/* crypto/ec/ec_print.c */

/* ====================================================================

 * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.

 *

 * 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 above 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 acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"

 *

 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

 *    endorse or promote products derived from this software without

 *    prior written permission. For written permission, please contact

 *    openssl-core@openssl.org.

 *

 * 5. Products derived from this software may not be called "OpenSSL"

 *    nor may "OpenSSL" appear in their names without prior written

 *    permission of the OpenSSL Project.

 *

 * 6. Redistributions of any form whatsoever must retain the following

 *    acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"

 *

 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

 * EXPRESSED 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 OpenSSL PROJECT OR

 * ITS 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.

 * ====================================================================

 *

 * This product includes cryptographic software written by Eric Young

 * (eay@cryptsoft.com).  This product includes software written by Tim

 * Hudson (tjh@cryptsoft.com).

 *

 */

#include <openssl/crypto.h>

#include "ec_lcl.h"

BIGNUM *EC_POINT_point2bn(const EC_GROUP *group,

                          const EC_POINT *point,

                          point_conversion_form_t form,

                          BIGNUM *ret, BN_CTX *ctx)

{

    size_t buf_len = 0;

    unsigned char *buf;

    buf_len = EC_POINT_point2oct(group, point, form, NULL, 0, ctx);

    if (buf_len == 0)

        return NULL;

    if ((buf = OPENSSL_malloc(buf_len)) == NULL)

        return NULL;

    if (!EC_POINT_point2oct(group, point, form, buf, buf_len, ctx)) {

        OPENSSL_free(buf);

        return NULL;

    }

    ret = BN_bin2bn(buf, buf_len, ret);

    OPENSSL_free(buf);

    return ret;

}

EC_POINT *EC_POINT_bn2point(const EC_GROUP *group,

                            const BIGNUM *bn, EC_POINT *point, BN_CTX *ctx)

{

    size_t buf_len = 0;

    unsigned char *buf;

    EC_POINT *ret;

    if ((buf_len = BN_num_bytes(bn)) == 0)

        return NULL;

    buf = OPENSSL_malloc(buf_len);

    if (buf == NULL)

        return NULL;

    if (!BN_bn2bin(bn, buf)) {

        OPENSSL_free(buf);

        return NULL;

    }

    if (point == NULL) {

        if ((ret = EC_POINT_new(group)) == NULL) {

            OPENSSL_free(buf);

            return NULL;

        }

    } else

        ret = point;

    if (!EC_POINT_oct2point(group, ret, buf, buf_len, ctx)) {

        if (point == NULL)

            EC_POINT_clear_free(ret);

        OPENSSL_free(buf);

        return NULL;

    }

    OPENSSL_free(buf);

    return ret;

}

static const char *HEX_DIGITS = "0123456789ABCDEF";

/* the return value must be freed (using OPENSSL_free()) */

char *EC_POINT_point2hex(const EC_GROUP *group,

                         const EC_POINT *point,

                         point_conversion_form_t form, BN_CTX *ctx)

{

    char *ret, *p;

    size_t buf_len = 0, i;

    unsigned char *buf, *pbuf;

    buf_len = EC_POINT_point2oct(group, point, form, NULL, 0, ctx);

    if (buf_len == 0)

        return NULL;

    if ((buf = OPENSSL_malloc(buf_len)) == NULL)

        return NULL;

    if (!EC_POINT_point2oct(group, point, form, buf, buf_len, ctx)) {

        OPENSSL_free(buf);

        return NULL;

    }

    ret = (char *)OPENSSL_malloc(buf_len * 2 + 2);

    if (ret == NULL) {

        OPENSSL_free(buf);

        return NULL;

    }

    p = ret;

    pbuf = buf;

    for (i = buf_len; i > 0; i--) {

        int v = (int)*(pbuf++);

        *(p++) = HEX_DIGITS[v >> 4];

        *(p++) = HEX_DIGITS[v & 0x0F];

    }

    *p = '\0';

    OPENSSL_free(buf);

    return ret;

}

EC_POINT *EC_POINT_hex2point(const EC_GROUP *group,

                             const char *buf, EC_POINT *point, BN_CTX *ctx)

{

    EC_POINT *ret = NULL;

    BIGNUM *tmp_bn = NULL;

    if (!BN_hex2bn(&tmp_bn, buf))

        return NULL;

    ret = EC_POINT_bn2point(group, tmp_bn, point, ctx);

    BN_clear_free(tmp_bn);

    return ret;

}