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 <openssl/asn1.h>
  62
  63 static int asn1_get_length(unsigned char **pp,int *inf,long *rl,int max);
  64 static void asn1_put_length(unsigned char **pp, int length);
  65 const char *ASN1_version="ASN.1" OPENSSL_VERSION_PTEXT;
  66
  67 int ASN1_check_infinite_end(unsigned char **p, long len)
  68         {
  69         /* If there is 0 or 1 byte left, the length check should pick
  70          * things up */
  71         if (len <= 0)
  72                 return(1);
  73         else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0))
  74                 {
  75                 (*p)+=2;
  76                 return(1);
  77                 }
  78         return(0);
  79         }
  80
  81
  82 int ASN1_get_object(unsigned char **pp, long *plength, int *ptag, int *pclass,
  83              long omax)
  84         {
  85         int i,ret;
  86         long l;
  87         unsigned char *p= *pp;
  88         int tag,xclass,inf;
  89         long max=omax;
  90
  91         if (!max) goto err;
  92         ret=(*p&V_ASN1_CONSTRUCTED);
  93         xclass=(*p&V_ASN1_PRIVATE);
  94         i= *p&V_ASN1_PRIMITIVE_TAG;
  95         if (i == V_ASN1_PRIMITIVE_TAG)
  96                 {               /* high-tag */
  97                 p++;
  98                 if (--max == 0) goto err;
  99                 l=0;
 100                 while (*p&0x80)
 101                         {
 102                         l<<=7L;
 103                         l|= *(p++)&0x7f;
 104                         if (--max == 0) goto err;
 105                         }
 106                 l<<=7L;
 107                 l|= *(p++)&0x7f;
 108                 tag=(int)l;
 109                 }
 110         else
 111                 {
 112                 tag=i;
 113                 p++;
 114                 if (--max == 0) goto err;
 115                 }
 116         *ptag=tag;
 117         *pclass=xclass;
 118         if (!asn1_get_length(&p,&inf,plength,(int)max)) goto err;
 119
 120 #if 0
 121         fprintf(stderr,"p=%d + *plength=%ld > omax=%ld + *pp=%d  (%d > %d)\n",
 122                 (int)p,*plength,omax,(int)*pp,(int)(p+ *plength),
 123                 (int)(omax+ *pp));
 124
 125 #endif
 126 #if 0
 127         if ((p+ *plength) > (omax+ *pp))
 128                 {
 129                 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_TOO_LONG);
 130                 /* Set this so that even if things are not long enough
 131                  * the values are set correctly */
 132                 ret|=0x80;
 133                 }
 134 #endif
 135         *pp=p;
 136         return(ret|inf);
 137 err:
 138         ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG);
 139         return(0x80);
 140         }
 141
 142 static int asn1_get_length(unsigned char **pp, int *inf, long *rl, int max)
 143         {
 144         unsigned char *p= *pp;
 145         long ret=0;
 146         int i;
 147
 148         if (max-- < 1) return(0);
 149         if (*p == 0x80)
 150                 {
 151                 *inf=1;
 152                 ret=0;
 153                 p++;
 154                 }
 155         else
 156                 {
 157                 *inf=0;
 158                 i= *p&0x7f;
 159                 if (*(p++) & 0x80)
 160                         {
 161                         if (max-- == 0) return(0);
 162                         while (i-- > 0)
 163                                 {
 164                                 ret<<=8L;
 165                                 ret|= *(p++);
 166                                 if (max-- == 0) return(0);
 167                                 }
 168                         }
 169                 else
 170                         ret=i;
 171                 }
 172         *pp=p;
 173         *rl=ret;
 174         return(1);
 175         }
 176
 177 /* class 0 is constructed
 178  * constructed == 2 for indefinite length constructed */
 179 void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
 180              int xclass)
 181         {
 182         unsigned char *p= *pp;
 183         int i, ttag;
 184
 185         i=(constructed)?V_ASN1_CONSTRUCTED:0;
 186         i|=(xclass&V_ASN1_PRIVATE);
 187         if (tag < 31)
 188                 *(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG);
 189         else
 190                 {
 191                 *(p++)=i|V_ASN1_PRIMITIVE_TAG;
 192                 for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7;
 193                 ttag = i;
 194                 while(i-- > 0)
 195                         {
 196                         p[i] = tag & 0x7f;
 197                         if(i != (ttag - 1)) p[i] |= 0x80;
 198                         tag >>= 7;
 199                         }
 200                 p += ttag;
 201                 }
 202         if ((constructed == 2) && (length == 0))
 203                 *(p++)=0x80; /* der_put_length would output 0 instead */
 204         else
 205                 asn1_put_length(&p,length);
 206         *pp=p;
 207         }
 208
 209 static void asn1_put_length(unsigned char **pp, int length)
 210         {
 211         unsigned char *p= *pp;
 212         int i,l;
 213         if (length <= 127)
 214                 *(p++)=(unsigned char)length;
 215         else
 216                 {
 217                 l=length;
 218                 for (i=0; l > 0; i++)
 219                         l>>=8;
 220                 *(p++)=i|0x80;
 221                 l=i;
 222                 while (i-- > 0)
 223                         {
 224                         p[i]=length&0xff;
 225                         length>>=8;
 226                         }
 227                 p+=l;
 228                 }
 229         *pp=p;
 230         }
 231
 232 int ASN1_object_size(int constructed, int length, int tag)
 233         {
 234         int ret;
 235
 236         ret=length;
 237         ret++;
 238         if (tag >= 31)
 239                 {
 240                 while (tag > 0)
 241                         {
 242                         tag>>=7;
 243                         ret++;
 244                         }
 245                 }
 246         if ((length == 0) && (constructed == 2))
 247                 ret+=2;
 248         ret++;
 249         if (length > 127)
 250                 {
 251                 while (length > 0)
 252                         {
 253                         length>>=8;
 254                         ret++;
 255                         }
 256                 }
 257         return(ret);
 258         }
 259
 260 int asn1_Finish(ASN1_CTX *c)
 261         {
 262         if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos))
 263                 {
 264                 if (!ASN1_check_infinite_end(&c->p,c->slen))
 265                         {
 266                         c->error=ERR_R_MISSING_ASN1_EOS;
 267                         return(0);
 268                         }
 269                 }
 270         if (    ((c->slen != 0) && !(c->inf & 1)) ||
 271                 ((c->slen < 0) && (c->inf & 1)))
 272                 {
 273                 c->error=ERR_R_ASN1_LENGTH_MISMATCH;
 274                 return(0);
 275                 }
 276         return(1);
 277         }
 278
 279 int asn1_GetSequence(ASN1_CTX *c, long *length)
 280         {
 281         unsigned char *q;
 282
 283         q=c->p;
 284         c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass),
 285                 *length);
 286         if (c->inf & 0x80)
 287                 {
 288                 c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL;
 289                 return(0);
 290                 }
 291         if (c->tag != V_ASN1_SEQUENCE)
 292                 {
 293                 c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
 294                 return(0);
 295                 }
 296         (*length)-=(c->p-q);
 297         if (c->max && (*length < 0))
 298                 {
 299                 c->error=ERR_R_ASN1_LENGTH_MISMATCH;
 300                 return(0);
 301                 }
 302         if (c->inf == (1|V_ASN1_CONSTRUCTED))
 303                 c->slen= *length+ *(c->pp)-c->p;
 304         c->eos=0;
 305         return(1);
 306         }
 307
 308 ASN1_STRING *ASN1_STRING_dup(ASN1_STRING *str)
 309         {
 310         ASN1_STRING *ret;
 311
 312         if (str == NULL) return(NULL);
 313         if ((ret=ASN1_STRING_type_new(str->type)) == NULL)
 314                 return(NULL);
 315         if (!ASN1_STRING_set(ret,str->data,str->length))
 316                 {
 317                 ASN1_STRING_free(ret);
 318                 return(NULL);
 319                 }
 320         ret->flags = str->flags;
 321         return(ret);
 322         }
 323
 324 int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
 325         {
 326         unsigned char *c;
 327         const char *data=_data;
 328
 329         if (len < 0)
 330                 {
 331                 if (data == NULL)
 332                         return(0);
 333                 else
 334                         len=strlen(data);
 335                 }
 336         if ((str->length < len) || (str->data == NULL))
 337                 {
 338                 c=str->data;
 339                 if (c == NULL)
 340                         str->data=OPENSSL_malloc(len+1);
 341                 else
 342                         str->data=OPENSSL_realloc(c,len+1);
 343
 344                 if (str->data == NULL)
 345                         {
 346                         str->data=c;
 347                         return(0);
 348                         }
 349                 }
 350         str->length=len;
 351         if (data != NULL)
 352                 {
 353                 memcpy(str->data,data,len);
 354                 /* an allowance for strings :-) */
 355                 str->data[len]='\0';
 356                 }
 357         return(1);
 358         }
 359
 360 ASN1_STRING *ASN1_STRING_new(void)
 361         {
 362         return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
 363         }
 364
 365
 366 ASN1_STRING *ASN1_STRING_type_new(int type)
 367         {
 368         ASN1_STRING *ret;
 369
 370         ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
 371         if (ret == NULL)
 372                 {
 373                 ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE);
 374                 return(NULL);
 375                 }
 376         ret->length=0;
 377         ret->type=type;
 378         ret->data=NULL;
 379         ret->flags=0;
 380         return(ret);
 381         }
 382
 383 void ASN1_STRING_free(ASN1_STRING *a)
 384         {
 385         if (a == NULL) return;
 386         if (a->data != NULL) OPENSSL_free(a->data);
 387         OPENSSL_free(a);
 388         }
 389
 390 int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b)
 391         {
 392         int i;
 393
 394         i=(a->length-b->length);
 395         if (i == 0)
 396                 {
 397                 i=memcmp(a->data,b->data,a->length);
 398                 if (i == 0)
 399                         return(a->type-b->type);
 400                 else
 401                         return(i);
 402                 }
 403         else
 404                 return(i);
 405         }
 406
 407 void asn1_add_error(unsigned char *address, int offset)
 408         {
 409         char buf1[16],buf2[16];
 410
 411         sprintf(buf1,"%lu",(unsigned long)address);
 412         sprintf(buf2,"%d",offset);
 413         ERR_add_error_data(4,"address=",buf1," offset=",buf2);
 414         }
 415
 416 int ASN1_STRING_length(ASN1_STRING *x)
 417 { return M_ASN1_STRING_length(x); }
 418
 419 void ASN1_STRING_length_set(ASN1_STRING *x, int len)
 420 { M_ASN1_STRING_length_set(x, len); return; }
 421
 422 int ASN1_STRING_type(ASN1_STRING *x)
 423 { return M_ASN1_STRING_type(x); }
 424
 425 unsigned char * ASN1_STRING_data(ASN1_STRING *x)
 426 { return M_ASN1_STRING_data(x); }