1 /* $OpenBSD: tb_cipher.c,v 1.6 2014/06/12 15:49:29 deraadt Exp $ */ 2 /* ==================================================================== 3 * Copyright (c) 2000 The OpenSSL Project. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the 15 * distribution. 16 * 17 * 3. All advertising materials mentioning features or use of this 18 * software must display the following acknowledgment: 19 * "This product includes software developed by the OpenSSL Project 20 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 21 * 22 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 23 * endorse or promote products derived from this software without 24 * prior written permission. For written permission, please contact 25 * licensing@OpenSSL.org. 26 * 27 * 5. Products derived from this software may not be called "OpenSSL" 28 * nor may "OpenSSL" appear in their names without prior written 29 * permission of the OpenSSL Project. 30 * 31 * 6. Redistributions of any form whatsoever must retain the following 32 * acknowledgment: 33 * "This product includes software developed by the OpenSSL Project 34 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 35 * 36 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 37 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 39 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 47 * OF THE POSSIBILITY OF SUCH DAMAGE. 48 * ==================================================================== 49 * 50 * This product includes cryptographic software written by Eric Young 51 * (eay@cryptsoft.com). This product includes software written by Tim 52 * Hudson (tjh@cryptsoft.com). 53 * 54 */ 55 56 #include <openssl/err.h> 57 58 #include "eng_int.h" 59 60 /* If this symbol is defined then ENGINE_get_cipher_engine(), the function that 61 * is used by EVP to hook in cipher code and cache defaults (etc), will display 62 * brief debugging summaries to stderr with the 'nid'. */ 63 /* #define ENGINE_CIPHER_DEBUG */ 64 65 static ENGINE_TABLE *cipher_table = NULL; 66 67 void 68 ENGINE_unregister_ciphers(ENGINE *e) 69 { 70 engine_table_unregister(&cipher_table, e); 71 } 72 73 static void 74 engine_unregister_all_ciphers(void) 75 { 76 engine_table_cleanup(&cipher_table); 77 } 78 79 int 80 ENGINE_register_ciphers(ENGINE *e) 81 { 82 if (e->ciphers) { 83 const int *nids; 84 int num_nids = e->ciphers(e, NULL, &nids, 0); 85 if (num_nids > 0) 86 return engine_table_register(&cipher_table, 87 engine_unregister_all_ciphers, e, nids, 88 num_nids, 0); 89 } 90 return 1; 91 } 92 93 void 94 ENGINE_register_all_ciphers(void) 95 { 96 ENGINE *e; 97 98 for (e = ENGINE_get_first(); e; e = ENGINE_get_next(e)) 99 ENGINE_register_ciphers(e); 100 } 101 102 int 103 ENGINE_set_default_ciphers(ENGINE *e) 104 { 105 if (e->ciphers) { 106 const int *nids; 107 int num_nids = e->ciphers(e, NULL, &nids, 0); 108 if (num_nids > 0) 109 return engine_table_register(&cipher_table, 110 engine_unregister_all_ciphers, e, nids, 111 num_nids, 1); 112 } 113 return 1; 114 } 115 116 /* Exposed API function to get a functional reference from the implementation 117 * table (ie. try to get a functional reference from the tabled structural 118 * references) for a given cipher 'nid' */ 119 ENGINE * 120 ENGINE_get_cipher_engine(int nid) 121 { 122 return engine_table_select(&cipher_table, nid); 123 } 124 125 /* Obtains a cipher implementation from an ENGINE functional reference */ 126 const EVP_CIPHER * 127 ENGINE_get_cipher(ENGINE *e, int nid) 128 { 129 const EVP_CIPHER *ret; 130 ENGINE_CIPHERS_PTR fn = ENGINE_get_ciphers(e); 131 132 if (!fn || !fn(e, &ret, NULL, nid)) { 133 ENGINEerr(ENGINE_F_ENGINE_GET_CIPHER, 134 ENGINE_R_UNIMPLEMENTED_CIPHER); 135 return NULL; 136 } 137 return ret; 138 } 139 140 /* Gets the cipher callback from an ENGINE structure */ 141 ENGINE_CIPHERS_PTR 142 ENGINE_get_ciphers(const ENGINE *e) 143 { 144 return e->ciphers; 145 } 146 147 /* Sets the cipher callback in an ENGINE structure */ 148 int 149 ENGINE_set_ciphers(ENGINE *e, ENGINE_CIPHERS_PTR f) 150 { 151 e->ciphers = f; 152 return 1; 153 } 154