Mercurial > dropbear

annotate libtomcrypt/src/encauth/ocb/ocb_encrypt.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
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12 /**
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13 @file ocb_encrypt.c
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14 OCB implementation, encrypt data, by Tom St Denis
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15 */
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16 #include "tomcrypt.h"
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17
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18 #ifdef OCB_MODE
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19
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20 /**
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21 Encrypt a block of data with OCB.
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22 @param ocb The OCB state
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23 @param pt The plaintext (length of the block size of the block cipher)
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24 @param ct [out] The ciphertext (same size as the pt)
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25 @return CRYPT_OK if successful
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26 */
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27 int ocb_encrypt(ocb_state *ocb, const unsigned char *pt, unsigned char *ct)
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28 {
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29 unsigned char Z[MAXBLOCKSIZE], tmp[MAXBLOCKSIZE];
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30 int err, x;
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31
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32 LTC_ARGCHK(ocb != NULL);
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33 LTC_ARGCHK(pt != NULL);
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34 LTC_ARGCHK(ct != NULL);
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35 if ((err = cipher_is_valid(ocb->cipher)) != CRYPT_OK) {
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36 return err;
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37 }
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38 if (ocb->block_len != cipher_descriptor[ocb->cipher].block_length) {
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39 return CRYPT_INVALID_ARG;
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40 }
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41
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42 /* compute checksum */
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43 for (x = 0; x < ocb->block_len; x++) {
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44 ocb->checksum[x] ^= pt[x];
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45 }
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47 /* Get Z[i] value */
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48 ocb_shift_xor(ocb, Z);
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49
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50 /* xor pt in, encrypt, xor Z out */
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51 for (x = 0; x < ocb->block_len; x++) {
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52 tmp[x] = pt[x] ^ Z[x];
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53 }
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54 if ((err = cipher_descriptor[ocb->cipher].ecb_encrypt(tmp, ct, &ocb->key)) != CRYPT_OK) {
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55 return err;
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56 }
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57 for (x = 0; x < ocb->block_len; x++) {
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58 ct[x] ^= Z[x];
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59 }
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60
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61 #ifdef LTC_CLEAN_STACK
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62 zeromem(Z, sizeof(Z));
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63 zeromem(tmp, sizeof(tmp));
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64 #endif
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65 return CRYPT_OK;
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66 }
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67
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68 #endif
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69
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70 /* $Source: /cvs/libtom/libtomcrypt/src/encauth/ocb/ocb_encrypt.c,v $ */
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71 /* $Revision: 1.5 $ */
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72 /* $Date: 2006/03/31 14:15:35 $ */