Commit 4a61a64f authored by Dr. Stephen Henson's avatar Dr. Stephen Henson
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This is preliminary support for an "RSA null" cipher. Unfortunately when 

OpenSSL is compiled with NO_RSA, no RSA operations can be used: including
key generation storage and display of RSA keys. Since these operations are
not covered by the RSA patent (my understanding is it only covers encrypt,
decrypt, sign and verify) they can be included: this is an often requested
feature, attempts to use the patented operations return an error code.

This is enabled by setting RSA_NULL. This means that if a particular application
has its own legal US RSA implementation then it can use that instead by setting
it as the default RSA method.

Still experimental and needs some fiddling of the other libraries so they have
some options that don't attempt to use RSA if it isn't allowed.
parent 6882a964

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 Changes between 0.9.4 and 0.9.5  [xx XXX 1999]



  *) Preliminary compilation option RSA_NULL which disables RSA crypto without

     removing all other RSA functionality (this is what NO_RSA does). This

     is so (for example) those in the US can disable those operations covered

     by the RSA patent while allowing storage and parsing of RSA keys and RSA

     key generation.

     [Steve Henson]



  *) Non-copying interface to BIO pairs.

     (still totally untested)

     [Bodo Moeller]

crypto/rsa/rsa_null.c

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/* 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

 * (null@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, unsigned char *from,

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

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

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

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

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

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

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

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

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,

	};



RSA_METHOD *RSA_null_method(void)

	{

	return(&rsa_null_meth);

	}



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

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

	{

	RSAerr(RSA_F_RSA_NULL, RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);

	return -1;

	}



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

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

	{

	RSAerr(RSA_F_RSA_NULL, RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);

	return -1;

	}



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

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

	{

	RSAerr(RSA_F_RSA_NULL, RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);

	return -1;

	}



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

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

	{

	RSAerr(RSA_F_RSA_NULL, RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);

	return -1;

	}



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

	{

	RSAerr(RSA_F_RSA_NULL, RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);

	return -1;

	}



static int RSA_null_init(RSA *rsa)

	{

	return(1);

	}



static int RSA_null_finish(RSA *rsa)

	{

	return(1);

	}