/*
 * Copyright (C) 2003-2012 Free Software Foundation, Inc.
 *
 * Author: Nikos Mavrogiannopoulos
 *
 * This file is part of GnuTLS.
 *
 * The GnuTLS 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.
 *
 * This 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 this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */

/* Functions on OpenPGP privkey parsing
 */

#include <gnutls_int.h>
#include <gnutls_datum.h>
#include <gnutls_global.h>
#include <gnutls_errors.h>
#include <gnutls_num.h>
#include <openpgp_int.h>
#include <gnutls_openpgp.h>
#include <gnutls_sig.h>
#include <gnutls_pk.h>

/**
 * gnutls_openpgp_privkey_init:
 * @key: The structure to be initialized
 *
 * This function will initialize an OpenPGP key structure.
 *
 * Returns: %GNUTLS_E_SUCCESS on success, or an error code.
 **/
int gnutls_openpgp_privkey_init(gnutls_openpgp_privkey_t * key)
{
	*key = gnutls_calloc(1, sizeof(gnutls_openpgp_privkey_int));

	if (*key)
		return 0;	/* success */
	return GNUTLS_E_MEMORY_ERROR;
}

/**
 * gnutls_openpgp_privkey_deinit:
 * @key: The structure to be initialized
 *
 * This function will deinitialize a key structure.
 **/
void gnutls_openpgp_privkey_deinit(gnutls_openpgp_privkey_t key)
{
	if (!key)
		return;

	if (key->knode) {
		cdk_kbnode_release(key->knode);
		key->knode = NULL;
	}

	gnutls_free(key);
}

/*-
 * _gnutls_openpgp_privkey_cpy - This function copies a gnutls_openpgp_privkey_t structure
 * @dest: The structure where to copy
 * @src: The structure to be copied
 *
 * This function will copy an X.509 certificate structure.
 *
 * Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise a
 *   negative error value.
 -*/
int
_gnutls_openpgp_privkey_cpy(gnutls_openpgp_privkey_t dest,
			    gnutls_openpgp_privkey_t src)
{
	int ret;
	size_t raw_size = 0;
	uint8_t *der;
	gnutls_datum_t tmp;

	ret =
	    gnutls_openpgp_privkey_export(src, GNUTLS_OPENPGP_FMT_RAW,
					  NULL, 0, NULL, &raw_size);
	if (ret != GNUTLS_E_SHORT_MEMORY_BUFFER)
		return gnutls_assert_val(ret);

	der = gnutls_malloc(raw_size);
	if (der == NULL)
		return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);

	ret =
	    gnutls_openpgp_privkey_export(src, GNUTLS_OPENPGP_FMT_RAW,
					  NULL, 0, der, &raw_size);
	if (ret < 0) {
		gnutls_assert();
		gnutls_free(der);
		return ret;
	}

	tmp.data = der;
	tmp.size = raw_size;
	ret =
	    gnutls_openpgp_privkey_import(dest, &tmp,
					  GNUTLS_OPENPGP_FMT_RAW, NULL, 0);

	gnutls_free(der);

	if (ret < 0)
		return gnutls_assert_val(ret);

	memcpy(dest->preferred_keyid, src->preferred_keyid,
	       GNUTLS_OPENPGP_KEYID_SIZE);
	dest->preferred_set = src->preferred_set;

	return 0;
}

/**
 * gnutls_openpgp_privkey_sec_param:
 * @key: a key structure
 *
 * This function will return the security parameter appropriate with
 * this private key.
 *
 * Returns: On success, a valid security parameter is returned otherwise
 * %GNUTLS_SEC_PARAM_UNKNOWN is returned.
 *
 * Since: 2.12.0
 **/
gnutls_sec_param_t
gnutls_openpgp_privkey_sec_param(gnutls_openpgp_privkey_t key)
{
	gnutls_pk_algorithm_t algo;
	unsigned int bits;

	algo = gnutls_openpgp_privkey_get_pk_algorithm(key, &bits);
	if (algo == GNUTLS_PK_UNKNOWN) {
		gnutls_assert();
		return GNUTLS_SEC_PARAM_UNKNOWN;
	}

	return gnutls_pk_bits_to_sec_param(algo, bits);
}

/**
 * gnutls_openpgp_privkey_import:
 * @key: The structure to store the parsed key.
 * @data: The RAW or BASE64 encoded key.
 * @format: One of #gnutls_openpgp_crt_fmt_t elements.
 * @password: not used for now
 * @flags: should be (0)
 *
 * This function will convert the given RAW or Base64 encoded key to
 * the native gnutls_openpgp_privkey_t format.  The output will be
 * stored in 'key'.
 *
 * Returns: %GNUTLS_E_SUCCESS on success, or an error code.
 **/
int
gnutls_openpgp_privkey_import(gnutls_openpgp_privkey_t key,
			      const gnutls_datum_t * data,
			      gnutls_openpgp_crt_fmt_t format,
			      const char *password, unsigned int flags)
{
	cdk_packet_t pkt;
	int rc, armor;

	if (data->data == NULL || data->size == 0) {
		gnutls_assert();
		return GNUTLS_E_OPENPGP_GETKEY_FAILED;
	}

	if (format == GNUTLS_OPENPGP_FMT_RAW)
		armor = 0;
	else
		armor = 1;

	rc = cdk_kbnode_read_from_mem(&key->knode, armor, data->data,
				      data->size);
	if (rc != 0) {
		rc = _gnutls_map_cdk_rc(rc);
		gnutls_assert();
		return rc;
	}

	/* Test if the import was successful. */
	pkt = cdk_kbnode_find_packet(key->knode, CDK_PKT_SECRET_KEY);
	if (pkt == NULL) {
		gnutls_assert();
		return GNUTLS_E_OPENPGP_GETKEY_FAILED;
	}

	return 0;
}

/**
 * gnutls_openpgp_privkey_export:
 * @key: Holds the key.
 * @format: One of gnutls_openpgp_crt_fmt_t elements.
 * @password: the password that will be used to encrypt the key. (unused for now)
 * @flags: (0) for future compatibility
 * @output_data: will contain the key base64 encoded or raw
 * @output_data_size: holds the size of output_data (and will be
 *   replaced by the actual size of parameters)
 *
 * This function will convert the given key to RAW or Base64 format.
 * If the buffer provided is not long enough to hold the output, then
 * GNUTLS_E_SHORT_MEMORY_BUFFER will be returned.
 *
 * Returns: %GNUTLS_E_SUCCESS on success, or an error code.
 *
 * Since: 2.4.0
 **/
int
gnutls_openpgp_privkey_export(gnutls_openpgp_privkey_t key,
			      gnutls_openpgp_crt_fmt_t format,
			      const char *password, unsigned int flags,
			      void *output_data, size_t * output_data_size)
{
	/* FIXME for now we do not export encrypted keys */
	return _gnutls_openpgp_export(key->knode, format, output_data,
				      output_data_size, 1);
}

/**
 * gnutls_openpgp_privkey_export2:
 * @key: Holds the key.
 * @format: One of gnutls_openpgp_crt_fmt_t elements.
 * @password: the password that will be used to encrypt the key. (unused for now)
 * @flags: (0) for future compatibility
 * @out: will contain the raw or based64 encoded key
 *
 * This function will convert the given key to RAW or Base64 format.
 * The output buffer is allocated using gnutls_malloc().
 *
 * Returns: %GNUTLS_E_SUCCESS on success, or an error code.
 *
 * Since: 3.1.3
 **/
int
gnutls_openpgp_privkey_export2(gnutls_openpgp_privkey_t key,
			       gnutls_openpgp_crt_fmt_t format,
			       const char *password, unsigned int flags,
			       gnutls_datum_t * out)
{
	/* FIXME for now we do not export encrypted keys */
	return _gnutls_openpgp_export2(key->knode, format, out, 1);
}


/**
 * gnutls_openpgp_privkey_get_pk_algorithm:
 * @key: is an OpenPGP key
 * @bits: if bits is non null it will hold the size of the parameters' in bits
 *
 * This function will return the public key algorithm of an OpenPGP
 * certificate.
 *
 * If bits is non null, it should have enough size to hold the parameters
 * size in bits. For RSA the bits returned is the modulus.
 * For DSA the bits returned are of the public exponent.
 *
 * Returns: a member of the #gnutls_pk_algorithm_t enumeration on
 *   success, or a negative error code on error.
 *
 * Since: 2.4.0
 **/
gnutls_pk_algorithm_t
gnutls_openpgp_privkey_get_pk_algorithm(gnutls_openpgp_privkey_t key,
					unsigned int *bits)
{
	cdk_packet_t pkt;
	int algo = 0, ret;
	uint8_t keyid[GNUTLS_OPENPGP_KEYID_SIZE];

	if (!key) {
		gnutls_assert();
		return GNUTLS_PK_UNKNOWN;
	}

	ret = gnutls_openpgp_privkey_get_preferred_key_id(key, keyid);
	if (ret == 0) {
		int idx;

		idx = gnutls_openpgp_privkey_get_subkey_idx(key, keyid);
		if (idx != GNUTLS_OPENPGP_MASTER_KEYID_IDX) {
			algo =
			    gnutls_openpgp_privkey_get_subkey_pk_algorithm
			    (key, idx, bits);
			return algo;
		}
	}

	pkt = cdk_kbnode_find_packet(key->knode, CDK_PKT_SECRET_KEY);
	if (pkt) {
		if (bits)
			*bits = cdk_pk_get_nbits(pkt->pkt.secret_key->pk);
		algo =
		    _gnutls_openpgp_get_algo(pkt->pkt.secret_key->pk->
					     pubkey_algo);
	}

	return algo;
}

int _gnutls_openpgp_get_algo(int cdk_algo)
{
	int algo;

	if (is_RSA(cdk_algo))
		algo = GNUTLS_PK_RSA;
	else if (is_DSA(cdk_algo))
		algo = GNUTLS_PK_DSA;
	else {
		_gnutls_debug_log("Unknown OpenPGP algorithm %d\n",
				  cdk_algo);
		algo = GNUTLS_PK_UNKNOWN;
	}

	return algo;
}

/**
 * gnutls_openpgp_privkey_get_revoked_status:
 * @key: the structure that contains the OpenPGP private key.
 *
 * Get revocation status of key.
 *
 * Returns: true (1) if the key has been revoked, or false (0) if it
 *   has not, or a negative error code indicates an error.
 *
 * Since: 2.4.0
 **/
int gnutls_openpgp_privkey_get_revoked_status(gnutls_openpgp_privkey_t key)
{
	cdk_packet_t pkt;

	if (!key) {
		gnutls_assert();
		return GNUTLS_E_INVALID_REQUEST;
	}

	pkt = cdk_kbnode_find_packet(key->knode, CDK_PKT_SECRET_KEY);
	if (!pkt)
		return GNUTLS_E_OPENPGP_GETKEY_FAILED;

	if (pkt->pkt.secret_key->is_revoked != 0)
		return 1;
	return 0;
}

/**
 * gnutls_openpgp_privkey_get_fingerprint:
 * @key: the raw data that contains the OpenPGP secret key.
 * @fpr: the buffer to save the fingerprint, must hold at least 20 bytes.
 * @fprlen: the integer to save the length of the fingerprint.
 *
 * Get the fingerprint of the OpenPGP key. Depends on the
 * algorithm, the fingerprint can be 16 or 20 bytes.
 *
 * Returns: On success, 0 is returned, or an error code.
 *
 * Since: 2.4.0
 **/
int
gnutls_openpgp_privkey_get_fingerprint(gnutls_openpgp_privkey_t key,
				       void *fpr, size_t * fprlen)
{
	cdk_packet_t pkt;
	cdk_pkt_pubkey_t pk = NULL;

	if (!fpr || !fprlen) {
		gnutls_assert();
		return GNUTLS_E_INVALID_REQUEST;
	}

	*fprlen = 0;

	pkt = cdk_kbnode_find_packet(key->knode, CDK_PKT_SECRET_KEY);
	if (!pkt) {
		gnutls_assert();
		return GNUTLS_E_OPENPGP_GETKEY_FAILED;
	}

	pk = pkt->pkt.secret_key->pk;
	*fprlen = 20;

	if (is_RSA(pk->pubkey_algo) && pk->version < 4)
		*fprlen = 16;

	cdk_pk_get_fingerprint(pk, fpr);

	return 0;
}

/**
 * gnutls_openpgp_privkey_get_key_id:
 * @key: the structure that contains the OpenPGP secret key.
 * @keyid: the buffer to save the keyid.
 *
 * Get key-id.
 *
 * Returns: the 64-bit keyID of the OpenPGP key.
 *
 * Since: 2.4.0
 **/
int
gnutls_openpgp_privkey_get_key_id(gnutls_openpgp_privkey_t key,
				  gnutls_openpgp_keyid_t keyid)
{
	cdk_packet_t pkt;
	uint32_t kid[2];

	if (!key || !keyid) {
		gnutls_assert();
		return GNUTLS_E_INVALID_REQUEST;
	}

	pkt = cdk_kbnode_find_packet(key->knode, CDK_PKT_SECRET_KEY);
	if (!pkt)
		return GNUTLS_E_OPENPGP_GETKEY_FAILED;

	cdk_sk_get_keyid(pkt->pkt.secret_key, kid);
	_gnutls_write_uint32(kid[0], keyid);
	_gnutls_write_uint32(kid[1], keyid + 4);

	return 0;
}

/**
 * gnutls_openpgp_privkey_get_subkey_count:
 * @key: is an OpenPGP key
 *
 * This function will return the number of subkeys present in the
 * given OpenPGP certificate.
 *
 * Returns: the number of subkeys, or a negative error code on error.
 *
 * Since: 2.4.0
 **/
int gnutls_openpgp_privkey_get_subkey_count(gnutls_openpgp_privkey_t key)
{
	cdk_kbnode_t p, ctx;
	cdk_packet_t pkt;
	int subkeys;

	if (key == NULL) {
		gnutls_assert();
		return 0;
	}

	ctx = NULL;
	subkeys = 0;
	while ((p = cdk_kbnode_walk(key->knode, &ctx, 0))) {
		pkt = cdk_kbnode_get_packet(p);
		if (pkt->pkttype == CDK_PKT_SECRET_SUBKEY)
			subkeys++;
	}

	return subkeys;
}

/* returns the subkey with the given index */
static cdk_packet_t
_get_secret_subkey(gnutls_openpgp_privkey_t key, unsigned int indx)
{
	cdk_kbnode_t p, ctx;
	cdk_packet_t pkt;
	unsigned int subkeys;

	ctx = NULL;
	subkeys = 0;
	while ((p = cdk_kbnode_walk(key->knode, &ctx, 0))) {
		pkt = cdk_kbnode_get_packet(p);
		if (pkt->pkttype == CDK_PKT_SECRET_SUBKEY
		    && indx == subkeys++)
			return pkt;
	}

	return NULL;
}

/**
 * gnutls_openpgp_privkey_get_subkey_revoked_status:
 * @key: the structure that contains the OpenPGP private key.
 * @idx: is the subkey index
 *
 * Get revocation status of key.
 *
 * Returns: true (1) if the key has been revoked, or false (0) if it
 *   has not, or a negative error code indicates an error.
 *
 * Since: 2.4.0
 **/
int
gnutls_openpgp_privkey_get_subkey_revoked_status(gnutls_openpgp_privkey_t
						 key, unsigned int idx)
{
	cdk_packet_t pkt;

	if (!key) {
		gnutls_assert();
		return GNUTLS_E_INVALID_REQUEST;
	}

	if (idx == GNUTLS_OPENPGP_MASTER_KEYID_IDX)
		return gnutls_openpgp_privkey_get_revoked_status(key);

	pkt = _get_secret_subkey(key, idx);
	if (!pkt)
		return GNUTLS_E_OPENPGP_GETKEY_FAILED;

	if (pkt->pkt.secret_key->is_revoked != 0)
		return 1;
	return 0;
}

/**
 * gnutls_openpgp_privkey_get_subkey_pk_algorithm:
 * @key: is an OpenPGP key
 * @idx: is the subkey index
 * @bits: if bits is non null it will hold the size of the parameters' in bits
 *
 * This function will return the public key algorithm of a subkey of an OpenPGP
 * certificate.
 *
 * If bits is non null, it should have enough size to hold the parameters
 * size in bits. For RSA the bits returned is the modulus.
 * For DSA the bits returned are of the public exponent.
 *
 * Returns: a member of the #gnutls_pk_algorithm_t enumeration on
 *   success, or a negative error code on error.
 *
 * Since: 2.4.0
 **/
gnutls_pk_algorithm_t
gnutls_openpgp_privkey_get_subkey_pk_algorithm(gnutls_openpgp_privkey_t
					       key, unsigned int idx,
					       unsigned int *bits)
{
	cdk_packet_t pkt;
	int algo;

	if (!key) {
		gnutls_assert();
		return GNUTLS_PK_UNKNOWN;
	}

	if (idx == GNUTLS_OPENPGP_MASTER_KEYID_IDX)
		return gnutls_openpgp_privkey_get_pk_algorithm(key, bits);

	pkt = _get_secret_subkey(key, idx);

	algo = 0;
	if (pkt) {
		if (bits)
			*bits = cdk_pk_get_nbits(pkt->pkt.secret_key->pk);
		algo = pkt->pkt.secret_key->pubkey_algo;
		if (is_RSA(algo))
			algo = GNUTLS_PK_RSA;
		else if (is_DSA(algo))
			algo = GNUTLS_PK_DSA;
		else
			algo = GNUTLS_E_UNKNOWN_PK_ALGORITHM;
	}

	return algo;
}

/**
 * gnutls_openpgp_privkey_get_subkey_idx:
 * @key: the structure that contains the OpenPGP private key.
 * @keyid: the keyid.
 *
 * Get index of subkey.
 *
 * Returns: the index of the subkey or a negative error value.
 *
 * Since: 2.4.0
 **/
int
gnutls_openpgp_privkey_get_subkey_idx(gnutls_openpgp_privkey_t key,
				      const gnutls_openpgp_keyid_t keyid)
{
	int ret;
	uint32_t kid[2];
	uint8_t master_id[GNUTLS_OPENPGP_KEYID_SIZE];

	if (!key) {
		gnutls_assert();
		return GNUTLS_E_INVALID_REQUEST;
	}

	ret = gnutls_openpgp_privkey_get_key_id(key, master_id);
	if (ret < 0)
		return gnutls_assert_val(ret);
	if (memcmp(master_id, keyid, GNUTLS_OPENPGP_KEYID_SIZE) == 0)
		return GNUTLS_OPENPGP_MASTER_KEYID_IDX;

	KEYID_IMPORT(kid, keyid);
	ret = _gnutls_openpgp_find_subkey_idx(key->knode, kid, 1);

	if (ret < 0) {
		gnutls_assert();
	}

	return ret;
}

/**
 * gnutls_openpgp_privkey_get_subkey_creation_time:
 * @key: the structure that contains the OpenPGP private key.
 * @idx: the subkey index
 *
 * Get subkey creation time.
 *
 * Returns: the timestamp when the OpenPGP key was created.
 *
 * Since: 2.4.0
 **/
time_t
gnutls_openpgp_privkey_get_subkey_creation_time(gnutls_openpgp_privkey_t
						key, unsigned int idx)
{
	cdk_packet_t pkt;
	time_t timestamp;

	if (!key)
		return (time_t) - 1;

	if (idx == GNUTLS_OPENPGP_MASTER_KEYID_IDX)
		pkt =
		    cdk_kbnode_find_packet(key->knode, CDK_PKT_SECRET_KEY);
	else
		pkt = _get_secret_subkey(key, idx);

	if (pkt)
		timestamp = pkt->pkt.secret_key->pk->timestamp;
	else
		timestamp = 0;

	return timestamp;
}

/**
 * gnutls_openpgp_privkey_get_subkey_expiration_time:
 * @key: the structure that contains the OpenPGP private key.
 * @idx: the subkey index
 *
 * Get subkey expiration time.  A value of '0' means that the key
 * doesn't expire at all.
 *
 * Returns: the time when the OpenPGP key expires.
 *
 * Since: 2.4.0
 **/
time_t
gnutls_openpgp_privkey_get_subkey_expiration_time(gnutls_openpgp_privkey_t
						  key, unsigned int idx)
{
	cdk_packet_t pkt;
	time_t timestamp;

	if (!key)
		return (time_t) - 1;

	if (idx == GNUTLS_OPENPGP_MASTER_KEYID_IDX)
		pkt =
		    cdk_kbnode_find_packet(key->knode, CDK_PKT_SECRET_KEY);
	else
		pkt = _get_secret_subkey(key, idx);

	if (pkt)
		timestamp = pkt->pkt.secret_key->pk->expiredate;
	else
		timestamp = 0;

	return timestamp;
}

/**
 * gnutls_openpgp_privkey_get_subkey_id:
 * @key: the structure that contains the OpenPGP secret key.
 * @idx: the subkey index
 * @keyid: the buffer to save the keyid.
 *
 * Get the key-id for the subkey.
 *
 * Returns: the 64-bit keyID of the OpenPGP key.
 *
 * Since: 2.4.0
 **/
int
gnutls_openpgp_privkey_get_subkey_id(gnutls_openpgp_privkey_t key,
				     unsigned int idx,
				     gnutls_openpgp_keyid_t keyid)
{
	cdk_packet_t pkt;
	uint32_t kid[2];

	if (!key || !keyid) {
		gnutls_assert();
		return GNUTLS_E_INVALID_REQUEST;
	}

	if (idx == GNUTLS_OPENPGP_MASTER_KEYID_IDX)
		return gnutls_openpgp_privkey_get_key_id(key, keyid);

	pkt = _get_secret_subkey(key, idx);
	if (!pkt)
		return GNUTLS_E_OPENPGP_GETKEY_FAILED;

	cdk_sk_get_keyid(pkt->pkt.secret_key, kid);
	_gnutls_write_uint32(kid[0], keyid);
	_gnutls_write_uint32(kid[1], keyid + 4);

	return 0;
}

/**
 * gnutls_openpgp_privkey_get_subkey_fingerprint:
 * @key: the raw data that contains the OpenPGP secret key.
 * @idx: the subkey index
 * @fpr: the buffer to save the fingerprint, must hold at least 20 bytes.
 * @fprlen: the integer to save the length of the fingerprint.
 *
 * Get the fingerprint of an OpenPGP subkey.  Depends on the
 * algorithm, the fingerprint can be 16 or 20 bytes.
 *
 * Returns: On success, 0 is returned, or an error code.
 *
 * Since: 2.4.0
 **/
int
gnutls_openpgp_privkey_get_subkey_fingerprint(gnutls_openpgp_privkey_t key,
					      unsigned int idx,
					      void *fpr, size_t * fprlen)
{
	cdk_packet_t pkt;
	cdk_pkt_pubkey_t pk = NULL;

	if (!fpr || !fprlen) {
		gnutls_assert();
		return GNUTLS_E_INVALID_REQUEST;
	}

	if (idx == GNUTLS_OPENPGP_MASTER_KEYID_IDX)
		return gnutls_openpgp_privkey_get_fingerprint(key, fpr,
							      fprlen);

	*fprlen = 0;

	pkt = _get_secret_subkey(key, idx);
	if (!pkt)
		return GNUTLS_E_OPENPGP_GETKEY_FAILED;


	pk = pkt->pkt.secret_key->pk;
	*fprlen = 20;

	if (is_RSA(pk->pubkey_algo) && pk->version < 4)
		*fprlen = 16;

	cdk_pk_get_fingerprint(pk, fpr);

	return 0;
}

/* Extracts DSA and RSA parameters from a certificate.
 */
int
_gnutls_openpgp_privkey_get_mpis(gnutls_openpgp_privkey_t pkey,
				 uint32_t * keyid /*[2] */ ,
				 gnutls_pk_params_st * params)
{
	int result;
	unsigned int i, pk_algorithm;
	cdk_packet_t pkt;
	unsigned total;

	gnutls_pk_params_init(params);

	if (keyid == NULL)
		pkt =
		    cdk_kbnode_find_packet(pkey->knode,
					   CDK_PKT_SECRET_KEY);
	else
		pkt = _gnutls_openpgp_find_key(pkey->knode, keyid, 1);

	if (pkt == NULL) {
		gnutls_assert();
		return GNUTLS_E_OPENPGP_GETKEY_FAILED;
	}

	pk_algorithm =
	    _gnutls_openpgp_get_algo(pkt->pkt.secret_key->pk->pubkey_algo);

	switch (pk_algorithm) {
	case GNUTLS_PK_RSA:
		/* openpgp does not hold all parameters as in PKCS #1
		 */
		total = RSA_PRIVATE_PARAMS - 2;
		break;
	case GNUTLS_PK_DSA:
		total = DSA_PRIVATE_PARAMS;
		break;
	default:
		gnutls_assert();
		return GNUTLS_E_UNSUPPORTED_CERTIFICATE_TYPE;
	}

	for (i = 0; i < total; i++) {
		result =
		    _gnutls_read_pgp_mpi(pkt, 1, i, &params->params[i]);
		if (result < 0) {
			gnutls_assert();
			goto error;
		}
		params->params_nr++;
	}

	/* fixup will generate exp1 and exp2 that are not
	 * available here.
	 */
	result = _gnutls_pk_fixup(pk_algorithm, GNUTLS_IMPORT, params);
	if (result < 0) {
		gnutls_assert();
		goto error;
	}

	return 0;

      error:
	gnutls_pk_params_clear(params);
	gnutls_pk_params_release(params);

	return result;
}

/* The internal version of export
 */
static int
_get_sk_rsa_raw(gnutls_openpgp_privkey_t pkey,
		gnutls_openpgp_keyid_t keyid, gnutls_datum_t * m,
		gnutls_datum_t * e, gnutls_datum_t * d, gnutls_datum_t * p,
		gnutls_datum_t * q, gnutls_datum_t * u)
{
	int pk_algorithm, ret;
	cdk_packet_t pkt;
	uint32_t kid32[2];
	gnutls_pk_params_st params;

	if (pkey == NULL) {
		gnutls_assert();
		return GNUTLS_E_INVALID_REQUEST;
	}

	KEYID_IMPORT(kid32, keyid);

	pkt = _gnutls_openpgp_find_key(pkey->knode, kid32, 1);
	if (pkt == NULL) {
		gnutls_assert();
		return GNUTLS_E_OPENPGP_GETKEY_FAILED;
	}

	pk_algorithm =
	    _gnutls_openpgp_get_algo(pkt->pkt.secret_key->pk->pubkey_algo);

	if (pk_algorithm != GNUTLS_PK_RSA) {
		gnutls_assert();
		return GNUTLS_E_INVALID_REQUEST;
	}

	ret = _gnutls_openpgp_privkey_get_mpis(pkey, kid32, &params);
	if (ret < 0) {
		gnutls_assert();
		return ret;
	}

	ret = _gnutls_mpi_dprint(params.params[0], m);
	if (ret < 0) {
		gnutls_assert();
		goto cleanup;
	}

	ret = _gnutls_mpi_dprint(params.params[1], e);
	if (ret < 0) {
		gnutls_assert();
		_gnutls_free_datum(m);
		goto cleanup;
	}

	ret = _gnutls_mpi_dprint(params.params[2], d);
	if (ret < 0) {
		gnutls_assert();
		_gnutls_free_datum(m);
		_gnutls_free_datum(e);
		goto cleanup;
	}

	ret = _gnutls_mpi_dprint(params.params[3], p);
	if (ret < 0) {
		gnutls_assert();
		_gnutls_free_datum(m);
		_gnutls_free_datum(e);
		_gnutls_free_datum(d);
		goto cleanup;
	}

	ret = _gnutls_mpi_dprint(params.params[4], q);
	if (ret < 0) {
		gnutls_assert();
		_gnutls_free_datum(m);
		_gnutls_free_datum(e);
		_gnutls_free_datum(d);
		_gnutls_free_datum(p);
		goto cleanup;
	}

	ret = _gnutls_mpi_dprint(params.params[5], u);
	if (ret < 0) {
		gnutls_assert();
		_gnutls_free_datum(q);
		_gnutls_free_datum(m);
		_gnutls_free_datum(e);
		_gnutls_free_datum(d);
		_gnutls_free_datum(p);
		goto cleanup;
	}

	ret = 0;

      cleanup:
	gnutls_pk_params_clear(&params);
	gnutls_pk_params_release(&params);
	return ret;
}

static int
_get_sk_dsa_raw(gnutls_openpgp_privkey_t pkey,
		gnutls_openpgp_keyid_t keyid, gnutls_datum_t * p,
		gnutls_datum_t * q, gnutls_datum_t * g, gnutls_datum_t * y,
		gnutls_datum_t * x)
{
	int pk_algorithm, ret;
	cdk_packet_t pkt;
	uint32_t kid32[2];
	gnutls_pk_params_st params;

	if (pkey == NULL) {
		gnutls_assert();
		return GNUTLS_E_INVALID_REQUEST;
	}

	KEYID_IMPORT(kid32, keyid);

	pkt = _gnutls_openpgp_find_key(pkey->knode, kid32, 1);
	if (pkt == NULL) {
		gnutls_assert();
		return GNUTLS_E_OPENPGP_GETKEY_FAILED;
	}

	pk_algorithm =
	    _gnutls_openpgp_get_algo(pkt->pkt.secret_key->pk->pubkey_algo);

	if (pk_algorithm != GNUTLS_PK_DSA) {
		gnutls_assert();
		return GNUTLS_E_INVALID_REQUEST;
	}

	ret = _gnutls_openpgp_privkey_get_mpis(pkey, kid32, &params);
	if (ret < 0) {
		gnutls_assert();
		return ret;
	}

	/* P */
	ret = _gnutls_mpi_dprint(params.params[0], p);
	if (ret < 0) {
		gnutls_assert();
		goto cleanup;
	}

	/* Q */
	ret = _gnutls_mpi_dprint(params.params[1], q);
	if (ret < 0) {
		gnutls_assert();
		_gnutls_free_datum(p);
		goto cleanup;
	}


	/* G */
	ret = _gnutls_mpi_dprint(params.params[2], g);
	if (ret < 0) {
		gnutls_assert();
		_gnutls_free_datum(p);
		_gnutls_free_datum(q);
		goto cleanup;
	}


	/* Y */
	ret = _gnutls_mpi_dprint(params.params[3], y);
	if (ret < 0) {
		gnutls_assert();
		_gnutls_free_datum(p);
		_gnutls_free_datum(g);
		_gnutls_free_datum(q);
		goto cleanup;
	}

	ret = _gnutls_mpi_dprint(params.params[4], x);
	if (ret < 0) {
		gnutls_assert();
		_gnutls_free_datum(y);
		_gnutls_free_datum(p);
		_gnutls_free_datum(g);
		_gnutls_free_datum(q);
		goto cleanup;
	}

	ret = 0;

      cleanup:
	gnutls_pk_params_clear(&params);
	gnutls_pk_params_release(&params);
	return ret;
}


/**
 * gnutls_openpgp_privkey_export_rsa_raw:
 * @pkey: Holds the certificate
 * @m: will hold the modulus
 * @e: will hold the public exponent
 * @d: will hold the private exponent
 * @p: will hold the first prime (p)
 * @q: will hold the second prime (q)
 * @u: will hold the coefficient
 *
 * This function will export the RSA private key's parameters found in
 * the given structure.  The new parameters will be allocated using
 * gnutls_malloc() and will be stored in the appropriate datum.
 *
 * Returns: %GNUTLS_E_SUCCESS on success, otherwise a negative error code.
 *
 * Since: 2.4.0
 **/
int
gnutls_openpgp_privkey_export_rsa_raw(gnutls_openpgp_privkey_t pkey,
				      gnutls_datum_t * m,
				      gnutls_datum_t * e,
				      gnutls_datum_t * d,
				      gnutls_datum_t * p,
				      gnutls_datum_t * q,
				      gnutls_datum_t * u)
{
	uint8_t keyid[GNUTLS_OPENPGP_KEYID_SIZE];
	int ret;

	ret = gnutls_openpgp_privkey_get_key_id(pkey, keyid);
	if (ret < 0) {
		gnutls_assert();
		return ret;
	}

	return _get_sk_rsa_raw(pkey, keyid, m, e, d, p, q, u);
}

/**
 * gnutls_openpgp_privkey_export_dsa_raw:
 * @pkey: Holds the certificate
 * @p: will hold the p
 * @q: will hold the q
 * @g: will hold the g
 * @y: will hold the y
 * @x: will hold the x
 *
 * This function will export the DSA private key's parameters found in
 * the given certificate.  The new parameters will be allocated using
 * gnutls_malloc() and will be stored in the appropriate datum.
 *
 * Returns: %GNUTLS_E_SUCCESS on success, otherwise a negative error code.
 *
 * Since: 2.4.0
 **/
int
gnutls_openpgp_privkey_export_dsa_raw(gnutls_openpgp_privkey_t pkey,
				      gnutls_datum_t * p,
				      gnutls_datum_t * q,
				      gnutls_datum_t * g,
				      gnutls_datum_t * y,
				      gnutls_datum_t * x)
{
	uint8_t keyid[GNUTLS_OPENPGP_KEYID_SIZE];
	int ret;

	ret = gnutls_openpgp_privkey_get_key_id(pkey, keyid);
	if (ret < 0) {
		gnutls_assert();
		return ret;
	}

	return _get_sk_dsa_raw(pkey, keyid, p, q, g, y, x);
}

/**
 * gnutls_openpgp_privkey_export_subkey_rsa_raw:
 * @pkey: Holds the certificate
 * @idx: Is the subkey index
 * @m: will hold the modulus
 * @e: will hold the public exponent
 * @d: will hold the private exponent
 * @p: will hold the first prime (p)
 * @q: will hold the second prime (q)
 * @u: will hold the coefficient
 *
 * This function will export the RSA private key's parameters found in
 * the given structure.  The new parameters will be allocated using
 * gnutls_malloc() and will be stored in the appropriate datum.
 *
 * Returns: %GNUTLS_E_SUCCESS on success, otherwise a negative error code.
 *
 * Since: 2.4.0
 **/
int
gnutls_openpgp_privkey_export_subkey_rsa_raw(gnutls_openpgp_privkey_t pkey,
					     unsigned int idx,
					     gnutls_datum_t * m,
					     gnutls_datum_t * e,
					     gnutls_datum_t * d,
					     gnutls_datum_t * p,
					     gnutls_datum_t * q,
					     gnutls_datum_t * u)
{
	uint8_t keyid[GNUTLS_OPENPGP_KEYID_SIZE];
	int ret;

	if (idx == GNUTLS_OPENPGP_MASTER_KEYID_IDX)
		ret = gnutls_openpgp_privkey_get_key_id(pkey, keyid);
	else
		ret =
		    gnutls_openpgp_privkey_get_subkey_id(pkey, idx, keyid);
	if (ret < 0) {
		gnutls_assert();
		return ret;
	}

	return _get_sk_rsa_raw(pkey, keyid, m, e, d, p, q, u);
}

/**
 * gnutls_openpgp_privkey_export_subkey_dsa_raw:
 * @pkey: Holds the certificate
 * @idx: Is the subkey index
 * @p: will hold the p
 * @q: will hold the q
 * @g: will hold the g
 * @y: will hold the y
 * @x: will hold the x
 *
 * This function will export the DSA private key's parameters found
 * in the given certificate.  The new parameters will be allocated
 * using gnutls_malloc() and will be stored in the appropriate datum.
 *
 * Returns: %GNUTLS_E_SUCCESS on success, otherwise a negative error code.
 *
 * Since: 2.4.0
 **/
int
gnutls_openpgp_privkey_export_subkey_dsa_raw(gnutls_openpgp_privkey_t pkey,
					     unsigned int idx,
					     gnutls_datum_t * p,
					     gnutls_datum_t * q,
					     gnutls_datum_t * g,
					     gnutls_datum_t * y,
					     gnutls_datum_t * x)
{
	uint8_t keyid[GNUTLS_OPENPGP_KEYID_SIZE];
	int ret;

	if (idx == GNUTLS_OPENPGP_MASTER_KEYID_IDX)
		ret = gnutls_openpgp_privkey_get_key_id(pkey, keyid);
	else
		ret =
		    gnutls_openpgp_privkey_get_subkey_id(pkey, idx, keyid);

	if (ret < 0) {
		gnutls_assert();
		return ret;
	}

	return _get_sk_dsa_raw(pkey, keyid, p, q, g, y, x);
}

/**
 * gnutls_openpgp_privkey_get_preferred_key_id:
 * @key: the structure that contains the OpenPGP public key.
 * @keyid: the struct to save the keyid.
 *
 * Get the preferred key-id for the key.
 *
 * Returns: the 64-bit preferred keyID of the OpenPGP key, or if it
 *   hasn't been set it returns %GNUTLS_E_INVALID_REQUEST.
 **/
int
gnutls_openpgp_privkey_get_preferred_key_id(gnutls_openpgp_privkey_t key,
					    gnutls_openpgp_keyid_t keyid)
{
	if (!key || !keyid) {
		gnutls_assert();
		return GNUTLS_E_INVALID_REQUEST;
	}

	if (!key->preferred_set)
		return
		    gnutls_assert_val
		    (GNUTLS_E_OPENPGP_PREFERRED_KEY_ERROR);

	memcpy(keyid, key->preferred_keyid, GNUTLS_OPENPGP_KEYID_SIZE);

	return 0;
}

/**
 * gnutls_openpgp_privkey_set_preferred_key_id:
 * @key: the structure that contains the OpenPGP public key.
 * @keyid: the selected keyid
 *
 * This allows setting a preferred key id for the given certificate.
 * This key will be used by functions that involve key handling.
 *
 * If the provided @keyid is %NULL then the master key is
 * set as preferred.
 *
 * Returns: On success, %GNUTLS_E_SUCCESS (0) is returned,
 *   otherwise a negative error code is returned.
 **/
int
gnutls_openpgp_privkey_set_preferred_key_id(gnutls_openpgp_privkey_t key,
					    const gnutls_openpgp_keyid_t
					    keyid)
{
	int ret;

	if (!key) {
		gnutls_assert();
		return GNUTLS_E_INVALID_REQUEST;
	}

	if (keyid == NULL) {	/* set the master as preferred */
		uint8_t tmp[GNUTLS_OPENPGP_KEYID_SIZE];

		ret = gnutls_openpgp_privkey_get_key_id(key, tmp);
		if (ret < 0)
			return gnutls_assert_val(ret);

		key->preferred_set = 1;
		memcpy(key->preferred_keyid, tmp,
		       GNUTLS_OPENPGP_KEYID_SIZE);

		return 0;
	}

	/* check if the id is valid */
	ret = gnutls_openpgp_privkey_get_subkey_idx(key, keyid);
	if (ret < 0) {
		_gnutls_debug_log("the requested subkey does not exist\n");
		gnutls_assert();
		return ret;
	}

	key->preferred_set = 1;
	memcpy(key->preferred_keyid, keyid, GNUTLS_OPENPGP_KEYID_SIZE);

	return 0;
}

/**
 * gnutls_openpgp_privkey_sign_hash:
 * @key: Holds the key
 * @hash: holds the data to be signed
 * @signature: will contain newly allocated signature
 *
 * This function will sign the given hash using the private key.  You
 * should use gnutls_openpgp_privkey_set_preferred_key_id() before
 * calling this function to set the subkey to use.
 *
 * Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise a
 *   negative error value.
 *
 * Deprecated: Use gnutls_privkey_sign_hash() instead.
 */
int
gnutls_openpgp_privkey_sign_hash(gnutls_openpgp_privkey_t key,
				 const gnutls_datum_t * hash,
				 gnutls_datum_t * signature)
{
	int result;
	gnutls_pk_params_st params;
	int pk_algorithm;
	uint8_t keyid[GNUTLS_OPENPGP_KEYID_SIZE];
	char buf[2 * GNUTLS_OPENPGP_KEYID_SIZE + 1];

	if (key == NULL) {
		gnutls_assert();
		return GNUTLS_E_INVALID_REQUEST;
	}

	result = gnutls_openpgp_privkey_get_preferred_key_id(key, keyid);
	if (result == 0) {
		uint32_t kid[2];
		int idx;

		KEYID_IMPORT(kid, keyid);

		_gnutls_hard_log("Signing using PGP key ID %s\n",
				 _gnutls_bin2hex(keyid,
						 GNUTLS_OPENPGP_KEYID_SIZE,
						 buf, sizeof(buf), NULL));

		idx = gnutls_openpgp_privkey_get_subkey_idx(key, keyid);
		pk_algorithm =
		    gnutls_openpgp_privkey_get_subkey_pk_algorithm(key,
								   idx,
								   NULL);
		result =
		    _gnutls_openpgp_privkey_get_mpis(key, kid, &params);
	} else {
		_gnutls_hard_log("Signing using master PGP key\n");

		pk_algorithm =
		    gnutls_openpgp_privkey_get_pk_algorithm(key, NULL);
		result =
		    _gnutls_openpgp_privkey_get_mpis(key, NULL, &params);
	}

	if (result < 0) {
		gnutls_assert();
		return result;
	}


	result = _gnutls_pk_sign(pk_algorithm, signature, hash, &params);

	gnutls_pk_params_clear(&params);
	gnutls_pk_params_release(&params);

	if (result < 0) {
		gnutls_assert();
		return result;
	}

	return 0;
}

/*-
 * _gnutls_openpgp_privkey_decrypt_data:
 * @key: Holds the key
 * @flags: (0) for now
 * @ciphertext: holds the data to be decrypted
 * @plaintext: will contain newly allocated plaintext
 *
 * This function will sign the given hash using the private key.  You
 * should use gnutls_openpgp_privkey_set_preferred_key_id() before
 * calling this function to set the subkey to use.
 *
 * Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise a
 *   negative error value.
 -*/
int
_gnutls_openpgp_privkey_decrypt_data(gnutls_openpgp_privkey_t key,
				     unsigned int flags,
				     const gnutls_datum_t * ciphertext,
				     gnutls_datum_t * plaintext)
{
	int result, i;
	gnutls_pk_params_st params;
	int pk_algorithm;
	uint8_t keyid[GNUTLS_OPENPGP_KEYID_SIZE];
	char buf[2 * GNUTLS_OPENPGP_KEYID_SIZE + 1];

	if (key == NULL) {
		gnutls_assert();
		return GNUTLS_E_INVALID_REQUEST;
	}

	result = gnutls_openpgp_privkey_get_preferred_key_id(key, keyid);
	if (result == 0) {
		uint32_t kid[2];

		KEYID_IMPORT(kid, keyid);

		_gnutls_hard_log("Decrypting using PGP key ID %s\n",
				 _gnutls_bin2hex(keyid,
						 GNUTLS_OPENPGP_KEYID_SIZE,
						 buf, sizeof(buf), NULL));

		result =
		    _gnutls_openpgp_privkey_get_mpis(key, kid, &params);

		i = gnutls_openpgp_privkey_get_subkey_idx(key, keyid);

		pk_algorithm =
		    gnutls_openpgp_privkey_get_subkey_pk_algorithm(key, i,
								   NULL);
	} else {
		_gnutls_hard_log("Decrypting using master PGP key\n");

		pk_algorithm =
		    gnutls_openpgp_privkey_get_pk_algorithm(key, NULL);

		result =
		    _gnutls_openpgp_privkey_get_mpis(key, NULL, &params);

	}

	if (result < 0) {
		gnutls_assert();
		return result;
	}

	result =
	    _gnutls_pk_decrypt(pk_algorithm, plaintext, ciphertext,
			       &params);

	gnutls_pk_params_clear(&params);
	gnutls_pk_params_release(&params);

	if (result < 0)
		return gnutls_assert_val(result);

	return 0;
}
