/* 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;

 }