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163 lines
6.2 KiB
C
163 lines
6.2 KiB
C
/* keyblob.h - Defs to describe a keyblob
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* Copyright (C) 2009 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef G13_KEYBLOB_H
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#define G13_KEYBLOB_H
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/* The setup area (header block) is the actual core of G13. Here is
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the format:
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u8 Packet type. Value is 61 (0x3d).
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u8 Constant value 255 (0xff).
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u32 Length of the following structure
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b10 Value: "GnuPG/G13\x00".
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u8 Version. Value is 1.
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u8 reserved
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u8 reserved
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u8 OS Flag: 0 = unspecified, 1 = Linux
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u32 Length of the entire header. This includes all bytes
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starting at the packet type and ending with the last
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padding byte of the header.
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u8 Number of copies of this header (1..255).
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u8 Number of copies of this header at the end of the
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container (usually 0).
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b6 reserved
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n bytes: OpenPGP encrypted and optionally signed keyblob.
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n bytes: CMS encrypted and optionally signed keyblob. Such a CMS
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packet will be enclosed in a private flagged OpenPGP
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packet. Either the OpenPGP encrypted packet as described
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above, the CMS encrypted or both packets must exist. The
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encapsulation packet has this structure:
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u8 Packet type. Value is 61 (0x3d).
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u8 Constant value 255 (0xff).
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u32 Length of the following structure
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b10 Value: "GnuPG/CMS\x00".
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b(n) Regular CMS structure.
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n bytes: Padding. The structure resembles an OpenPGP packet.
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u8 Packet type. Value is 61 (0x3d).
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u8 Constant value 255 (0xff).
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u32 Length of the following structure
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b10 Value: "GnuPG/PAD\x00".
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b(n) Padding stuff.
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(repeat the above value
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or if the remaining N < 10, all 0x00).
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Given this structure the minimum padding is 16 bytes.
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n bytes: File system container.
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(optionally followed by copies on the header).
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*/
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#define KEYBLOB_TAG_BLOBVERSION 0
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/* This tag is used to describe the version of the keyblob. It must
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be the first tag in a keyblob and may only occur once. Its value
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is a single byte giving the blob version. The only defined version
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is 1. */
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#define KEYBLOB_TAG_CONTTYPE 1
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/* This tag gives the type of the container. The value is a two byte
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big endian integer giving the type of the container as described by
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the CONTTYPE_ constants. */
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#define KEYBLOB_TAG_DETACHED 2
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/* Indicates that the actual storage is not in the same file as the
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keyblob. If a value is given it is expected to be the GUID of the
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partition. */
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#define KEYBLOB_TAG_CREATED 3
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/* This is an ISO 8601 time string with the date the container was
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created. */
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#define KEYBLOB_TAG_CONT_NSEC 7
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/* Number of 512-byte sectors of the entire container including all
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copies of the setup area. */
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#define KEYBLOB_TAG_ENC_NSEC 8
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#define KEYBLOB_TAG_ENC_OFF 9
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/* Number of 512-byte sectors used for the encrypted data and its
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start offset in 512-byte sectors from the begin of the container.
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Note that these information can also be deduced from the
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unencrypted part of the setup area. */
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#define KEYBLOB_TAG_ALGOSTR 10
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/* For a dm-crypt container this is the used algorithm string. For
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example: "aes-cbc-essiv:sha256". */
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#define KEYBLOB_TAG_KEYNO 16
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/* This tag indicates a new key. The value is a 4 byte big endian
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integer giving the key number. If the container type does only
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need one key this key number should be 0. */
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#define KEYBLOB_TAG_ENCALGO 17
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/* Describes the algorithm of the key. It must follow a KEYNO tag.
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The value is a 2 byte big endian algorithm number. The algorithm
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numbers used are those from Libgcrypt (e.g. AES 128 is described by
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the value 7). This tag is optional. */
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#define KEYBLOB_TAG_ENCKEY 18
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/* This tag gives the actual encryption key. It must follow a KEYNO
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tag. The value is the plain key. */
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#define KEYBLOB_TAG_MACALGO 19
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/* Describes the MAC algorithm. It must follow a KEYNO tag. The
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value is a 2 byte big endian algorithm number describing the MAC
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algorithm with a value of 1 indicating HMAC. It is followed by
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data specific to the MAC algorithm. In case of HMAC this data is a
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2 byte big endian integer with the Libgcrypt algorithm id of the
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hash algorithm. */
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#define KEYBLOB_TAG_MACKEY 20
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/* This tag gives the actual MACing key. It must follow a KEYNO tag.
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The value is the key used for MACing. */
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#define KEYBLOB_TAG_HDRCOPY 21
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/* The value of this tag is a copy of the setup area prefix header
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block (packet 61 with marker "GnuPG/G13\x00". We use it to allow
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signing of that cleartext data. */
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#define KEYBLOB_TAG_FILLER 0xffff
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/* This tag may be used for alignment and padding purposes. The value
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has no meaning. */
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#define CONTTYPE_ENCFS 1
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/* A EncFS based backend. This requires a whole directory which
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includes the encrypted files. Metadata is not encrypted. */
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#define CONTTYPE_DM_CRYPT 2
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/* A DM-Crypt based backend. */
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#define CONTTYPE_TRUECRYPT 21571
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/* A Truecrypt (www.truecrypt.org) based container. Due to the design
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of truecrypt this requires a second datafile because it is not
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possible to prepend a truecrypt container with our keyblob. */
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/*-- keyblob.c --*/
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gpg_error_t g13_is_container (ctrl_t ctrl, const char *filename);
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gpg_error_t g13_keyblob_read (const char *filename,
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void **r_enckeyblob, size_t *r_enckeybloblen);
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#endif /*G13_KEYBLOB_H*/
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