bsd/crypto/aes/i386/aesxts.h

   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 */