/* crypto/asn1/d2i_s_pu.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * 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 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 acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS 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 AUTHOR OR 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.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

/* Origional version from Steven Schoch <schoch@sheba.arc.nasa.gov> */

#include <stdio.h>
#include "cryptlib.h"
#include "bn.h"
#include "dsa.h"
#include "objects.h"
#include "asn1_mac.h"

/*
 * ASN1err(ASN1_F_D2I_DSAPUBLICKEY,ERR_R_ASN1_LENGTH_MISMATCH);
 * ASN1err(ASN1_F_I2D_DSAPUBLICKEY,ASN1_R_UNKNOWN_ATTRIBUTE_TYPE);
 */

DSA *d2i_DSAPublicKey(DSA **a, unsigned char **pp, long length)
	{
	int i=ASN1_R_PARSING;
	ASN1_INTEGER *bs=NULL;
	M_ASN1_D2I_vars(a,DSA *,DSA_new);

	M_ASN1_D2I_Init();
	if ((length != 0) && ((M_ASN1_next & (~V_ASN1_CONSTRUCTED))
		== (V_ASN1_UNIVERSAL|(V_ASN1_INTEGER))))
		{
		c.slen=length;
		M_ASN1_D2I_get(bs,d2i_ASN1_INTEGER);
		if ((ret->pub_key=BN_bin2bn(bs->data,bs->length,ret->pub_key))
                        == NULL)
                        goto err_bn;
		ret->write_params=0;
		}
	else
		{
		M_ASN1_D2I_start_sequence();
		M_ASN1_D2I_get(bs,d2i_ASN1_INTEGER);
		if ((ret->pub_key=BN_bin2bn(bs->data,bs->length,ret->pub_key))
			== NULL)
			goto err_bn;
		M_ASN1_D2I_get(bs,d2i_ASN1_INTEGER);
		if ((ret->p=BN_bin2bn(bs->data,bs->length,ret->p)) == NULL)
			goto err_bn;
		M_ASN1_D2I_get(bs,d2i_ASN1_INTEGER);
		if ((ret->q=BN_bin2bn(bs->data,bs->length,ret->q)) == NULL)
			goto err_bn;
		M_ASN1_D2I_get(bs,d2i_ASN1_INTEGER);
		if ((ret->g=BN_bin2bn(bs->data,bs->length,ret->g)) == NULL)
			goto err_bn;

		ret->write_params=1;
		}

	ASN1_INTEGER_free(bs);
	bs=NULL;
	M_ASN1_D2I_Finish_2(a);
err_bn:
	i=ERR_R_BN_LIB;
err:
	ASN1err(ASN1_F_D2I_DSAPUBLICKEY,i);
	if ((ret != NULL) && ((a == NULL) || (*a != ret))) DSA_free(ret);
	if (bs != NULL) ASN1_INTEGER_free(bs);
	return(NULL);
	}