sl@0: /* crypto/asn1/a_enum.c */
sl@0: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
sl@0:  * All rights reserved.
sl@0:  *
sl@0:  * This package is an SSL implementation written
sl@0:  * by Eric Young (eay@cryptsoft.com).
sl@0:  * The implementation was written so as to conform with Netscapes SSL.
sl@0:  * 
sl@0:  * This library is free for commercial and non-commercial use as long as
sl@0:  * the following conditions are aheared to.  The following conditions
sl@0:  * apply to all code found in this distribution, be it the RC4, RSA,
sl@0:  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
sl@0:  * included with this distribution is covered by the same copyright terms
sl@0:  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
sl@0:  * 
sl@0:  * Copyright remains Eric Young's, and as such any Copyright notices in
sl@0:  * the code are not to be removed.
sl@0:  * If this package is used in a product, Eric Young should be given attribution
sl@0:  * as the author of the parts of the library used.
sl@0:  * This can be in the form of a textual message at program startup or
sl@0:  * in documentation (online or textual) provided with the package.
sl@0:  * 
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  * 1. Redistributions of source code must retain the copyright
sl@0:  *    notice, this list of conditions and the following disclaimer.
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in the
sl@0:  *    documentation and/or other materials provided with the distribution.
sl@0:  * 3. All advertising materials mentioning features or use of this software
sl@0:  *    must display the following acknowledgement:
sl@0:  *    "This product includes cryptographic software written by
sl@0:  *     Eric Young (eay@cryptsoft.com)"
sl@0:  *    The word 'cryptographic' can be left out if the rouines from the library
sl@0:  *    being used are not cryptographic related :-).
sl@0:  * 4. If you include any Windows specific code (or a derivative thereof) from 
sl@0:  *    the apps directory (application code) you must include an acknowledgement:
sl@0:  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
sl@0:  * 
sl@0:  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
sl@0:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
sl@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
sl@0:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
sl@0:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
sl@0:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
sl@0:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
sl@0:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
sl@0:  * SUCH DAMAGE.
sl@0:  * 
sl@0:  * The licence and distribution terms for any publically available version or
sl@0:  * derivative of this code cannot be changed.  i.e. this code cannot simply be
sl@0:  * copied and put under another distribution licence
sl@0:  * [including the GNU Public Licence.]
sl@0:  */
sl@0: 
sl@0: #include <stdio.h>
sl@0: #include "cryptlib.h"
sl@0: #include <openssl/asn1.h>
sl@0: #include <openssl/bn.h>
sl@0: 
sl@0: /* 
sl@0:  * Code for ENUMERATED type: identical to INTEGER apart from a different tag.
sl@0:  * for comments on encoding see a_int.c
sl@0:  */
sl@0: 
sl@0: EXPORT_C int ASN1_ENUMERATED_set(ASN1_ENUMERATED *a, long v)
sl@0: 	{
sl@0: 	int j,k;
sl@0: 	unsigned int i;
sl@0: 	unsigned char buf[sizeof(long)+1];
sl@0: 	long d;
sl@0: 
sl@0: 	a->type=V_ASN1_ENUMERATED;
sl@0: 	if (a->length < (int)(sizeof(long)+1))
sl@0: 		{
sl@0: 		if (a->data != NULL)
sl@0: 			OPENSSL_free(a->data);
sl@0: 		if ((a->data=(unsigned char *)OPENSSL_malloc(sizeof(long)+1)) != NULL)
sl@0: 			memset((char *)a->data,0,sizeof(long)+1);
sl@0: 		}
sl@0: 	if (a->data == NULL)
sl@0: 		{
sl@0: 		ASN1err(ASN1_F_ASN1_ENUMERATED_SET,ERR_R_MALLOC_FAILURE);
sl@0: 		return(0);
sl@0: 		}
sl@0: 	d=v;
sl@0: 	if (d < 0)
sl@0: 		{
sl@0: 		d= -d;
sl@0: 		a->type=V_ASN1_NEG_ENUMERATED;
sl@0: 		}
sl@0: 
sl@0: 	for (i=0; i<sizeof(long); i++)
sl@0: 		{
sl@0: 		if (d == 0) break;
sl@0: 		buf[i]=(int)d&0xff;
sl@0: 		d>>=8;
sl@0: 		}
sl@0: 	j=0;
sl@0: 	for (k=i-1; k >=0; k--)
sl@0: 		a->data[j++]=buf[k];
sl@0: 	a->length=j;
sl@0: 	return(1);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C long ASN1_ENUMERATED_get(ASN1_ENUMERATED *a)
sl@0: 	{
sl@0: 	int neg=0,i;
sl@0: 	long r=0;
sl@0: 
sl@0: 	if (a == NULL) return(0L);
sl@0: 	i=a->type;
sl@0: 	if (i == V_ASN1_NEG_ENUMERATED)
sl@0: 		neg=1;
sl@0: 	else if (i != V_ASN1_ENUMERATED)
sl@0: 		return -1;
sl@0: 	
sl@0: 	if (a->length > (int)sizeof(long))
sl@0: 		{
sl@0: 		/* hmm... a bit ugly */
sl@0: 		return(0xffffffffL);
sl@0: 		}
sl@0: 	if (a->data == NULL)
sl@0: 		return 0;
sl@0: 
sl@0: 	for (i=0; i<a->length; i++)
sl@0: 		{
sl@0: 		r<<=8;
sl@0: 		r|=(unsigned char)a->data[i];
sl@0: 		}
sl@0: 	if (neg) r= -r;
sl@0: 	return(r);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C ASN1_ENUMERATED *BN_to_ASN1_ENUMERATED(BIGNUM *bn, ASN1_ENUMERATED *ai)
sl@0: 	{
sl@0: 	ASN1_ENUMERATED *ret;
sl@0: 	int len,j;
sl@0: 
sl@0: 	if (ai == NULL)
sl@0: 		ret=M_ASN1_ENUMERATED_new();
sl@0: 	else
sl@0: 		ret=ai;
sl@0: 	if (ret == NULL)
sl@0: 		{
sl@0: 		ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED,ERR_R_NESTED_ASN1_ERROR);
sl@0: 		goto err;
sl@0: 		}
sl@0: 	if(BN_is_negative(bn)) ret->type = V_ASN1_NEG_ENUMERATED;
sl@0: 	else ret->type=V_ASN1_ENUMERATED;
sl@0: 	j=BN_num_bits(bn);
sl@0: 	len=((j == 0)?0:((j/8)+1));
sl@0: 	if (ret->length < len+4)
sl@0: 		{
sl@0: 		unsigned char *new_data=OPENSSL_realloc(ret->data, len+4);
sl@0: 		if (!new_data)
sl@0: 			{
sl@0: 			ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED,ERR_R_MALLOC_FAILURE);
sl@0: 			goto err;
sl@0: 			}
sl@0: 		ret->data=new_data;
sl@0: 		}
sl@0: 
sl@0: 	ret->length=BN_bn2bin(bn,ret->data);
sl@0: 	return(ret);
sl@0: err:
sl@0: 	if (ret != ai) M_ASN1_ENUMERATED_free(ret);
sl@0: 	return(NULL);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C BIGNUM *ASN1_ENUMERATED_to_BN(ASN1_ENUMERATED *ai, BIGNUM *bn)
sl@0: 	{
sl@0: 	BIGNUM *ret;
sl@0: 
sl@0: 	if ((ret=BN_bin2bn(ai->data,ai->length,bn)) == NULL)
sl@0: 		ASN1err(ASN1_F_ASN1_ENUMERATED_TO_BN,ASN1_R_BN_LIB);
sl@0: 	else if(ai->type == V_ASN1_NEG_ENUMERATED) BN_set_negative(ret,1);
sl@0: 	return(ret);
sl@0: 	}