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78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
/* xts-aes256.c
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XTS Mode using AES256 as the underlying cipher.
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Copyright (C) 2018 Red Hat, Inc.
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This file is part of GNU Nettle.
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GNU Nettle is free software: you can redistribute it and/or
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modify it under the terms of either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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or both in parallel, as here.
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GNU Nettle is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see http://www.gnu.org/licenses/.
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*/
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#if HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <assert.h>
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#include "aes.h"
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#include "xts.h"
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void
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xts_aes256_set_encrypt_key(struct xts_aes256_key *xts_key, const uint8_t *key)
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{
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aes256_set_encrypt_key(&xts_key->cipher, key);
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aes256_set_encrypt_key(&xts_key->tweak_cipher, &key[AES256_KEY_SIZE]);
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}
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void
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xts_aes256_set_decrypt_key(struct xts_aes256_key *xts_key, const uint8_t *key)
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{
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aes256_set_decrypt_key(&xts_key->cipher, key);
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aes256_set_encrypt_key(&xts_key->tweak_cipher, &key[AES256_KEY_SIZE]);
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}
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void
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xts_aes256_encrypt_message(const struct xts_aes256_key *xts_key,
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const uint8_t *tweak, size_t length,
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uint8_t *dst, const uint8_t *src)
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{
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xts_encrypt_message(&xts_key->cipher, &xts_key->tweak_cipher,
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(nettle_cipher_func *) aes256_encrypt,
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tweak, length, dst, src);
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}
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void
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xts_aes256_decrypt_message(const struct xts_aes256_key *xts_key,
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const uint8_t *tweak, size_t length,
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uint8_t *dst, const uint8_t *src)
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{
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xts_decrypt_message(&xts_key->cipher, &xts_key->tweak_cipher,
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(nettle_cipher_func *) aes256_decrypt,
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(nettle_cipher_func *) aes256_encrypt,
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tweak, length, dst, src);
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}
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