1/*
2 * Copyright (c) 2012 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28
29#ifndef _CRYPTO_AESXTS_H
30#define _CRYPTO_AESXTS_H
31
32#if defined(__cplusplus)
33extern "C"
34{
35#endif
36
37#include <corecrypto/ccmode.h>
38#include <corecrypto/ccaes.h>
39#include <corecrypto/ccn.h>
40
41//Unholy HACK: this works because we know the size of the context for every
42//possible corecrypto implementation is less than this.
43#define AES_XTS_CTX_MAX_SIZE (ccn_sizeof_size(3*sizeof(void *)) + 2*ccn_sizeof_size(128*4) + ccn_sizeof_size(16))
44
45typedef struct {
46 ccxts_ctx_decl(AES_XTS_CTX_MAX_SIZE, enc);
47 ccxts_ctx_decl(AES_XTS_CTX_MAX_SIZE, dec);
48} symmetric_xts;
49
50
51/*
52 * These are the interfaces required for XTS-AES support
53 */
54
55uint32_t
56xts_start(uint32_t cipher, // ignored - we're doing this for xts-aes only
57 const uint8_t *IV, // ignored
58 const uint8_t *key1, int keylen,
59 const uint8_t *key2, int tweaklen, // both keys are the same size for xts
60 uint32_t num_rounds, // ignored
61 uint32_t options, // ignored
62 symmetric_xts *xts);
63
64int xts_encrypt(const uint8_t *pt, unsigned long ptlen,
65 uint8_t *ct,
66 const uint8_t *tweak, // this can be considered the sector IV for this use
67 symmetric_xts *xts);
68
69int xts_decrypt(const uint8_t *ct, unsigned long ptlen,
70 uint8_t *pt,
71 const uint8_t *tweak, // this can be considered the sector IV for this use
72 symmetric_xts *xts);
73
74void xts_done(symmetric_xts *xts);
75
76#if defined(__cplusplus)
77}
78#endif
79
80#endif
81