/* dsa_asn1.c */

/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL

 * project 2000.

 */

/* ====================================================================

 * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer. 

 *

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in

 *    the documentation and/or other materials provided with the

 *    distribution.

 *

 * 3. All advertising materials mentioning features or use of this

 *    software must display the following acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"

 *

 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

 *    endorse or promote products derived from this software without

 *    prior written permission. For written permission, please contact

 *    licensing@OpenSSL.org.

 *

 * 5. Products derived from this software may not be called "OpenSSL"

 *    nor may "OpenSSL" appear in their names without prior written

 *    permission of the OpenSSL Project.

 *

 * 6. Redistributions of any form whatsoever must retain the following

 *    acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"

 *

 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR

 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

 * OF THE POSSIBILITY OF SUCH DAMAGE.

 * ====================================================================

 *

 * This product includes cryptographic software written by Eric Young

 * (eay@cryptsoft.com).  This product includes software written by Tim

 * Hudson (tjh@cryptsoft.com).

 *

 */

#include <stdio.h>

#include "cryptlib.h"

#include <openssl/dsa.h>

#include <openssl/asn1.h>

#include <openssl/asn1t.h>

/* Override the default new methods */

static int sig_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it)

{

	if(operation == ASN1_OP_NEW_PRE) {

		DSA_SIG *sig;

		sig = OPENSSL_malloc(sizeof(DSA_SIG));

#ifdef SYMBIAN

  if(sig==NULL)

  {

  	DSAerr(DSA_F_SIG_CB, ERR_R_MALLOC_FAILURE);

  	return 0;

  }	

#endif		

		sig->r = NULL;

		sig->s = NULL;

		*pval = (ASN1_VALUE *)sig;

		if(sig) return 2;

		DSAerr(DSA_F_SIG_CB, ERR_R_MALLOC_FAILURE);

		return 0;

	}

	return 1;

}

ASN1_SEQUENCE_cb(DSA_SIG, sig_cb) = {

	ASN1_SIMPLE(DSA_SIG, r, CBIGNUM),

	ASN1_SIMPLE(DSA_SIG, s, CBIGNUM)

} ASN1_SEQUENCE_END_cb(DSA_SIG, DSA_SIG)

IMPLEMENT_ASN1_FUNCTIONS_const(DSA_SIG)

/* Override the default free and new methods */

static int dsa_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it)

{

	if(operation == ASN1_OP_NEW_PRE) {

		*pval = (ASN1_VALUE *)DSA_new();

		if(*pval) return 2;

		return 0;

	} else if(operation == ASN1_OP_FREE_PRE) {

		DSA_free((DSA *)*pval);

		*pval = NULL;

		return 2;

	}

	return 1;

}

ASN1_SEQUENCE_cb(DSAPrivateKey, dsa_cb) = {

	ASN1_SIMPLE(DSA, version, LONG),

	ASN1_SIMPLE(DSA, p, BIGNUM),

	ASN1_SIMPLE(DSA, q, BIGNUM),

	ASN1_SIMPLE(DSA, g, BIGNUM),

	ASN1_SIMPLE(DSA, pub_key, BIGNUM),

	ASN1_SIMPLE(DSA, priv_key, BIGNUM)

} ASN1_SEQUENCE_END_cb(DSA, DSAPrivateKey)

IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAPrivateKey, DSAPrivateKey)

ASN1_SEQUENCE_cb(DSAparams, dsa_cb) = {

	ASN1_SIMPLE(DSA, p, BIGNUM),

	ASN1_SIMPLE(DSA, q, BIGNUM),

	ASN1_SIMPLE(DSA, g, BIGNUM),

} ASN1_SEQUENCE_END_cb(DSA, DSAparams)

IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAparams, DSAparams)

/* DSA public key is a bit trickier... its effectively a CHOICE type

 * decided by a field called write_params which can either write out

 * just the public key as an INTEGER or the parameters and public key

 * in a SEQUENCE

 */

ASN1_SEQUENCE(dsa_pub_internal) = {

	ASN1_SIMPLE(DSA, pub_key, BIGNUM),

	ASN1_SIMPLE(DSA, p, BIGNUM),

	ASN1_SIMPLE(DSA, q, BIGNUM),

	ASN1_SIMPLE(DSA, g, BIGNUM)

} ASN1_SEQUENCE_END_name(DSA, dsa_pub_internal)

ASN1_CHOICE_cb(DSAPublicKey, dsa_cb) = {

	ASN1_SIMPLE(DSA, pub_key, BIGNUM),

	ASN1_EX_COMBINE(0, 0, dsa_pub_internal)

} ASN1_CHOICE_END_cb(DSA, DSAPublicKey, write_params)

IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAPublicKey, DSAPublicKey)