1 /* $OpenBSD: asn1_old_lib.c,v 1.4 2022/05/05 19:18:56 jsing 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_locl.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 } 121 122 /* class 0 is constructed 123 * constructed == 2 for indefinite length constructed */ 124 void 125 ASN1_put_object(unsigned char **pp, int constructed, int length, int tag, 126 int xclass) 127 { 128 unsigned char *p = *pp; 129 int i, ttag; 130 131 i = (constructed) ? V_ASN1_CONSTRUCTED : 0; 132 i |= (xclass & V_ASN1_PRIVATE); 133 if (tag < 31) 134 *(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG); 135 else { 136 *(p++) = i | V_ASN1_PRIMITIVE_TAG; 137 for(i = 0, ttag = tag; ttag > 0; i++) 138 ttag >>= 7; 139 ttag = i; 140 while (i-- > 0) { 141 p[i] = tag & 0x7f; 142 if (i != (ttag - 1)) 143 p[i] |= 0x80; 144 tag >>= 7; 145 } 146 p += ttag; 147 } 148 if (constructed == 2) 149 *(p++) = 0x80; 150 else 151 asn1_put_length(&p, length); 152 *pp = p; 153 } 154 155 int 156 ASN1_put_eoc(unsigned char **pp) 157 { 158 unsigned char *p = *pp; 159 160 *p++ = 0; 161 *p++ = 0; 162 *pp = p; 163 return 2; 164 } 165 166 static void 167 asn1_put_length(unsigned char **pp, int length) 168 { 169 unsigned char *p = *pp; 170 171 int i, l; 172 if (length <= 127) 173 *(p++) = (unsigned char)length; 174 else { 175 l = length; 176 for (i = 0; l > 0; i++) 177 l >>= 8; 178 *(p++) = i | 0x80; 179 l = i; 180 while (i-- > 0) { 181 p[i] = length & 0xff; 182 length >>= 8; 183 } 184 p += l; 185 } 186 *pp = p; 187 } 188 189 int 190 ASN1_object_size(int constructed, int length, int tag) 191 { 192 int ret; 193 194 ret = length; 195 ret++; 196 if (tag >= 31) { 197 while (tag > 0) { 198 tag >>= 7; 199 ret++; 200 } 201 } 202 if (constructed == 2) 203 return ret + 3; 204 ret++; 205 if (length > 127) { 206 while (length > 0) { 207 length >>= 8; 208 ret++; 209 } 210 } 211 return (ret); 212 } 213