/* 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

 */

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);

}