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rsa_null.c
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1 /* rsa_null.c */
2 /* Written by Dr Stephen N Henson ([email protected]) 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  * [email protected].
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  * ([email protected]). This product includes software written by Tim
55  * Hudson ([email protected]).
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 
72 static int RSA_null_public_encrypt(int flen, const unsigned char *from,
73  unsigned char *to, RSA *rsa,int padding);
74 static int RSA_null_private_encrypt(int flen, const unsigned char *from,
75  unsigned char *to, RSA *rsa,int padding);
76 static int RSA_null_public_decrypt(int flen, const unsigned char *from,
77  unsigned char *to, RSA *rsa,int padding);
78 static 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 */
81 static int RSA_null_mod_exp(const BIGNUM *r0, const BIGNUM *i, RSA *rsa);
82 #endif
83 static int RSA_null_init(RSA *rsa);
84 static int RSA_null_finish(RSA *rsa);
85 static 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 
102 const RSA_METHOD *RSA_null_method(void)
103  {
104  return(&rsa_null_meth);
105  }
106 
107 static 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 
114 static 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 
121 static 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 
128 static 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 */
136 static 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 
143 static int RSA_null_init(RSA *rsa)
144  {
145  return(1);
146  }
147 
148 static int RSA_null_finish(RSA *rsa)
149  {
150  return(1);
151  }
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