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|
/* $OpenBSD: dhparam.c,v 1.13 2021/11/20 18:10:48 tb Exp $ */
/* 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.]
*/
/* ====================================================================
* Copyright (c) 1998-2000 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/opensslconf.h> /* for OPENSSL_NO_DH */
#ifndef OPENSSL_NO_DH
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "apps.h"
#include <openssl/bio.h>
#include <openssl/bn.h>
#include <openssl/err.h>
#include <openssl/dh.h>
#include <openssl/pem.h>
#include <openssl/x509.h>
#include <openssl/dsa.h>
#define DEFBITS 2048
struct {
int C;
int check;
int dsaparam;
int g;
char *infile;
int informat;
int noout;
char *outfile;
int outformat;
int text;
} dhparam_config;
static const struct option dhparam_options[] = {
{
.name = "2",
.desc = "Generate DH parameters with a generator value of 2 "
"(default)",
.type = OPTION_VALUE,
.opt.value = &dhparam_config.g,
.value = 2,
},
{
.name = "5",
.desc = "Generate DH parameters with a generator value of 5",
.type = OPTION_VALUE,
.opt.value = &dhparam_config.g,
.value = 5,
},
{
.name = "C",
.desc = "Convert DH parameters into C code",
.type = OPTION_FLAG,
.opt.flag = &dhparam_config.C,
},
{
.name = "check",
.desc = "Check the DH parameters",
.type = OPTION_FLAG,
.opt.flag = &dhparam_config.check,
},
{
.name = "dsaparam",
.desc = "Read or generate DSA parameters and convert to DH",
.type = OPTION_FLAG,
.opt.flag = &dhparam_config.dsaparam,
},
{
.name = "in",
.argname = "file",
.desc = "Input file (default stdin)",
.type = OPTION_ARG,
.opt.arg = &dhparam_config.infile,
},
{
.name = "inform",
.argname = "format",
.desc = "Input format (DER or PEM (default))",
.type = OPTION_ARG_FORMAT,
.opt.value = &dhparam_config.informat,
},
{
.name = "noout",
.desc = "Do not output encoded version of DH parameters",
.type = OPTION_FLAG,
.opt.flag = &dhparam_config.noout,
},
{
.name = "out",
.argname = "file",
.desc = "Output file (default stdout)",
.type = OPTION_ARG,
.opt.arg = &dhparam_config.outfile,
},
{
.name = "outform",
.argname = "format",
.desc = "Output format (DER or PEM (default))",
.type = OPTION_ARG_FORMAT,
.opt.value = &dhparam_config.outformat,
},
{
.name = "text",
.desc = "Print DH parameters in plain text",
.type = OPTION_FLAG,
.opt.flag = &dhparam_config.text,
},
{ NULL },
};
static void
dhparam_usage()
{
fprintf(stderr,
"usage: dhparam [-2 | -5] [-C] [-check] [-dsaparam]\n"
" [-in file] [-inform DER | PEM] [-noout] [-out file]\n"
" [-outform DER | PEM] [-text] [numbits]\n\n");
options_usage(dhparam_options);
}
static int dh_cb(int p, int n, BN_GENCB *cb);
int
dhparam_main(int argc, char **argv)
{
BIO *in = NULL, *out = NULL;
BN_GENCB *cb = NULL;
char *num_bits = NULL;
DH *dh = NULL;
int num = 0;
int ret = 1;
int i;
if (single_execution) {
if (pledge("stdio cpath wpath rpath", NULL) == -1) {
perror("pledge");
exit(1);
}
}
memset(&dhparam_config, 0, sizeof(dhparam_config));
dhparam_config.informat = FORMAT_PEM;
dhparam_config.outformat = FORMAT_PEM;
if (options_parse(argc, argv, dhparam_options, &num_bits, NULL) != 0) {
dhparam_usage();
return (1);
}
if (num_bits != NULL) {
if(sscanf(num_bits, "%d", &num) == 0 || num <= 0) {
BIO_printf(bio_err, "invalid number of bits: %s\n",
num_bits);
return (1);
}
}
if (dhparam_config.g && !num)
num = DEFBITS;
if (dhparam_config.dsaparam) {
if (dhparam_config.g) {
BIO_printf(bio_err, "generator may not be chosen for DSA parameters\n");
goto end;
}
} else {
/* DH parameters */
if (num && !dhparam_config.g)
dhparam_config.g = 2;
}
if (num) {
if ((cb = BN_GENCB_new()) == NULL) {
BIO_printf(bio_err,
"Error allocating BN_GENCB object\n");
goto end;
}
BN_GENCB_set(cb, dh_cb, bio_err);
if (dhparam_config.dsaparam) {
DSA *dsa = DSA_new();
BIO_printf(bio_err, "Generating DSA parameters, %d bit long prime\n", num);
if (!dsa || !DSA_generate_parameters_ex(dsa, num,
NULL, 0, NULL, NULL, cb)) {
DSA_free(dsa);
ERR_print_errors(bio_err);
goto end;
}
dh = DSA_dup_DH(dsa);
DSA_free(dsa);
if (dh == NULL) {
ERR_print_errors(bio_err);
goto end;
}
} else {
dh = DH_new();
BIO_printf(bio_err, "Generating DH parameters, %d bit long safe prime, generator %d\n", num, dhparam_config.g);
BIO_printf(bio_err, "This is going to take a long time\n");
if (!dh || !DH_generate_parameters_ex(dh, num, dhparam_config.g, cb)) {
ERR_print_errors(bio_err);
goto end;
}
}
} else {
in = BIO_new(BIO_s_file());
if (in == NULL) {
ERR_print_errors(bio_err);
goto end;
}
if (dhparam_config.infile == NULL)
BIO_set_fp(in, stdin, BIO_NOCLOSE);
else {
if (BIO_read_filename(in, dhparam_config.infile) <= 0) {
perror(dhparam_config.infile);
goto end;
}
}
if (dhparam_config.informat != FORMAT_ASN1 &&
dhparam_config.informat != FORMAT_PEM) {
BIO_printf(bio_err, "bad input format specified\n");
goto end;
}
if (dhparam_config.dsaparam) {
DSA *dsa;
if (dhparam_config.informat == FORMAT_ASN1)
dsa = d2i_DSAparams_bio(in, NULL);
else /* informat == FORMAT_PEM */
dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL);
if (dsa == NULL) {
BIO_printf(bio_err, "unable to load DSA parameters\n");
ERR_print_errors(bio_err);
goto end;
}
dh = DSA_dup_DH(dsa);
DSA_free(dsa);
if (dh == NULL) {
ERR_print_errors(bio_err);
goto end;
}
} else
{
if (dhparam_config.informat == FORMAT_ASN1)
dh = d2i_DHparams_bio(in, NULL);
else /* informat == FORMAT_PEM */
dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
if (dh == NULL) {
BIO_printf(bio_err, "unable to load DH parameters\n");
ERR_print_errors(bio_err);
goto end;
}
}
/* dh != NULL */
}
out = BIO_new(BIO_s_file());
if (out == NULL) {
ERR_print_errors(bio_err);
goto end;
}
if (dhparam_config.outfile == NULL) {
BIO_set_fp(out, stdout, BIO_NOCLOSE);
} else {
if (BIO_write_filename(out, dhparam_config.outfile) <= 0) {
perror(dhparam_config.outfile);
goto end;
}
}
if (dhparam_config.text) {
DHparams_print(out, dh);
}
if (dhparam_config.check) {
if (!DH_check(dh, &i)) {
ERR_print_errors(bio_err);
goto end;
}
if (i & DH_CHECK_P_NOT_PRIME)
printf("p value is not prime\n");
if (i & DH_CHECK_P_NOT_SAFE_PRIME)
printf("p value is not a safe prime\n");
if (i & DH_UNABLE_TO_CHECK_GENERATOR)
printf("unable to check the generator value\n");
if (i & DH_NOT_SUITABLE_GENERATOR)
printf("the g value is not a generator\n");
if (i == 0)
printf("DH parameters appear to be ok.\n");
}
if (dhparam_config.C) {
unsigned char *data;
int len, l, bits;
len = BN_num_bytes(dh->p);
bits = BN_num_bits(dh->p);
data = malloc(len);
if (data == NULL) {
perror("malloc");
goto end;
}
printf("#ifndef HEADER_DH_H\n"
"#include <openssl/dh.h>\n"
"#endif\n");
printf("DH *get_dh%d()\n\t{\n", bits);
l = BN_bn2bin(dh->p, data);
printf("\tstatic unsigned char dh%d_p[] = {", bits);
for (i = 0; i < l; i++) {
if ((i % 12) == 0)
printf("\n\t\t");
printf("0x%02X, ", data[i]);
}
printf("\n\t\t};\n");
l = BN_bn2bin(dh->g, data);
printf("\tstatic unsigned char dh%d_g[] = {", bits);
for (i = 0; i < l; i++) {
if ((i % 12) == 0)
printf("\n\t\t");
printf("0x%02X, ", data[i]);
}
printf("\n\t\t};\n");
printf("\tDH *dh;\n\n");
printf("\tif ((dh = DH_new()) == NULL) return(NULL);\n");
printf("\tdh->p = BN_bin2bn(dh%d_p, sizeof(dh%d_p), NULL);\n",
bits, bits);
printf("\tdh->g = BN_bin2bn(dh%d_g, sizeof(dh%d_g), NULL);\n",
bits, bits);
printf("\tif ((dh->p == NULL) || (dh->g == NULL))\n");
printf("\t\t{ DH_free(dh); return(NULL); }\n");
if (dh->length)
printf("\tdh->length = %ld;\n", dh->length);
printf("\treturn(dh);\n\t}\n");
free(data);
}
if (!dhparam_config.noout) {
if (dhparam_config.outformat == FORMAT_ASN1)
i = i2d_DHparams_bio(out, dh);
else if (dhparam_config.outformat == FORMAT_PEM)
i = PEM_write_bio_DHparams(out, dh);
else {
BIO_printf(bio_err, "bad output format specified for outfile\n");
goto end;
}
if (!i) {
BIO_printf(bio_err, "unable to write DH parameters\n");
ERR_print_errors(bio_err);
goto end;
}
}
ret = 0;
end:
BIO_free(in);
BIO_free_all(out);
BN_GENCB_free(cb);
DH_free(dh);
return (ret);
}
/* dh_cb is identical to dsa_cb in apps/dsaparam.c */
static int
dh_cb(int p, int n, BN_GENCB *cb)
{
char c = '*';
if (p == 0)
c = '.';
if (p == 1)
c = '+';
if (p == 2)
c = '*';
if (p == 3)
c = '\n';
BIO_write(BN_GENCB_get_arg(cb), &c, 1);
(void) BIO_flush(BN_GENCB_get_arg(cb));
return 1;
}
#endif
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