crypto/openssl-0.9.7d/crypto/rsa/rsa_null.c

   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
  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         };
  98
  99 const RSA_METHOD *RSA_null_method(void)
 100         {
 101         return(&rsa_null_meth);
 102         }
 103
 104 static 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
 111 static 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
 118 static 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
 125 static 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 */
 133 static 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
 140 static int RSA_null_init(RSA *rsa)
 141         {
 142         return(1);
 143         }
 144
 145 static int RSA_null_finish(RSA *rsa)
 146         {
 147         return(1);
 148         }
 149
 150