path: root/usr.bin/openssl/dh.c

/* $OpenBSD: dh.c,v 1.1 2014/08/26 17:47:24 jsing 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.]
 */

#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>

/* -inform arg	- input format - default PEM (DER or PEM)
 * -outform arg - output format - default PEM
 * -in arg	- input file - default stdin
 * -out arg	- output file - default stdout
 * -check	- check the parameters are ok
 * -noout
 * -text
 * -C
 */

int dh_main(int, char **);

int
dh_main(int argc, char **argv)
{
	DH *dh = NULL;
	int i, badops = 0, text = 0;
	BIO *in = NULL, *out = NULL;
	int informat, outformat, check = 0, noout = 0, C = 0, ret = 1;
	char *infile, *outfile, *prog;
#ifndef OPENSSL_NO_ENGINE
	char *engine;
#endif

#ifndef OPENSSL_NO_ENGINE
	engine = NULL;
#endif
	infile = NULL;
	outfile = NULL;
	informat = FORMAT_PEM;
	outformat = FORMAT_PEM;

	prog = argv[0];
	argc--;
	argv++;
	while (argc >= 1) {
		if (strcmp(*argv, "-inform") == 0) {
			if (--argc < 1)
				goto bad;
			informat = str2fmt(*(++argv));
		} else if (strcmp(*argv, "-outform") == 0) {
			if (--argc < 1)
				goto bad;
			outformat = str2fmt(*(++argv));
		} else if (strcmp(*argv, "-in") == 0) {
			if (--argc < 1)
				goto bad;
			infile = *(++argv);
		} else if (strcmp(*argv, "-out") == 0) {
			if (--argc < 1)
				goto bad;
			outfile = *(++argv);
		}
#ifndef OPENSSL_NO_ENGINE
		else if (strcmp(*argv, "-engine") == 0) {
			if (--argc < 1)
				goto bad;
			engine = *(++argv);
		}
#endif
		else if (strcmp(*argv, "-check") == 0)
			check = 1;
		else if (strcmp(*argv, "-text") == 0)
			text = 1;
		else if (strcmp(*argv, "-C") == 0)
			C = 1;
		else if (strcmp(*argv, "-noout") == 0)
			noout = 1;
		else {
			BIO_printf(bio_err, "unknown option %s\n", *argv);
			badops = 1;
			break;
		}
		argc--;
		argv++;
	}

	if (badops) {
bad:
		BIO_printf(bio_err, "%s [options] <infile >outfile\n", prog);
		BIO_printf(bio_err, "where options are\n");
		BIO_printf(bio_err, " -inform arg   input format - one of DER PEM\n");
		BIO_printf(bio_err, " -outform arg  output format - one of DER PEM\n");
		BIO_printf(bio_err, " -in arg       input file\n");
		BIO_printf(bio_err, " -out arg      output file\n");
		BIO_printf(bio_err, " -check        check the DH parameters\n");
		BIO_printf(bio_err, " -text         print a text form of the DH parameters\n");
		BIO_printf(bio_err, " -C            Output C code\n");
		BIO_printf(bio_err, " -noout        no output\n");
#ifndef OPENSSL_NO_ENGINE
		BIO_printf(bio_err, " -engine e     use engine e, possibly a hardware device.\n");
#endif
		goto end;
	}
	ERR_load_crypto_strings();

#ifndef OPENSSL_NO_ENGINE
	setup_engine(bio_err, engine, 0);
#endif

	in = BIO_new(BIO_s_file());
	out = BIO_new(BIO_s_file());
	if ((in == NULL) || (out == NULL)) {
		ERR_print_errors(bio_err);
		goto end;
	}
	if (infile == NULL)
		BIO_set_fp(in, stdin, BIO_NOCLOSE);
	else {
		if (BIO_read_filename(in, infile) <= 0) {
			perror(infile);
			goto end;
		}
	}
	if (outfile == NULL) {
		BIO_set_fp(out, stdout, BIO_NOCLOSE);
	} else {
		if (BIO_write_filename(out, outfile) <= 0) {
			perror(outfile);
			goto end;
		}
	}

	if (informat == FORMAT_ASN1)
		dh = d2i_DHparams_bio(in, NULL);
	else if (informat == FORMAT_PEM)
		dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
	else {
		BIO_printf(bio_err, "bad input format specified\n");
		goto end;
	}
	if (dh == NULL) {
		BIO_printf(bio_err, "unable to load DH parameters\n");
		ERR_print_errors(bio_err);
		goto end;
	}
	if (text) {
		DHparams_print(out, dh);
#ifdef undef
		printf("p=");
		BN_print(stdout, dh->p);
		printf("\ng=");
		BN_print(stdout, dh->g);
		printf("\n");
		if (dh->length != 0)
			printf("recommended private length=%ld\n", dh->length);
#endif
	}
	if (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 (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;
		}
		l = BN_bn2bin(dh->p, data);
		printf("static unsigned char dh%d_p[] = {", bits);
		for (i = 0; i < l; i++) {
			if ((i % 12) == 0)
				printf("\n\t");
			printf("0x%02X, ", data[i]);
		}
		printf("\n\t};\n");

		l = BN_bn2bin(dh->g, data);
		printf("static unsigned char dh%d_g[] = {", bits);
		for (i = 0; i < l; i++) {
			if ((i % 12) == 0)
				printf("\n\t");
			printf("0x%02X, ", data[i]);
		}
		printf("\n\t};\n\n");

		printf("DH *get_dh%d()\n\t{\n", bits);
		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\treturn(NULL);\n");
		printf("\treturn(dh);\n\t}\n");
		free(data);
	}
	if (!noout) {
		if (outformat == FORMAT_ASN1)
			i = i2d_DHparams_bio(out, dh);
		else if (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);
	if (out != NULL)
		BIO_free_all(out);
	if (dh != NULL)
		DH_free(dh);

	return (ret);
}
#endif