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annotate libtomcrypt/src/modes/xts/xts_init.c @ 1435:f849a5ca2efc

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update to libtomcrypt 1.17 (with Dropbear changes)
author Matt Johnston <matt@ucc.asn.au>
date Sat, 24 Jun 2017 17:50:50 +0800
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children 6dba84798cd5
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1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
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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://libtom.org
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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 Source donated by Elliptic Semiconductor Inc (www.ellipticsemi.com) to the LibTom Projects
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15 */
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16
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17 #ifdef LTC_XTS_MODE
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18
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19
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20 /** Start XTS mode
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21 @param cipher The index of the cipher to use
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22 @param key1 The encrypt key
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23 @param key2 The tweak encrypt key
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24 @param keylen The length of the keys (each) in octets
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25 @param num_rounds The number of rounds for the cipher (0 == default)
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26 @param xts [out] XTS structure
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27 Returns CRYPT_OK upon success.
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28 */
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29 int xts_start( int cipher,
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30 const unsigned char *key1,
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31 const unsigned char *key2,
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32 unsigned long keylen,
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33 int num_rounds,
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34 symmetric_xts *xts)
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35 {
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36 int err;
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37
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38 /* check inputs */
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39 LTC_ARGCHK(key1 != NULL);
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40 LTC_ARGCHK(key2 != NULL);
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41 LTC_ARGCHK(xts != NULL);
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42
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43 /* check if valid */
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44 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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45 return err;
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46 }
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47
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48 if (cipher_descriptor[cipher].block_length != 16) {
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49 return CRYPT_INVALID_ARG;
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50 }
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51
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52 /* schedule the two ciphers */
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53 if ((err = cipher_descriptor[cipher].setup(key1, keylen, num_rounds, &xts->key1)) != CRYPT_OK) {
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54 return err;
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55 }
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56 if ((err = cipher_descriptor[cipher].setup(key2, keylen, num_rounds, &xts->key2)) != CRYPT_OK) {
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57 return err;
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58 }
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59 xts->cipher = cipher;
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60
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61 return err;
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62 }
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63
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64 #endif
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65
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66 /* $Source$ */
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67 /* $Revision$ */
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68 /* $Date$ */
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69