1/* rsa_null.c */
2/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
3 * project 1999.
4 */
5/* ====================================================================
6 * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in
17 *    the documentation and/or other materials provided with the
18 *    distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 *    software must display the following acknowledgment:
22 *    "This product includes software developed by the OpenSSL Project
23 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 *    endorse or promote products derived from this software without
27 *    prior written permission. For written permission, please contact
28 *    licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 *    nor may "OpenSSL" appear in their names without prior written
32 *    permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 *    acknowledgment:
36 *    "This product includes software developed by the OpenSSL Project
37 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com).  This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58
59#include <stdio.h>
60#include "cryptlib.h"
61#include <openssl/bn.h>
62#include <openssl/rsa.h>
63#include <openssl/rand.h>
64
65/* This is a dummy RSA implementation that just returns errors when called.
66 * It is designed to allow some RSA functions to work while stopping those
67 * covered by the RSA patent. That is RSA, encryption, decryption, signing
68 * and verify is not allowed but RSA key generation, key checking and other
69 * operations (like storing RSA keys) are permitted.
70 */
71
72static int RSA_null_public_encrypt(int flen, const unsigned char *from,
73		unsigned char *to, RSA *rsa,int padding);
74static int RSA_null_private_encrypt(int flen, const unsigned char *from,
75		unsigned char *to, RSA *rsa,int padding);
76static int RSA_null_public_decrypt(int flen, const unsigned char *from,
77		unsigned char *to, RSA *rsa,int padding);
78static int RSA_null_private_decrypt(int flen, const unsigned char *from,
79		unsigned char *to, RSA *rsa,int padding);
80#if 0 /* not currently used */
81static int RSA_null_mod_exp(const BIGNUM *r0, const BIGNUM *i, RSA *rsa);
82#endif
83static int RSA_null_init(RSA *rsa);
84static int RSA_null_finish(RSA *rsa);
85static RSA_METHOD rsa_null_meth={
86	"Null RSA",
87	RSA_null_public_encrypt,
88	RSA_null_public_decrypt,
89	RSA_null_private_encrypt,
90	RSA_null_private_decrypt,
91	NULL,
92	NULL,
93	RSA_null_init,
94	RSA_null_finish,
95	0,
96	NULL,
97	};
98
99const RSA_METHOD *RSA_null_method(void)
100	{
101	return(&rsa_null_meth);
102	}
103
104static int RSA_null_public_encrypt(int flen, const unsigned char *from,
105	     unsigned char *to, RSA *rsa, int padding)
106	{
107	RSAerr(RSA_F_RSA_NULL, RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);
108	return -1;
109	}
110
111static int RSA_null_private_encrypt(int flen, const unsigned char *from,
112	     unsigned char *to, RSA *rsa, int padding)
113	{
114	RSAerr(RSA_F_RSA_NULL, RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);
115	return -1;
116	}
117
118static int RSA_null_private_decrypt(int flen, const unsigned char *from,
119	     unsigned char *to, RSA *rsa, int padding)
120	{
121	RSAerr(RSA_F_RSA_NULL, RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);
122	return -1;
123	}
124
125static int RSA_null_public_decrypt(int flen, const unsigned char *from,
126	     unsigned char *to, RSA *rsa, int padding)
127	{
128	RSAerr(RSA_F_RSA_NULL, RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);
129	return -1;
130	}
131
132#if 0 /* not currently used */
133static int RSA_null_mod_exp(BIGNUM *r0, BIGNUM *I, RSA *rsa)
134	{
135	RSAerr(RSA_F_RSA_NULL, RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);
136	return -1;
137	}
138#endif
139
140static int RSA_null_init(RSA *rsa)
141	{
142	return(1);
143	}
144
145static int RSA_null_finish(RSA *rsa)
146	{
147	return(1);
148	}
149
150
151