Mercurial > dropbear

annotate libtomcrypt/src/modes/lrw/lrw_setiv.c @ 1844:7a3cd7b598d8

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author Matt Johnston <matt@ucc.asn.au>
date Mon, 18 Oct 2021 23:31:23 +0800
parents 6dba84798cd5
children
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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 #include "tomcrypt.h"
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10
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11 /**
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12 @file lrw_setiv.c
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13 LRW_MODE implementation, Set the current IV, Tom St Denis
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14 */
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15
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16 #ifdef LTC_LRW_MODE
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17
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18 /**
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19 Set the IV for LRW
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20 @param IV The IV, must be 16 octets
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21 @param len Length ... must be 16 :-)
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22 @param lrw The LRW state to update
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23 @return CRYPT_OK if successful
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24 */
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25 int lrw_setiv(const unsigned char *IV, unsigned long len, symmetric_LRW *lrw)
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26 {
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27 int err;
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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28 #ifdef LTC_LRW_TABLES
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29 unsigned char T[16];
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30 int x, y;
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31 #endif
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32 LTC_ARGCHK(IV != NULL);
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33 LTC_ARGCHK(lrw != NULL);
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34
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35 if (len != 16) {
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36 return CRYPT_INVALID_ARG;
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37 }
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38
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39 if ((err = cipher_is_valid(lrw->cipher)) != CRYPT_OK) {
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40 return err;
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41 }
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42
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43 /* copy the IV */
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44 XMEMCPY(lrw->IV, IV, 16);
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45
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46 /* check if we have to actually do work */
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47 if (cipher_descriptor[lrw->cipher].accel_lrw_encrypt != NULL && cipher_descriptor[lrw->cipher].accel_lrw_decrypt != NULL) {
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48 /* we have accelerators, let's bail since they don't use lrw->pad anyways */
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49 return CRYPT_OK;
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50 }
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51
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
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52 #ifdef LTC_LRW_TABLES
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53 XMEMCPY(T, &lrw->PC[0][IV[0]][0], 16);
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54 for (x = 1; x < 16; x++) {
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55 #ifdef LTC_FAST
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56 for (y = 0; y < 16; y += sizeof(LTC_FAST_TYPE)) {
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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57 *(LTC_FAST_TYPE_PTR_CAST(T + y)) ^= *(LTC_FAST_TYPE_PTR_CAST(&lrw->PC[x][IV[x]][y]));
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58 }
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59 #else
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60 for (y = 0; y < 16; y++) {
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61 T[y] ^= lrw->PC[x][IV[x]][y];
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62 }
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63 #endif
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64 }
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65 XMEMCPY(lrw->pad, T, 16);
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
66 #else
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
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67 gcm_gf_mult(lrw->tweak, IV, lrw->pad);
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68 #endif
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69
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70 return CRYPT_OK;
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71 }
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72
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73
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74 #endif
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
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75 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
76 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
77 /* commit time: $Format:%ai$ */