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 /*
  58  * If this symbol is defined then ENGINE_get_default_RAND(), the function
  59  * that is used by RAND to hook in implementation code and cache defaults
  60  * (etc), will display brief debugging summaries to stderr with the 'nid'.
  61  */
  62 /* #define ENGINE_RAND_DEBUG */
  63
  64 static ENGINE_TABLE *rand_table = NULL;
  65 static const int dummy_nid = 1;
  66
  67 void ENGINE_unregister_RAND(ENGINE *e)
  68 {
  69     engine_table_unregister(&rand_table, e);
  70 }
  71
  72 static void engine_unregister_all_RAND(void)
  73 {
  74     engine_table_cleanup(&rand_table);
  75 }
  76
  77 int ENGINE_register_RAND(ENGINE *e)
  78 {
  79     if (e->rand_meth)
  80         return engine_table_register(&rand_table,
  81                                      engine_unregister_all_RAND, e,
  82                                      &dummy_nid, 1, 0);
  83     return 1;
  84 }
  85
  86 void ENGINE_register_all_RAND()
  87 {
  88     ENGINE *e;
  89
  90     for (e = ENGINE_get_first(); e; e = ENGINE_get_next(e))
  91         ENGINE_register_RAND(e);
  92 }
  93
  94 int ENGINE_set_default_RAND(ENGINE *e)
  95 {
  96     if (e->rand_meth)
  97         return engine_table_register(&rand_table,
  98                                      engine_unregister_all_RAND, e,
  99                                      &dummy_nid, 1, 1);
 100     return 1;
 101 }
 102
 103 /*
 104  * Exposed API function to get a functional reference from the implementation
 105  * table (ie. try to get a functional reference from the tabled structural
 106  * references).
 107  */
 108 ENGINE *ENGINE_get_default_RAND(void)
 109 {
 110     return engine_table_select(&rand_table, dummy_nid);
 111 }
 112
 113 /* Obtains an RAND implementation from an ENGINE functional reference */
 114 const RAND_METHOD *ENGINE_get_RAND(const ENGINE *e)
 115 {
 116     return e->rand_meth;
 117 }
 118
 119 /* Sets an RAND implementation in an ENGINE structure */
 120 int ENGINE_set_RAND(ENGINE *e, const RAND_METHOD *rand_meth)
 121 {
 122     e->rand_meth = rand_meth;
 123     return 1;
 124 }