[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / ecryptfs.h

#ifndef _LINUX_ECRYPTFS_H
#define _LINUX_ECRYPTFS_H

/* Version verification for shared data structures w/ userspace */
#define ECRYPTFS_VERSION_MAJOR 0x00
#define ECRYPTFS_VERSION_MINOR 0x04
#define ECRYPTFS_SUPPORTED_FILE_VERSION 0x03
/* These flags indicate which features are supported by the kernel
 * module; userspace tools such as the mount helper read the feature
 * bits from a sysfs handle in order to determine how to behave. */
#define ECRYPTFS_VERSIONING_PASSPHRASE            0x00000001
#define ECRYPTFS_VERSIONING_PUBKEY                0x00000002
#define ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH 0x00000004
#define ECRYPTFS_VERSIONING_POLICY                0x00000008
#define ECRYPTFS_VERSIONING_XATTR                 0x00000010
#define ECRYPTFS_VERSIONING_MULTKEY               0x00000020
#define ECRYPTFS_VERSIONING_DEVMISC               0x00000040
#define ECRYPTFS_VERSIONING_HMAC                  0x00000080
#define ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION   0x00000100
#define ECRYPTFS_VERSIONING_GCM                   0x00000200
#define ECRYPTFS_MAX_PASSWORD_LENGTH 64
#define ECRYPTFS_MAX_PASSPHRASE_BYTES ECRYPTFS_MAX_PASSWORD_LENGTH
#define ECRYPTFS_SALT_SIZE 8
#define ECRYPTFS_SALT_SIZE_HEX (ECRYPTFS_SALT_SIZE*2)
/* The original signature size is only for what is stored on disk; all
 * in-memory representations are expanded hex, so it better adapted to
 * be passed around or referenced on the command line */
#define ECRYPTFS_SIG_SIZE 8
#define ECRYPTFS_SIG_SIZE_HEX (ECRYPTFS_SIG_SIZE*2)
#define ECRYPTFS_PASSWORD_SIG_SIZE ECRYPTFS_SIG_SIZE_HEX
#define ECRYPTFS_MAX_KEY_BYTES 64
#define ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES 512
#define ECRYPTFS_FILE_VERSION 0x03
#define ECRYPTFS_MAX_PKI_NAME_BYTES 16

#define RFC2440_CIPHER_DES3_EDE 0x02
#define RFC2440_CIPHER_CAST_5 0x03
#define RFC2440_CIPHER_BLOWFISH 0x04
#define RFC2440_CIPHER_AES_128 0x07
#define RFC2440_CIPHER_AES_192 0x08
#define RFC2440_CIPHER_AES_256 0x09
#define RFC2440_CIPHER_TWOFISH 0x0a
#define RFC2440_CIPHER_CAST_6 0x0b

#define RFC2440_CIPHER_RSA 0x01

/**
 * For convenience, we may need to pass around the encrypted session
 * key between kernel and userspace because the authentication token
 * may not be extractable.  For example, the TPM may not release the
 * private key, instead requiring the encrypted data and returning the
 * decrypted data.
 */
struct ecryptfs_session_key {
#define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_DECRYPT 0x00000001
#define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_ENCRYPT 0x00000002
#define ECRYPTFS_CONTAINS_DECRYPTED_KEY 0x00000004
#define ECRYPTFS_CONTAINS_ENCRYPTED_KEY 0x00000008
	u32 flags;
	u32 encrypted_key_size;
	u32 decrypted_key_size;
	u8 encrypted_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];
	u8 decrypted_key[ECRYPTFS_MAX_KEY_BYTES];
};

struct ecryptfs_password {
	u32 password_bytes;
	s32 hash_algo;
	u32 hash_iterations;
	u32 session_key_encryption_key_bytes;
#define ECRYPTFS_PERSISTENT_PASSWORD 0x01
#define ECRYPTFS_SESSION_KEY_ENCRYPTION_KEY_SET 0x02
	u32 flags;
	/* Iterated-hash concatenation of salt and passphrase */
	u8 session_key_encryption_key[ECRYPTFS_MAX_KEY_BYTES];
	u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1];
	/* Always in expanded hex */
	u8 salt[ECRYPTFS_SALT_SIZE];
};

enum ecryptfs_token_types {ECRYPTFS_PASSWORD, ECRYPTFS_PRIVATE_KEY};

struct ecryptfs_private_key {
	u32 key_size;
	u32 data_len;
	u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1];
	char pki_type[ECRYPTFS_MAX_PKI_NAME_BYTES + 1];
	u8 data[];
};

/* May be a password or a private key */
struct ecryptfs_auth_tok {
	u16 version; /* 8-bit major and 8-bit minor */
	u16 token_type;
#define ECRYPTFS_ENCRYPT_ONLY 0x00000001
	u32 flags;
	struct ecryptfs_session_key session_key;
	u8 reserved[32];
	union {
		struct ecryptfs_password password;
		struct ecryptfs_private_key private_key;
	} token;
} __attribute__ ((packed));

#endif /* _LINUX_ECRYPTFS_H */
Commit	Line	Data
f8f85271 RS	1	#ifndef _LINUX_ECRYPTFS_H
	2	#define _LINUX_ECRYPTFS_H
	3
	4	/* Version verification for shared data structures w/ userspace */
	5	#define ECRYPTFS_VERSION_MAJOR 0x00
	6	#define ECRYPTFS_VERSION_MINOR 0x04
	7	#define ECRYPTFS_SUPPORTED_FILE_VERSION 0x03
	8	/* These flags indicate which features are supported by the kernel
290502be KC	9	* module; userspace tools such as the mount helper read the feature
290502be KC	10	* bits from a sysfs handle in order to determine how to behave. */
f8f85271 RS	11	#define ECRYPTFS_VERSIONING_PASSPHRASE 0x00000001
	12	#define ECRYPTFS_VERSIONING_PUBKEY 0x00000002
	13	#define ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH 0x00000004
	14	#define ECRYPTFS_VERSIONING_POLICY 0x00000008
	15	#define ECRYPTFS_VERSIONING_XATTR 0x00000010
	16	#define ECRYPTFS_VERSIONING_MULTKEY 0x00000020
	17	#define ECRYPTFS_VERSIONING_DEVMISC 0x00000040
	18	#define ECRYPTFS_VERSIONING_HMAC 0x00000080
	19	#define ECRYPTFS_VERSIONING_FILENAME_ENCRYPTION 0x00000100
	20	#define ECRYPTFS_VERSIONING_GCM 0x00000200
f8f85271 RS	21	#define ECRYPTFS_MAX_PASSWORD_LENGTH 64
	22	#define ECRYPTFS_MAX_PASSPHRASE_BYTES ECRYPTFS_MAX_PASSWORD_LENGTH
	23	#define ECRYPTFS_SALT_SIZE 8
	24	#define ECRYPTFS_SALT_SIZE_HEX (ECRYPTFS_SALT_SIZE*2)
	25	/* The original signature size is only for what is stored on disk; all
	26	* in-memory representations are expanded hex, so it better adapted to
	27	* be passed around or referenced on the command line */
	28	#define ECRYPTFS_SIG_SIZE 8
	29	#define ECRYPTFS_SIG_SIZE_HEX (ECRYPTFS_SIG_SIZE*2)
	30	#define ECRYPTFS_PASSWORD_SIG_SIZE ECRYPTFS_SIG_SIZE_HEX
	31	#define ECRYPTFS_MAX_KEY_BYTES 64
	32	#define ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES 512
	33	#define ECRYPTFS_FILE_VERSION 0x03
	34	#define ECRYPTFS_MAX_PKI_NAME_BYTES 16
	35
	36	#define RFC2440_CIPHER_DES3_EDE 0x02
	37	#define RFC2440_CIPHER_CAST_5 0x03
	38	#define RFC2440_CIPHER_BLOWFISH 0x04
	39	#define RFC2440_CIPHER_AES_128 0x07
	40	#define RFC2440_CIPHER_AES_192 0x08
	41	#define RFC2440_CIPHER_AES_256 0x09
	42	#define RFC2440_CIPHER_TWOFISH 0x0a
	43	#define RFC2440_CIPHER_CAST_6 0x0b
	44
	45	#define RFC2440_CIPHER_RSA 0x01
	46
	47	/**
	48	* For convenience, we may need to pass around the encrypted session
	49	* key between kernel and userspace because the authentication token
	50	* may not be extractable. For example, the TPM may not release the
	51	* private key, instead requiring the encrypted data and returning the
	52	* decrypted data.
	53	*/
	54	struct ecryptfs_session_key {
	55	#define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_DECRYPT 0x00000001
	56	#define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_ENCRYPT 0x00000002
	57	#define ECRYPTFS_CONTAINS_DECRYPTED_KEY 0x00000004
	58	#define ECRYPTFS_CONTAINS_ENCRYPTED_KEY 0x00000008
	59	u32 flags;
	60	u32 encrypted_key_size;
	61	u32 decrypted_key_size;
	62	u8 encrypted_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];
	63	u8 decrypted_key[ECRYPTFS_MAX_KEY_BYTES];
	64	};
	65
	66	struct ecryptfs_password {
	67	u32 password_bytes;
	68	s32 hash_algo;
	69	u32 hash_iterations;
	70	u32 session_key_encryption_key_bytes;
	71	#define ECRYPTFS_PERSISTENT_PASSWORD 0x01
	72	#define ECRYPTFS_SESSION_KEY_ENCRYPTION_KEY_SET 0x02
	73	u32 flags;
	74	/* Iterated-hash concatenation of salt and passphrase */
	75	u8 session_key_encryption_key[ECRYPTFS_MAX_KEY_BYTES];
	76	u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1];
	77	/* Always in expanded hex */
	78	u8 salt[ECRYPTFS_SALT_SIZE];
	79	};
	80
	81	enum ecryptfs_token_types {ECRYPTFS_PASSWORD, ECRYPTFS_PRIVATE_KEY};
	82
	83	struct ecryptfs_private_key {
	84	u32 key_size;
85	u32 data_len;
86	u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1];
87	char pki_type[ECRYPTFS_MAX_PKI_NAME_BYTES + 1];
88	u8 data[];
89	};
90
91	/* May be a password or a private key */
92	struct ecryptfs_auth_tok {
93	u16 version; /* 8-bit major and 8-bit minor */
94	u16 token_type;
95	#define ECRYPTFS_ENCRYPT_ONLY 0x00000001
96	u32 flags;
97	struct ecryptfs_session_key session_key;
98	u8 reserved[32];
99	union {
100	struct ecryptfs_password password;
101	struct ecryptfs_private_key private_key;
102	} token;
103	} __attribute__ ((packed));
104
105	#endif /* _LINUX_ECRYPTFS_H */