/* $OpenBSD: gendsa.c,v 1.31 2014/07/25 06:05:32 doug 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_DSA */


#include <sys/types.h>
#include <sys/stat.h>

#include <stdio.h>
#include <string.h>

#include "apps.h"

#include <openssl/bio.h>
#include <openssl/bn.h>
#include <openssl/dsa.h>
#include <openssl/err.h>
#include <openssl/pem.h>
#include <openssl/x509.h>

#define DEFBITS	512

int gendsa_main(int, char **);

int
gendsa_main(int argc, char **argv)
{
	DSA *dsa = NULL;
	int ret = 1;
	char *outfile = NULL;
	char *dsaparams = NULL;
	char *passargout = NULL, *passout = NULL;
	BIO *out = NULL, *in = NULL;
	const EVP_CIPHER *enc = NULL;
#ifndef OPENSSL_NO_ENGINE
	char *engine = NULL;
#endif

	argv++;
	argc--;
	for (;;) {
		if (argc <= 0)
			break;
		if (strcmp(*argv, "-out") == 0) {
			if (--argc < 1)
				goto bad;
			outfile = *(++argv);
		} else if (strcmp(*argv, "-passout") == 0) {
			if (--argc < 1)
				goto bad;
			passargout = *(++argv);
		}
#ifndef OPENSSL_NO_ENGINE
		else if (strcmp(*argv, "-engine") == 0) {
			if (--argc < 1)
				goto bad;
			engine = *(++argv);
		}
#endif
		else if (strcmp(*argv, "-") == 0)
			goto bad;
#ifndef OPENSSL_NO_DES
		else if (strcmp(*argv, "-des") == 0)
			enc = EVP_des_cbc();
		else if (strcmp(*argv, "-des3") == 0)
			enc = EVP_des_ede3_cbc();
#endif
#ifndef OPENSSL_NO_IDEA
		else if (strcmp(*argv, "-idea") == 0)
			enc = EVP_idea_cbc();
#endif
#ifndef OPENSSL_NO_AES
		else if (strcmp(*argv, "-aes128") == 0)
			enc = EVP_aes_128_cbc();
		else if (strcmp(*argv, "-aes192") == 0)
			enc = EVP_aes_192_cbc();
		else if (strcmp(*argv, "-aes256") == 0)
			enc = EVP_aes_256_cbc();
#endif
#ifndef OPENSSL_NO_CAMELLIA
		else if (strcmp(*argv, "-camellia128") == 0)
			enc = EVP_camellia_128_cbc();
		else if (strcmp(*argv, "-camellia192") == 0)
			enc = EVP_camellia_192_cbc();
		else if (strcmp(*argv, "-camellia256") == 0)
			enc = EVP_camellia_256_cbc();
#endif
		else if (**argv != '-' && dsaparams == NULL) {
			dsaparams = *argv;
		} else
			goto bad;
		argv++;
		argc--;
	}

	if (dsaparams == NULL) {
bad:
		BIO_printf(bio_err, "usage: gendsa [args] dsaparam-file\n");
		BIO_printf(bio_err, " -out file - output the key to 'file'\n");
#ifndef OPENSSL_NO_DES
		BIO_printf(bio_err, " -des      - encrypt the generated key with DES in cbc mode\n");
		BIO_printf(bio_err, " -des3     - encrypt the generated key with DES in ede cbc mode (168 bit key)\n");
#endif
#ifndef OPENSSL_NO_IDEA
		BIO_printf(bio_err, " -idea     - encrypt the generated key with IDEA in cbc mode\n");
#endif
#ifndef OPENSSL_NO_AES
		BIO_printf(bio_err, " -aes128, -aes192, -aes256\n");
		BIO_printf(bio_err, "                 encrypt PEM output with cbc aes\n");
#endif
#ifndef OPENSSL_NO_CAMELLIA
		BIO_printf(bio_err, " -camellia128, -camellia192, -camellia256\n");
		BIO_printf(bio_err, "                 encrypt PEM output with cbc camellia\n");
#endif
#ifndef OPENSSL_NO_ENGINE
		BIO_printf(bio_err, " -engine e - use engine e, possibly a hardware device.\n");
#endif
		BIO_printf(bio_err, " dsaparam-file\n");
		BIO_printf(bio_err, "           - a DSA parameter file as generated by the dsaparam command\n");
		goto end;
	}
#ifndef OPENSSL_NO_ENGINE
	setup_engine(bio_err, engine, 0);
#endif

	if (!app_passwd(bio_err, NULL, passargout, NULL, &passout)) {
		BIO_printf(bio_err, "Error getting password\n");
		goto end;
	}
	in = BIO_new(BIO_s_file());
	if (!(BIO_read_filename(in, dsaparams))) {
		perror(dsaparams);
		goto end;
	}
	if ((dsa = PEM_read_bio_DSAparams(in, NULL, NULL, NULL)) == NULL) {
		BIO_printf(bio_err, "unable to load DSA parameter file\n");
		goto end;
	}
	BIO_free(in);
	in = NULL;

	out = BIO_new(BIO_s_file());
	if (out == NULL)
		goto end;

	if (outfile == NULL) {
		BIO_set_fp(out, stdout, BIO_NOCLOSE);
	} else {
		if (BIO_write_filename(out, outfile) <= 0) {
			perror(outfile);
			goto end;
		}
	}

	BIO_printf(bio_err, "Generating DSA key, %d bits\n",
	    BN_num_bits(dsa->p));
	if (!DSA_generate_key(dsa))
		goto end;

	if (!PEM_write_bio_DSAPrivateKey(out, dsa, enc, NULL, 0, NULL, passout))
		goto end;
	ret = 0;
end:
	if (ret != 0)
		ERR_print_errors(bio_err);
	BIO_free(in);
	if (out != NULL)
		BIO_free_all(out);
	if (dsa != NULL)
		DSA_free(dsa);
	free(passout);

	return (ret);
}
