/* 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);

 	}