/* rsa_null.c */

/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL

 * project 1999.

 */

/* ====================================================================

 * Copyright (c) 1999 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

 *    licensing@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 "cryptlib.h"

#include <openssl/bn.h>

#include <openssl/rsa.h>

#include <openssl/rand.h>

/* This is a dummy RSA implementation that just returns errors when called.

 * It is designed to allow some RSA functions to work while stopping those

 * covered by the RSA patent. That is RSA, encryption, decryption, signing

 * and verify is not allowed but RSA key generation, key checking and other

 * operations (like storing RSA keys) are permitted.

 */

static int RSA_null_public_encrypt(int flen, const unsigned char *from,

		unsigned char *to, RSA *rsa,int padding);

static int RSA_null_private_encrypt(int flen, const unsigned char *from,

		unsigned char *to, RSA *rsa,int padding);

static int RSA_null_public_decrypt(int flen, const unsigned char *from,

		unsigned char *to, RSA *rsa,int padding);

static int RSA_null_private_decrypt(int flen, const unsigned char *from,

		unsigned char *to, RSA *rsa,int padding);

#if 0 /* not currently used */

static int RSA_null_mod_exp(const BIGNUM *r0, const BIGNUM *i, RSA *rsa);

#endif

static int RSA_null_init(RSA *rsa);

static int RSA_null_finish(RSA *rsa);

static RSA_METHOD rsa_null_meth={

	"Null RSA",

	RSA_null_public_encrypt,

	RSA_null_public_decrypt,

	RSA_null_private_encrypt,

	RSA_null_private_decrypt,

	NULL,

	NULL,

	RSA_null_init,

	RSA_null_finish,

	0,

	NULL,

	NULL,

	NULL,

	NULL

	};

EXPORT_C const RSA_METHOD *RSA_null_method(void)

	{

	return(&rsa_null_meth);

	}

static int RSA_null_public_encrypt(int flen, const unsigned char *from,

	     unsigned char *to, RSA *rsa, int padding)

	{

	RSAerr(RSA_F_RSA_NULL_PUBLIC_ENCRYPT, RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);

	return -1;

	}

static int RSA_null_private_encrypt(int flen, const unsigned char *from,

	     unsigned char *to, RSA *rsa, int padding)

	{

	RSAerr(RSA_F_RSA_NULL_PRIVATE_ENCRYPT, RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);

	return -1;

	}

static int RSA_null_private_decrypt(int flen, const unsigned char *from,

	     unsigned char *to, RSA *rsa, int padding)

	{

	RSAerr(RSA_F_RSA_NULL_PRIVATE_DECRYPT, RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);

	return -1;

	}

static int RSA_null_public_decrypt(int flen, const unsigned char *from,

	     unsigned char *to, RSA *rsa, int padding)

	{

	RSAerr(RSA_F_RSA_NULL_PUBLIC_DECRYPT, RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);

	return -1;

	}

#if 0 /* not currently used */

static int RSA_null_mod_exp(BIGNUM *r0, BIGNUM *I, RSA *rsa)

	{

	...err(RSA_F_RSA_NULL_MOD_EXP, RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);

	return -1;

	}

#endif

static int RSA_null_init(RSA *rsa)

	{

	return(1);

	}

static int RSA_null_finish(RSA *rsa)

	{

	return(1);

	}