1 /* $OpenBSD: dh_asn1.c,v 1.7 2015/02/10 05:12:23 jsing Exp $ */ 2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL 3 * project 2000. 4 */ 5 /* ==================================================================== 6 * Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. All advertising materials mentioning features or use of this 21 * software must display the following acknowledgment: 22 * "This product includes software developed by the OpenSSL Project 23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 24 * 25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26 * endorse or promote products derived from this software without 27 * prior written permission. For written permission, please contact 28 * licensing@OpenSSL.org. 29 * 30 * 5. Products derived from this software may not be called "OpenSSL" 31 * nor may "OpenSSL" appear in their names without prior written 32 * permission of the OpenSSL Project. 33 * 34 * 6. Redistributions of any form whatsoever must retain the following 35 * acknowledgment: 36 * "This product includes software developed by the OpenSSL Project 37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50 * OF THE POSSIBILITY OF SUCH DAMAGE. 51 * ==================================================================== 52 * 53 * This product includes cryptographic software written by Eric Young 54 * (eay@cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh@cryptsoft.com). 56 * 57 */ 58 59 #include <stdio.h> 60 61 #include <openssl/asn1t.h> 62 #include <openssl/bn.h> 63 #include <openssl/dh.h> 64 #include <openssl/objects.h> 65 66 /* Override the default free and new methods */ 67 static int 68 dh_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, void *exarg) 69 { 70 if (operation == ASN1_OP_NEW_PRE) { 71 *pval = (ASN1_VALUE *)DH_new(); 72 if (*pval) 73 return 2; 74 return 0; 75 } else if (operation == ASN1_OP_FREE_PRE) { 76 DH_free((DH *)*pval); 77 *pval = NULL; 78 return 2; 79 } 80 return 1; 81 } 82 83 static const ASN1_AUX DHparams_aux = { 84 .app_data = NULL, 85 .flags = 0, 86 .ref_offset = 0, 87 .ref_lock = 0, 88 .asn1_cb = dh_cb, 89 .enc_offset = 0, 90 }; 91 static const ASN1_TEMPLATE DHparams_seq_tt[] = { 92 { 93 .flags = 0, 94 .tag = 0, 95 .offset = offsetof(DH, p), 96 .field_name = "p", 97 .item = &BIGNUM_it, 98 }, 99 { 100 .flags = 0, 101 .tag = 0, 102 .offset = offsetof(DH, g), 103 .field_name = "g", 104 .item = &BIGNUM_it, 105 }, 106 { 107 .flags = ASN1_TFLG_OPTIONAL, 108 .tag = 0, 109 .offset = offsetof(DH, length), 110 .field_name = "length", 111 .item = &ZLONG_it, 112 }, 113 }; 114 115 const ASN1_ITEM DHparams_it = { 116 .itype = ASN1_ITYPE_SEQUENCE, 117 .utype = V_ASN1_SEQUENCE, 118 .templates = DHparams_seq_tt, 119 .tcount = sizeof(DHparams_seq_tt) / sizeof(ASN1_TEMPLATE), 120 .funcs = &DHparams_aux, 121 .size = sizeof(DH), 122 .sname = "DH", 123 }; 124 125 126 DH * 127 d2i_DHparams(DH **a, const unsigned char **in, long len) 128 { 129 return (DH *)ASN1_item_d2i((ASN1_VALUE **)a, in, len, 130 &DHparams_it); 131 } 132 133 int 134 i2d_DHparams(const DH *a, unsigned char **out) 135 { 136 return ASN1_item_i2d((ASN1_VALUE *)a, out, &DHparams_it); 137 } 138 139 DH * 140 DHparams_dup(DH *dh) 141 { 142 return ASN1_item_dup(ASN1_ITEM_rptr(DHparams), dh); 143 } 144