asn1_lib.c revision 55714
1139749Simp/* crypto/asn1/asn1_lib.c */ 2119853Scg/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 350724Scg * All rights reserved. 450724Scg * 550724Scg * This package is an SSL implementation written 650724Scg * by Eric Young (eay@cryptsoft.com). 750724Scg * The implementation was written so as to conform with Netscapes SSL. 850724Scg * 950724Scg * This library is free for commercial and non-commercial use as long as 1050724Scg * the following conditions are aheared to. The following conditions 1150724Scg * apply to all code found in this distribution, be it the RC4, RSA, 1250724Scg * lhash, DES, etc., code; not just the SSL code. The SSL documentation 1350724Scg * included with this distribution is covered by the same copyright terms 1450724Scg * except that the holder is Tim Hudson (tjh@cryptsoft.com). 1550724Scg * 1650724Scg * Copyright remains Eric Young's, and as such any Copyright notices in 1750724Scg * the code are not to be removed. 1850724Scg * If this package is used in a product, Eric Young should be given attribution 1950724Scg * as the author of the parts of the library used. 2050724Scg * This can be in the form of a textual message at program startup or 2150724Scg * in documentation (online or textual) provided with the package. 2250724Scg * 2350724Scg * Redistribution and use in source and binary forms, with or without 2450724Scg * modification, are permitted provided that the following conditions 2550724Scg * are met: 2650733Speter * 1. Redistributions of source code must retain the copyright 2750724Scg * notice, this list of conditions and the following disclaimer. 2850724Scg * 2. Redistributions in binary form must reproduce the above copyright 29119209Sorion * notice, this list of conditions and the following disclaimer in the 3058384Scg * documentation and/or other materials provided with the distribution. 3158384Scg * 3. All advertising materials mentioning features or use of this software 3283612Scg * must display the following acknowledgement: 3383612Scg * "This product includes cryptographic software written by 3483612Scg * Eric Young (eay@cryptsoft.com)" 3583612Scg * The word 'cryptographic' can be left out if the rouines from the library 3683612Scg * being used are not cryptographic related :-). 3783612Scg * 4. If you include any Windows specific code (or a derivative thereof) from 3883612Scg * the apps directory (application code) you must include an acknowledgement: 3983612Scg * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 4083612Scg * 4158384Scg * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42102302Sorion * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4358384Scg * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4458384Scg * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 4558384Scg * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 4658384Scg * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4758384Scg * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4858384Scg * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4958384Scg * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5058384Scg * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5158384Scg * SUCH DAMAGE. 5258384Scg * 5358384Scg * The licence and distribution terms for any publically available version or 5458384Scg * derivative of this code cannot be changed. i.e. this code cannot simply be 5558384Scg * copied and put under another distribution licence 5658384Scg * [including the GNU Public Licence.] 5758384Scg */ 5858384Scg 5995499Sorion#include <stdio.h> 6095499Sorion#include "cryptlib.h" 6195499Sorion#include <openssl/asn1.h> 6295499Sorion#include <openssl/asn1_mac.h> 6395499Sorion 6495499Sorionstatic int asn1_get_length(unsigned char **pp,int *inf,long *rl,int max); 6558384Scgstatic void asn1_put_length(unsigned char **pp, int length); 6658384Scgconst char *ASN1_version="ASN.1" OPENSSL_VERSION_PTEXT; 6758384Scg 6858384Scgint ASN1_check_infinite_end(unsigned char **p, long len) 6958384Scg { 70102302Sorion /* If there is 0 or 1 byte left, the length check should pick 71102302Sorion * things up */ 7258384Scg if (len <= 0) 7358384Scg return(1); 7458384Scg else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0)) 7558384Scg { 7658384Scg (*p)+=2; 7758384Scg return(1); 7858384Scg } 7958384Scg return(0); 8058384Scg } 8158384Scg 8258384Scg 8378668Scgint ASN1_get_object(unsigned char **pp, long *plength, int *ptag, int *pclass, 84149949Snetchild long omax) 8550724Scg { 8670134Scg int i,ret; 8770134Scg long l; 8850724Scg unsigned char *p= *pp; 8974763Scg int tag,xclass,inf; 9070134Scg long max=omax; 9170134Scg 9270134Scg if (!max) goto err; 9370134Scg ret=(*p&V_ASN1_CONSTRUCTED); 9470134Scg xclass=(*p&V_ASN1_PRIVATE); 9570134Scg i= *p&V_ASN1_PRIMITIVE_TAG; 9665340Scg if (i == V_ASN1_PRIMITIVE_TAG) 9778668Scg { /* high-tag */ 9878668Scg p++; 9958384Scg if (--max == 0) goto err; 10058384Scg l=0; 10167652Scg while (*p&0x80) 10267652Scg { 10383612Scg l<<=7L; 104168861Sariff l|= *(p++)&0x7f; 10558384Scg if (--max == 0) goto err; 106109818Sorion } 107109818Sorion l<<=7L; 108 l|= *(p++)&0x7f; 109 tag=(int)l; 110 } 111 else 112 { 113 tag=i; 114 p++; 115 if (--max == 0) goto err; 116 } 117 *ptag=tag; 118 *pclass=xclass; 119 if (!asn1_get_length(&p,&inf,plength,(int)max)) goto err; 120 121#if 0 122 fprintf(stderr,"p=%d + *plength=%ld > omax=%ld + *pp=%d (%d > %d)\n", 123 (int)p,*plength,omax,(int)*pp,(int)(p+ *plength), 124 (int)(omax+ *pp)); 125 126#endif 127#if 0 128 if ((p+ *plength) > (omax+ *pp)) 129 { 130 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_TOO_LONG); 131 /* Set this so that even if things are not long enough 132 * the values are set correctly */ 133 ret|=0x80; 134 } 135#endif 136 *pp=p; 137 return(ret|inf); 138err: 139 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG); 140 return(0x80); 141 } 142 143static int asn1_get_length(unsigned char **pp, int *inf, long *rl, int max) 144 { 145 unsigned char *p= *pp; 146 long ret=0; 147 int i; 148 149 if (max-- < 1) return(0); 150 if (*p == 0x80) 151 { 152 *inf=1; 153 ret=0; 154 p++; 155 } 156 else 157 { 158 *inf=0; 159 i= *p&0x7f; 160 if (*(p++) & 0x80) 161 { 162 if (max-- == 0) return(0); 163 while (i-- > 0) 164 { 165 ret<<=8L; 166 ret|= *(p++); 167 if (max-- == 0) return(0); 168 } 169 } 170 else 171 ret=i; 172 } 173 *pp=p; 174 *rl=ret; 175 return(1); 176 } 177 178/* class 0 is constructed 179 * constructed == 2 for indefinitle length constructed */ 180void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag, 181 int xclass) 182 { 183 unsigned char *p= *pp; 184 int i; 185 186 i=(constructed)?V_ASN1_CONSTRUCTED:0; 187 i|=(xclass&V_ASN1_PRIVATE); 188 if (tag < 31) 189 *(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG); 190 else 191 { 192 *(p++)=i|V_ASN1_PRIMITIVE_TAG; 193 while (tag > 0x7f) 194 { 195 *(p++)=(tag&0x7f)|0x80; 196 tag>>=7; 197 } 198 *(p++)=(tag&0x7f); 199 } 200 if ((constructed == 2) && (length == 0)) 201 *(p++)=0x80; /* der_put_length would output 0 instead */ 202 else 203 asn1_put_length(&p,length); 204 *pp=p; 205 } 206 207static void asn1_put_length(unsigned char **pp, int length) 208 { 209 unsigned char *p= *pp; 210 int i,l; 211 if (length <= 127) 212 *(p++)=(unsigned char)length; 213 else 214 { 215 l=length; 216 for (i=0; l > 0; i++) 217 l>>=8; 218 *(p++)=i|0x80; 219 l=i; 220 while (i-- > 0) 221 { 222 p[i]=length&0xff; 223 length>>=8; 224 } 225 p+=l; 226 } 227 *pp=p; 228 } 229 230int ASN1_object_size(int constructed, int length, int tag) 231 { 232 int ret; 233 234 ret=length; 235 ret++; 236 if (tag >= 31) 237 { 238 while (tag > 0) 239 { 240 tag>>=7; 241 ret++; 242 } 243 } 244 if ((length == 0) && (constructed == 2)) 245 ret+=2; 246 ret++; 247 if (length > 127) 248 { 249 while (length > 0) 250 { 251 length>>=8; 252 ret++; 253 } 254 } 255 return(ret); 256 } 257 258int asn1_Finish(ASN1_CTX *c) 259 { 260 if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos)) 261 { 262 if (!ASN1_check_infinite_end(&c->p,c->slen)) 263 { 264 c->error=ERR_R_MISSING_ASN1_EOS; 265 return(0); 266 } 267 } 268 if ( ((c->slen != 0) && !(c->inf & 1)) || 269 ((c->slen < 0) && (c->inf & 1))) 270 { 271 c->error=ERR_R_ASN1_LENGTH_MISMATCH; 272 return(0); 273 } 274 return(1); 275 } 276 277int asn1_GetSequence(ASN1_CTX *c, long *length) 278 { 279 unsigned char *q; 280 281 q=c->p; 282 c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass), 283 *length); 284 if (c->inf & 0x80) 285 { 286 c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL; 287 return(0); 288 } 289 if (c->tag != V_ASN1_SEQUENCE) 290 { 291 c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE; 292 return(0); 293 } 294 (*length)-=(c->p-q); 295 if (c->max && (*length < 0)) 296 { 297 c->error=ERR_R_ASN1_LENGTH_MISMATCH; 298 return(0); 299 } 300 if (c->inf == (1|V_ASN1_CONSTRUCTED)) 301 c->slen= *length+ *(c->pp)-c->p; 302 c->eos=0; 303 return(1); 304 } 305 306ASN1_STRING *ASN1_STRING_dup(ASN1_STRING *str) 307 { 308 ASN1_STRING *ret; 309 310 if (str == NULL) return(NULL); 311 if ((ret=ASN1_STRING_type_new(str->type)) == NULL) 312 return(NULL); 313 if (!ASN1_STRING_set(ret,str->data,str->length)) 314 { 315 ASN1_STRING_free(ret); 316 return(NULL); 317 } 318 ret->flags = str->flags; 319 return(ret); 320 } 321 322int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len) 323 { 324 unsigned char *c; 325 const char *data=_data; 326 327 if (len < 0) 328 { 329 if (data == NULL) 330 return(0); 331 else 332 len=strlen(data); 333 } 334 if ((str->length < len) || (str->data == NULL)) 335 { 336 c=str->data; 337 if (c == NULL) 338 str->data=Malloc(len+1); 339 else 340 str->data=Realloc(c,len+1); 341 342 if (str->data == NULL) 343 { 344 str->data=c; 345 return(0); 346 } 347 } 348 str->length=len; 349 if (data != NULL) 350 { 351 memcpy(str->data,data,len); 352 /* an alowance for strings :-) */ 353 str->data[len]='\0'; 354 } 355 return(1); 356 } 357 358ASN1_STRING *ASN1_STRING_new(void) 359 { 360 return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING)); 361 } 362 363 364ASN1_STRING *ASN1_STRING_type_new(int type) 365 { 366 ASN1_STRING *ret; 367 368 ret=(ASN1_STRING *)Malloc(sizeof(ASN1_STRING)); 369 if (ret == NULL) 370 { 371 ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE); 372 return(NULL); 373 } 374 ret->length=0; 375 ret->type=type; 376 ret->data=NULL; 377 ret->flags=0; 378 return(ret); 379 } 380 381void ASN1_STRING_free(ASN1_STRING *a) 382 { 383 if (a == NULL) return; 384 if (a->data != NULL) Free((char *)a->data); 385 Free((char *)a); 386 } 387 388int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b) 389 { 390 int i; 391 392 i=(a->length-b->length); 393 if (i == 0) 394 { 395 i=memcmp(a->data,b->data,a->length); 396 if (i == 0) 397 return(a->type-b->type); 398 else 399 return(i); 400 } 401 else 402 return(i); 403 } 404 405void asn1_add_error(unsigned char *address, int offset) 406 { 407 char buf1[16],buf2[16]; 408 409 sprintf(buf1,"%lu",(unsigned long)address); 410 sprintf(buf2,"%d",offset); 411 ERR_add_error_data(4,"address=",buf1," offset=",buf2); 412 } 413 414