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 #include <openssl/asn1_mac.h>
  63
  64 static int asn1_get_length(unsigned char **pp,int *inf,long *rl,int max);
  65 static void asn1_put_length(unsigned char **pp, int length);
  66 const char *ASN1_version="ASN.1" OPENSSL_VERSION_PTEXT;
  67
  68 int ASN1_check_infinite_end(unsigned char **p, long len)
  69         {
  70         /* If there is 0 or 1 byte left, the length check should pick
  71          * things up */
  72         if (len <= 0)
  73                 return(1);
  74         else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0))
  75                 {
  76                 (*p)+=2;
  77                 return(1);
  78                 }
  79         return(0);
  80         }
  81
  82
  83 int ASN1_get_object(unsigned char **pp, long *plength, int *ptag, int *pclass,
  84              long omax)
  85         {
  86         int i,ret;
  87         long l;
  88         unsigned char *p= *pp;
  89         int tag,xclass,inf;
  90         long max=omax;
  91
  92         if (!max) goto err;
  93         ret=(*p&V_ASN1_CONSTRUCTED);
  94         xclass=(*p&V_ASN1_PRIVATE);
  95         i= *p&V_ASN1_PRIMITIVE_TAG;
  96         if (i == V_ASN1_PRIMITIVE_TAG)
  97                 {               /* high-tag */
  98                 p++;
  99                 if (--max == 0) goto err;
 100                 l=0;
 101                 while (*p&0x80)
 102                         {
 103                         l<<=7L;
 104                         l|= *(p++)&0x7f;
 105                         if (--max == 0) goto err;
 106                         }
 107                 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);
 138 err:
 139         ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG);
 140         return(0x80);
 141         }
 142
 143 static 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 indefinite length constructed */
 180 void 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
 207 static 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
 230 int 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
 258 int 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
 277 int 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
 306 ASN1_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
 322 int 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=OPENSSL_malloc(len+1);
 339                 else
 340                         str->data=OPENSSL_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 allowance for strings :-) */
 353                 str->data[len]='\0';
 354                 }
 355         return(1);
 356         }
 357
 358 ASN1_STRING *ASN1_STRING_new(void)
 359         {
 360         return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
 361         }
 362
 363
 364 ASN1_STRING *ASN1_STRING_type_new(int type)
 365         {
 366         ASN1_STRING *ret;
 367
 368         ret=(ASN1_STRING *)OPENSSL_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
 381 void ASN1_STRING_free(ASN1_STRING *a)
 382         {
 383         if (a == NULL) return;
 384         if (a->data != NULL) OPENSSL_free(a->data);
 385         OPENSSL_free(a);
 386         }
 387
 388 int 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
 405 void 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 int ASN1_STRING_length(ASN1_STRING *x)
 415 { return M_ASN1_STRING_length(x); }
 416
 417 void ASN1_STRING_length_set(ASN1_STRING *x, int len)
 418 { M_ASN1_STRING_length_set(x, len); return; }
 419
 420 int ASN1_STRING_type(ASN1_STRING *x)
 421 { return M_ASN1_STRING_type(x); }
 422
 423 unsigned char * ASN1_STRING_data(ASN1_STRING *x)
 424 { return M_ASN1_STRING_data(x); }