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Dees_Troy51a0e822012-09-05 15:24:24 -04001/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17/* This structure starts 16,384 bytes before the end of a hardware
18 * partition that is encrypted.
19 * Immediately following this structure is the encrypted key.
20 * The keysize field tells how long the key is, in bytes.
21 * Then there is 32 bytes of padding,
22 * Finally there is the salt used with the user password.
23 * The salt is fixed at 16 bytes long.
24 * Obviously, the filesystem does not include the last 16 kbytes
25 * of the partition.
26 */
27
a39552696ff55ce2013-01-08 16:14:56 +000028#ifndef __CRYPTFS_H__
29#define __CRYPTFS_H__
30
31#ifdef TW_INCLUDE_CRYPTO_SAMSUNG
32#include "../libcrypt_samsung/include/libcrypt_samsung.h"
33#endif
34
Dees_Troy51a0e822012-09-05 15:24:24 -040035#define CRYPT_FOOTER_OFFSET 0x4000
36
37#define MAX_CRYPTO_TYPE_NAME_LEN 64
38
39#define SALT_LEN 16
40#define KEY_TO_SALT_PADDING 32
41
42/* definitions of flags in the structure below */
43#define CRYPT_MNT_KEY_UNENCRYPTED 0x1 /* The key for the partition is not encrypted. */
44#define CRYPT_ENCRYPTION_IN_PROGRESS 0x2 /* Set when starting encryption,
45 * clear when done before rebooting */
46
a39552696ff55ce2013-01-08 16:14:56 +000047#ifdef TW_INCLUDE_CRYPTO_SAMSUNG
48#define CRYPT_MNT_MAGIC_SAMSUNG 0xD0B5B1C5
49#endif
Dees_Troy51a0e822012-09-05 15:24:24 -040050#define CRYPT_MNT_MAGIC 0xD0B5B1C4
51
52#define __le32 unsigned int
53#define __le16 unsigned short int
54
a39552696ff55ce2013-01-08 16:14:56 +000055#pragma pack(1)
56
Dees_Troy51a0e822012-09-05 15:24:24 -040057struct crypt_mnt_ftr {
58 __le32 magic; /* See above */
59 __le16 major_version;
60 __le16 minor_version;
61 __le32 ftr_size; /* in bytes, not including key following */
62 __le32 flags; /* See above */
63 __le32 keysize; /* in bytes */
64 __le32 spare1; /* ignored */
65 __le64 fs_size; /* Size of the encrypted fs, in 512 byte sectors */
66 __le32 failed_decrypt_count; /* count of # of failed attempts to decrypt and
67 mount, set to 0 on successful mount */
a39552696ff55ce2013-01-08 16:14:56 +000068 char crypto_type_name[MAX_CRYPTO_TYPE_NAME_LEN]; /* The type of encryption
Dees_Troy51a0e822012-09-05 15:24:24 -040069 needed to decrypt this
70 partition, null terminated */
71};
72
a39552696ff55ce2013-01-08 16:14:56 +000073#pragma pack()
74
Dees_Troy51a0e822012-09-05 15:24:24 -040075
76#ifdef __cplusplus
77extern "C" {
78#endif
a39552696ff55ce2013-01-08 16:14:56 +000079 int cryptfs_check_passwd(const char *pw);
Dees_Troy51a0e822012-09-05 15:24:24 -040080#ifdef __cplusplus
81}
82#endif
83
a39552696ff55ce2013-01-08 16:14:56 +000084#endif // __CRYPTFS_H__
85