crypto/openssl-0.9.7d/crypto/engine/tb_cipher.c

   1 /* ====================================================================
   2  * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  *
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in
  13  *    the documentation and/or other materials provided with the
  14  *    distribution.
  15  *
  16  * 3. All advertising materials mentioning features or use of this
  17  *    software must display the following acknowledgment:
  18  *    "This product includes software developed by the OpenSSL Project
  19  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  20  *
  21  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  22  *    endorse or promote products derived from this software without
  23  *    prior written permission. For written permission, please contact
  24  *    licensing@OpenSSL.org.
  25  *
  26  * 5. Products derived from this software may not be called "OpenSSL"
  27  *    nor may "OpenSSL" appear in their names without prior written
  28  *    permission of the OpenSSL Project.
  29  *
  30  * 6. Redistributions of any form whatsoever must retain the following
  31  *    acknowledgment:
  32  *    "This product includes software developed by the OpenSSL Project
  33  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  34  *
  35  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  36  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  37  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  38  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  39  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  40  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  41  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  42  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  43  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  44  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  45  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  46  * OF THE POSSIBILITY OF SUCH DAMAGE.
  47  * ====================================================================
  48  *
  49  * This product includes cryptographic software written by Eric Young
  50  * (eay@cryptsoft.com).  This product includes software written by Tim
  51  * Hudson (tjh@cryptsoft.com).
  52  *
  53  */
  54
  55 #include <openssl/evp.h>
  56 #include <openssl/engine.h>
  57 #include "eng_int.h"
  58
  59 /* If this symbol is defined then ENGINE_get_cipher_engine(), the function that
  60  * is used by EVP to hook in cipher code and cache defaults (etc), will display
  61  * brief debugging summaries to stderr with the 'nid'. */
  62 /* #define ENGINE_CIPHER_DEBUG */
  63
  64 static ENGINE_TABLE *cipher_table = NULL;
  65
  66 void ENGINE_unregister_ciphers(ENGINE *e)
  67         {
  68         engine_table_unregister(&cipher_table, e);
  69         }
  70
  71 static void engine_unregister_all_ciphers(void)
  72         {
  73         engine_table_cleanup(&cipher_table);
  74         }
  75
  76 int ENGINE_register_ciphers(ENGINE *e)
  77         {
  78         if(e->ciphers)
  79                 {
  80                 const int *nids;
  81                 int num_nids = e->ciphers(e, NULL, &nids, 0);
  82                 if(num_nids > 0)
  83                         return engine_table_register(&cipher_table,
  84                                         engine_unregister_all_ciphers, e, nids,
  85                                         num_nids, 0);
  86                 }
  87         return 1;
  88         }
  89
  90 void ENGINE_register_all_ciphers()
  91         {
  92         ENGINE *e;
  93
  94         for(e=ENGINE_get_first() ; e ; e=ENGINE_get_next(e))
  95                 ENGINE_register_ciphers(e);
  96         }
  97
  98 int ENGINE_set_default_ciphers(ENGINE *e)
  99         {
 100         if(e->ciphers)
 101                 {
 102                 const int *nids;
 103                 int num_nids = e->ciphers(e, NULL, &nids, 0);
 104                 if(num_nids > 0)
 105                         return engine_table_register(&cipher_table,
 106                                         engine_unregister_all_ciphers, e, nids,
 107                                         num_nids, 1);
 108                 }
 109         return 1;
 110         }
 111
 112 /* Exposed API function to get a functional reference from the implementation
 113  * table (ie. try to get a functional reference from the tabled structural
 114  * references) for a given cipher 'nid' */
 115 ENGINE *ENGINE_get_cipher_engine(int nid)
 116         {
 117         return engine_table_select(&cipher_table, nid);
 118         }
 119
 120 /* Obtains a cipher implementation from an ENGINE functional reference */
 121 const EVP_CIPHER *ENGINE_get_cipher(ENGINE *e, int nid)
 122         {
 123         const EVP_CIPHER *ret;
 124         ENGINE_CIPHERS_PTR fn = ENGINE_get_ciphers(e);
 125         if(!fn || !fn(e, &ret, NULL, nid))
 126                 {
 127                 ENGINEerr(ENGINE_F_ENGINE_GET_CIPHER,
 128                                 ENGINE_R_UNIMPLEMENTED_CIPHER);
 129                 return NULL;
 130                 }
 131         return ret;
 132         }
 133
 134 /* Gets the cipher callback from an ENGINE structure */
 135 ENGINE_CIPHERS_PTR ENGINE_get_ciphers(const ENGINE *e)
 136         {
 137         return e->ciphers;
 138         }
 139
 140 /* Sets the cipher callback in an ENGINE structure */
 141 int ENGINE_set_ciphers(ENGINE *e, ENGINE_CIPHERS_PTR f)
 142         {
 143         e->ciphers = f;
 144         return 1;
 145         }