a_bytes.c revision 296341
1/* crypto/asn1/a_bytes.c */ 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 <stdio.h> 60#include "cryptlib.h" 61#include <openssl/asn1.h> 62 63static int asn1_collate_primitive(ASN1_STRING *a, ASN1_const_CTX *c); 64/* 65 * type is a 'bitmap' of acceptable string types. 66 */ 67ASN1_STRING *d2i_ASN1_type_bytes(ASN1_STRING **a, const unsigned char **pp, 68 long length, int type) 69{ 70 ASN1_STRING *ret = NULL; 71 const unsigned char *p; 72 unsigned char *s; 73 long len; 74 int inf, tag, xclass; 75 int i = 0; 76 77 p = *pp; 78 inf = ASN1_get_object(&p, &len, &tag, &xclass, length); 79 if (inf & 0x80) 80 goto err; 81 82 if (tag >= 32) { 83 i = ASN1_R_TAG_VALUE_TOO_HIGH; 84 goto err; 85 } 86 if (!(ASN1_tag2bit(tag) & type)) { 87 i = ASN1_R_WRONG_TYPE; 88 goto err; 89 } 90 91 /* If a bit-string, exit early */ 92 if (tag == V_ASN1_BIT_STRING) 93 return (d2i_ASN1_BIT_STRING(a, pp, length)); 94 95 if ((a == NULL) || ((*a) == NULL)) { 96 if ((ret = ASN1_STRING_new()) == NULL) 97 return (NULL); 98 } else 99 ret = (*a); 100 101 if (len != 0) { 102 s = (unsigned char *)OPENSSL_malloc((int)len + 1); 103 if (s == NULL) { 104 i = ERR_R_MALLOC_FAILURE; 105 goto err; 106 } 107 memcpy(s, p, (int)len); 108 s[len] = '\0'; 109 p += len; 110 } else 111 s = NULL; 112 113 if (ret->data != NULL) 114 OPENSSL_free(ret->data); 115 ret->length = (int)len; 116 ret->data = s; 117 ret->type = tag; 118 if (a != NULL) 119 (*a) = ret; 120 *pp = p; 121 return (ret); 122 err: 123 ASN1err(ASN1_F_D2I_ASN1_TYPE_BYTES, i); 124 if ((ret != NULL) && ((a == NULL) || (*a != ret))) 125 ASN1_STRING_free(ret); 126 return (NULL); 127} 128 129int i2d_ASN1_bytes(ASN1_STRING *a, unsigned char **pp, int tag, int xclass) 130{ 131 int ret, r, constructed; 132 unsigned char *p; 133 134 if (a == NULL) 135 return (0); 136 137 if (tag == V_ASN1_BIT_STRING) 138 return (i2d_ASN1_BIT_STRING(a, pp)); 139 140 ret = a->length; 141 r = ASN1_object_size(0, ret, tag); 142 if (pp == NULL) 143 return (r); 144 p = *pp; 145 146 if ((tag == V_ASN1_SEQUENCE) || (tag == V_ASN1_SET)) 147 constructed = 1; 148 else 149 constructed = 0; 150 ASN1_put_object(&p, constructed, ret, tag, xclass); 151 memcpy(p, a->data, a->length); 152 p += a->length; 153 *pp = p; 154 return (r); 155} 156 157ASN1_STRING *d2i_ASN1_bytes(ASN1_STRING **a, const unsigned char **pp, 158 long length, int Ptag, int Pclass) 159{ 160 ASN1_STRING *ret = NULL; 161 const unsigned char *p; 162 unsigned char *s; 163 long len; 164 int inf, tag, xclass; 165 int i = 0; 166 167 if ((a == NULL) || ((*a) == NULL)) { 168 if ((ret = ASN1_STRING_new()) == NULL) 169 return (NULL); 170 } else 171 ret = (*a); 172 173 p = *pp; 174 inf = ASN1_get_object(&p, &len, &tag, &xclass, length); 175 if (inf & 0x80) { 176 i = ASN1_R_BAD_OBJECT_HEADER; 177 goto err; 178 } 179 180 if (tag != Ptag) { 181 i = ASN1_R_WRONG_TAG; 182 goto err; 183 } 184 185 if (inf & V_ASN1_CONSTRUCTED) { 186 ASN1_const_CTX c; 187 188 c.pp = pp; 189 c.p = p; 190 c.inf = inf; 191 c.slen = len; 192 c.tag = Ptag; 193 c.xclass = Pclass; 194 c.max = (length == 0) ? 0 : (p + length); 195 if (!asn1_collate_primitive(ret, &c)) 196 goto err; 197 else { 198 p = c.p; 199 } 200 } else { 201 if (len != 0) { 202 if ((ret->length < len) || (ret->data == NULL)) { 203 if (ret->data != NULL) 204 OPENSSL_free(ret->data); 205 s = (unsigned char *)OPENSSL_malloc((int)len + 1); 206 if (s == NULL) { 207 i = ERR_R_MALLOC_FAILURE; 208 goto err; 209 } 210 } else 211 s = ret->data; 212 memcpy(s, p, (int)len); 213 s[len] = '\0'; 214 p += len; 215 } else { 216 s = NULL; 217 if (ret->data != NULL) 218 OPENSSL_free(ret->data); 219 } 220 221 ret->length = (int)len; 222 ret->data = s; 223 ret->type = Ptag; 224 } 225 226 if (a != NULL) 227 (*a) = ret; 228 *pp = p; 229 return (ret); 230 err: 231 if ((ret != NULL) && ((a == NULL) || (*a != ret))) 232 ASN1_STRING_free(ret); 233 ASN1err(ASN1_F_D2I_ASN1_BYTES, i); 234 return (NULL); 235} 236 237/* 238 * We are about to parse 0..n d2i_ASN1_bytes objects, we are to collapse them 239 * into the one structure that is then returned 240 */ 241/* 242 * There have been a few bug fixes for this function from Paul Keogh 243 * <paul.keogh@sse.ie>, many thanks to him 244 */ 245static int asn1_collate_primitive(ASN1_STRING *a, ASN1_const_CTX *c) 246{ 247 ASN1_STRING *os = NULL; 248 BUF_MEM b; 249 int num; 250 251 b.length = 0; 252 b.max = 0; 253 b.data = NULL; 254 255 if (a == NULL) { 256 c->error = ERR_R_PASSED_NULL_PARAMETER; 257 goto err; 258 } 259 260 num = 0; 261 for (;;) { 262 if (c->inf & 1) { 263 c->eos = ASN1_const_check_infinite_end(&c->p, 264 (long)(c->max - c->p)); 265 if (c->eos) 266 break; 267 } else { 268 if (c->slen <= 0) 269 break; 270 } 271 272 c->q = c->p; 273 if (d2i_ASN1_bytes(&os, &c->p, c->max - c->p, c->tag, c->xclass) 274 == NULL) { 275 c->error = ERR_R_ASN1_LIB; 276 goto err; 277 } 278 279 if (!BUF_MEM_grow_clean(&b, num + os->length)) { 280 c->error = ERR_R_BUF_LIB; 281 goto err; 282 } 283 memcpy(&(b.data[num]), os->data, os->length); 284 if (!(c->inf & 1)) 285 c->slen -= (c->p - c->q); 286 num += os->length; 287 } 288 289 if (!asn1_const_Finish(c)) 290 goto err; 291 292 a->length = num; 293 if (a->data != NULL) 294 OPENSSL_free(a->data); 295 a->data = (unsigned char *)b.data; 296 if (os != NULL) 297 ASN1_STRING_free(os); 298 return (1); 299 err: 300 ASN1err(ASN1_F_ASN1_COLLATE_PRIMITIVE, c->error); 301 if (os != NULL) 302 ASN1_STRING_free(os); 303 if (b.data != NULL) 304 OPENSSL_free(b.data); 305 return (0); 306} 307