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124 lines
3.9 KiB
C
124 lines
3.9 KiB
C
/* xts.h
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XEX-based tweaked-codebook mode with ciphertext stealing (XTS)
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Copyright (C) 2005 Niels Möller
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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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#ifndef NETTLE_XTS_H_INCLUDED
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#define NETTLE_XTS_H_INCLUDED
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#include "nettle-types.h"
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#include "aes.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Name mangling */
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#define xts_encrypt_message nettle_xts_encrypt_message
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#define xts_decrypt_message nettle_xts_decrypt_message
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#define xts_aes128_set_encrypt_key nettle_xts_aes128_set_encrypt_key
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#define xts_aes128_set_decrypt_key nettle_xts_aes128_set_decrypt_key
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#define xts_aes128_encrypt_message nettle_xts_aes128_encrypt_message
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#define xts_aes128_decrypt_message nettle_xts_aes128_decrypt_message
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#define xts_aes256_set_encrypt_key nettle_xts_aes256_set_encrypt_key
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#define xts_aes256_set_decrypt_key nettle_xts_aes256_set_decrypt_key
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#define xts_aes256_encrypt_message nettle_xts_aes256_encrypt_message
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#define xts_aes256_decrypt_message nettle_xts_aes256_decrypt_message
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#define XTS_BLOCK_SIZE 16
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void
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xts_encrypt_message(const void *enc_ctx, const void *twk_ctx,
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nettle_cipher_func *encf,
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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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void
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xts_decrypt_message(const void *dec_ctx, const void *twk_ctx,
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nettle_cipher_func *decf, nettle_cipher_func *encf,
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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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/* XTS Mode with AES-128 */
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struct xts_aes128_key {
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struct aes128_ctx cipher;
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struct aes128_ctx tweak_cipher;
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};
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void
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xts_aes128_set_encrypt_key(struct xts_aes128_key *xts_key,
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const uint8_t *key);
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void
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xts_aes128_set_decrypt_key(struct xts_aes128_key *xts_key,
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const uint8_t *key);
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void
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xts_aes128_encrypt_message(const struct xts_aes128_key *xtskey,
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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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void
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xts_aes128_decrypt_message(const struct xts_aes128_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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/* XTS Mode with AES-256 */
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struct xts_aes256_key {
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struct aes256_ctx cipher;
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struct aes256_ctx tweak_cipher;
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};
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void
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xts_aes256_set_encrypt_key(struct xts_aes256_key *xts_key,
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const uint8_t *key);
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void
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xts_aes256_set_decrypt_key(struct xts_aes256_key *xts_key,
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const uint8_t *key);
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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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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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#ifdef __cplusplus
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}
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#endif
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#endif /* NETTLE_XTS_H_INCLUDED */
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