a_enum.c

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/* crypto/asn1/a_enum.c */
/* Copyright (C) 1995-1998 Eric Young ([email protected])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([email protected]).
 * 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 ([email protected]).
 * 
 * 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 ([email protected])"
 *    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 ([email protected])"
 * 
 * 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
 */

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);
    }

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);
    }

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);
    }

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);
    }