Mercurial > dropbear

annotate libtomcrypt/src/modes/cfb/cfb_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 cfb_decrypt.c
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15 CFB implementation, decrypt data, Tom St Denis
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16 */
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17
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18 #ifdef LTC_CFB_MODE
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20 /**
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21 CFB 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 Length of ciphertext (octets)
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25 @param cfb CFB state
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26 @return CRYPT_OK if successful
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27 */
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28 int cfb_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_CFB *cfb)
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29 {
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30 int err;
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31
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32 LTC_ARGCHK(pt != NULL);
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33 LTC_ARGCHK(ct != NULL);
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34 LTC_ARGCHK(cfb != NULL);
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35
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36 if ((err = cipher_is_valid(cfb->cipher)) != CRYPT_OK) {
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37 return err;
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38 }
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39
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40 /* is blocklen/padlen valid? */
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41 if (cfb->blocklen < 0 || cfb->blocklen > (int)sizeof(cfb->IV) ||
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42 cfb->padlen < 0 || cfb->padlen > (int)sizeof(cfb->pad)) {
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43 return CRYPT_INVALID_ARG;
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44 }
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45
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46 while (len-- > 0) {
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47 if (cfb->padlen == cfb->blocklen) {
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48 if ((err = cipher_descriptor[cfb->cipher].ecb_encrypt(cfb->pad, cfb->IV, &cfb->key)) != CRYPT_OK) {
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49 return err;
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50 }
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51 cfb->padlen = 0;
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52 }
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53 cfb->pad[cfb->padlen] = *ct;
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54 *pt = *ct ^ cfb->IV[cfb->padlen];
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55 ++pt;
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56 ++ct;
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57 ++(cfb->padlen);
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58 }
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59 return CRYPT_OK;
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60 }
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61
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62 #endif
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64
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65 /* $Source: /cvs/libtom/libtomcrypt/src/modes/cfb/cfb_decrypt.c,v $ */
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66 /* $Revision: 1.7 $ */
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67 /* $Date: 2006/11/26 01:45:14 $ */