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Ken Sumrall8f869aa2010-12-03 03:47:09 -08001/*
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.
Ken Sumralle8744072011-01-18 22:01:55 -080020 * 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.
Ken Sumrall8f869aa2010-12-03 03:47:09 -080024 * Obviously, the filesystem does not include the last 16 kbytes
25 * of the partition.
26 */
27
28#define CRYPT_FOOTER_OFFSET 0x4000
29
30#define MAX_CRYPTO_TYPE_NAME_LEN 64
31
Ken Sumralle8744072011-01-18 22:01:55 -080032#define SALT_LEN 16
33#define KEY_TO_SALT_PADDING 32
34
Ken Sumrall8f869aa2010-12-03 03:47:09 -080035/* definitions of flags in the structure below */
36#define CRYPT_MNT_KEY_UNENCRYPTED 0x1 /* The key for the partition is not encrypted. */
Ken Sumralld33d4172011-02-01 00:49:13 -080037#define CRYPT_ENCRYPTION_IN_PROGRESS 0x2 /* Set when starting encryption,
38 * clear when done before rebooting */
Ken Sumrall8f869aa2010-12-03 03:47:09 -080039
40#define CRYPT_MNT_MAGIC 0xD0B5B1C4
41
42#define __le32 unsigned int
43#define __le16 unsigned short int
44
45struct crypt_mnt_ftr {
46 __le32 magic; /* See above */
47 __le16 major_version;
48 __le16 minor_version;
49 __le32 ftr_size; /* in bytes, not including key following */
50 __le32 flags; /* See above */
51 __le32 keysize; /* in bytes */
52 __le32 spare1; /* ignored */
53 __le64 fs_size; /* Size of the encrypted fs, in 512 byte sectors */
54 __le32 failed_decrypt_count; /* count of # of failed attempts to decrypt and
55 mount, set to 0 on successful mount */
56 unsigned char crypto_type_name[MAX_CRYPTO_TYPE_NAME_LEN]; /* The type of encryption
57 needed to decrypt this
58 partition, null terminated */
59};
60
Ken Sumrall29d8da82011-05-18 17:20:07 -070061struct volume_info {
62 unsigned int size;
63 unsigned int flags;
64 struct crypt_mnt_ftr crypt_ftr;
65 char mnt_point[256];
66 char blk_dev[256];
67 char crypto_blkdev[256];
68 char label[256];
69};
70#define VOL_NONREMOVABLE 0x1
71#define VOL_ENCRYPTABLE 0x2
72
Ken Sumrall8f869aa2010-12-03 03:47:09 -080073#ifdef __cplusplus
74extern "C" {
75#endif
Ken Sumrall7f7dbaa2011-02-01 15:46:41 -080076 int cryptfs_crypto_complete(void);
Ken Sumrall8f869aa2010-12-03 03:47:09 -080077 int cryptfs_check_passwd(char *pw);
Ken Sumrall3ad90722011-10-04 20:38:29 -070078 int cryptfs_verify_passwd(char *newpw);
Ken Sumrall6864b7e2011-01-14 15:20:02 -080079 int cryptfs_restart(void);
Ken Sumrall8f869aa2010-12-03 03:47:09 -080080 int cryptfs_enable(char *flag, char *passwd);
Jason parks70a4b3f2011-01-28 10:10:47 -060081 int cryptfs_changepw(char *newpw);
Ken Sumrall29d8da82011-05-18 17:20:07 -070082 int cryptfs_setup_volume(const char *label, int major, int minor,
83 char *crypto_dev_path, unsigned int max_pathlen,
84 int *new_major, int *new_minor);
Ken Sumrall0b8b5972011-08-31 16:14:23 -070085 int cryptfs_revert_volume(const char *label);
Ken Sumrall8f869aa2010-12-03 03:47:09 -080086#ifdef __cplusplus
87}
88#endif
89