rsa_null.c revision 296465 
1/* rsa_null.c */
2/*
3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
4 * 1999.
5 */
6/* ====================================================================
7 * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in
18 *    the documentation and/or other materials provided with the
19 *    distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 *    software must display the following acknowledgment:
23 *    "This product includes software developed by the OpenSSL Project
24 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 *    endorse or promote products derived from this software without
28 *    prior written permission. For written permission, please contact
29 *    licensing@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 *    nor may "OpenSSL" appear in their names without prior written
33 *    permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 *    acknowledgment:
37 *    "This product includes software developed by the OpenSSL Project
38 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 *
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com).  This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
57 *
58 */
59
60#include <stdio.h>
61#include "cryptlib.h"
62#include <openssl/bn.h>
63#include <openssl/rsa.h>
64#include <openssl/rand.h>
65
66/*
67 * This is a dummy RSA implementation that just returns errors when called.
68 * It is designed to allow some RSA functions to work while stopping those
69 * covered by the RSA patent. That is RSA, encryption, decryption, signing
70 * and verify is not allowed but RSA key generation, key checking and other
71 * operations (like storing RSA keys) are permitted.
72 */
73
74static int RSA_null_public_encrypt(int flen, const unsigned char *from,
75                                   unsigned char *to, RSA *rsa, int padding);
76static int RSA_null_private_encrypt(int flen, const unsigned char *from,
77                                    unsigned char *to, RSA *rsa, int padding);
78static int RSA_null_public_decrypt(int flen, const unsigned char *from,
79                                   unsigned char *to, RSA *rsa, int padding);
80static int RSA_null_private_decrypt(int flen, const unsigned char *from,
81                                    unsigned char *to, RSA *rsa, int padding);
82#if 0                           /* not currently used */
83static int RSA_null_mod_exp(const BIGNUM *r0, const BIGNUM *i, RSA *rsa);
84#endif
85static int RSA_null_init(RSA *rsa);
86static int RSA_null_finish(RSA *rsa);
87static RSA_METHOD rsa_null_meth = {
88    "Null RSA",
89    RSA_null_public_encrypt,
90    RSA_null_public_decrypt,
91    RSA_null_private_encrypt,
92    RSA_null_private_decrypt,
93    NULL,
94    NULL,
95    RSA_null_init,
96    RSA_null_finish,
97    0,
98    NULL,
99    NULL,
100    NULL,
101    NULL
102};
103
104const RSA_METHOD *RSA_null_method(void)
105{
106    return (&rsa_null_meth);
107}
108
109static int RSA_null_public_encrypt(int flen, const unsigned char *from,
110                                   unsigned char *to, RSA *rsa, int padding)
111{
112    RSAerr(RSA_F_RSA_NULL_PUBLIC_ENCRYPT, RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);
113    return -1;
114}
115
116static int RSA_null_private_encrypt(int flen, const unsigned char *from,
117                                    unsigned char *to, RSA *rsa, int padding)
118{
119    RSAerr(RSA_F_RSA_NULL_PRIVATE_ENCRYPT,
120           RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);
121    return -1;
122}
123
124static int RSA_null_private_decrypt(int flen, const unsigned char *from,
125                                    unsigned char *to, RSA *rsa, int padding)
126{
127    RSAerr(RSA_F_RSA_NULL_PRIVATE_DECRYPT,
128           RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);
129    return -1;
130}
131
132static int RSA_null_public_decrypt(int flen, const unsigned char *from,
133                                   unsigned char *to, RSA *rsa, int padding)
134{
135    RSAerr(RSA_F_RSA_NULL_PUBLIC_DECRYPT, RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);
136    return -1;
137}
138
139#if 0                           /* not currently used */
140static int RSA_null_mod_exp(BIGNUM *r0, BIGNUM *I, RSA *rsa)
141{
142    ... err(RSA_F_RSA_NULL_MOD_EXP, RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);
143    return -1;
144}
145#endif
146
147static int RSA_null_init(RSA *rsa)
148{
149    return (1);
150}
151
152static int RSA_null_finish(RSA *rsa)
153{
154    return (1);
155}
156