1 /* crypto/engine/tb_ecdh.c */ 2 /* ==================================================================== 3 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 4 * 5 * The Elliptic Curve Public-Key Crypto Library (ECC Code) included 6 * herein is developed by SUN MICROSYSTEMS, INC., and is contributed 7 * to the OpenSSL project. 8 * 9 * The ECC Code is licensed pursuant to the OpenSSL open source 10 * license provided below. 11 * 12 * The ECDH engine software is originally written by Nils Gura and 13 * Douglas Stebila of Sun Microsystems Laboratories. 14 * 15 */ 16 /* ==================================================================== 17 * Copyright (c) 2000-2002 The OpenSSL Project. All rights reserved. 18 * 19 * Redistribution and use in source and binary forms, with or without 20 * modification, are permitted provided that the following conditions 21 * are met: 22 * 23 * 1. Redistributions of source code must retain the above copyright 24 * notice, this list of conditions and the following disclaimer. 25 * 26 * 2. Redistributions in binary form must reproduce the above copyright 27 * notice, this list of conditions and the following disclaimer in 28 * the documentation and/or other materials provided with the 29 * distribution. 30 * 31 * 3. All advertising materials mentioning features or use of this 32 * software must display the following acknowledgment: 33 * "This product includes software developed by the OpenSSL Project 34 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 35 * 36 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 37 * endorse or promote products derived from this software without 38 * prior written permission. For written permission, please contact 39 * licensing (at) OpenSSL.org. 40 * 41 * 5. Products derived from this software may not be called "OpenSSL" 42 * nor may "OpenSSL" appear in their names without prior written 43 * permission of the OpenSSL Project. 44 * 45 * 6. Redistributions of any form whatsoever must retain the following 46 * acknowledgment: 47 * "This product includes software developed by the OpenSSL Project 48 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 51 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 53 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 54 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 55 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 56 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 57 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 59 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 60 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 61 * OF THE POSSIBILITY OF SUCH DAMAGE. 62 * ==================================================================== 63 * 64 * This product includes cryptographic software written by Eric Young 65 * (eay (at) cryptsoft.com). This product includes software written by Tim 66 * Hudson (tjh (at) cryptsoft.com). 67 * 68 */ 69 70 #include "eng_int.h" 71 72 /* If this symbol is defined then ENGINE_get_default_ECDH(), the function that is 73 * used by ECDH to hook in implementation code and cache defaults (etc), will 74 * display brief debugging summaries to stderr with the 'nid'. */ 75 /* #define ENGINE_ECDH_DEBUG */ 76 77 static ENGINE_TABLE *ecdh_table = NULL; 78 static const int dummy_nid = 1; 79 80 void ENGINE_unregister_ECDH(ENGINE *e) 81 { 82 engine_table_unregister(&ecdh_table, e); 83 } 84 85 static void engine_unregister_all_ECDH(void) 86 { 87 engine_table_cleanup(&ecdh_table); 88 } 89 90 int ENGINE_register_ECDH(ENGINE *e) 91 { 92 if(e->ecdh_meth) 93 return engine_table_register(&ecdh_table, 94 engine_unregister_all_ECDH, e, &dummy_nid, 1, 0); 95 return 1; 96 } 97 98 void ENGINE_register_all_ECDH() 99 { 100 ENGINE *e; 101 102 for(e=ENGINE_get_first() ; e ; e=ENGINE_get_next(e)) 103 ENGINE_register_ECDH(e); 104 } 105 106 int ENGINE_set_default_ECDH(ENGINE *e) 107 { 108 if(e->ecdh_meth) 109 return engine_table_register(&ecdh_table, 110 engine_unregister_all_ECDH, e, &dummy_nid, 1, 1); 111 return 1; 112 } 113 114 /* Exposed API function to get a functional reference from the implementation 115 * table (ie. try to get a functional reference from the tabled structural 116 * references). */ 117 ENGINE *ENGINE_get_default_ECDH(void) 118 { 119 return engine_table_select(&ecdh_table, dummy_nid); 120 } 121 122 /* Obtains an ECDH implementation from an ENGINE functional reference */ 123 const ECDH_METHOD *ENGINE_get_ECDH(const ENGINE *e) 124 { 125 return e->ecdh_meth; 126 } 127 128 /* Sets an ECDH implementation in an ENGINE structure */ 129 int ENGINE_set_ECDH(ENGINE *e, const ECDH_METHOD *ecdh_meth) 130 { 131 e->ecdh_meth = ecdh_meth; 132 return 1; 133 } 134
