607 lines
16 KiB
C
607 lines
16 KiB
C
/* $OpenBSD: ecparam.c,v 1.23 2023/03/06 14:32:06 tb Exp $ */
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/*
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* Written by Nils Larsch for the OpenSSL project.
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*/
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/* ====================================================================
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* Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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/* ====================================================================
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* Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
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*
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* Portions of the attached software ("Contribution") are developed by
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* SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
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*
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* The Contribution is licensed pursuant to the OpenSSL open source
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* license provided above.
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*
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* The elliptic curve binary polynomial software is originally written by
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* Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems Laboratories.
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*
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*/
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#include <openssl/opensslconf.h>
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#ifndef OPENSSL_NO_EC
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include "apps.h"
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#include <openssl/bio.h>
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#include <openssl/bn.h>
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#include <openssl/ec.h>
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#include <openssl/err.h>
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#include <openssl/pem.h>
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#include <openssl/x509.h>
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static int ecparam_print_var(BIO *, BIGNUM *, const char *, int,
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unsigned char *);
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static struct {
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int C;
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int asn1_flag;
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int check;
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char *curve_name;
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point_conversion_form_t form;
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int genkey;
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char *infile;
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int informat;
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int list_curves;
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int new_asn1_flag;
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int new_form;
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int no_seed;
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int noout;
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char *outfile;
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int outformat;
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int text;
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} cfg;
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static int
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ecparam_opt_form(char *arg)
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{
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if (strcmp(arg, "compressed") == 0)
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cfg.form = POINT_CONVERSION_COMPRESSED;
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else if (strcmp(arg, "uncompressed") == 0)
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cfg.form = POINT_CONVERSION_UNCOMPRESSED;
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else if (strcmp(arg, "hybrid") == 0)
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cfg.form = POINT_CONVERSION_HYBRID;
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else
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return (1);
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cfg.new_form = 1;
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return (0);
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}
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static int
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ecparam_opt_enctype(char *arg)
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{
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if (strcmp(arg, "explicit") == 0)
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cfg.asn1_flag = 0;
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else if (strcmp(arg, "named_curve") == 0)
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cfg.asn1_flag = OPENSSL_EC_NAMED_CURVE;
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else
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return (1);
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cfg.new_asn1_flag = 1;
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return (0);
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}
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static const struct option ecparam_options[] = {
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{
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.name = "C",
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.desc = "Convert the EC parameters into C code",
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.type = OPTION_FLAG,
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.opt.flag = &cfg.C,
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},
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{
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.name = "check",
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.desc = "Validate the elliptic curve parameters",
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.type = OPTION_FLAG,
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.opt.flag = &cfg.check,
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},
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{
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.name = "conv_form",
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.argname = "form",
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.desc = "Specify point conversion form:\n"
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" compressed, uncompressed (default), hybrid",
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.type = OPTION_ARG_FUNC,
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.opt.argfunc = ecparam_opt_form,
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},
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{
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.name = "genkey",
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.desc = "Generate an EC private key using the specified "
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"parameters",
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.type = OPTION_FLAG,
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.opt.flag = &cfg.genkey,
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},
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{
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.name = "in",
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.argname = "file",
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.desc = "Input file to read parameters from (default stdin)",
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.type = OPTION_ARG,
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.opt.arg = &cfg.infile,
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},
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{
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.name = "inform",
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.argname = "format",
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.desc = "Input format (DER or PEM)",
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.type = OPTION_ARG_FORMAT,
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.opt.value = &cfg.informat,
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},
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{
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.name = "list_curves",
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.desc = "Print list of all currently implemented EC "
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"parameter names",
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.type = OPTION_FLAG,
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.opt.flag = &cfg.list_curves,
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},
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{
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.name = "name",
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.argname = "curve",
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.desc = "Use the EC parameters with the specified name",
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.type = OPTION_ARG,
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.opt.arg = &cfg.curve_name,
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},
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{
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.name = "no_seed",
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.desc = "Do not output seed with explicit parameter encoding",
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.type = OPTION_FLAG,
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.opt.flag = &cfg.no_seed,
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},
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{
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.name = "noout",
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.desc = "Do not output encoded version of EC parameters",
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.type = OPTION_FLAG,
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.opt.flag = &cfg.noout,
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},
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{
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.name = "out",
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.argname = "file",
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.desc = "Output file to write parameters to (default stdout)",
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.type = OPTION_ARG,
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.opt.arg = &cfg.outfile,
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},
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{
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.name = "outform",
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.argname = "format",
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.desc = "Output format (DER or PEM)",
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.type = OPTION_ARG_FORMAT,
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.opt.value = &cfg.outformat,
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},
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{
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.name = "param_enc",
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.argname = "type",
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.desc = "Specify EC parameter ASN.1 encoding type:\n"
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" explicit, named_curve (default)",
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.type = OPTION_ARG_FUNC,
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.opt.argfunc = ecparam_opt_enctype,
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},
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{
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.name = "text",
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.desc = "Print out the EC parameters in human readable form",
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.type = OPTION_FLAG,
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.opt.flag = &cfg.text,
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},
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{NULL},
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};
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static void
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ecparam_usage(void)
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{
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fprintf(stderr, "usage: ecparam [-C] [-check] [-conv_form arg] "
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" [-genkey]\n"
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" [-in file] [-inform DER | PEM] [-list_curves] [-name arg]\n"
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" [-no_seed] [-noout] [-out file] [-outform DER | PEM]\n"
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" [-param_enc arg] [-text]\n\n");
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options_usage(ecparam_options);
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}
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int
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ecparam_main(int argc, char **argv)
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{
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BIGNUM *ec_p = NULL, *ec_a = NULL, *ec_b = NULL, *ec_gen = NULL;
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BIGNUM *ec_order = NULL, *ec_cofactor = NULL;
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EC_GROUP *group = NULL;
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unsigned char *buffer = NULL;
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BIO *in = NULL, *out = NULL;
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int i, ret = 1;
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if (pledge("stdio cpath wpath rpath", NULL) == -1) {
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perror("pledge");
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exit(1);
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}
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memset(&cfg, 0, sizeof(cfg));
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cfg.asn1_flag = OPENSSL_EC_NAMED_CURVE;
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cfg.form = POINT_CONVERSION_UNCOMPRESSED;
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cfg.informat = FORMAT_PEM;
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cfg.outformat = FORMAT_PEM;
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if (options_parse(argc, argv, ecparam_options, NULL, NULL) != 0) {
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ecparam_usage();
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goto end;
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}
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in = BIO_new(BIO_s_file());
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out = BIO_new(BIO_s_file());
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if ((in == NULL) || (out == NULL)) {
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ERR_print_errors(bio_err);
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goto end;
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}
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if (cfg.infile == NULL)
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BIO_set_fp(in, stdin, BIO_NOCLOSE);
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else {
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if (BIO_read_filename(in, cfg.infile) <= 0) {
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perror(cfg.infile);
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goto end;
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}
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}
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if (cfg.outfile == NULL) {
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BIO_set_fp(out, stdout, BIO_NOCLOSE);
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} else {
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if (BIO_write_filename(out, cfg.outfile) <= 0) {
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perror(cfg.outfile);
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goto end;
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}
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}
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if (cfg.list_curves) {
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EC_builtin_curve *curves = NULL;
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size_t crv_len = 0;
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size_t n = 0;
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crv_len = EC_get_builtin_curves(NULL, 0);
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curves = reallocarray(NULL, crv_len, sizeof(EC_builtin_curve));
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if (curves == NULL)
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goto end;
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if (!EC_get_builtin_curves(curves, crv_len)) {
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free(curves);
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goto end;
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}
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for (n = 0; n < crv_len; n++) {
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const char *comment;
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const char *sname;
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comment = curves[n].comment;
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sname = OBJ_nid2sn(curves[n].nid);
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if (comment == NULL)
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comment = "CURVE DESCRIPTION NOT AVAILABLE";
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if (sname == NULL)
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sname = "";
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BIO_printf(out, " %-10s: ", sname);
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BIO_printf(out, "%s\n", comment);
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}
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free(curves);
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ret = 0;
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goto end;
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}
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if (cfg.curve_name != NULL) {
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int nid;
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/*
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* workaround for the SECG curve names secp192r1 and
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* secp256r1 (which are the same as the curves prime192v1 and
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* prime256v1 defined in X9.62)
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*/
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if (!strcmp(cfg.curve_name, "secp192r1")) {
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BIO_printf(bio_err, "using curve name prime192v1 "
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"instead of secp192r1\n");
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nid = NID_X9_62_prime192v1;
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} else if (!strcmp(cfg.curve_name, "secp256r1")) {
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BIO_printf(bio_err, "using curve name prime256v1 "
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"instead of secp256r1\n");
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nid = NID_X9_62_prime256v1;
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} else
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nid = OBJ_sn2nid(cfg.curve_name);
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if (nid == 0)
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nid = EC_curve_nist2nid(cfg.curve_name);
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if (nid == 0) {
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BIO_printf(bio_err, "unknown curve name (%s)\n",
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cfg.curve_name);
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goto end;
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}
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group = EC_GROUP_new_by_curve_name(nid);
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if (group == NULL) {
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BIO_printf(bio_err, "unable to create curve (%s)\n",
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cfg.curve_name);
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goto end;
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}
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EC_GROUP_set_asn1_flag(group, cfg.asn1_flag);
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EC_GROUP_set_point_conversion_form(group, cfg.form);
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} else if (cfg.informat == FORMAT_ASN1) {
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group = d2i_ECPKParameters_bio(in, NULL);
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} else if (cfg.informat == FORMAT_PEM) {
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group = PEM_read_bio_ECPKParameters(in, NULL, NULL, NULL);
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} else {
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BIO_printf(bio_err, "bad input format specified\n");
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goto end;
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}
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if (group == NULL) {
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BIO_printf(bio_err,
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"unable to load elliptic curve parameters\n");
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ERR_print_errors(bio_err);
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goto end;
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}
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if (cfg.new_form)
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EC_GROUP_set_point_conversion_form(group, cfg.form);
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if (cfg.new_asn1_flag)
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EC_GROUP_set_asn1_flag(group, cfg.asn1_flag);
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if (cfg.no_seed)
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EC_GROUP_set_seed(group, NULL, 0);
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if (cfg.text) {
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if (!ECPKParameters_print(out, group, 0))
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goto end;
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}
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if (cfg.check) {
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BIO_printf(bio_err, "checking elliptic curve parameters: ");
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if (!EC_GROUP_check(group, NULL)) {
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BIO_printf(bio_err, "failed\n");
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ERR_print_errors(bio_err);
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} else
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BIO_printf(bio_err, "ok\n");
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}
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if (cfg.C) {
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size_t buf_len = 0, tmp_len = 0;
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const EC_POINT *point;
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int is_prime, len = 0;
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const EC_METHOD *meth = EC_GROUP_method_of(group);
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if ((ec_p = BN_new()) == NULL || (ec_a = BN_new()) == NULL ||
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(ec_b = BN_new()) == NULL || (ec_gen = BN_new()) == NULL ||
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(ec_order = BN_new()) == NULL ||
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(ec_cofactor = BN_new()) == NULL) {
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perror("malloc");
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goto end;
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}
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is_prime = (EC_METHOD_get_field_type(meth) ==
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NID_X9_62_prime_field);
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if (!EC_GROUP_get_curve(group, ec_p, ec_a, ec_b, NULL))
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goto end;
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if ((point = EC_GROUP_get0_generator(group)) == NULL)
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goto end;
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if (!EC_POINT_point2bn(group, point,
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EC_GROUP_get_point_conversion_form(group), ec_gen,
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NULL))
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goto end;
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if (!EC_GROUP_get_order(group, ec_order, NULL))
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goto end;
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if (!EC_GROUP_get_cofactor(group, ec_cofactor, NULL))
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goto end;
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len = BN_num_bits(ec_order);
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if ((tmp_len = (size_t) BN_num_bytes(ec_p)) > buf_len)
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buf_len = tmp_len;
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if ((tmp_len = (size_t) BN_num_bytes(ec_a)) > buf_len)
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buf_len = tmp_len;
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if ((tmp_len = (size_t) BN_num_bytes(ec_b)) > buf_len)
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buf_len = tmp_len;
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if ((tmp_len = (size_t) BN_num_bytes(ec_gen)) > buf_len)
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buf_len = tmp_len;
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if ((tmp_len = (size_t) BN_num_bytes(ec_order)) > buf_len)
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buf_len = tmp_len;
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if ((tmp_len = (size_t) BN_num_bytes(ec_cofactor)) > buf_len)
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buf_len = tmp_len;
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buffer = malloc(buf_len);
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if (buffer == NULL) {
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perror("malloc");
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goto end;
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}
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ecparam_print_var(out, ec_p, "ec_p", len, buffer);
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ecparam_print_var(out, ec_a, "ec_a", len, buffer);
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ecparam_print_var(out, ec_b, "ec_b", len, buffer);
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ecparam_print_var(out, ec_gen, "ec_gen", len, buffer);
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ecparam_print_var(out, ec_order, "ec_order", len, buffer);
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ecparam_print_var(out, ec_cofactor, "ec_cofactor", len,
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buffer);
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BIO_printf(out, "\n\n");
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BIO_printf(out, "EC_GROUP *get_ec_group_%d(void)\n\t{\n", len);
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BIO_printf(out, "\tint ok=0;\n");
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BIO_printf(out, "\tEC_GROUP *group = NULL;\n");
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BIO_printf(out, "\tEC_POINT *point = NULL;\n");
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BIO_printf(out, "\tBIGNUM *tmp_1 = NULL, *tmp_2 = NULL, "
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"*tmp_3 = NULL;\n\n");
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BIO_printf(out, "\tif ((tmp_1 = BN_bin2bn(ec_p_%d, "
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"sizeof(ec_p_%d), NULL)) == NULL)\n\t\t"
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"goto err;\n", len, len);
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BIO_printf(out, "\tif ((tmp_2 = BN_bin2bn(ec_a_%d, "
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"sizeof(ec_a_%d), NULL)) == NULL)\n\t\t"
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"goto err;\n", len, len);
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BIO_printf(out, "\tif ((tmp_3 = BN_bin2bn(ec_b_%d, "
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"sizeof(ec_b_%d), NULL)) == NULL)\n\t\t"
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"goto err;\n", len, len);
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if (is_prime) {
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BIO_printf(out, "\tif ((group = EC_GROUP_new_curve_"
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"GFp(tmp_1, tmp_2, tmp_3, NULL)) == NULL)"
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"\n\t\tgoto err;\n\n");
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} else {
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BIO_printf(out, "\tif ((group = EC_GROUP_new_curve_"
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"GF2m(tmp_1, tmp_2, tmp_3, NULL)) == NULL)"
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"\n\t\tgoto err;\n\n");
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}
|
|
BIO_printf(out, "\t/* build generator */\n");
|
|
BIO_printf(out, "\tif ((tmp_1 = BN_bin2bn(ec_gen_%d, "
|
|
"sizeof(ec_gen_%d), tmp_1)) == NULL)"
|
|
"\n\t\tgoto err;\n", len, len);
|
|
BIO_printf(out, "\tpoint = EC_POINT_bn2point(group, tmp_1, "
|
|
"NULL, NULL);\n");
|
|
BIO_printf(out, "\tif (point == NULL)\n\t\tgoto err;\n");
|
|
BIO_printf(out, "\tif ((tmp_2 = BN_bin2bn(ec_order_%d, "
|
|
"sizeof(ec_order_%d), tmp_2)) == NULL)"
|
|
"\n\t\tgoto err;\n", len, len);
|
|
BIO_printf(out, "\tif ((tmp_3 = BN_bin2bn(ec_cofactor_%d, "
|
|
"sizeof(ec_cofactor_%d), tmp_3)) == NULL)"
|
|
"\n\t\tgoto err;\n", len, len);
|
|
BIO_printf(out, "\tif (!EC_GROUP_set_generator(group, point,"
|
|
" tmp_2, tmp_3))\n\t\tgoto err;\n");
|
|
BIO_printf(out, "\n\tok=1;\n");
|
|
BIO_printf(out, "err:\n");
|
|
BIO_printf(out, "\tif (tmp_1)\n\t\tBN_free(tmp_1);\n");
|
|
BIO_printf(out, "\tif (tmp_2)\n\t\tBN_free(tmp_2);\n");
|
|
BIO_printf(out, "\tif (tmp_3)\n\t\tBN_free(tmp_3);\n");
|
|
BIO_printf(out, "\tif (point)\n\t\tEC_POINT_free(point);\n");
|
|
BIO_printf(out, "\tif (!ok)\n");
|
|
BIO_printf(out, "\t\t{\n");
|
|
BIO_printf(out, "\t\tEC_GROUP_free(group);\n");
|
|
BIO_printf(out, "\t\tgroup = NULL;\n");
|
|
BIO_printf(out, "\t\t}\n");
|
|
BIO_printf(out, "\treturn(group);\n\t}\n");
|
|
}
|
|
if (!cfg.noout) {
|
|
if (cfg.outformat == FORMAT_ASN1)
|
|
i = i2d_ECPKParameters_bio(out, group);
|
|
else if (cfg.outformat == FORMAT_PEM)
|
|
i = PEM_write_bio_ECPKParameters(out, group);
|
|
else {
|
|
BIO_printf(bio_err, "bad output format specified for"
|
|
" outfile\n");
|
|
goto end;
|
|
}
|
|
if (!i) {
|
|
BIO_printf(bio_err, "unable to write elliptic "
|
|
"curve parameters\n");
|
|
ERR_print_errors(bio_err);
|
|
goto end;
|
|
}
|
|
}
|
|
if (cfg.genkey) {
|
|
EC_KEY *eckey = EC_KEY_new();
|
|
|
|
if (eckey == NULL)
|
|
goto end;
|
|
|
|
if (EC_KEY_set_group(eckey, group) == 0) {
|
|
EC_KEY_free(eckey);
|
|
goto end;
|
|
}
|
|
|
|
if (!EC_KEY_generate_key(eckey)) {
|
|
EC_KEY_free(eckey);
|
|
goto end;
|
|
}
|
|
if (cfg.outformat == FORMAT_ASN1)
|
|
i = i2d_ECPrivateKey_bio(out, eckey);
|
|
else if (cfg.outformat == FORMAT_PEM)
|
|
i = PEM_write_bio_ECPrivateKey(out, eckey, NULL,
|
|
NULL, 0, NULL, NULL);
|
|
else {
|
|
BIO_printf(bio_err, "bad output format specified "
|
|
"for outfile\n");
|
|
EC_KEY_free(eckey);
|
|
goto end;
|
|
}
|
|
EC_KEY_free(eckey);
|
|
}
|
|
ret = 0;
|
|
|
|
end:
|
|
BN_free(ec_p);
|
|
BN_free(ec_a);
|
|
BN_free(ec_b);
|
|
BN_free(ec_gen);
|
|
BN_free(ec_order);
|
|
BN_free(ec_cofactor);
|
|
|
|
free(buffer);
|
|
|
|
BIO_free(in);
|
|
BIO_free_all(out);
|
|
EC_GROUP_free(group);
|
|
|
|
return (ret);
|
|
}
|
|
|
|
static int
|
|
ecparam_print_var(BIO * out, BIGNUM * in, const char *var,
|
|
int len, unsigned char *buffer)
|
|
{
|
|
BIO_printf(out, "static unsigned char %s_%d[] = {", var, len);
|
|
if (BN_is_zero(in))
|
|
BIO_printf(out, "\n\t0x00");
|
|
else {
|
|
int i, l;
|
|
|
|
l = BN_bn2bin(in, buffer);
|
|
for (i = 0; i < l - 1; i++) {
|
|
if ((i % 12) == 0)
|
|
BIO_printf(out, "\n\t");
|
|
BIO_printf(out, "0x%02X,", buffer[i]);
|
|
}
|
|
if ((i % 12) == 0)
|
|
BIO_printf(out, "\n\t");
|
|
BIO_printf(out, "0x%02X", buffer[i]);
|
|
}
|
|
BIO_printf(out, "\n\t};\n\n");
|
|
return 1;
|
|
}
|
|
#endif
|