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_cipher_engine(), the function 59 * that is used by EVP to hook in cipher code and cache defaults (etc), will 60 * display brief debugging summaries to stderr with the 'nid'. 61 */ 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 const int *nids; 80 int num_nids = e->ciphers(e, NULL, &nids, 0); 81 if (num_nids > 0) 82 return engine_table_register(&cipher_table, 83 engine_unregister_all_ciphers, e, 84 nids, num_nids, 0); 85 } 86 return 1; 87 } 88 89 void ENGINE_register_all_ciphers() 90 { 91 ENGINE *e; 92 93 for (e = ENGINE_get_first(); e; e = ENGINE_get_next(e)) 94 ENGINE_register_ciphers(e); 95 } 96 97 int ENGINE_set_default_ciphers(ENGINE *e) 98 { 99 if (e->ciphers) { 100 const int *nids; 101 int num_nids = e->ciphers(e, NULL, &nids, 0); 102 if (num_nids > 0) 103 return engine_table_register(&cipher_table, 104 engine_unregister_all_ciphers, e, 105 nids, num_nids, 1); 106 } 107 return 1; 108 } 109 110 /* 111 * Exposed API function to get a functional reference from the implementation 112 * table (ie. try to get a functional reference from the tabled structural 113 * references) for a given cipher 'nid' 114 */ 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 ENGINEerr(ENGINE_F_ENGINE_GET_CIPHER, ENGINE_R_UNIMPLEMENTED_CIPHER); 127 return NULL; 128 } 129 return ret; 130 } 131 132 /* Gets the cipher callback from an ENGINE structure */ 133 ENGINE_CIPHERS_PTR ENGINE_get_ciphers(const ENGINE *e) 134 { 135 return e->ciphers; 136 } 137 138 /* Sets the cipher callback in an ENGINE structure */ 139 int ENGINE_set_ciphers(ENGINE *e, ENGINE_CIPHERS_PTR f) 140 { 141 e->ciphers = f; 142 return 1; 143 } 144