43 return 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 if ((err = cipher_descriptor[ecb->cipher].ecb_decrypt(ct, pt, &ecb->key)) != CRYPT_OK) {
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47 return err;
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48 }
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49 pt += cipher_descriptor[ecb->cipher].block_length;
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50 ct += cipher_descriptor[ecb->cipher].block_length;
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51 len -= cipher_descriptor[ecb->cipher].block_length;
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52 }
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53 }
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54 return CRYPT_OK;
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55 }
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56
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57 #endif
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58
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59 /* $Source: /cvs/libtom/libtomcrypt/src/modes/ecb/ecb_decrypt.c,v $ */
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60 /* $Revision: 1.9 $ */
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61 /* $Date: 2006/06/29 01:51:34 $ */