58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
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/* SPDX-License-Identifier: Unlicense */
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#include "tomcrypt_private.h"
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wconversion"
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#pragma clang diagnostic ignored "-Wshorten-64-to-32"
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/**
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Source donated by Elliptic Semiconductor Inc (www.ellipticsemi.com) to the LibTom Projects
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*/
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#ifdef LTC_XTS_MODE
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/** Start XTS mode
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@param cipher The index of the cipher to use
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@param key1 The encrypt key
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@param key2 The tweak encrypt key
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@param keylen The length of the keys (each) in octets
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@param num_rounds The number of rounds for the cipher (0 == default)
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@param xts [out] XTS structure
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Returns CRYPT_OK upon success.
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*/
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int xts_start(int cipher, const unsigned char *key1, const unsigned char *key2, unsigned long keylen, int num_rounds,
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symmetric_xts *xts)
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{
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int err;
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/* check inputs */
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LTC_ARGCHK(key1 != NULL);
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LTC_ARGCHK(key2 != NULL);
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LTC_ARGCHK(xts != NULL);
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/* check if valid */
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if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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return err;
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}
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if (cipher_descriptor[cipher].block_length != 16) {
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return CRYPT_INVALID_ARG;
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}
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/* schedule the two ciphers */
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if ((err = ecb_start(cipher, key1, keylen, num_rounds, &xts->key1)) != CRYPT_OK) {
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return err;
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}
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if ((err = ecb_start(cipher, key2, keylen, num_rounds, &xts->key2)) != CRYPT_OK) {
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return err;
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}
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xts->cipher = cipher;
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return err;
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}
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#endif
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#pragma clang diagnostic pop
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