/* $OpenBSD: eck_prn.c,v 1.17 2021/04/20 17:12:43 tb Exp $ */
/*
 * 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 <string.h>

#include <openssl/bn.h>
#include <openssl/ec.h>
#include <openssl/err.h>
#include <openssl/evp.h>

int 
ECPKParameters_print_fp(FILE * fp, const EC_GROUP * x, int off)
{
        BIO *b;
        int ret;

        if ((b = BIO_new(BIO_s_file())) == NULL) {
                ECerror(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) {
                ECerror(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) {
                ECerror(ERR_R_BIO_LIB);
                return (0);
        }
        BIO_set_fp(b, fp, BIO_NOCLOSE);
        ret = ECParameters_print(b, x);
        BIO_free(b);
        return (ret);
}

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;
        const char *nname;

        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;

                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;
                }
                if (!EC_GROUP_get_curve(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 = 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)
                ECerror(reason);
        BN_free(p);
        BN_free(a);
        BN_free(b);
        BN_free(gen);
        BN_free(order);
        BN_free(cofactor);
        BN_CTX_free(ctx);
        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];

        if (buf == NULL)
                return 1;
        if (off) {
                if (off > 128)
                        off = 128;
                memset(str, ' ', off);
                if (BIO_write(fp, str, off) <= 0)
                        return 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;
}