1 /* $OpenBSD: dh_asn1.c,v 1.11 2022/01/07 09:27:13 tb 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 #include "dh_local.h" 67 68 /* Override the default free and new methods */ 69 static int 70 dh_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, void *exarg) 71 { 72 if (operation == ASN1_OP_NEW_PRE) { 73 *pval = (ASN1_VALUE *)DH_new(); 74 if (*pval) 75 return 2; 76 return 0; 77 } else if (operation == ASN1_OP_FREE_PRE) { 78 DH_free((DH *)*pval); 79 *pval = NULL; 80 return 2; 81 } 82 return 1; 83 } 84 85 static const ASN1_AUX DHparams_aux = { 86 .app_data = NULL, 87 .flags = 0, 88 .ref_offset = 0, 89 .ref_lock = 0, 90 .asn1_cb = dh_cb, 91 .enc_offset = 0, 92 }; 93 static const ASN1_TEMPLATE DHparams_seq_tt[] = { 94 { 95 .flags = 0, 96 .tag = 0, 97 .offset = offsetof(DH, p), 98 .field_name = "p", 99 .item = &BIGNUM_it, 100 }, 101 { 102 .flags = 0, 103 .tag = 0, 104 .offset = offsetof(DH, g), 105 .field_name = "g", 106 .item = &BIGNUM_it, 107 }, 108 { 109 .flags = ASN1_TFLG_OPTIONAL, 110 .tag = 0, 111 .offset = offsetof(DH, length), 112 .field_name = "length", 113 .item = &ZLONG_it, 114 }, 115 }; 116 117 const ASN1_ITEM DHparams_it = { 118 .itype = ASN1_ITYPE_SEQUENCE, 119 .utype = V_ASN1_SEQUENCE, 120 .templates = DHparams_seq_tt, 121 .tcount = sizeof(DHparams_seq_tt) / sizeof(ASN1_TEMPLATE), 122 .funcs = &DHparams_aux, 123 .size = sizeof(DH), 124 .sname = "DH", 125 }; 126 127 128 DH * 129 d2i_DHparams(DH **a, const unsigned char **in, long len) 130 { 131 return (DH *)ASN1_item_d2i((ASN1_VALUE **)a, in, len, 132 &DHparams_it); 133 } 134 135 int 136 i2d_DHparams(const DH *a, unsigned char **out) 137 { 138 return ASN1_item_i2d((ASN1_VALUE *)a, out, &DHparams_it); 139 } 140 141 DH * 142 d2i_DHparams_bio(BIO *bp, DH **a) 143 { 144 return ASN1_item_d2i_bio(&DHparams_it, bp, a); 145 } 146 147 int 148 i2d_DHparams_bio(BIO *bp, DH *a) 149 { 150 return ASN1_item_i2d_bio(&DHparams_it, bp, a); 151 } 152 153 DH * 154 d2i_DHparams_fp(FILE *fp, DH **a) 155 { 156 return ASN1_item_d2i_fp(&DHparams_it, fp, a); 157 } 158 159 int 160 i2d_DHparams_fp(FILE *fp, DH *a) 161 { 162 return ASN1_item_i2d_fp(&DHparams_it, fp, a); 163 } 164 165 DH * 166 DHparams_dup(DH *dh) 167 { 168 return ASN1_item_dup(&DHparams_it, dh); 169 } 170