/*	$OpenBSD: dsatest.c,v 1.7 2022/01/12 08:59:56 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.]
 */

/* Until the key-gen callbacks are modified to use newer prototypes, we allow
 * deprecated functions for openssl-internal code */
#ifdef OPENSSL_NO_DEPRECATED
#undef OPENSSL_NO_DEPRECATED
#endif

#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>

#include <openssl/crypto.h>
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/bn.h>

#include <openssl/dsa.h>

static int dsa_cb(int p, int n, BN_GENCB *arg);

/* seed, out_p, out_q, out_g are taken from the updated Appendix 5 to
 * FIPS PUB 186 and also appear in Appendix 5 to FIPS PIB 186-1 */
static unsigned char seed[20] = {
	0xd5, 0x01, 0x4e, 0x4b, 0x60, 0xef, 0x2b, 0xa8, 0xb6, 0x21, 0x1b, 0x40,
	0x62, 0xba, 0x32, 0x24, 0xe0, 0x42, 0x7d, 0xd3,
};

static unsigned char out_p[] = {
	0x8d, 0xf2, 0xa4, 0x94, 0x49, 0x22, 0x76, 0xaa,
	0x3d, 0x25, 0x75, 0x9b, 0xb0, 0x68, 0x69, 0xcb,
	0xea, 0xc0, 0xd8, 0x3a, 0xfb, 0x8d, 0x0c, 0xf7,
	0xcb, 0xb8, 0x32, 0x4f, 0x0d, 0x78, 0x82, 0xe5,
	0xd0, 0x76, 0x2f, 0xc5, 0xb7, 0x21, 0x0e, 0xaf,
	0xc2, 0xe9, 0xad, 0xac, 0x32, 0xab, 0x7a, 0xac,
	0x49, 0x69, 0x3d, 0xfb, 0xf8, 0x37, 0x24, 0xc2,
	0xec, 0x07, 0x36, 0xee, 0x31, 0xc8, 0x02, 0x91,
};

static unsigned char out_q[] = {
	0xc7, 0x73, 0x21, 0x8c, 0x73, 0x7e, 0xc8, 0xee,
	0x99, 0x3b, 0x4f, 0x2d, 0xed, 0x30, 0xf4, 0x8e,
	0xda, 0xce, 0x91, 0x5f,
};

static unsigned char out_g[] = {
	0x62, 0x6d, 0x02, 0x78, 0x39, 0xea, 0x0a, 0x13,
	0x41, 0x31, 0x63, 0xa5, 0x5b, 0x4c, 0xb5, 0x00,
	0x29, 0x9d, 0x55, 0x22, 0x95, 0x6c, 0xef, 0xcb,
	0x3b, 0xff, 0x10, 0xf3, 0x99, 0xce, 0x2c, 0x2e,
	0x71, 0xcb, 0x9d, 0xe5, 0xfa, 0x24, 0xba, 0xbf,
	0x58, 0xe5, 0xb7, 0x95, 0x21, 0x92, 0x5c, 0x9c,
	0xc4, 0x2e, 0x9f, 0x6f, 0x46, 0x4b, 0x08, 0x8c,
	0xc5, 0x72, 0xaf, 0x53, 0xe6, 0xd7, 0x88, 0x02,
};

static const unsigned char str1[] = "12345678901234567890";

static BIO *bio_err = NULL;

int
main(int argc, char **argv)
{
	BN_GENCB *cb;
	DSA *dsa = NULL;
	int counter, i, j;
	unsigned char buf[256];
	unsigned long h;
	unsigned char sig[256];
	unsigned int siglen;
	int ret = 0;

	if (bio_err == NULL)
		bio_err = BIO_new_fp(stderr, BIO_NOCLOSE);

	ERR_load_crypto_strings();

	BIO_printf(bio_err, "test generation of DSA parameters\n");

	if ((cb = BN_GENCB_new()) == NULL)
		goto end;

	BN_GENCB_set(cb, dsa_cb, bio_err);
	if ((dsa = DSA_new()) == NULL)
		goto end;

	if (!DSA_generate_parameters_ex(dsa, 512, seed, 20, &counter, &h, cb))
		goto end;

	BIO_printf(bio_err, "seed\n");
	for (i = 0; i < 20; i += 4) {
		BIO_printf(bio_err, "%02X%02X%02X%02X ",
			seed[i], seed[i + 1], seed[i + 2], seed[i + 3]);
	}
	BIO_printf(bio_err, "\ncounter=%d h=%ld\n", counter, h);

	DSA_print(bio_err, dsa, 0);
	if (counter != 105) {
		BIO_printf(bio_err, "counter should be 105\n");
		goto end;
	}
	if (h != 2) {
		BIO_printf(bio_err, "h should be 2\n");
		goto end;
	}

	i = BN_bn2bin(DSA_get0_q(dsa), buf);
	j = sizeof(out_q);
	if ((i != j) || (memcmp(buf, out_q, i) != 0)) {
		BIO_printf(bio_err, "q value is wrong\n");
		goto end;
	}

	i = BN_bn2bin(DSA_get0_p(dsa), buf);
	j = sizeof(out_p);
	if ((i != j) || (memcmp(buf, out_p, i) != 0)) {
		BIO_printf(bio_err, "p value is wrong\n");
		goto end;
	}

	i = BN_bn2bin(DSA_get0_g(dsa), buf);
	j = sizeof(out_g);
	if ((i != j) || (memcmp(buf, out_g, i) != 0)) {
		BIO_printf(bio_err, "g value is wrong\n");
		goto end;
	}

	DSA_generate_key(dsa);
	DSA_sign(0, str1, 20, sig, &siglen, dsa);
	if (DSA_verify(0, str1, 20, sig, siglen, dsa) == 1)
		ret = 1;

end:
	BN_GENCB_free(cb);
	if (!ret)
		ERR_print_errors(bio_err);
	DSA_free(dsa);
	CRYPTO_cleanup_all_ex_data();
	ERR_remove_thread_state(NULL);
	ERR_free_strings();
	CRYPTO_mem_leaks(bio_err);
	BIO_free(bio_err);
	bio_err = NULL;

	return !ret;
}

static int
dsa_cb(int p, int n, BN_GENCB *arg)
{
	char c = '*';
	static int ok = 0, num = 0;

	if (p == 0) {
		c = '.';
		num++;
	}
	if (p == 1)
		c = '+';
	if (p == 2) {
		c = '*';
		ok++;
	}

	if (p == 3)
		c = '\n';
	BIO_write(BN_GENCB_get_arg(arg), &c, 1);
	(void)BIO_flush(BN_GENCB_get_arg(arg));

	if (!ok && (p == 0) && (num > 1)) {
		BIO_printf((BIO *)arg, "error in dsatest\n");
		return 0;
	}
	return 1;
}
