Mercurial > dropbear

annotate libtomcrypt/src/modes/lrw/lrw_setiv.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
382
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diff changeset
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_setiv.c
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15 LRW_MODE implementation, Set the current IV, 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 Set the IV for LRW
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22 @param IV The IV, must be 16 octets
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23 @param len Length ... must be 16 :-)
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24 @param lrw The LRW state to update
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25 @return CRYPT_OK if successful
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26 */
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27 int lrw_setiv(const unsigned char *IV, unsigned long len, symmetric_LRW *lrw)
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28 {
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29 int err;
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30 #ifdef LRW_TABLES
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31 unsigned char T[16];
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32 int x, y;
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33 #endif
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34 LTC_ARGCHK(IV != NULL);
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35 LTC_ARGCHK(lrw != NULL);
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36
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37 if (len != 16) {
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38 return CRYPT_INVALID_ARG;
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39 }
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40
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41 if ((err = cipher_is_valid(lrw->cipher)) != CRYPT_OK) {
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42 return err;
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43 }
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44
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45 /* copy the IV */
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46 XMEMCPY(lrw->IV, IV, 16);
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47
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48 /* check if we have to actually do work */
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49 if (cipher_descriptor[lrw->cipher].accel_lrw_encrypt != NULL && cipher_descriptor[lrw->cipher].accel_lrw_decrypt != NULL) {
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50 /* we have accelerators, let's bail since they don't use lrw->pad anyways */
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51 return CRYPT_OK;
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52 }
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53
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54 #ifdef LRW_TABLES
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55 XMEMCPY(T, &lrw->PC[0][IV[0]][0], 16);
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56 for (x = 1; x < 16; x++) {
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57 #ifdef LTC_FAST
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58 for (y = 0; y < 16; y += sizeof(LTC_FAST_TYPE)) {
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59 *((LTC_FAST_TYPE *)(T + y)) ^= *((LTC_FAST_TYPE *)(&lrw->PC[x][IV[x]][y]));
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60 }
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61 #else
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62 for (y = 0; y < 16; y++) {
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63 T[y] ^= lrw->PC[x][IV[x]][y];
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64 }
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65 #endif
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66 }
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67 XMEMCPY(lrw->pad, T, 16);
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68 #else
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69 gcm_gf_mult(lrw->tweak, IV, lrw->pad);
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70 #endif
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71
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72 return CRYPT_OK;
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73 }
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74
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75
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76 #endif
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77 /* $Source: /cvs/libtom/libtomcrypt/src/modes/lrw/lrw_setiv.c,v $ */
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78 /* $Revision: 1.12 $ */
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79 /* $Date: 2006/06/29 01:53:13 $ */