release/src/router/openssl/crypto/engine/tb_rand.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 "eng_int.h"
  56
  57 /* If this symbol is defined then ENGINE_get_default_RAND(), the function that is
  58  * used by RAND to hook in implementation code and cache defaults (etc), will
  59  * display brief debugging summaries to stderr with the 'nid'. */
  60 /* #define ENGINE_RAND_DEBUG */
  61
  62 static ENGINE_TABLE *rand_table = NULL;
  63 static const int dummy_nid = 1;
  64
  65 void ENGINE_unregister_RAND(ENGINE *e)
  66         {
  67         engine_table_unregister(&rand_table, e);
  68         }
  69
  70 static void engine_unregister_all_RAND(void)
  71         {
  72         engine_table_cleanup(&rand_table);
  73         }
  74
  75 int ENGINE_register_RAND(ENGINE *e)
  76         {
  77         if(e->rand_meth)
  78                 return engine_table_register(&rand_table,
  79                                 engine_unregister_all_RAND, e, &dummy_nid, 1, 0);
  80         return 1;
  81         }
  82
  83 void ENGINE_register_all_RAND()
  84         {
  85         ENGINE *e;
  86
  87         for(e=ENGINE_get_first() ; e ; e=ENGINE_get_next(e))
  88                 ENGINE_register_RAND(e);
  89         }
  90
  91 int ENGINE_set_default_RAND(ENGINE *e)
  92         {
  93         if(e->rand_meth)
  94                 return engine_table_register(&rand_table,
  95                                 engine_unregister_all_RAND, e, &dummy_nid, 1, 1);
  96         return 1;
  97         }
  98
  99 /* Exposed API function to get a functional reference from the implementation
 100  * table (ie. try to get a functional reference from the tabled structural
 101  * references). */
 102 ENGINE *ENGINE_get_default_RAND(void)
 103         {
 104         return engine_table_select(&rand_table, dummy_nid);
 105         }
 106
 107 /* Obtains an RAND implementation from an ENGINE functional reference */
 108 const RAND_METHOD *ENGINE_get_RAND(const ENGINE *e)
 109         {
 110         return e->rand_meth;
 111         }
 112
 113 /* Sets an RAND implementation in an ENGINE structure */
 114 int ENGINE_set_RAND(ENGINE *e, const RAND_METHOD *rand_meth)
 115         {
 116         e->rand_meth = rand_meth;
 117         return 1;
 118         }