/* x_bignum.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).

 *

 */

/*

 © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

 */

#include <stdio.h>

#include "cryptlib.h"

#include <openssl/asn1t.h>

#include <openssl/bn.h>

#if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__)))

#include "libcrypto_wsd_macros.h"

#include "libcrypto_wsd.h"

#endif

/* Custom primitive type for BIGNUM handling. This reads in an ASN1_INTEGER as a

 * BIGNUM directly. Currently it ignores the sign which isn't a problem since all

 * BIGNUMs used are non negative and anything that looks negative is normally due

 * to an encoding error.

 */

#define BN_SENSITIVE	1

static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it);

static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it);

static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it);

static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it);

#ifndef EMULATOR

static ASN1_PRIMITIVE_FUNCS bignum_pf = {

	NULL, 0,

	bn_new,

	bn_free,

	0,

	bn_c2i,

	bn_i2c

};

#else

static const ASN1_PRIMITIVE_FUNCS bignum_pf = {

	NULL, 0,

	bn_new,

	bn_free,

	0,

	bn_c2i,

	bn_i2c

};

#endif

ASN1_ITEM_start(BIGNUM)

	ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, 0, "BIGNUM"

ASN1_ITEM_end(BIGNUM)

ASN1_ITEM_start(CBIGNUM)

	ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, BN_SENSITIVE, "BIGNUM"

ASN1_ITEM_end(CBIGNUM)

static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it)

{

	*pval = (ASN1_VALUE *)BN_new();

	if(*pval) return 1;

	else return 0;

}

static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it)

{

	if(!*pval) return;

	if(it->size & BN_SENSITIVE) BN_clear_free((BIGNUM *)*pval);

	else BN_free((BIGNUM *)*pval);

	*pval = NULL;

}

static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it)

{

	BIGNUM *bn;

	int pad;

	if(!*pval) return -1;

	bn = (BIGNUM *)*pval;

	/* If MSB set in an octet we need a padding byte */

	if(BN_num_bits(bn) & 0x7) pad = 0;

	else pad = 1;

	if(cont) {

		if(pad) *cont++ = 0;

		BN_bn2bin(bn, cont);

	}

	return pad + BN_num_bytes(bn);

}

static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,

		  int utype, char *free_cont, const ASN1_ITEM *it)

{

	BIGNUM *bn;

	if(!*pval) bn_new(pval, it);

	bn  = (BIGNUM *)*pval;

	if(!BN_bin2bn(cont, len, bn)) {

		bn_free(pval, it);

		return 0;

	}

	return 1;

}