diff --git a/cryptfs.h b/cryptfs.h
new file mode 100644
index 0000000..32f1724
--- /dev/null
+++ b/cryptfs.h
@@ -0,0 +1,60 @@
+/*
+ * 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.
+ * Obviously, the filesystem does not include the last 16 kbytes
+ * of the partition.
+ */
+
+#define CRYPT_FOOTER_OFFSET 0x4000
+
+#define MAX_CRYPTO_TYPE_NAME_LEN 64
+
+/* definitions of flags in the structure below */
+#define CRYPT_MNT_KEY_UNENCRYPTED 0x1 /* The key for the partition is not encrypted. */
+
+#define CRYPT_MNT_MAGIC 0xD0B5B1C4
+
+#define __le32 unsigned int
+#define __le16 unsigned short int 
+
+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 */
+  unsigned char crypto_type_name[MAX_CRYPTO_TYPE_NAME_LEN]; /* The type of encryption
+							       needed to decrypt this
+							       partition, null terminated */
+};
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+  int cryptfs_check_passwd(char *pw);
+  int cryptfs_enable(char *flag, char *passwd);
+#ifdef __cplusplus
+}
+#endif
+