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/* keyblob.h - Defs to describe a keyblob
* Copyright (C) 2009 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GnuPG is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef G13_KEYBLOB_H
#define G13_KEYBLOB_H
/* The header block is the actual core of G13. Here is the format:
u8 Packet type. Value is 61 (0x3d).
u8 Constant value 255 (0xff).
u32 Length of the following structure
b10 Value: "GnuPG/G13\x00".
u8 Version. Value is 1.
u8 reserved
u8 reserved
u8 OS Flag: reserved, should be 0.
u32 Length of the entire header. This includes all bytes
starting at the packet type and ending with the last
padding byte of the header.
u8 Number of copies of this header (1..255).
u8 Number of copies of this header at the end of the
container (usually 0).
b6 reserved
n bytes: OpenPGP encrypted and optionally signed message.
n bytes: CMS encrypted and optionally signed packet. Such a CMS
packet will be enclosed in a a private flagged OpenPGP
packet. Either the OpenPGP encrypted packet as described
above, the CMS encrypted or both packets must exist. The
encapsulation packet has this structure:
u8 Packet type. Value is 61 (0x3d).
u8 Constant value 255 (0xff).
u32 Length of the following structure
b10 Value: "GnuPG/CMS\x00".
b(n) Regular CMS structure.
n bytes: Padding. The structure resembles an OpenPGP packet.
u8 Packet type. Value is 61 (0x3d).
u8 Constant value 255 (0xff).
u32 Length of the following structure
b10 Value: "GnuPG/PAD\x00".
b(n) Padding stuff.
Given this structure the minimum padding is 16 bytes.
n bytes: File system container.
(optionally followed by copies on the header).
*/
#define KEYBLOB_TAG_BLOBVERSION 0
/* This tag is used to describe the version of the keyblob. It must
be the first tag in a keyblob and may only occur once. Its value
is a single byte giving the blob version. The only defined version
is 1. */
#define KEYBLOB_TAG_CONTTYPE 1
/* This tag gives the type of the container. The value is a two byte
big endian integer giving the type of the container as described by
the CONTTYPE_ constants. */
#define KEYBLOB_TAG_DETACHED 2
/* Indicates that the actual storage is not in the same file as the
keyblob. If a value is given it is expected to be the GUID of the
partition. */
#define KEYBLOB_TAG_KEYNO 16
/* This tag indicates a new key. The value is a 4 byte big endian
integer giving the key number. If the container type does only
need one key this key number should be 0. */
#define KEYBLOB_TAG_ENCALGO 17
/* Describes the algorithm of the key. It must follow a KEYNO tag.
The value is a 2 byte big endian algorithm number. The algorithm
numbers used are those from Libgcrypt (e.g. AES 128 is described by
the value 7). This tag is optional. */
#define KEYBLOB_TAG_ENCKEY 18
/* This tag gives the actual encryption key. It must follow a KEYNO
tag. The value is the plain key. */
#define KEYBLOB_TAG_MACALGO 19
/* Describes the MAC algorithm. It must follow a KEYNO tag. The
value is a 2 byte big endian algorithm number describing the MAC
algorithm with a value of 1 indicating HMAC. It is followed by
data specific to the MAC algorithm. In case of HMAC this data is a
2 byte big endian integer with the Libgcrypt algorithm id of the
hash algorithm. */
#define KEYBLOB_TAG_MACKEY 20
/* This tag gives the actual MACing key. It must follow a KEYNO tag.
The value is the key used for MACing. */
#define KEYBLOB_TAG_FILLER 0xffff
/* This tag may be used for alignment and padding porposes. The value
has no meaning. */
#define CONTTYPE_ENCFS 1
/* A EncFS based backend. This requires a whole directory which
includes the encrypted files. Metadata is not encrypted. */
#define CONTTYPE_TRUECRYPT 21571
/* A Truecrypt (www.truecrypt.org) based container. Due to the design
of truecrypt this requires a second datafile because it is not
possible to to prepend a truecrypt container with our keyblob. */
#endif /*G13_KEYBLOB_H*/
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