/* crypto/asn1/d2i_pr.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.]

 */

#include <stdio.h>

#include "cryptlib.h"

#include <openssl/bn.h>

#include <openssl/evp.h>

#include <openssl/objects.h>

#include <openssl/asn1.h>

#ifndef OPENSSL_NO_RSA

#include <openssl/rsa.h>

#endif

#ifndef OPENSSL_NO_DSA

#include <openssl/dsa.h>

#endif

#ifndef OPENSSL_NO_EC

#include <openssl/ec.h>

#endif

EXPORT_C EVP_PKEY *d2i_PrivateKey(int type, EVP_PKEY **a, const unsigned char **pp,

	     long length)

	{

	EVP_PKEY *ret;

	if ((a == NULL) || (*a == NULL))

		{

		if ((ret=EVP_PKEY_new()) == NULL)

			{

			ASN1err(ASN1_F_D2I_PRIVATEKEY,ERR_R_EVP_LIB);

			return(NULL);

			}

		}

	else	ret= *a;

	ret->save_type=type;

	ret->type=EVP_PKEY_type(type);

	switch (ret->type)

		{

#ifndef OPENSSL_NO_RSA

	case EVP_PKEY_RSA:

		if ((ret->pkey.rsa=d2i_RSAPrivateKey(NULL,

			(const unsigned char **)pp,length)) == NULL) /* TMP UGLY CAST */

			{

			ASN1err(ASN1_F_D2I_PRIVATEKEY,ERR_R_ASN1_LIB);

			goto err;

			}

		break;

#endif

#ifndef OPENSSL_NO_DSA

	case EVP_PKEY_DSA:

		if ((ret->pkey.dsa=d2i_DSAPrivateKey(NULL,

			(const unsigned char **)pp,length)) == NULL) /* TMP UGLY CAST */

			{

			ASN1err(ASN1_F_D2I_PRIVATEKEY,ERR_R_ASN1_LIB);

			goto err;

			}

		break;

#endif

#ifndef OPENSSL_NO_EC

	case EVP_PKEY_EC:

		if ((ret->pkey.ec = d2i_ECPrivateKey(NULL, 

			(const unsigned char **)pp, length)) == NULL)

			{

			ASN1err(ASN1_F_D2I_PRIVATEKEY, ERR_R_ASN1_LIB);

			goto err;

			}

		break;

#endif

	default:

		ASN1err(ASN1_F_D2I_PRIVATEKEY,ASN1_R_UNKNOWN_PUBLIC_KEY_TYPE);

		goto err;

		/* break; */

		}

	if (a != NULL) (*a)=ret;

	return(ret);

err:

	if ((ret != NULL) && ((a == NULL) || (*a != ret))) EVP_PKEY_free(ret);

	return(NULL);

	}

/* This works like d2i_PrivateKey() except it automatically works out the type */

EXPORT_C EVP_PKEY *d2i_AutoPrivateKey(EVP_PKEY **a, const unsigned char **pp,

	     long length)

{

	STACK_OF(ASN1_TYPE) *inkey;

	const unsigned char *p;

	int keytype;

	p = *pp;

	/* Dirty trick: read in the ASN1 data into a STACK_OF(ASN1_TYPE):

	 * by analyzing it we can determine the passed structure: this

	 * assumes the input is surrounded by an ASN1 SEQUENCE.

	 */

	inkey = d2i_ASN1_SET_OF_ASN1_TYPE(NULL, &p, length, d2i_ASN1_TYPE, 

			ASN1_TYPE_free, V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL);

	/* Since we only need to discern "traditional format" RSA and DSA

	 * keys we can just count the elements.

         */

	if(sk_ASN1_TYPE_num(inkey) == 6) 

		keytype = EVP_PKEY_DSA;

	else if (sk_ASN1_TYPE_num(inkey) == 4)

		keytype = EVP_PKEY_EC;

	else keytype = EVP_PKEY_RSA;

	sk_ASN1_TYPE_pop_free(inkey, ASN1_TYPE_free);

	return d2i_PrivateKey(keytype, a, pp, length);

}