/* crypto/ec/eck_prn.c */

/*

 * Written by Nils Larsch for the OpenSSL project.

 */

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

 * Copyright (c) 1998-2005 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).

 *

 */

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

 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.

 * Portions originally developed by SUN MICROSYSTEMS, INC., and

 * contributed to the OpenSSL project.

 */

#include <stdio.h>

#include "cryptlib.h"

#include <openssl/evp.h>

#include <openssl/ec.h>

#include <openssl/bn.h>

#ifndef OPENSSL_NO_FP_API

int ECPKParameters_print_fp(FILE *fp, const EC_GROUP *x, int off)

{

    BIO *b;

    int ret;

    if ((b = BIO_new(BIO_s_file())) == NULL) {

        ECerr(EC_F_ECPKPARAMETERS_PRINT_FP, ERR_R_BUF_LIB);

        return (0);

    }

    BIO_set_fp(b, fp, BIO_NOCLOSE);

    ret = ECPKParameters_print(b, x, off);

    BIO_free(b);

    return (ret);

}

int EC_KEY_print_fp(FILE *fp, const EC_KEY *x, int off)

{

    BIO *b;

    int ret;

    if ((b = BIO_new(BIO_s_file())) == NULL) {

        ECerr(EC_F_EC_KEY_PRINT_FP, ERR_R_BIO_LIB);

        return (0);

    }

    BIO_set_fp(b, fp, BIO_NOCLOSE);

    ret = EC_KEY_print(b, x, off);

    BIO_free(b);

    return (ret);

}

int ECParameters_print_fp(FILE *fp, const EC_KEY *x)

{

    BIO *b;

    int ret;

    if ((b = BIO_new(BIO_s_file())) == NULL) {

        ECerr(EC_F_ECPARAMETERS_PRINT_FP, ERR_R_BIO_LIB);

        return (0);

    }

    BIO_set_fp(b, fp, BIO_NOCLOSE);

    ret = ECParameters_print(b, x);

    BIO_free(b);

    return (ret);

}

#endif

int EC_KEY_print(BIO *bp, const EC_KEY *x, int off)

{

    EVP_PKEY *pk;

    int ret;

    pk = EVP_PKEY_new();

    if (!pk || !EVP_PKEY_set1_EC_KEY(pk, (EC_KEY *)x))

        return 0;

    ret = EVP_PKEY_print_private(bp, pk, off, NULL);

    EVP_PKEY_free(pk);

    return ret;

}

int ECParameters_print(BIO *bp, const EC_KEY *x)

{

    EVP_PKEY *pk;

    int ret;

    pk = EVP_PKEY_new();

    if (!pk || !EVP_PKEY_set1_EC_KEY(pk, (EC_KEY *)x))

        return 0;

    ret = EVP_PKEY_print_params(bp, pk, 4, NULL);

    EVP_PKEY_free(pk);

    return ret;

}

static int print_bin(BIO *fp, const char *str, const unsigned char *num,

                     size_t len, int off);

int ECPKParameters_print(BIO *bp, const EC_GROUP *x, int off)

{

    unsigned char *buffer = NULL;

    size_t buf_len = 0, i;

    int ret = 0, reason = ERR_R_BIO_LIB;

    BN_CTX *ctx = NULL;

    const EC_POINT *point = NULL;

    BIGNUM *p = NULL, *a = NULL, *b = NULL, *gen = NULL,

        *order = NULL, *cofactor = NULL;

    const unsigned char *seed;

    size_t seed_len = 0;

    static const char *gen_compressed = "Generator (compressed):";

    static const char *gen_uncompressed = "Generator (uncompressed):";

    static const char *gen_hybrid = "Generator (hybrid):";

    if (!x) {

        reason = ERR_R_PASSED_NULL_PARAMETER;

        goto err;

    }

    ctx = BN_CTX_new();

    if (ctx == NULL) {

        reason = ERR_R_MALLOC_FAILURE;

        goto err;

    }

    if (EC_GROUP_get_asn1_flag(x)) {

        /* the curve parameter are given by an asn1 OID */

        int nid;

        const char *nname;

        if (!BIO_indent(bp, off, 128))

            goto err;

        nid = EC_GROUP_get_curve_name(x);

        if (nid == 0)

            goto err;

        if (BIO_printf(bp, "ASN1 OID: %s", OBJ_nid2sn(nid)) <= 0)

            goto err;

        if (BIO_printf(bp, "\n") <= 0)

            goto err;

        nname = EC_curve_nid2nist(nid);

        if (nname) {

            if (!BIO_indent(bp, off, 128))

                goto err;

            if (BIO_printf(bp, "NIST CURVE: %s\n", nname) <= 0)

                goto err;

        }

    } else {

        /* explicit parameters */

        int is_char_two = 0;

        point_conversion_form_t form;

        int tmp_nid = EC_METHOD_get_field_type(EC_GROUP_method_of(x));

        if (tmp_nid == NID_X9_62_characteristic_two_field)

            is_char_two = 1;

        if ((p = BN_new()) == NULL || (a = BN_new()) == NULL ||

            (b = BN_new()) == NULL || (order = BN_new()) == NULL ||

            (cofactor = BN_new()) == NULL) {

            reason = ERR_R_MALLOC_FAILURE;

            goto err;

        }

#ifndef OPENSSL_NO_EC2M

        if (is_char_two) {

            if (!EC_GROUP_get_curve_GF2m(x, p, a, b, ctx)) {

                reason = ERR_R_EC_LIB;

                goto err;

            }

        } else                  /* prime field */

#endif

        {

            if (!EC_GROUP_get_curve_GFp(x, p, a, b, ctx)) {

                reason = ERR_R_EC_LIB;

                goto err;

            }

        }

        if ((point = EC_GROUP_get0_generator(x)) == NULL) {

            reason = ERR_R_EC_LIB;

            goto err;

        }

        if (!EC_GROUP_get_order(x, order, NULL) ||

            !EC_GROUP_get_cofactor(x, cofactor, NULL)) {

            reason = ERR_R_EC_LIB;

            goto err;

        }

        form = EC_GROUP_get_point_conversion_form(x);

        if ((gen = EC_POINT_point2bn(x, point, form, NULL, ctx)) == NULL) {

            reason = ERR_R_EC_LIB;

            goto err;

        }

        buf_len = (size_t)BN_num_bytes(p);

        if (buf_len < (i = (size_t)BN_num_bytes(a)))

            buf_len = i;

        if (buf_len < (i = (size_t)BN_num_bytes(b)))

            buf_len = i;

        if (buf_len < (i = (size_t)BN_num_bytes(gen)))

            buf_len = i;

        if (buf_len < (i = (size_t)BN_num_bytes(order)))

            buf_len = i;

        if (buf_len < (i = (size_t)BN_num_bytes(cofactor)))

            buf_len = i;

        if ((seed = EC_GROUP_get0_seed(x)) != NULL)

            seed_len = EC_GROUP_get_seed_len(x);

        buf_len += 10;

        if ((buffer = OPENSSL_malloc(buf_len)) == NULL) {

            reason = ERR_R_MALLOC_FAILURE;

            goto err;

        }

        if (!BIO_indent(bp, off, 128))

            goto err;

        /* print the 'short name' of the field type */

        if (BIO_printf(bp, "Field Type: %s\n", OBJ_nid2sn(tmp_nid))

            <= 0)

            goto err;

        if (is_char_two) {

            /* print the 'short name' of the base type OID */

            int basis_type = EC_GROUP_get_basis_type(x);

            if (basis_type == 0)

                goto err;

            if (!BIO_indent(bp, off, 128))

                goto err;

            if (BIO_printf(bp, "Basis Type: %s\n",

                           OBJ_nid2sn(basis_type)) <= 0)

                goto err;

            /* print the polynomial */

            if ((p != NULL) && !ASN1_bn_print(bp, "Polynomial:", p, buffer,

                                              off))

                goto err;

        } else {

            if ((p != NULL) && !ASN1_bn_print(bp, "Prime:", p, buffer, off))

                goto err;

        }

        if ((a != NULL) && !ASN1_bn_print(bp, "A:   ", a, buffer, off))

            goto err;

        if ((b != NULL) && !ASN1_bn_print(bp, "B:   ", b, buffer, off))

            goto err;

        if (form == POINT_CONVERSION_COMPRESSED) {

            if ((gen != NULL) && !ASN1_bn_print(bp, gen_compressed, gen,

                                                buffer, off))

                goto err;

        } else if (form == POINT_CONVERSION_UNCOMPRESSED) {

            if ((gen != NULL) && !ASN1_bn_print(bp, gen_uncompressed, gen,

                                                buffer, off))

                goto err;

        } else {                /* form == POINT_CONVERSION_HYBRID */

            if ((gen != NULL) && !ASN1_bn_print(bp, gen_hybrid, gen,

                                                buffer, off))

                goto err;

        }

        if ((order != NULL) && !ASN1_bn_print(bp, "Order: ", order,

                                              buffer, off))

            goto err;

        if ((cofactor != NULL) && !ASN1_bn_print(bp, "Cofactor: ", cofactor,

                                                 buffer, off))

            goto err;

        if (seed && !print_bin(bp, "Seed:", seed, seed_len, off))

            goto err;

    }

    ret = 1;

 err:

    if (!ret)

        ECerr(EC_F_ECPKPARAMETERS_PRINT, reason);

    if (p)

        BN_free(p);

    if (a)

        BN_free(a);

    if (b)

        BN_free(b);

    if (gen)

        BN_free(gen);

    if (order)

        BN_free(order);

    if (cofactor)

        BN_free(cofactor);

    if (ctx)

        BN_CTX_free(ctx);

    if (buffer != NULL)

        OPENSSL_free(buffer);

    return (ret);

}

static int print_bin(BIO *fp, const char *name, const unsigned char *buf,

                     size_t len, int off)

{

    size_t i;

    char str[128 + 1 + 4];

    if (buf == NULL)

        return 1;

    if (off > 0) {

        if (off > 128)

            off = 128;

        memset(str, ' ', off);

        if (BIO_write(fp, str, off) <= 0)

            return 0;

    } else {

        off = 0;

    }

    if (BIO_printf(fp, "%s", name) <= 0)

        return 0;

    for (i = 0; i < len; i++) {

        if ((i % 15) == 0) {

            str[0] = '\n';

            memset(&(str[1]), ' ', off + 4);

            if (BIO_write(fp, str, off + 1 + 4) <= 0)

                return 0;

        }

        if (BIO_printf(fp, "%02x%s", buf[i], ((i + 1) == len) ? "" : ":") <=

            0)

            return 0;

    }

    if (BIO_write(fp, "\n", 1) <= 0)

        return 0;

    return 1;

}