crypto/asn1/asn1_lib.c

   1 /* crypto/asn1/asn1_lib.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 "asn1.h"
  62 #include "asn1_mac.h"
  63
  64 #ifndef NOPROTO
  65 static int asn1_get_length(unsigned char **pp,int *inf,long *rl,int max);
  66 static void asn1_put_length(unsigned char **pp, int length);
  67 #else
  68 static int asn1_get_length();
  69 static void asn1_put_length();
  70 #endif
  71
  72 char *ASN1_version="ASN.1 part of OpenSSL 0.9.2 31-Dec-1998";
  73
  74 int ASN1_check_infinite_end(p,len)
  75 unsigned char **p;
  76 long len;
  77         {
  78         /* If there is 0 or 1 byte left, the length check should pick
  79          * things up */
  80         if (len <= 0)
  81                 return(1);
  82         else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0))
  83                 {
  84                 (*p)+=2;
  85                 return(1);
  86                 }
  87         return(0);
  88         }
  89
  90
  91 int ASN1_get_object(pp, plength, ptag, pclass, omax)
  92 unsigned char **pp;
  93 long *plength;
  94 int *ptag;
  95 int *pclass;
  96 long omax;
  97         {
  98         int i,ret;
  99         long l;
 100         unsigned char *p= *pp;
 101         int tag,xclass,inf;
 102         long max=omax;
 103
 104         if (!max) goto err;
 105         ret=(*p&V_ASN1_CONSTRUCTED);
 106         xclass=(*p&V_ASN1_PRIVATE);
 107         i= *p&V_ASN1_PRIMATIVE_TAG;
 108         if (i == V_ASN1_PRIMATIVE_TAG)
 109                 {               /* high-tag */
 110                 p++;
 111                 if (--max == 0) goto err;
 112                 l=0;
 113                 while (*p&0x80)
 114                         {
 115                         l<<=7L;
 116                         l|= *(p++)&0x7f;
 117                         if (--max == 0) goto err;
 118                         }
 119                 l<<=7L;
 120                 l|= *(p++)&0x7f;
 121                 tag=(int)l;
 122                 }
 123         else
 124                 {
 125                 tag=i;
 126                 p++;
 127                 if (--max == 0) goto err;
 128                 }
 129         *ptag=tag;
 130         *pclass=xclass;
 131         if (!asn1_get_length(&p,&inf,plength,(int)max)) goto err;
 132
 133 #if 0
 134         fprintf(stderr,"p=%d + *plength=%ld > omax=%ld + *pp=%d  (%d > %d)\n",
 135                 (int)p,*plength,omax,(int)*pp,(int)(p+ *plength),
 136                 (int)(omax+ *pp));
 137
 138 #endif
 139 #if 0
 140         if ((p+ *plength) > (omax+ *pp))
 141                 {
 142                 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_TOO_LONG);
 143                 /* Set this so that even if things are not long enough
 144                  * the values are set correctly */
 145                 ret|=0x80;
 146                 }
 147 #endif
 148         *pp=p;
 149         return(ret|inf);
 150 err:
 151         ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG);
 152         return(0x80);
 153         }
 154
 155 static int asn1_get_length(pp,inf,rl,max)
 156 unsigned char **pp;
 157 int *inf;
 158 long *rl;
 159 int max;
 160         {
 161         unsigned char *p= *pp;
 162         long ret=0;
 163         int i;
 164
 165         if (max-- < 1) return(0);
 166         if (*p == 0x80)
 167                 {
 168                 *inf=1;
 169                 ret=0;
 170                 p++;
 171                 }
 172         else
 173                 {
 174                 *inf=0;
 175                 i= *p&0x7f;
 176                 if (*(p++) & 0x80)
 177                         {
 178                         if (max-- == 0) return(0);
 179                         while (i-- > 0)
 180                                 {
 181                                 ret<<=8L;
 182                                 ret|= *(p++);
 183                                 if (max-- == 0) return(0);
 184                                 }
 185                         }
 186                 else
 187                         ret=i;
 188                 }
 189         *pp=p;
 190         *rl=ret;
 191         return(1);
 192         }
 193
 194 /* class 0 is constructed
 195  * constructed == 2 for indefinitle length constructed */
 196 void ASN1_put_object(pp,constructed,length,tag,xclass)
 197 unsigned char **pp;
 198 int constructed;
 199 int length;
 200 int tag;
 201 int xclass;
 202         {
 203         unsigned char *p= *pp;
 204         int i;
 205
 206         i=(constructed)?V_ASN1_CONSTRUCTED:0;
 207         i|=(xclass&V_ASN1_PRIVATE);
 208         if (tag < 31)
 209                 *(p++)=i|(tag&V_ASN1_PRIMATIVE_TAG);
 210         else
 211                 {
 212                 *(p++)=i|V_ASN1_PRIMATIVE_TAG;
 213                 while (tag > 0x7f)
 214                         {
 215                         *(p++)=(tag&0x7f)|0x80;
 216                         tag>>=7;
 217                         }
 218                 *(p++)=(tag&0x7f);
 219                 }
 220         if ((constructed == 2) && (length == 0))
 221                 *(p++)=0x80; /* der_put_length would output 0 instead */
 222         else
 223                 asn1_put_length(&p,length);
 224         *pp=p;
 225         }
 226
 227 static void asn1_put_length(pp, length)
 228 unsigned char **pp;
 229 int length;
 230         {
 231         unsigned char *p= *pp;
 232         int i,l;
 233         if (length <= 127)
 234                 *(p++)=(unsigned char)length;
 235         else
 236                 {
 237                 l=length;
 238                 for (i=0; l > 0; i++)
 239                         l>>=8;
 240                 *(p++)=i|0x80;
 241                 l=i;
 242                 while (i-- > 0)
 243                         {
 244                         p[i]=length&0xff;
 245                         length>>=8;
 246                         }
 247                 p+=l;
 248                 }
 249         *pp=p;
 250         }
 251
 252 int ASN1_object_size(constructed, length, tag)
 253 int constructed;
 254 int length;
 255 int tag;
 256         {
 257         int ret;
 258
 259         ret=length;
 260         ret++;
 261         if (tag >= 31)
 262                 {
 263                 while (tag > 0)
 264                         {
 265                         tag>>=7;
 266                         ret++;
 267                         }
 268                 }
 269         if ((length == 0) && (constructed == 2))
 270                 ret+=2;
 271         ret++;
 272         if (length > 127)
 273                 {
 274                 while (length > 0)
 275                         {
 276                         length>>=8;
 277                         ret++;
 278                         }
 279                 }
 280         return(ret);
 281         }
 282
 283 int asn1_Finish(c)
 284 ASN1_CTX *c;
 285         {
 286         if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos))
 287                 {
 288                 if (!ASN1_check_infinite_end(&c->p,c->slen))
 289                         {
 290                         c->error=ERR_R_MISSING_ASN1_EOS;
 291                         return(0);
 292                         }
 293                 }
 294         if (    ((c->slen != 0) && !(c->inf & 1)) ||
 295                 ((c->slen < 0) && (c->inf & 1)))
 296                 {
 297                 c->error=ERR_R_ASN1_LENGTH_MISMATCH;
 298                 return(0);
 299                 }
 300         return(1);
 301         }
 302
 303 int asn1_GetSequence(c,length)
 304 ASN1_CTX *c;
 305 long *length;
 306         {
 307         unsigned char *q;
 308
 309         q=c->p;
 310         c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass),
 311                 *length);
 312         if (c->inf & 0x80)
 313                 {
 314                 c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL;
 315                 return(0);
 316                 }
 317         if (c->tag != V_ASN1_SEQUENCE)
 318                 {
 319                 c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
 320                 return(0);
 321                 }
 322         (*length)-=(c->p-q);
 323         if (c->max && (*length < 0))
 324                 {
 325                 c->error=ERR_R_ASN1_LENGTH_MISMATCH;
 326                 return(0);
 327                 }
 328         if (c->inf == (1|V_ASN1_CONSTRUCTED))
 329                 c->slen= *length+ *(c->pp)-c->p;
 330         c->eos=0;
 331         return(1);
 332         }
 333
 334 ASN1_STRING *ASN1_STRING_dup(str)
 335 ASN1_STRING *str;
 336         {
 337         ASN1_STRING *ret;
 338
 339         if (str == NULL) return(NULL);
 340         if ((ret=ASN1_STRING_type_new(str->type)) == NULL)
 341                 return(NULL);
 342         if (!ASN1_STRING_set(ret,str->data,str->length))
 343                 {
 344                 ASN1_STRING_free(ret);
 345                 return(NULL);
 346                 }
 347         return(ret);
 348         }
 349
 350 int ASN1_STRING_set(str,data,len)
 351 ASN1_STRING *str;
 352 unsigned char *data;
 353 int len;
 354         {
 355         char *c;
 356
 357         if (len < 0)
 358                 {
 359                 if (data == NULL)
 360                         return(0);
 361                 else
 362                         len=strlen((char *)data);
 363                 }
 364         if ((str->length < len) || (str->data == NULL))
 365                 {
 366                 c=(char *)str->data;
 367                 if (c == NULL)
 368                         str->data=(unsigned char *)Malloc(len+1);
 369                 else
 370                         str->data=(unsigned char *)Realloc(c,len+1);
 371
 372                 if (str->data == NULL)
 373                         {
 374                         str->data=(unsigned char *)c;
 375                         return(0);
 376                         }
 377                 }
 378         str->length=len;
 379         if (data != NULL)
 380                 {
 381                 memcpy(str->data,data,len);
 382                 /* an alowance for strings :-) */
 383                 str->data[len]='\0';
 384                 }
 385         return(1);
 386         }
 387
 388 ASN1_STRING *ASN1_STRING_new()
 389         {
 390         return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
 391         }
 392
 393
 394 ASN1_STRING *ASN1_STRING_type_new(type)
 395 int type;
 396         {
 397         ASN1_STRING *ret;
 398
 399         ret=(ASN1_STRING *)Malloc(sizeof(ASN1_STRING));
 400         if (ret == NULL)
 401                 {
 402                 ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE);
 403                 return(NULL);
 404                 }
 405         ret->length=0;
 406         ret->type=type;
 407         ret->data=NULL;
 408         ret->flags=0;
 409         return(ret);
 410         }
 411
 412 void ASN1_STRING_free(a)
 413 ASN1_STRING *a;
 414         {
 415         if (a == NULL) return;
 416         if (a->data != NULL) Free((char *)a->data);
 417         Free((char *)a);
 418         }
 419
 420 int ASN1_STRING_cmp(a,b)
 421 ASN1_STRING *a,*b;
 422         {
 423         int i;
 424
 425         i=(a->length-b->length);
 426         if (i == 0)
 427                 {
 428                 i=memcmp(a->data,b->data,a->length);
 429                 if (i == 0)
 430                         return(a->type-b->type);
 431                 else
 432                         return(i);
 433                 }
 434         else
 435                 return(i);
 436         }
 437
 438 void asn1_add_error(address,offset)
 439 unsigned char *address;
 440 int offset;
 441         {
 442         char buf1[16],buf2[16];
 443
 444         sprintf(buf1,"%lu",(unsigned long)address);
 445         sprintf(buf2,"%d",offset);
 446         ERR_add_error_data(4,"address=",buf1," offset=",buf2);
 447         }
 448