Mercurial > dropbear

annotate libtomcrypt/src/modes/lrw/lrw_setiv.c @ 709:abd99ecd7ec2

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use an empty writebuf rather than a NULL one
author Matt Johnston <matt@ucc.asn.au>
date Wed, 20 Mar 2013 22:31:07 +0800
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 $ */