/* crypto/asn1/a_enum.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/asn1.h>

#include <openssl/bn.h>

/* 

 * Code for ENUMERATED type: identical to INTEGER apart from a different tag.

 * for comments on encoding see a_int.c

 */

EXPORT_C int ASN1_ENUMERATED_set(ASN1_ENUMERATED *a, long v)

	{

	int j,k;

	unsigned int i;

	unsigned char buf[sizeof(long)+1];

	long d;

	a->type=V_ASN1_ENUMERATED;

	if (a->length < (int)(sizeof(long)+1))

		{

		if (a->data != NULL)

			OPENSSL_free(a->data);

		if ((a->data=(unsigned char *)OPENSSL_malloc(sizeof(long)+1)) != NULL)

			memset((char *)a->data,0,sizeof(long)+1);

		}

	if (a->data == NULL)

		{

		ASN1err(ASN1_F_ASN1_ENUMERATED_SET,ERR_R_MALLOC_FAILURE);

		return(0);

		}

	d=v;

	if (d < 0)

		{

		d= -d;

		a->type=V_ASN1_NEG_ENUMERATED;

		}

	for (i=0; i<sizeof(long); i++)

		{

		if (d == 0) break;

		buf[i]=(int)d&0xff;

		d>>=8;

		}

	j=0;

	for (k=i-1; k >=0; k--)

		a->data[j++]=buf[k];

	a->length=j;

	return(1);

	}

EXPORT_C long ASN1_ENUMERATED_get(ASN1_ENUMERATED *a)

	{

	int neg=0,i;

	long r=0;

	if (a == NULL) return(0L);

	i=a->type;

	if (i == V_ASN1_NEG_ENUMERATED)

		neg=1;

	else if (i != V_ASN1_ENUMERATED)

		return -1;

	if (a->length > (int)sizeof(long))

		{

		/* hmm... a bit ugly */

		return(0xffffffffL);

		}

	if (a->data == NULL)

		return 0;

	for (i=0; i<a->length; i++)

		{

		r<<=8;

		r|=(unsigned char)a->data[i];

		}

	if (neg) r= -r;

	return(r);

	}

EXPORT_C ASN1_ENUMERATED *BN_to_ASN1_ENUMERATED(BIGNUM *bn, ASN1_ENUMERATED *ai)

	{

	ASN1_ENUMERATED *ret;

	int len,j;

	if (ai == NULL)

		ret=M_ASN1_ENUMERATED_new();

	else

		ret=ai;

	if (ret == NULL)

		{

		ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED,ERR_R_NESTED_ASN1_ERROR);

		goto err;

		}

	if(BN_is_negative(bn)) ret->type = V_ASN1_NEG_ENUMERATED;

	else ret->type=V_ASN1_ENUMERATED;

	j=BN_num_bits(bn);

	len=((j == 0)?0:((j/8)+1));

	if (ret->length < len+4)

		{

		unsigned char *new_data=OPENSSL_realloc(ret->data, len+4);

		if (!new_data)

			{

			ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED,ERR_R_MALLOC_FAILURE);

			goto err;

			}

		ret->data=new_data;

		}

	ret->length=BN_bn2bin(bn,ret->data);

	return(ret);

err:

	if (ret != ai) M_ASN1_ENUMERATED_free(ret);

	return(NULL);

	}

EXPORT_C BIGNUM *ASN1_ENUMERATED_to_BN(ASN1_ENUMERATED *ai, BIGNUM *bn)

	{

	BIGNUM *ret;

	if ((ret=BN_bin2bn(ai->data,ai->length,bn)) == NULL)

		ASN1err(ASN1_F_ASN1_ENUMERATED_TO_BN,ASN1_R_BN_LIB);

	else if(ai->type == V_ASN1_NEG_ENUMERATED) BN_set_negative(ret,1);

	return(ret);

	}