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 (at) 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 (at) cryptsoft.com). This product includes software written by Tim 51 * Hudson (tjh (at) cryptsoft.com). 52 * 53 */ 54 55 #include "eng_int.h" 56 57 /* If this symbol is defined then ENGINE_get_default_DH(), the function that is 58 * used by DH to hook in implementation code and cache defaults (etc), will 59 * display brief debugging summaries to stderr with the 'nid'. */ 60 /* #define ENGINE_DH_DEBUG */ 61 62 static ENGINE_TABLE *dh_table = NULL; 63 static const int dummy_nid = 1; 64 65 void ENGINE_unregister_DH(ENGINE *e) 66 { 67 engine_table_unregister(&dh_table, e); 68 } 69 70 static void engine_unregister_all_DH(void) 71 { 72 engine_table_cleanup(&dh_table); 73 } 74 75 int ENGINE_register_DH(ENGINE *e) 76 { 77 if(e->dh_meth) 78 return engine_table_register(&dh_table, 79 engine_unregister_all_DH, e, &dummy_nid, 1, 0); 80 return 1; 81 } 82 83 void ENGINE_register_all_DH() 84 { 85 ENGINE *e; 86 87 for(e=ENGINE_get_first() ; e ; e=ENGINE_get_next(e)) 88 ENGINE_register_DH(e); 89 } 90 91 int ENGINE_set_default_DH(ENGINE *e) 92 { 93 if(e->dh_meth) 94 return engine_table_register(&dh_table, 95 engine_unregister_all_DH, 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_DH(void) 103 { 104 return engine_table_select(&dh_table, dummy_nid); 105 } 106 107 /* Obtains an DH implementation from an ENGINE functional reference */ 108 const DH_METHOD *ENGINE_get_DH(const ENGINE *e) 109 { 110 return e->dh_meth; 111 } 112 113 /* Sets an DH implementation in an ENGINE structure */ 114 int ENGINE_set_DH(ENGINE *e, const DH_METHOD *dh_meth) 115 { 116 e->dh_meth = dh_meth; 117 return 1; 118 } 119
