crypto/rsa/rsa_null.c

   1 /*
   2  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
   3  * 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 "internal/cryptlib.h"
  61 #include <openssl/bn.h>
  62 #include <openssl/rsa.h>
  63 #include <openssl/rand.h>
  64
  65 /*
  66  * This is a dummy RSA implementation that just returns errors when called.
  67  * It is designed to allow some RSA functions to work while stopping those
  68  * covered by the RSA patent. That is RSA, encryption, decryption, signing
  69  * and verify is not allowed but RSA key generation, key checking and other
  70  * operations (like storing RSA keys) are permitted.
  71  */
  72
  73 static int RSA_null_public_encrypt(int flen, const unsigned char *from,
  74                                    unsigned char *to, RSA *rsa, int padding);
  75 static int RSA_null_private_encrypt(int flen, const unsigned char *from,
  76                                     unsigned char *to, RSA *rsa, int padding);
  77 static int RSA_null_public_decrypt(int flen, const unsigned char *from,
  78                                    unsigned char *to, RSA *rsa, int padding);
  79 static int RSA_null_private_decrypt(int flen, const unsigned char *from,
  80                                     unsigned char *to, RSA *rsa, int padding);
  81 static int RSA_null_init(RSA *rsa);
  82 static int RSA_null_finish(RSA *rsa);
  83 static RSA_METHOD rsa_null_meth = {
  84     "Null RSA",
  85     RSA_null_public_encrypt,
  86     RSA_null_public_decrypt,
  87     RSA_null_private_encrypt,
  88     RSA_null_private_decrypt,
  89     NULL,
  90     NULL,
  91     RSA_null_init,
  92     RSA_null_finish,
  93     0,
  94     NULL,
  95     NULL,
  96     NULL,
  97     NULL
  98 };
  99
 100 const RSA_METHOD *RSA_null_method(void)
 101 {
 102     return (&rsa_null_meth);
 103 }
 104
 105 static int RSA_null_public_encrypt(int flen, const unsigned char *from,
 106                                    unsigned char *to, RSA *rsa, int padding)
 107 {
 108     RSAerr(RSA_F_RSA_NULL_PUBLIC_ENCRYPT, RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);
 109     return -1;
 110 }
 111
 112 static int RSA_null_private_encrypt(int flen, const unsigned char *from,
 113                                     unsigned char *to, RSA *rsa, int padding)
 114 {
 115     RSAerr(RSA_F_RSA_NULL_PRIVATE_ENCRYPT,
 116            RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);
 117     return -1;
 118 }
 119
 120 static int RSA_null_private_decrypt(int flen, const unsigned char *from,
 121                                     unsigned char *to, RSA *rsa, int padding)
 122 {
 123     RSAerr(RSA_F_RSA_NULL_PRIVATE_DECRYPT,
 124            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 static int RSA_null_init(RSA *rsa)
 136 {
 137     return (1);
 138 }
 139
 140 static int RSA_null_finish(RSA *rsa)
 141 {
 142     return (1);
 143 }