29d8da8cef
Add support for keeping the keys in a separate file on another partition, for devices with no space reserved for a footer after the userdata filesystem. Add support for encrypting the volumes managed by vold, if they meet certain criteria, namely being marked as nonremovable and encryptable in vold.fstab. A bit of trickiness is required to keep vold happy. Change-Id: Idf0611f74b56c1026c45742ca82e0c26e58828fe
87 lines
2.9 KiB
C
87 lines
2.9 KiB
C
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* This structure starts 16,384 bytes before the end of a hardware
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* partition that is encrypted.
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* Immediately following this structure is the encrypted key.
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* The keysize field tells how long the key is, in bytes.
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* Then there is 32 bytes of padding,
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* Finally there is the salt used with the user password.
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* The salt is fixed at 16 bytes long.
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* Obviously, the filesystem does not include the last 16 kbytes
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* of the partition.
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*/
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#define CRYPT_FOOTER_OFFSET 0x4000
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#define MAX_CRYPTO_TYPE_NAME_LEN 64
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#define SALT_LEN 16
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#define KEY_TO_SALT_PADDING 32
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/* definitions of flags in the structure below */
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#define CRYPT_MNT_KEY_UNENCRYPTED 0x1 /* The key for the partition is not encrypted. */
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#define CRYPT_ENCRYPTION_IN_PROGRESS 0x2 /* Set when starting encryption,
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* clear when done before rebooting */
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#define CRYPT_MNT_MAGIC 0xD0B5B1C4
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#define __le32 unsigned int
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#define __le16 unsigned short int
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struct crypt_mnt_ftr {
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__le32 magic; /* See above */
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__le16 major_version;
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__le16 minor_version;
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__le32 ftr_size; /* in bytes, not including key following */
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__le32 flags; /* See above */
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__le32 keysize; /* in bytes */
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__le32 spare1; /* ignored */
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__le64 fs_size; /* Size of the encrypted fs, in 512 byte sectors */
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__le32 failed_decrypt_count; /* count of # of failed attempts to decrypt and
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mount, set to 0 on successful mount */
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unsigned char crypto_type_name[MAX_CRYPTO_TYPE_NAME_LEN]; /* The type of encryption
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needed to decrypt this
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partition, null terminated */
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};
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struct volume_info {
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unsigned int size;
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unsigned int flags;
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struct crypt_mnt_ftr crypt_ftr;
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char mnt_point[256];
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char blk_dev[256];
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char crypto_blkdev[256];
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char label[256];
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};
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#define VOL_NONREMOVABLE 0x1
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#define VOL_ENCRYPTABLE 0x2
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#ifdef __cplusplus
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extern "C" {
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#endif
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int cryptfs_crypto_complete(void);
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int cryptfs_check_passwd(char *pw);
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int cryptfs_restart(void);
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int cryptfs_enable(char *flag, char *passwd);
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int cryptfs_changepw(char *newpw);
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int cryptfs_setup_volume(const char *label, int major, int minor,
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char *crypto_dev_path, unsigned int max_pathlen,
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int *new_major, int *new_minor);
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#ifdef __cplusplus
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}
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#endif
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