1 /* ==================================================================== 2 * Copyright (c) 1998-2002 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 * openssl-core (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 #include <openssl/bn.h> 54 #include <openssl/dh.h> 55 56 57 struct wrapped_callback { 58 void (*callback)(int, int, void *); 59 void *arg; 60 }; 61 62 // callback_wrapper converts an old style generation callback to the newer 63 // |BN_GENCB| form. 64 static int callback_wrapper(int event, int n, BN_GENCB *gencb) { 65 struct wrapped_callback *wrapped = (struct wrapped_callback *) gencb->arg; 66 wrapped->callback(event, n, wrapped->arg); 67 return 1; 68 } 69 70 DH *DH_generate_parameters(int prime_len, int generator, 71 void (*callback)(int, int, void *), void *cb_arg) { 72 if (prime_len < 0 || generator < 0) { 73 return NULL; 74 } 75 76 DH *ret = DH_new(); 77 if (ret == NULL) { 78 return NULL; 79 } 80 81 BN_GENCB gencb_storage; 82 BN_GENCB *cb = NULL; 83 84 struct wrapped_callback wrapped; 85 86 if (callback != NULL) { 87 wrapped.callback = callback; 88 wrapped.arg = cb_arg; 89 90 cb = &gencb_storage; 91 BN_GENCB_set(cb, callback_wrapper, &wrapped); 92 } 93 94 if (!DH_generate_parameters_ex(ret, prime_len, generator, cb)) { 95 goto err; 96 } 97 98 return ret; 99 100 err: 101 DH_free(ret); 102 return NULL; 103 } 104
