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) |
33 | extern "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 | |
45 | typedef 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 | |
55 | uint32_t |
56 | xts_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 | |
64 | int 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 | |
69 | int 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 | |
74 | void xts_done(symmetric_xts *xts); |
75 | |
76 | #if defined(__cplusplus) |
77 | } |
78 | #endif |
79 | |
80 | #endif |
81 | |