1 /* $OpenBSD: asn1_old_lib.c,v 1.6 2023/07/05 21:23:36 beck Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59 #include <limits.h> 60 #include <stdio.h> 61 #include <string.h> 62 63 #include <openssl/asn1.h> 64 #include <openssl/err.h> 65 66 #include "asn1_local.h" 67 68 static void asn1_put_length(unsigned char **pp, int length); 69 70 int 71 ASN1_get_object(const unsigned char **pp, long *plength, int *ptag, 72 int *pclass, long omax) 73 { 74 int constructed, indefinite; 75 uint32_t tag_number; 76 uint8_t tag_class; 77 size_t length; 78 CBS cbs; 79 int ret = 0; 80 81 *pclass = 0; 82 *ptag = 0; 83 *plength = 0; 84 85 CBS_init(&cbs, *pp, omax); 86 87 if (!asn1_get_object_cbs(&cbs, 0, &tag_class, &constructed, &tag_number, 88 &indefinite, &length)) { 89 ASN1error(ASN1_R_HEADER_TOO_LONG); 90 return 0x80; 91 } 92 93 if (tag_number > INT_MAX) { 94 ASN1error(ASN1_R_HEADER_TOO_LONG); 95 return 0x80; 96 } 97 98 /* 99 * API insanity ahead... in this case we add an error to the stack and 100 * signal an error by setting the 8th bit in the return value... but we 101 * still provide all of the decoded data. 102 */ 103 if (length > CBS_len(&cbs) || length > LONG_MAX) { 104 ASN1error(ASN1_R_TOO_LONG); 105 ret = 0x80; 106 } 107 108 *pclass = tag_class << 6; 109 *ptag = tag_number; 110 *plength = length; 111 112 *pp = CBS_data(&cbs); 113 114 if (constructed) 115 ret |= 1 << 5; 116 if (indefinite) 117 ret |= 1; 118 119 return ret; 120 } 121 LCRYPTO_ALIAS(ASN1_get_object); 122 123 /* class 0 is constructed 124 * constructed == 2 for indefinite length constructed */ 125 void 126 ASN1_put_object(unsigned char **pp, int constructed, int length, int tag, 127 int xclass) 128 { 129 unsigned char *p = *pp; 130 int i, ttag; 131 132 i = (constructed) ? V_ASN1_CONSTRUCTED : 0; 133 i |= (xclass & V_ASN1_PRIVATE); 134 if (tag < 31) 135 *(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG); 136 else { 137 *(p++) = i | V_ASN1_PRIMITIVE_TAG; 138 for(i = 0, ttag = tag; ttag > 0; i++) 139 ttag >>= 7; 140 ttag = i; 141 while (i-- > 0) { 142 p[i] = tag & 0x7f; 143 if (i != (ttag - 1)) 144 p[i] |= 0x80; 145 tag >>= 7; 146 } 147 p += ttag; 148 } 149 if (constructed == 2) 150 *(p++) = 0x80; 151 else 152 asn1_put_length(&p, length); 153 *pp = p; 154 } 155 LCRYPTO_ALIAS(ASN1_put_object); 156 157 int 158 ASN1_put_eoc(unsigned char **pp) 159 { 160 unsigned char *p = *pp; 161 162 *p++ = 0; 163 *p++ = 0; 164 *pp = p; 165 return 2; 166 } 167 LCRYPTO_ALIAS(ASN1_put_eoc); 168 169 static void 170 asn1_put_length(unsigned char **pp, int length) 171 { 172 unsigned char *p = *pp; 173 174 int i, l; 175 if (length <= 127) 176 *(p++) = (unsigned char)length; 177 else { 178 l = length; 179 for (i = 0; l > 0; i++) 180 l >>= 8; 181 *(p++) = i | 0x80; 182 l = i; 183 while (i-- > 0) { 184 p[i] = length & 0xff; 185 length >>= 8; 186 } 187 p += l; 188 } 189 *pp = p; 190 } 191 192 int 193 ASN1_object_size(int constructed, int length, int tag) 194 { 195 int ret; 196 197 ret = length; 198 ret++; 199 if (tag >= 31) { 200 while (tag > 0) { 201 tag >>= 7; 202 ret++; 203 } 204 } 205 if (constructed == 2) 206 return ret + 3; 207 ret++; 208 if (length > 127) { 209 while (length > 0) { 210 length >>= 8; 211 ret++; 212 } 213 } 214 return (ret); 215 } 216 LCRYPTO_ALIAS(ASN1_object_size); 217