/*	$OpenBSD: ecdhtest.c,v 1.13 2023/03/08 16:51:42 tb Exp $	*/
/* ====================================================================
 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 *
 * The Elliptic Curve Public-Key Crypto Library (ECC Code) included
 * herein is developed by SUN MICROSYSTEMS, INC., and is contributed
 * to the OpenSSL project.
 *
 * The ECC Code is licensed pursuant to the OpenSSL open source
 * license provided below.
 *
 * The ECDH software is originally written by Douglas Stebila of
 * Sun Microsystems Laboratories.
 *
 */
/* ====================================================================
 * Copyright (c) 1998-2003 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 <stdio.h>
#include <stdlib.h>
#include <string.h>

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

#include <openssl/ec.h>
#include <openssl/ecdh.h>

static const int KDF1_SHA1_len = 20;
static void *
KDF1_SHA1(const void *in, size_t inlen, void *out, size_t *outlen)
{
#ifndef OPENSSL_NO_SHA
	if (*outlen < SHA_DIGEST_LENGTH)
		return NULL;
	else
		*outlen = SHA_DIGEST_LENGTH;
	return SHA1(in, inlen, out);
#else
	return NULL;
#endif
}


static int
test_ecdh_curve(int nid, const char *text, BN_CTX *ctx, BIO *out)
{
	BIGNUM *x_a = NULL, *y_a = NULL, *x_b = NULL, *y_b = NULL;
	EC_KEY *a = NULL, *b = NULL;
	const EC_GROUP *group;
	unsigned char *abuf = NULL, *bbuf = NULL;
	int i, alen, blen, aout, bout, ret = 0;
	char buf[12];

	a = EC_KEY_new_by_curve_name(nid);
	b = EC_KEY_new_by_curve_name(nid);
	if (a == NULL || b == NULL)
		goto err;

	group = EC_KEY_get0_group(a);

	if ((x_a = BN_new()) == NULL)
		goto err;
	if ((y_a = BN_new()) == NULL)
		goto err;
	if ((x_b = BN_new()) == NULL)
		goto err;
	if ((y_b = BN_new()) == NULL)
		goto err;

	BIO_puts(out, "Testing key generation with ");
	BIO_puts(out, text);
	(void)BIO_flush(out);

	if (!EC_KEY_generate_key(a))
		goto err;

	if (!EC_POINT_get_affine_coordinates(group,
	    EC_KEY_get0_public_key(a), x_a, y_a, ctx)) goto err;

	BIO_printf(out, " .");
	(void)BIO_flush(out);

	if (!EC_KEY_generate_key(b))
		goto err;

	if (!EC_POINT_get_affine_coordinates(group,
	    EC_KEY_get0_public_key(b), x_b, y_b, ctx)) goto err;

	BIO_printf(out, ".");
	(void)BIO_flush(out);

	alen = KDF1_SHA1_len;
	abuf = malloc(alen);
	aout = ECDH_compute_key(abuf, alen, EC_KEY_get0_public_key(b),
	    a, KDF1_SHA1);

	BIO_printf(out, ".");
	(void)BIO_flush(out);

	blen = KDF1_SHA1_len;
	bbuf = malloc(blen);
	bout = ECDH_compute_key(bbuf, blen, EC_KEY_get0_public_key(a),
	    b, KDF1_SHA1);

	BIO_printf(out, ".");
	(void)BIO_flush(out);

	if ((aout < 4) || (bout != aout) || (memcmp(abuf, bbuf, aout) != 0)) {
		BIO_printf(out, " failed\n\n");
		BIO_printf(out, "key a:\n");
		BIO_printf(out, "private key: ");
		BN_print(out, EC_KEY_get0_private_key(a));
		BIO_printf(out, "\n");
		BIO_printf(out, "public key (x,y): ");
		BN_print(out, x_a);
		BIO_printf(out, ",");
		BN_print(out, y_a);
		BIO_printf(out, "\nkey b:\n");
		BIO_printf(out, "private key: ");
		BN_print(out, EC_KEY_get0_private_key(b));
		BIO_printf(out, "\n");
		BIO_printf(out, "public key (x,y): ");
		BN_print(out, x_b);
		BIO_printf(out, ",");
		BN_print(out, y_b);
		BIO_printf(out, "\n");
		BIO_printf(out, "generated key a: ");
		for (i = 0; i < bout; i++) {
			snprintf(buf, sizeof buf, "%02X", bbuf[i]);
			BIO_puts(out, buf);
		}
		BIO_printf(out, "\n");
		BIO_printf(out, "generated key b: ");
		for (i = 0; i < aout; i++) {
			snprintf(buf, sizeof buf, "%02X", abuf[i]);
			BIO_puts(out, buf);
		}
		BIO_printf(out, "\n");
		fprintf(stderr, "Error in ECDH routines\n");
		ret = 0;
	} else {
		BIO_printf(out, " ok\n");
		ret = 1;
	}

err:
	ERR_print_errors_fp(stderr);

	free(abuf);
	free(bbuf);
	BN_free(x_a);
	BN_free(y_a);
	BN_free(x_b);
	BN_free(y_b);
	EC_KEY_free(b);
	EC_KEY_free(a);

	return (ret);
}

/* Keys and shared secrets from RFC 7027 */

static const unsigned char bp256_da[] = {
	0x81, 0xDB, 0x1E, 0xE1, 0x00, 0x15, 0x0F, 0xF2, 0xEA, 0x33, 0x8D, 0x70,
	0x82, 0x71, 0xBE, 0x38, 0x30, 0x0C, 0xB5, 0x42, 0x41, 0xD7, 0x99, 0x50,
	0xF7, 0x7B, 0x06, 0x30, 0x39, 0x80, 0x4F, 0x1D
};

static const unsigned char bp256_db[] = {
	0x55, 0xE4, 0x0B, 0xC4, 0x1E, 0x37, 0xE3, 0xE2, 0xAD, 0x25, 0xC3, 0xC6,
	0x65, 0x45, 0x11, 0xFF, 0xA8, 0x47, 0x4A, 0x91, 0xA0, 0x03, 0x20, 0x87,
	0x59, 0x38, 0x52, 0xD3, 0xE7, 0xD7, 0x6B, 0xD3
};

static const unsigned char bp256_Z[] = {
	0x89, 0xAF, 0xC3, 0x9D, 0x41, 0xD3, 0xB3, 0x27, 0x81, 0x4B, 0x80, 0x94,
	0x0B, 0x04, 0x25, 0x90, 0xF9, 0x65, 0x56, 0xEC, 0x91, 0xE6, 0xAE, 0x79,
	0x39, 0xBC, 0xE3, 0x1F, 0x3A, 0x18, 0xBF, 0x2B
};

static const unsigned char bp384_da[] = {
	0x1E, 0x20, 0xF5, 0xE0, 0x48, 0xA5, 0x88, 0x6F, 0x1F, 0x15, 0x7C, 0x74,
	0xE9, 0x1B, 0xDE, 0x2B, 0x98, 0xC8, 0xB5, 0x2D, 0x58, 0xE5, 0x00, 0x3D,
	0x57, 0x05, 0x3F, 0xC4, 0xB0, 0xBD, 0x65, 0xD6, 0xF1, 0x5E, 0xB5, 0xD1,
	0xEE, 0x16, 0x10, 0xDF, 0x87, 0x07, 0x95, 0x14, 0x36, 0x27, 0xD0, 0x42
};

static const unsigned char bp384_db[] = {
	0x03, 0x26, 0x40, 0xBC, 0x60, 0x03, 0xC5, 0x92, 0x60, 0xF7, 0x25, 0x0C,
	0x3D, 0xB5, 0x8C, 0xE6, 0x47, 0xF9, 0x8E, 0x12, 0x60, 0xAC, 0xCE, 0x4A,
	0xCD, 0xA3, 0xDD, 0x86, 0x9F, 0x74, 0xE0, 0x1F, 0x8B, 0xA5, 0xE0, 0x32,
	0x43, 0x09, 0xDB, 0x6A, 0x98, 0x31, 0x49, 0x7A, 0xBA, 0xC9, 0x66, 0x70
};

static const unsigned char bp384_Z[] = {
	0x0B, 0xD9, 0xD3, 0xA7, 0xEA, 0x0B, 0x3D, 0x51, 0x9D, 0x09, 0xD8, 0xE4,
	0x8D, 0x07, 0x85, 0xFB, 0x74, 0x4A, 0x6B, 0x35, 0x5E, 0x63, 0x04, 0xBC,
	0x51, 0xC2, 0x29, 0xFB, 0xBC, 0xE2, 0x39, 0xBB, 0xAD, 0xF6, 0x40, 0x37,
	0x15, 0xC3, 0x5D, 0x4F, 0xB2, 0xA5, 0x44, 0x4F, 0x57, 0x5D, 0x4F, 0x42
};

static const unsigned char bp512_da[] = {
	0x16, 0x30, 0x2F, 0xF0, 0xDB, 0xBB, 0x5A, 0x8D, 0x73, 0x3D, 0xAB, 0x71,
	0x41, 0xC1, 0xB4, 0x5A, 0xCB, 0xC8, 0x71, 0x59, 0x39, 0x67, 0x7F, 0x6A,
	0x56, 0x85, 0x0A, 0x38, 0xBD, 0x87, 0xBD, 0x59, 0xB0, 0x9E, 0x80, 0x27,
	0x96, 0x09, 0xFF, 0x33, 0x3E, 0xB9, 0xD4, 0xC0, 0x61, 0x23, 0x1F, 0xB2,
	0x6F, 0x92, 0xEE, 0xB0, 0x49, 0x82, 0xA5, 0xF1, 0xD1, 0x76, 0x4C, 0xAD,
	0x57, 0x66, 0x54, 0x22
};

static const unsigned char bp512_db[] = {
	0x23, 0x0E, 0x18, 0xE1, 0xBC, 0xC8, 0x8A, 0x36, 0x2F, 0xA5, 0x4E, 0x4E,
	0xA3, 0x90, 0x20, 0x09, 0x29, 0x2F, 0x7F, 0x80, 0x33, 0x62, 0x4F, 0xD4,
	0x71, 0xB5, 0xD8, 0xAC, 0xE4, 0x9D, 0x12, 0xCF, 0xAB, 0xBC, 0x19, 0x96,
	0x3D, 0xAB, 0x8E, 0x2F, 0x1E, 0xBA, 0x00, 0xBF, 0xFB, 0x29, 0xE4, 0xD7,
	0x2D, 0x13, 0xF2, 0x22, 0x45, 0x62, 0xF4, 0x05, 0xCB, 0x80, 0x50, 0x36,
	0x66, 0xB2, 0x54, 0x29
};


static const unsigned char bp512_Z[] = {
	0xA7, 0x92, 0x70, 0x98, 0x65, 0x5F, 0x1F, 0x99, 0x76, 0xFA, 0x50, 0xA9,
	0xD5, 0x66, 0x86, 0x5D, 0xC5, 0x30, 0x33, 0x18, 0x46, 0x38, 0x1C, 0x87,
	0x25, 0x6B, 0xAF, 0x32, 0x26, 0x24, 0x4B, 0x76, 0xD3, 0x64, 0x03, 0xC0,
	0x24, 0xD7, 0xBB, 0xF0, 0xAA, 0x08, 0x03, 0xEA, 0xFF, 0x40, 0x5D, 0x3D,
	0x24, 0xF1, 0x1A, 0x9B, 0x5C, 0x0B, 0xEF, 0x67, 0x9F, 0xE1, 0x45, 0x4B,
	0x21, 0xC4, 0xCD, 0x1F
};

/* Given private value and NID, create EC_KEY structure */

static EC_KEY *
mk_eckey(int nid, const unsigned char *p, size_t plen)
{
	EC_KEY *k = NULL;
	BIGNUM *priv = NULL;
	EC_POINT *pub = NULL;
	const EC_GROUP *grp;
	int ok = 0;

	k = EC_KEY_new_by_curve_name(nid);
	if (!k)
		goto err;
	priv = BN_bin2bn(p, plen, NULL);
	if (!priv)
		goto err;
	if (!EC_KEY_set_private_key(k, priv))
		goto err;
	grp = EC_KEY_get0_group(k);
	pub = EC_POINT_new(grp);
	if (!pub)
		goto err;
	if (!EC_POINT_mul(grp, pub, priv, NULL, NULL, NULL))
		goto err;
	if (!EC_KEY_set_public_key(k, pub))
		goto err;
	ok = 1;
err:
	BN_free(priv);
	EC_POINT_free(pub);
	if (!ok) {
		EC_KEY_free(k);
		k = NULL;
	}
	return (k);
}

/* Known answer test: compute shared secret and check it matches
 * expected value.
 */

static int
ecdh_kat(BIO *out, const char *cname, int nid,
    const unsigned char *k1, size_t k1_len,
    const unsigned char *k2, size_t k2_len,
    const unsigned char *Z, size_t Zlen)
{
	int rv = 0;
	EC_KEY *key1 = NULL, *key2 = NULL;
	unsigned char *Ztmp = NULL;
	size_t Ztmplen;
	BIO_puts(out, "Testing ECDH shared secret with ");
	BIO_puts(out, cname);
	key1 = mk_eckey(nid, k1, k1_len);
	key2 = mk_eckey(nid, k2, k2_len);
	if (!key1 || !key2)
		goto err;
	Ztmplen = ECDH_size(key1);
	if (Ztmplen != Zlen)
		goto err;
	Ztmp = malloc(Ztmplen);
	if (!ECDH_compute_key(Ztmp, Ztmplen,
	    EC_KEY_get0_public_key(key2), key1, 0))
		goto err;
	if (memcmp(Ztmp, Z, Zlen))
		goto err;
	memset(Ztmp, 0, Zlen);
	if (!ECDH_compute_key(Ztmp, Ztmplen,
	    EC_KEY_get0_public_key(key1), key2, 0))
		goto err;
	if (memcmp(Ztmp, Z, Zlen))
		goto err;
	rv = 1;

err:
	if (rv)
		BIO_puts(out, " ok\n");
	else {
		fprintf(stderr, "Error in ECDH routines\n");
		ERR_print_errors_fp(stderr);
	}

	EC_KEY_free(key1);
	EC_KEY_free(key2);
	free(Ztmp);

	return rv;
}

#define test_ecdh_kat(bio, curve, bits) \
	ecdh_kat(bio, curve, NID_brainpoolP##bits##r1, \
		bp##bits##_da, sizeof(bp##bits##_da), \
		bp##bits##_db, sizeof(bp##bits##_db), \
		bp##bits##_Z, sizeof(bp##bits##_Z))

int
main(int argc, char *argv[])
{
	BN_CTX *ctx = NULL;
	int ret = 1;
	BIO *out;

	out = BIO_new(BIO_s_file());
	if (out == NULL)
		exit(1);
	BIO_set_fp(out, stdout, BIO_NOCLOSE);

	if ((ctx = BN_CTX_new()) == NULL)
		goto err;

	/* NIST PRIME CURVES TESTS */
	if (!test_ecdh_curve(NID_X9_62_prime192v1, "NIST Prime-Curve P-192",
	    ctx, out))
		goto err;
	if (!test_ecdh_curve(NID_secp224r1, "NIST Prime-Curve P-224", ctx, out))
		goto err;
	if (!test_ecdh_curve(NID_X9_62_prime256v1, "NIST Prime-Curve P-256",
	    ctx, out))
		goto err;
	if (!test_ecdh_curve(NID_secp384r1, "NIST Prime-Curve P-384", ctx, out))
		goto err;
	if (!test_ecdh_curve(NID_secp521r1, "NIST Prime-Curve P-521", ctx, out))
		goto err;
#ifndef OPENSSL_NO_EC2M
	/* NIST BINARY CURVES TESTS */
	if (!test_ecdh_curve(NID_sect163k1, "NIST Binary-Curve K-163",
	    ctx, out))
		goto err;
	if (!test_ecdh_curve(NID_sect163r2, "NIST Binary-Curve B-163",
	    ctx, out))
		goto err;
	if (!test_ecdh_curve(NID_sect233k1, "NIST Binary-Curve K-233",
	    ctx, out))
		goto err;
	if (!test_ecdh_curve(NID_sect233r1, "NIST Binary-Curve B-233",
	    ctx, out))
		goto err;
	if (!test_ecdh_curve(NID_sect283k1, "NIST Binary-Curve K-283",
	    ctx, out))
		goto err;
	if (!test_ecdh_curve(NID_sect283r1, "NIST Binary-Curve B-283",
	    ctx, out))
		goto err;
	if (!test_ecdh_curve(NID_sect409k1, "NIST Binary-Curve K-409",
	    ctx, out))
		goto err;
	if (!test_ecdh_curve(NID_sect409r1, "NIST Binary-Curve B-409",
	    ctx, out))
		goto err;
	if (!test_ecdh_curve(NID_sect571k1, "NIST Binary-Curve K-571",
	    ctx, out))
		goto err;
	if (!test_ecdh_curve(NID_sect571r1, "NIST Binary-Curve B-571",
	    ctx, out))
		goto err;
#endif
	if (!test_ecdh_kat(out, "Brainpool Prime-Curve brainpoolP256r1", 256))
		goto err;
	if (!test_ecdh_kat(out, "Brainpool Prime-Curve brainpoolP384r1", 384))
		goto err;
	if (!test_ecdh_kat(out, "Brainpool Prime-Curve brainpoolP512r1", 512))
		goto err;

	ret = 0;

err:
	ERR_print_errors_fp(stderr);
	BN_CTX_free(ctx);
	BIO_free(out);
	CRYPTO_cleanup_all_ex_data();
	ERR_remove_thread_state(NULL);
	CRYPTO_mem_leaks_fp(stderr);
	exit(ret);
}