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="ASN1 part of SSLeay 0.9.0b 29-Jun-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 #ifdef undef
 134         fprintf(stderr,"p=%d + *plength=%d > omax=%d + *pp=%d  (%d > %d)\n",
 135                 p,*plength,omax,*pp,(p+ *plength),omax+ *pp);
 136
 137 #endif
 138         if ((p+ *plength) > (omax+ *pp))
 139                 {
 140                 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_TOO_LONG);
 141                 /* Set this so that even if things are not long enough
 142                  * the values are set correctly */
 143                 ret|=0x80;
 144                 }
 145         *pp=p;
 146         return(ret+inf);
 147 err:
 148         ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG);
 149         return(0x80);
 150         }
 151
 152 static int asn1_get_length(pp,inf,rl,max)
 153 unsigned char **pp;
 154 int *inf;
 155 long *rl;
 156 int max;
 157         {
 158         unsigned char *p= *pp;
 159         long ret=0;
 160         int i;
 161
 162         if (max-- < 1) return(0);
 163         if (*p == 0x80)
 164                 {
 165                 *inf=1;
 166                 ret=0;
 167                 p++;
 168                 }
 169         else
 170                 {
 171                 *inf=0;
 172                 i= *p&0x7f;
 173                 if (*(p++) & 0x80)
 174                         {
 175                         if (max-- == 0) return(0);
 176                         while (i-- > 0)
 177                                 {
 178                                 ret<<=8L;
 179                                 ret|= *(p++);
 180                                 if (max-- == 0) return(0);
 181                                 }
 182                         }
 183                 else
 184                         ret=i;
 185                 }
 186         *pp=p;
 187         *rl=ret;
 188         return(1);
 189         }
 190
 191 /* class 0 is constructed
 192  * constructed == 2 for indefinitle length constructed */
 193 void ASN1_put_object(pp,constructed,length,tag,xclass)
 194 unsigned char **pp;
 195 int constructed;
 196 int length;
 197 int tag;
 198 int xclass;
 199         {
 200         unsigned char *p= *pp;
 201         int i;
 202
 203         i=(constructed)?V_ASN1_CONSTRUCTED:0;
 204         i|=(xclass&V_ASN1_PRIVATE);
 205         if (tag < 31)
 206                 *(p++)=i|(tag&V_ASN1_PRIMATIVE_TAG);
 207         else
 208                 {
 209                 *(p++)=i|V_ASN1_PRIMATIVE_TAG;
 210                 while (tag > 0x7f)
 211                         {
 212                         *(p++)=(tag&0x7f)|0x80;
 213                         tag>>=7;
 214                         }
 215                 *(p++)=(tag&0x7f);
 216                 }
 217         if ((constructed == 2) && (length == 0))
 218                 *(p++)=0x80; /* der_put_length would output 0 instead */
 219         else
 220                 asn1_put_length(&p,length);
 221         *pp=p;
 222         }
 223
 224 static void asn1_put_length(pp, length)
 225 unsigned char **pp;
 226 int length;
 227         {
 228         unsigned char *p= *pp;
 229         int i,l;
 230         if (length <= 127)
 231                 *(p++)=(unsigned char)length;
 232         else
 233                 {
 234                 l=length;
 235                 for (i=0; l > 0; i++)
 236                         l>>=8;
 237                 *(p++)=i|0x80;
 238                 l=i;
 239                 while (i-- > 0)
 240                         {
 241                         p[i]=length&0xff;
 242                         length>>=8;
 243                         }
 244                 p+=l;
 245                 }
 246         *pp=p;
 247         }
 248
 249 int ASN1_object_size(constructed, length, tag)
 250 int constructed;
 251 int length;
 252 int tag;
 253         {
 254         int ret;
 255
 256         ret=length;
 257         ret++;
 258         if (tag >= 31)
 259                 {
 260                 while (tag > 0)
 261                         {
 262                         tag>>=7;
 263                         ret++;
 264                         }
 265                 }
 266         if ((length == 0) && (constructed == 2))
 267                 ret+=2;
 268         ret++;
 269         if (length > 127)
 270                 {
 271                 while (length > 0)
 272                         {
 273                         length>>=8;
 274                         ret++;
 275                         }
 276                 }
 277         return(ret);
 278         }
 279
 280 int asn1_Finish(c)
 281 ASN1_CTX *c;
 282         {
 283         if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos))
 284                 {
 285                 if (!ASN1_check_infinite_end(&c->p,c->slen))
 286                         {
 287                         c->error=ASN1_R_MISSING_EOS;
 288                         return(0);
 289                         }
 290                 }
 291         if (    ((c->slen != 0) && !(c->inf & 1)) ||
 292                 ((c->slen < 0) && (c->inf & 1)))
 293                 {
 294                 c->error=ASN1_R_LENGTH_MISMATCH;
 295                 return(0);
 296                 }
 297         return(1);
 298         }
 299
 300 int asn1_GetSequence(c,length)
 301 ASN1_CTX *c;
 302 long *length;
 303         {
 304         unsigned char *q;
 305
 306         q=c->p;
 307         c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass),
 308                 *length);
 309         if (c->inf & 0x80)
 310                 {
 311                 c->error=ASN1_R_BAD_GET_OBJECT;
 312                 return(0);
 313                 }
 314         if (c->tag != V_ASN1_SEQUENCE)
 315                 {
 316                 c->error=ASN1_R_EXPECTING_A_SEQUENCE;
 317                 return(0);
 318                 }
 319         (*length)-=(c->p-q);
 320         if (c->max && (*length < 0))
 321                 {
 322                 c->error=ASN1_R_LENGTH_MISMATCH;
 323                 return(0);
 324                 }
 325         if (c->inf == (1|V_ASN1_CONSTRUCTED))
 326                 c->slen= *length+ *(c->pp)-c->p;
 327         c->eos=0;
 328         return(1);
 329         }
 330
 331 ASN1_STRING *ASN1_STRING_dup(str)
 332 ASN1_STRING *str;
 333         {
 334         ASN1_STRING *ret;
 335
 336         if (str == NULL) return(NULL);
 337         if ((ret=ASN1_STRING_type_new(str->type)) == NULL)
 338                 return(NULL);
 339         if (!ASN1_STRING_set(ret,str->data,str->length))
 340                 {
 341                 ASN1_STRING_free(ret);
 342                 return(NULL);
 343                 }
 344         return(ret);
 345         }
 346
 347 int ASN1_STRING_set(str,data,len)
 348 ASN1_STRING *str;
 349 unsigned char *data;
 350 int len;
 351         {
 352         char *c;
 353
 354         if (len < 0)
 355                 {
 356                 if (data == NULL)
 357                         return(0);
 358                 else
 359                         len=strlen((char *)data);
 360                 }
 361         if ((str->length < len) || (str->data == NULL))
 362                 {
 363                 c=(char *)str->data;
 364                 if (c == NULL)
 365                         str->data=(unsigned char *)Malloc(len+1);
 366                 else
 367                         str->data=(unsigned char *)Realloc(c,len+1);
 368
 369                 if (str->data == NULL)
 370                         {
 371                         str->data=(unsigned char *)c;
 372                         return(0);
 373                         }
 374                 }
 375         str->length=len;
 376         if (data != NULL)
 377                 {
 378                 memcpy(str->data,data,len);
 379                 /* an alowance for strings :-) */
 380                 str->data[len]='\0';
 381                 }
 382         return(1);
 383         }
 384
 385 ASN1_STRING *ASN1_STRING_new()
 386         {
 387         return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
 388         }
 389
 390
 391 ASN1_STRING *ASN1_STRING_type_new(type)
 392 int type;
 393         {
 394         ASN1_STRING *ret;
 395
 396         ret=(ASN1_STRING *)Malloc(sizeof(ASN1_STRING));
 397         if (ret == NULL)
 398                 {
 399                 ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE);
 400                 return(NULL);
 401                 }
 402         ret->length=0;
 403         ret->type=type;
 404         ret->data=NULL;
 405         return(ret);
 406         }
 407
 408 void ASN1_STRING_free(a)
 409 ASN1_STRING *a;
 410         {
 411         if (a == NULL) return;
 412         if (a->data != NULL) Free((char *)a->data);
 413         Free((char *)a);
 414         }
 415
 416 int ASN1_STRING_cmp(a,b)
 417 ASN1_STRING *a,*b;
 418         {
 419         int i;
 420
 421         i=(a->length-b->length);
 422         if (i == 0)
 423                 {
 424                 i=memcmp(a->data,b->data,a->length);
 425                 if (i == 0)
 426                         return(a->type-b->type);
 427                 else
 428                         return(i);
 429                 }
 430         else
 431                 return(i);
 432         }
 433
 434 void asn1_add_error(address,offset)
 435 unsigned char *address;
 436 int offset;
 437         {
 438         char buf1[16],buf2[16];
 439
 440         sprintf(buf1,"%lu",(unsigned long)address);
 441         sprintf(buf2,"%d",offset);
 442         ERR_add_error_data(4,"address=",buf1," offset=",buf2);
 443         }
 444