projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 6d2010ae A |
1 | /* |
| 2 | * Copyright (c) 2010 Apple Inc. All Rights Reserved. | |
| 3 | * | |
| 4 | * @APPLE_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. Please obtain a copy of the License at | |
| 10 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
| 11 | * file. | |
| 12 | * | |
| 13 | * The Original Code and all software distributed under the License are | |
| 14 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 15 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 16 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. | |
| 18 | * Please see the License for the specific language governing rights and | |
| 19 | * limitations under the License. | |
| 20 | * | |
| 21 | * @APPLE_LICENSE_HEADER_END@ | |
| 22 | */ | |
| 23 | ||
| 24 | /* | |
| 25 | * aesxts.h | |
| 26 | * | |
| 27 | * | |
| 28 | */ | |
| 29 | ||
| 30 | #include "stdint.h" | |
| 31 | ||
| 32 | ||
| 33 | #ifndef _AESXTS_H | |
| 34 | #define _AESXTS_H | |
| 35 | ||
| 36 | #if defined(__cplusplus) | |
| 37 | extern "C" | |
| 38 | { | |
| 39 | #endif | |
| 40 | ||
| 41 | /* | |
| 42 | * The context for XTS-AES | |
| 43 | */ | |
| 44 | ||
| 45 | ||
| 46 | #define KS_LENGTH 60 | |
| 47 | ||
| 48 | typedef struct { | |
| 49 | uint32_t ks[KS_LENGTH]; | |
| 50 | uint32_t rn; | |
| 51 | } aesedp_encrypt_ctx; | |
| 52 | ||
| 53 | typedef struct { | |
| 54 | uint32_t ks[KS_LENGTH]; | |
| 55 | uint32_t rn; | |
| 56 | } aesedp_decrypt_ctx; | |
| 57 | ||
| 58 | typedef struct { | |
| 59 | aesedp_decrypt_ctx decrypt; | |
| 60 | aesedp_encrypt_ctx encrypt; | |
| 61 | } aesedp_ctx; | |
| 62 | ||
| 63 | // xts mode context | |
| 64 | ||
| 65 | typedef struct { | |
| 66 | aesedp_ctx key1, key2; | |
| 67 | uint32_t cipher; // ignore - this is to fit with the library, but in this case we're only using aes | |
| 68 | } symmetric_xts; | |
| 69 | ||
| 70 | ||
| 71 | /* | |
| 72 | * These are the interfaces required for XTS-AES support | |
| 73 | */ | |
| 74 | ||
| 75 | uint32_t | |
| 76 | xts_start(uint32_t cipher, // ignored - we're doing this for xts-aes only | |
| 77 | const uint8_t *IV, // ignored | |
| 78 | const uint8_t *key1, int keylen, | |
| 79 | const uint8_t *key2, int tweaklen, // both keys are the same size for xts | |
| 80 | uint32_t num_rounds, // ignored | |
| 81 | uint32_t options, // ignored | |
| 82 | symmetric_xts *xts); | |
| 83 | ||
| 84 | int xts_encrypt( | |
| 85 | const uint8_t *pt, unsigned long ptlen, | |
| 86 | uint8_t *ct, | |
| 87 | const uint8_t *tweak, // this can be considered the sector IV for this use | |
| 88 | symmetric_xts *xts); | |
| 89 | ||
| 90 | int xts_decrypt( | |
| 91 | const uint8_t *ct, unsigned long ptlen, | |
| 92 | uint8_t *pt, | |
| 93 | const uint8_t *tweak, // this can be considered the sector IV for this use | |
| 94 | symmetric_xts *xts); | |
| 95 | ||
| 96 | ||
| 97 | void xts_done(symmetric_xts *xts); | |
| 98 | ||
| 99 | #if defined(__cplusplus) | |
| 100 | } | |
| 101 | #endif | |
| 102 | ||
| 103 | #endif /* _AESXTS_H */ |