/* 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);

 	}