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/* rsa2openpgp.c
*
* Converting rsa keys to OpenPGP format.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2001, 2002 Niels Mller
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The nettle library 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#if WITH_PUBLIC_KEY
#include <string.h>
#include <time.h>
#include "rsa.h"
#include "buffer.h"
#include "pgp.h"
/* According to RFC 2440, a public key consists of the following packets:
*
* Public key packet
*
* Zero or more revocation signatures
*
* One or more User ID packets
*
* After each User ID packet, zero or more signature packets
*
* Zero or more Subkey packets
*
* After each Subkey packet, one signature packet, optionally a
* revocation.
*
* Currently, we generate a public key packet, a single user id, and a
* signature. */
int
rsa_keypair_to_openpgp(struct nettle_buffer *buffer,
const struct rsa_public_key *pub,
const struct rsa_private_key *priv,
/* A single user id. NUL-terminated utf8. */
const char *userid)
{
time_t now = time(NULL);
unsigned key_start;
unsigned key_length;
unsigned userid_start;
struct sha1_ctx key_hash;
struct sha1_ctx signature_hash;
uint8_t fingerprint[SHA1_DIGEST_SIZE];
key_start = buffer->size;
if (!pgp_put_public_rsa_key(buffer, pub, now))
return 0;
/* userid packet */
userid_start = buffer->size;
if (!pgp_put_userid(buffer, strlen(userid), userid))
return 0;
/* FIXME: We hash the key first, and then the user id. Is this right? */
sha1_init(&key_hash);
sha1_update(&key_hash,
userid_start - key_start,
buffer->contents + key_start);
signature_hash = key_hash;
sha1_digest(&key_hash, sizeof(fingerprint), fingerprint);
sha1_update(&signature_hash,
buffer->size - userid_start,
buffer->contents + userid_start);
return pgp_put_rsa_sha1_signature(buffer,
priv,
fingerprint + SHA1_DIGEST_SIZE - 8,
PGP_SIGN_CERTIFICATION,
&signature_hash);
}
#endif /* WITH_PUBLIC_KEY */
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