1/* rsa_null.c */
2/* Written by Dr Stephen N Henson (steve@openssl.org) 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	NULL,
98	NULL,
99	NULL
100	};
101
102const RSA_METHOD *RSA_null_method(void)
103	{
104	return(&rsa_null_meth);
105	}
106
107static int RSA_null_public_encrypt(int flen, const unsigned char *from,
108	     unsigned char *to, RSA *rsa, int padding)
109	{
110	RSAerr(RSA_F_RSA_NULL_PUBLIC_ENCRYPT, RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);
111	return -1;
112	}
113
114static int RSA_null_private_encrypt(int flen, const unsigned char *from,
115	     unsigned char *to, RSA *rsa, int padding)
116	{
117	RSAerr(RSA_F_RSA_NULL_PRIVATE_ENCRYPT, RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);
118	return -1;
119	}
120
121static int RSA_null_private_decrypt(int flen, const unsigned char *from,
122	     unsigned char *to, RSA *rsa, int padding)
123	{
124	RSAerr(RSA_F_RSA_NULL_PRIVATE_DECRYPT, RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);
125	return -1;
126	}
127
128static int RSA_null_public_decrypt(int flen, const unsigned char *from,
129	     unsigned char *to, RSA *rsa, int padding)
130	{
131	RSAerr(RSA_F_RSA_NULL_PUBLIC_DECRYPT, RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);
132	return -1;
133	}
134
135#if 0 /* not currently used */
136static int RSA_null_mod_exp(BIGNUM *r0, BIGNUM *I, RSA *rsa)
137	{
138	...err(RSA_F_RSA_NULL_MOD_EXP, RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);
139	return -1;
140	}
141#endif
142
143static int RSA_null_init(RSA *rsa)
144	{
145	return(1);
146	}
147
148static int RSA_null_finish(RSA *rsa)
149	{
150	return(1);
151	}
152