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annotate libtomcrypt/src/modes/xts/xts_init.c @ 1690:2a06ef4ba80d

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author Matt Johnston <matt@ucc.asn.au>
date Tue, 26 May 2020 23:16:11 +0800
parents 6dba84798cd5
children
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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 #include "tomcrypt.h"
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10
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11 /**
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12 Source donated by Elliptic Semiconductor Inc (www.ellipticsemi.com) to the LibTom Projects
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13 */
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14
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15 #ifdef LTC_XTS_MODE
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16
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17 /** Start XTS mode
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18 @param cipher The index of the cipher to use
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19 @param key1 The encrypt key
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20 @param key2 The tweak encrypt key
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21 @param keylen The length of the keys (each) in octets
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22 @param num_rounds The number of rounds for the cipher (0 == default)
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23 @param xts [out] XTS structure
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24 Returns CRYPT_OK upon success.
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25 */
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26 int xts_start(int cipher, const unsigned char *key1, const unsigned char *key2, unsigned long keylen, int num_rounds,
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27 symmetric_xts *xts)
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28 {
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29 int err;
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30
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31 /* check inputs */
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32 LTC_ARGCHK(key1 != NULL);
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33 LTC_ARGCHK(key2 != NULL);
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34 LTC_ARGCHK(xts != NULL);
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35
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36 /* check if valid */
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37 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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38 return err;
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39 }
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40
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41 if (cipher_descriptor[cipher].block_length != 16) {
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42 return CRYPT_INVALID_ARG;
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43 }
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44
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45 /* schedule the two ciphers */
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46 if ((err = cipher_descriptor[cipher].setup(key1, keylen, num_rounds, &xts->key1)) != CRYPT_OK) {
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47 return err;
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48 }
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49 if ((err = cipher_descriptor[cipher].setup(key2, keylen, num_rounds, &xts->key2)) != CRYPT_OK) {
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50 return err;
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51 }
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52 xts->cipher = cipher;
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53
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54 return err;
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55 }
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56
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57 #endif
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58
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59 /* ref: $Format:%D$ */
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60 /* git commit: $Format:%H$ */
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61 /* commit time: $Format:%ai$ */