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+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* This structure starts 16,384 bytes before the end of a hardware
+ * partition that is encrypted.
+ * Immediately following this structure is the encrypted key.
+ * The keysize field tells how long the key is, in bytes.
+ * Then there is 32 bytes of padding,
+ * Finally there is the salt used with the user password.
+ * The salt is fixed at 16 bytes long.
+ * Obviously, the filesystem does not include the last 16 kbytes
+ * of the partition.
+ */
+
+#ifndef __CRYPTFS_H__
+#define __CRYPTFS_H__
+
+#ifdef TW_INCLUDE_CRYPTO_SAMSUNG
+#include "../libcrypt_samsung/include/libcrypt_samsung.h"
+#endif
+
+#define CRYPT_FOOTER_OFFSET 0x4000
+
+#define MAX_CRYPTO_TYPE_NAME_LEN 64
+
+#define SALT_LEN 16
+#define KEY_TO_SALT_PADDING 32
+
+/* definitions of flags in the structure below */
+#define CRYPT_MNT_KEY_UNENCRYPTED 0x1 /* The key for the partition is not encrypted. */
+#define CRYPT_ENCRYPTION_IN_PROGRESS 0x2 /* Set when starting encryption,
+ * clear when done before rebooting */
+
+#ifdef TW_INCLUDE_CRYPTO_SAMSUNG
+#define CRYPT_MNT_MAGIC_SAMSUNG 0xD0B5B1C5
+#endif
+#define CRYPT_MNT_MAGIC 0xD0B5B1C4
+
+#define __le32 unsigned int
+#define __le16 unsigned short int
+
+#pragma pack(1)
+
+struct crypt_mnt_ftr {
+ __le32 magic; /* See above */
+ __le16 major_version;
+ __le16 minor_version;
+ __le32 ftr_size; /* in bytes, not including key following */
+ __le32 flags; /* See above */
+ __le32 keysize; /* in bytes */
+ __le32 spare1; /* ignored */
+ __le64 fs_size; /* Size of the encrypted fs, in 512 byte sectors */
+ __le32 failed_decrypt_count; /* count of # of failed attempts to decrypt and
+ mount, set to 0 on successful mount */
+ char crypto_type_name[MAX_CRYPTO_TYPE_NAME_LEN]; /* The type of encryption
+ needed to decrypt this
+ partition, null terminated */
+};
+
+#pragma pack()
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+ int cryptfs_check_footer(void);
+ int cryptfs_check_passwd(const char *pw);
+#ifdef __cplusplus
+}
+#endif
+
+#endif // __CRYPTFS_H__
+