/* pgp.h

   PGP related functions.

   Copyright (C) 2001, 2002 Niels Möller

   This file is part of GNU Nettle.

   GNU Nettle is free software: you can redistribute it and/or
   modify it under the terms of either:

     * the GNU Lesser General Public License as published by the Free
       Software Foundation; either version 3 of the License, or (at your
       option) any later version.

   or

     * the GNU General Public License as published by the Free
       Software Foundation; either version 2 of the License, or (at your
       option) any later version.

   or both in parallel, as here.

   GNU Nettle 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 copies of the GNU General Public License and
   the GNU Lesser General Public License along with this program.  If
   not, see http://www.gnu.org/licenses/.
*/

#ifndef NETTLE_PGP_H_INCLUDED
#define NETTLE_PGP_H_INCLUDED

#include <time.h>

#include "nettle-types.h"
#include "bignum.h"

#ifdef __cplusplus
extern "C" {
#endif

/* Name mangling */
#define pgp_put_uint32 nettle_pgp_put_uint32
#define pgp_put_uint16 nettle_pgp_put_uint16
#define pgp_put_mpi nettle_pgp_put_mpi
#define pgp_put_string nettle_pgp_put_string
#define pgp_put_length nettle_pgp_put_length
#define pgp_put_header nettle_pgp_put_header
#define pgp_put_header_length nettle_pgp_put_header_length
#define pgp_sub_packet_start nettle_pgp_sub_packet_start
#define pgp_put_sub_packet nettle_pgp_put_sub_packet
#define pgp_sub_packet_end nettle_pgp_sub_packet_end
#define pgp_put_public_rsa_key nettle_pgp_put_public_rsa_key
#define pgp_put_rsa_sha1_signature nettle_pgp_put_rsa_sha1_signature
#define pgp_put_userid nettle_pgp_put_userid
#define pgp_crc24 nettle_pgp_crc24
#define pgp_armor nettle_pgp_armor

struct nettle_buffer;
struct rsa_public_key;
struct rsa_private_key;
struct sha1_ctx;

int
pgp_put_uint32(struct nettle_buffer *buffer, uint32_t i);

int
pgp_put_uint16(struct nettle_buffer *buffer, unsigned i);

int
pgp_put_mpi(struct nettle_buffer *buffer, const mpz_t x);

int
pgp_put_string(struct nettle_buffer *buffer,
	       unsigned length,
	       const uint8_t *s);

int
pgp_put_length(struct nettle_buffer *buffer,
	       unsigned length);

int
pgp_put_header(struct nettle_buffer *buffer,
	       unsigned tag, unsigned length);

void
pgp_put_header_length(struct nettle_buffer *buffer,
		      /* start of the header */
		      unsigned start,
		      unsigned field_size);

unsigned
pgp_sub_packet_start(struct nettle_buffer *buffer);

int
pgp_put_sub_packet(struct nettle_buffer *buffer,
		   unsigned type,
		   unsigned length,
		   const uint8_t *data);

void
pgp_sub_packet_end(struct nettle_buffer *buffer, unsigned start);

int
pgp_put_public_rsa_key(struct nettle_buffer *,
		       const struct rsa_public_key *key,
		       time_t timestamp);

int
pgp_put_rsa_sha1_signature(struct nettle_buffer *buffer,
			   const struct rsa_private_key *key,
			   const uint8_t *keyid,
			   unsigned type,
			   struct sha1_ctx *hash);

int
pgp_put_userid(struct nettle_buffer *buffer,
	       unsigned length,
	       const uint8_t *name);

uint32_t
pgp_crc24(unsigned length, const uint8_t *data);

int
pgp_armor(struct nettle_buffer *buffer,
	  const char *tag,
	  unsigned length,
	  const uint8_t *data);

/* Values that can be passed to pgp_put_header when the size of the
 * length field, but not the length itself, is known. Also the minimum length
 * for the given field size. */
enum pgp_lengths
  {
    PGP_LENGTH_ONE_OCTET = 0,
    PGP_LENGTH_TWO_OCTETS = 192,
    PGP_LENGTH_FOUR_OCTETS = 8384,
  };

enum pgp_public_key_algorithm
  {
    PGP_RSA = 1,
    PGP_RSA_ENCRYPT = 2,
    PGP_RSA_SIGN = 3,
    PGP_EL_GAMAL_ENCRYPT = 16,
    PGP_DSA = 17,
    PGP_EL_GAMAL = 20,
  };

enum pgp_symmetric_algorithm
  {
    PGP_PLAINTEXT = 0,
    PGP_IDEA = 1,
    PGP_3DES = 2,
    PGP_CAST5 = 3,
    PGP_BLOWFISH = 4,
    PGP_SAFER_SK = 5,
    PGP_AES128 = 7,
    PGP_AES192 = 8,
    PGP_AES256 = 9,
  };

enum pgp_compression_algorithm
  {
    PGP_UNCOMPRESSED = 0,
    PGP_ZIP = 1,
    PGP_ZLIB = 2,
  };

enum pgp_hash_algorithm
  {
    PGP_MD5 = 1,
    PGP_SHA1 = 2,
    PGP_RIPEMD = 3,
    PGP_MD2 = 5,
    PGP_TIGER192 = 6,
    PGP_HAVAL = 7,
  };

enum pgp_tag
  {
    PGP_TAG_PUBLIC_SESSION_KEY = 1,
    PGP_TAG_SIGNATURE = 2,
    PGP_TAG_SYMMETRIC_SESSION_KEY = 3,
    PGP_TAG_ONE_PASS_SIGNATURE = 4,
    PGP_TAG_SECRET_KEY = 5,
    PGP_TAG_PUBLIC_KEY = 6,
    PGP_TAG_SECRET_SUBKEY = 7,
    PGP_TAG_COMPRESSED = 8,
    PGP_TAG_ENCRYPTED = 9,
    PGP_TAG_MARKER = 10,
    PGP_TAG_LITERAL = 11,
    PGP_TAG_TRUST = 12,
    PGP_TAG_USERID = 13,
    PGP_TAG_PUBLIC_SUBKEY = 14,
  };

enum pgp_signature_type
  {
    PGP_SIGN_BINARY = 0,
    PGP_SIGN_TEXT = 1,
    PGP_SIGN_STANDALONE = 2,
    PGP_SIGN_CERTIFICATION = 0x10,
    PGP_SIGN_CERTIFICATION_PERSONA = 0x11,
    PGP_SIGN_CERTIFICATION_CASUAL = 0x12,
    PGP_SIGN_CERTIFICATION_POSITIVE = 0x13,
    PGP_SIGN_SUBKEY = 0x18,
    PGP_SIGN_KEY = 0x1f,
    PGP_SIGN_REVOCATION = 0x20,
    PGP_SIGN_REVOCATION_SUBKEY = 0x28,
    PGP_SIGN_REVOCATION_CERTIFICATE = 0x30,
    PGP_SIGN_TIMESTAMP = 0x40,
  };

enum pgp_subpacket_tag
  {
    PGP_SUBPACKET_CREATION_TIME = 2,
    PGP_SUBPACKET_SIGNATURE_EXPIRATION_TIME = 3,
    PGP_SUBPACKET_EXPORTABLE_CERTIFICATION = 4,
    PGP_SUBPACKET_TRUST_SIGNATURE = 5,
    PGP_SUBPACKET_REGULAR_EXPRESSION = 6,
    PGP_SUBPACKET_REVOCABLE = 7,
    PGP_SUBPACKET_KEY_EXPIRATION_TIME = 9,
    PGP_SUBPACKET_PLACEHOLDER = 10 ,
    PGP_SUBPACKET_PREFERRED_SYMMETRIC_ALGORITHMS = 11,
    PGP_SUBPACKET_REVOCATION_KEY = 12,
    PGP_SUBPACKET_ISSUER_KEY_ID = 16,
    PGP_SUBPACKET_NOTATION_DATA = 20,
    PGP_SUBPACKET_PREFERRED_HASH_ALGORITHMS = 21,
    PGP_SUBPACKET_PREFERRED_COMPRESSION_ALGORITHMS = 22,
    PGP_SUBPACKET_KEY_SERVER_PREFERENCES = 23,
    PGP_SUBPACKET_PREFERRED_KEY_SERVER = 24,
    PGP_SUBPACKET_PRIMARY_USER_ID = 25,
    PGP_SUBPACKET_POLICY_URL = 26,
    PGP_SUBPACKET_KEY_FLAGS = 27,
    PGP_SUBPACKET_SIGNERS_USER_ID = 28,
    PGP_SUBPACKET_REASON_FOR_REVOCATION = 29,
  };

#ifdef __cplusplus
}
#endif

#endif /* NETTLE_PGP_H_INCLUDED */