lib/element.c

   1 /*
   2  *      Copyright (C) 2004, 2006 Free Software Foundation
   3  *      Copyright (C) 2000, 2001, 2002, 2003 Fabio Fiorina
   4  *
   5  * This file is part of LIBTASN1.
   6  *
   7  * The LIBTASN1 library is free software; you can redistribute it
   8  * and/or modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20  * 02110-1301, USA
  21  */
  22
  23 /*****************************************************/
  24 /* File: element.c                                   */
  25 /* Description: Functions with the read and write    */
  26 /*   functions.                                      */
  27 /*****************************************************/
  28
  29
  30 #include <int.h>
  31 #include <errors.h>
  32 #include "parser_aux.h"
  33 #include <gstr.h>
  34 #include "structure.h"
  35
  36 void
  37 _asn1_hierarchical_name(node_asn *node,char *name,int name_size)
  38 {
  39   node_asn *p;
  40   char tmp_name[64];
  41
  42   p=node;
  43
  44   name[0]=0;
  45
  46   while(p != NULL){
  47     if(p->name != NULL){
  48       _asn1_str_cpy(tmp_name,sizeof(tmp_name),name),
  49
  50       _asn1_str_cpy(name,name_size,p->name);
  51       _asn1_str_cat(name,name_size,".");
  52       _asn1_str_cat(name,name_size,tmp_name);
  53     }
  54     p=_asn1_find_up(p);
  55   }
  56
  57   if(name[0]==0) _asn1_str_cpy(name,name_size,"ROOT");
  58 }
  59
  60
  61 /******************************************************************/
  62 /* Function : _asn1_convert_integer                               */
  63 /* Description: converts an integer from a null terminated string */
  64 /*              to der decoding. The convertion from a null       */
  65 /*              terminated string to an integer is made with      */
  66 /*              the 'strtol' function.                            */
  67 /* Parameters:                                                    */
  68 /*   value: null terminated string to convert.                    */
  69 /*   value_out: convertion result (memory must be already         */
  70 /*              allocated).                                       */
  71 /*   value_out_size: number of bytes of value_out.                */
  72 /*   len: number of significant byte of value_out.                */
  73 /* Return: ASN1_MEM_ERROR or ASN1_SUCCESS                         */
  74 /******************************************************************/
  75 asn1_retCode
  76 _asn1_convert_integer(const char *value,unsigned char *value_out,int value_out_size, int *len)
  77 {
  78   char negative;
  79   unsigned char val[SIZEOF_UNSIGNED_LONG_INT];
  80   long valtmp;
  81   int k,k2;
  82
  83   valtmp=strtol(value,NULL,10);
  84
  85   for(k=0;k<SIZEOF_UNSIGNED_LONG_INT;k++){
  86     val[SIZEOF_UNSIGNED_LONG_INT-k-1]=(valtmp >> (8*k)) & 0xFF;
  87   }
  88
  89   if(val[0]&0x80) negative=1;
  90   else negative=0;
  91
  92   for(k=0;k<SIZEOF_UNSIGNED_LONG_INT-1;k++){
  93     if(negative && (val[k]!=0xFF)) break;
  94     else if(!negative && val[k]) break;
  95   }
  96
  97   if((negative && !(val[k]&0x80)) ||
  98      (!negative && (val[k]&0x80))) k--;
  99
 100   *len=SIZEOF_UNSIGNED_LONG_INT-k;
 101
 102   if (SIZEOF_UNSIGNED_LONG_INT-k> value_out_size)
 103     /* VALUE_OUT is too short to contain the value conversion */
 104     return ASN1_MEM_ERROR;
 105
 106   for(k2=k;k2<SIZEOF_UNSIGNED_LONG_INT;k2++)
 107     value_out[k2-k]=val[k2];
 108
 109
 110 #ifdef LIBTASN1_DEBUG_INTEGER
 111   _libtasn1_log("_asn1_convert_integer: valueIn=%s, lenOut=%d",value,*len);
 112   for(k=0;k<SIZEOF_UNSIGNED_LONG_INT;k++)
 113     _libtasn1_log(", vOut[%d]=%d",k,value_out[k]);
 114   _libtasn1_log("\n");
 115 #endif
 116
 117
 118   return ASN1_SUCCESS;
 119 }
 120
 121
 122 int
 123 _asn1_append_sequence_set(node_asn *node)
 124 {
 125   node_asn *p,*p2;
 126   char temp[10];
 127   long n;
 128
 129   if(!node || !(node->down)) return ASN1_GENERIC_ERROR;
 130
 131   p=node->down;
 132   while((type_field(p->type)==TYPE_TAG) || (type_field(p->type)==TYPE_SIZE)) p=p->right;
 133   p2=_asn1_copy_structure3(p);
 134   while(p->right) p=p->right;
 135   _asn1_set_right(p,p2);
 136
 137   if(p->name==NULL) _asn1_str_cpy(temp,sizeof(temp),"?1");
 138   else{
 139     n=strtol(p->name+1,NULL,0);
 140     n++;
 141     temp[0]='?';
 142     _asn1_ltostr(n,temp+1);
 143   }
 144   _asn1_set_name(p2,temp);
 145   /*  p2->type |= CONST_OPTION; */
 146
 147   return ASN1_SUCCESS;
 148 }
 149
 150
 151 /**
 152   * asn1_write_value - Set the value of one element inside a structure.
 153   * @node_root: pointer to a structure
 154   * @name: the name of the element inside the structure that you want to set.
 155   * @ivalue: vector used to specify the value to set. If len is >0,
 156   *   VALUE must be a two's complement form integer.  if len=0 *VALUE
 157   *   must be a null terminated string with an integer value.
 158   * @len: number of bytes of *value to use to set the value:
 159   *   value[0]..value[len-1] or 0 if value is a null terminated string
 160   *
 161   * Set the value of one element inside a structure.
 162   *
 163   * If an element is OPTIONAL and you want to delete it, you must use
 164   * the value=NULL and len=0.  Using "pkix.asn":
 165   *
 166   * result=asn1_write_value(cert, "tbsCertificate.issuerUniqueID",
 167   * NULL, 0);
 168   *
 169   * Description for each type:
 170   *
 171   * INTEGER: VALUE must contain a two's complement form integer.
 172   *
 173   *            value[0]=0xFF ,               len=1 -> integer=-1.
 174   *            value[0]=0xFF value[1]=0xFF , len=2 -> integer=-1.
 175   *            value[0]=0x01 ,               len=1 -> integer= 1.
 176   *            value[0]=0x00 value[1]=0x01 , len=2 -> integer= 1.
 177   *            value="123"                 , len=0 -> integer= 123.
 178   *
 179   * ENUMERATED: As INTEGER (but only with not negative numbers).
 180   *
 181   * BOOLEAN: VALUE must be the null terminated string "TRUE" or
 182   *   "FALSE" and LEN != 0.
 183   *
 184   *            value="TRUE" , len=1 -> boolean=TRUE.
 185   *            value="FALSE" , len=1 -> boolean=FALSE.
 186   *
 187   * OBJECT IDENTIFIER: VALUE must be a null terminated string with
 188   *   each number separated by a dot (e.g. "1.2.3.543.1").  LEN != 0.
 189   *
 190   *            value="1 2 840 10040 4 3" , len=1 -> OID=dsa-with-sha.
 191   *
 192   * UTCTime: VALUE must be a null terminated string in one of these
 193   *   formats: "YYMMDDhhmmssZ", "YYMMDDhhmmssZ",
 194   *   "YYMMDDhhmmss+hh'mm'", "YYMMDDhhmmss-hh'mm'",
 195   *   "YYMMDDhhmm+hh'mm'", or "YYMMDDhhmm-hh'mm'".  LEN != 0.
 196   *
 197   *            value="9801011200Z" , len=1 -> time=Jannuary 1st, 1998
 198   *            at 12h 00m Greenwich Mean Time
 199   *
 200   * GeneralizedTime: VALUE must be in one of this format:
 201   *   "YYYYMMDDhhmmss.sZ", "YYYYMMDDhhmmss.sZ",
 202   *   "YYYYMMDDhhmmss.s+hh'mm'", "YYYYMMDDhhmmss.s-hh'mm'",
 203   *   "YYYYMMDDhhmm+hh'mm'", or "YYYYMMDDhhmm-hh'mm'" where ss.s
 204   *   indicates the seconds with any precision like "10.1" or "01.02".
 205   *   LEN != 0
 206   *
 207   *            value="2001010112001.12-0700" , len=1 -> time=Jannuary
 208   *            1st, 2001 at 12h 00m 01.12s Pacific Daylight Time
 209   *
 210   * OCTET STRING: VALUE contains the octet string and LEN is the
 211   *   number of octets.
 212   *
 213   *            value="$\backslash$x01$\backslash$x02$\backslash$x03" ,
 214   *            len=3 -> three bytes octet string
 215   *
 216   * GeneralString: VALUE contains the generalstring and LEN is the
 217   *   number of octets.
 218   *
 219   *            value="$\backslash$x01$\backslash$x02$\backslash$x03" ,
 220   *            len=3 -> three bytes generalstring
 221   *
 222   * BIT STRING: VALUE contains the bit string organized by bytes and
 223   *   LEN is the number of bits.
 224   *
 225   *   value="$\backslash$xCF" , len=6 -> bit string="110011" (six
 226   *   bits)
 227   *
 228   * CHOICE: if NAME indicates a choice type, VALUE must specify one of
 229   *   the alternatives with a null terminated string. LEN != 0. Using
 230   *   "pkix.asn"\:
 231   *
 232   *           result=asn1_write_value(cert,
 233   *           "certificate1.tbsCertificate.subject", "rdnSequence",
 234   *           1);
 235   *
 236   * ANY: VALUE indicates the der encoding of a structure.  LEN != 0.
 237   *
 238   * SEQUENCE OF: VALUE must be the null terminated string "NEW" and
 239   *   LEN != 0. With this instruction another element is appended in
 240   *   the sequence. The name of this element will be "?1" if it's the
 241   *   first one, "?2" for the second and so on.
 242   *
 243   *   Using "pkix.asn"\:
 244   *
 245   *   result=asn1_write_value(cert,
 246   *   "certificate1.tbsCertificate.subject.rdnSequence", "NEW", 1);
 247   *
 248   * SET OF: the same as SEQUENCE OF.  Using "pkix.asn":
 249   *
 250   *           result=asn1_write_value(cert,
 251   *           "tbsCertificate.subject.rdnSequence.?LAST", "NEW", 1);
 252   *
 253   * Returns:
 254   *
 255   *   ASN1_SUCCESS: Set value OK.
 256   *
 257   *   ASN1_ELEMENT_NOT_FOUND: NAME is not a valid element.
 258   *
 259   *   ASN1_VALUE_NOT_VALID: VALUE has a wrong format.
 260   *
 261   **/
 262 asn1_retCode
 263 asn1_write_value(ASN1_TYPE node_root,const char *name,
 264                  const void *ivalue,int len)
 265 {
 266   node_asn *node,*p,*p2;
 267   unsigned char *temp,*value_temp=NULL,*default_temp=NULL;
 268   int len2,k,k2,negative;
 269   const unsigned char* value = ivalue;
 270
 271   node=asn1_find_node(node_root,name);
 272   if(node==NULL) return  ASN1_ELEMENT_NOT_FOUND;
 273
 274   if((node->type & CONST_OPTION) && (value==NULL) && (len==0)){
 275     asn1_delete_structure(&node);
 276     return ASN1_SUCCESS;
 277   }
 278
 279   if((type_field(node->type) == TYPE_SEQUENCE_OF) && (value == NULL) && (len==0)){
 280     p=node->down;
 281     while((type_field(p->type)==TYPE_TAG) || (type_field(p->type)==TYPE_SIZE)) p=p->right;
 282
 283     while(p->right)
 284       asn1_delete_structure(&p->right);
 285
 286     return ASN1_SUCCESS;
 287   }
 288
 289   switch(type_field(node->type)){
 290   case TYPE_BOOLEAN:
 291     if(!strcmp(value,"TRUE")){
 292       if(node->type&CONST_DEFAULT){
 293         p=node->down;
 294         while(type_field(p->type)!=TYPE_DEFAULT) p=p->right;
 295         if(p->type&CONST_TRUE) _asn1_set_value(node,NULL,0);
 296         else _asn1_set_value(node,"T",1);
 297       }
 298       else _asn1_set_value(node,"T",1);
 299     }
 300     else if(!strcmp(value,"FALSE")){
 301       if(node->type&CONST_DEFAULT){
 302         p=node->down;
 303         while(type_field(p->type)!=TYPE_DEFAULT) p=p->right;
 304         if(p->type&CONST_FALSE) _asn1_set_value(node,NULL,0);
 305         else _asn1_set_value(node,"F",1);
 306       }
 307       else _asn1_set_value(node,"F",1);
 308     }
 309     else return ASN1_VALUE_NOT_VALID;
 310     break;
 311   case TYPE_INTEGER: case TYPE_ENUMERATED:
 312     if(len==0){
 313       if((isdigit(value[0])) || (value[0]=='-')){
 314         value_temp=(unsigned char *)_asn1_alloca(SIZEOF_UNSIGNED_LONG_INT);
 315         if (value_temp==NULL) return ASN1_MEM_ALLOC_ERROR;
 316
 317         _asn1_convert_integer(value,value_temp,SIZEOF_UNSIGNED_LONG_INT, &len);
 318       }
 319       else{ /* is an identifier like v1 */
 320         if(!(node->type&CONST_LIST)) return ASN1_VALUE_NOT_VALID;
 321         p=node->down;
 322         while(p){
 323           if(type_field(p->type)==TYPE_CONSTANT){
 324             if((p->name) && (!strcmp(p->name,value))){
 325               value_temp=(unsigned char *)_asn1_alloca(SIZEOF_UNSIGNED_LONG_INT);
 326               if (value_temp==NULL) return ASN1_MEM_ALLOC_ERROR;
 327
 328               _asn1_convert_integer(p->value,value_temp,SIZEOF_UNSIGNED_LONG_INT, &len);
 329               break;
 330             }
 331           }
 332           p=p->right;
 333         }
 334         if(p==NULL) return ASN1_VALUE_NOT_VALID;
 335       }
 336     }
 337     else{ /* len != 0 */
 338       value_temp=(unsigned char *)_asn1_alloca(len);
 339       if (value_temp==NULL) return ASN1_MEM_ALLOC_ERROR;
 340       memcpy(value_temp,value,len);
 341     }
 342
 343
 344     if(value_temp[0]&0x80) negative=1;
 345     else negative=0;
 346
 347     if(negative && (type_field(node->type)==TYPE_ENUMERATED))
 348       {_asn1_afree(value_temp);return ASN1_VALUE_NOT_VALID;}
 349
 350     for(k=0;k<len-1;k++)
 351       if(negative && (value_temp[k]!=0xFF)) break;
 352       else if(!negative && value_temp[k]) break;
 353
 354     if((negative && !(value_temp[k]&0x80)) ||
 355        (!negative && (value_temp[k]&0x80))) k--;
 356
 357     asn1_length_der(len-k,NULL,&len2);
 358     temp=(unsigned char *)_asn1_alloca(len-k+len2);
 359     if (temp==NULL) return ASN1_MEM_ALLOC_ERROR;
 360
 361     asn1_octet_der(value_temp+k,len-k,temp,&len2);
 362     _asn1_set_value(node,temp,len2);
 363
 364     _asn1_afree(temp);
 365
 366
 367     if(node->type&CONST_DEFAULT){
 368       p=node->down;
 369       while(type_field(p->type)!=TYPE_DEFAULT) p=p->right;
 370       if((isdigit(p->value[0])) || (p->value[0]=='-')){
 371         default_temp=(unsigned char *)_asn1_alloca(SIZEOF_UNSIGNED_LONG_INT);
 372         if (default_temp==NULL) return ASN1_MEM_ALLOC_ERROR;
 373
 374         _asn1_convert_integer(p->value,default_temp,SIZEOF_UNSIGNED_LONG_INT,&len2);
 375       }
 376       else{ /* is an identifier like v1 */
 377         if(!(node->type&CONST_LIST)) return ASN1_VALUE_NOT_VALID;
 378         p2=node->down;
 379         while(p2){
 380           if(type_field(p2->type)==TYPE_CONSTANT){
 381             if((p2->name) && (!strcmp(p2->name,p->value))){
 382               default_temp=(unsigned char *)_asn1_alloca(SIZEOF_UNSIGNED_LONG_INT);
 383               if (default_temp==NULL) return ASN1_MEM_ALLOC_ERROR;
 384
 385               _asn1_convert_integer(p2->value,default_temp,SIZEOF_UNSIGNED_LONG_INT,&len2);
 386               break;
 387             }
 388           }
 389           p2=p2->right;
 390         }
 391         if(p2==NULL) return ASN1_VALUE_NOT_VALID;
 392       }
 393
 394
 395       if((len-k)==len2){
 396         for(k2=0;k2<len2;k2++)
 397           if(value_temp[k+k2]!=default_temp[k2]){
 398             break;
 399           }
 400         if(k2==len2) _asn1_set_value(node,NULL,0);
 401       }
 402       _asn1_afree(default_temp);
 403     }
 404     _asn1_afree(value_temp);
 405     break;
 406   case TYPE_OBJECT_ID:
 407     for(k=0;k<strlen(value);k++)
 408       if((!isdigit(value[k])) && (value[k]!='.') && (value[k]!='+'))
 409         return ASN1_VALUE_NOT_VALID;
 410     if(node->type&CONST_DEFAULT){
 411       p=node->down;
 412       while(type_field(p->type)!=TYPE_DEFAULT) p=p->right;
 413       if(!strcmp(value,p->value)){
 414         _asn1_set_value(node,NULL,0);
 415         break;
 416       }
 417     }
 418     _asn1_set_value(node,value,strlen(value)+1);
 419     break;
 420   case TYPE_TIME:
 421     if(node->type&CONST_UTC){
 422       if(strlen(value)<11) return ASN1_VALUE_NOT_VALID;
 423       for(k=0;k<10;k++)
 424         if(!isdigit(value[k])) return ASN1_VALUE_NOT_VALID;
 425       switch(strlen(value)){
 426       case 11:
 427       if(value[10]!='Z') return ASN1_VALUE_NOT_VALID;
 428       break;
 429       case 13:
 430         if((!isdigit(value[10])) || (!isdigit(value[11])) ||
 431            (value[12]!='Z')) return ASN1_VALUE_NOT_VALID;
 432         break;
 433       case 15:
 434         if((value[10]!='+') && (value[10]!='-')) return ASN1_VALUE_NOT_VALID;
 435         for(k=11;k<15;k++)
 436           if(!isdigit(value[k])) return ASN1_VALUE_NOT_VALID;
 437         break;
 438       case 17:
 439         if((!isdigit(value[10])) || (!isdigit(value[11])))
 440            return ASN1_VALUE_NOT_VALID;
 441         if((value[12]!='+') && (value[12]!='-')) return ASN1_VALUE_NOT_VALID;
 442         for(k=13;k<17;k++)
 443           if(!isdigit(value[k])) return ASN1_VALUE_NOT_VALID;
 444         break;
 445       default:
 446         return ASN1_VALUE_NOT_FOUND;
 447       }
 448       _asn1_set_value(node,value,strlen(value)+1);
 449     }
 450     else{  /* GENERALIZED TIME */
 451       if(value) _asn1_set_value(node,value,strlen(value)+1);
 452     }
 453     break;
 454   case  TYPE_OCTET_STRING:
 455     if(len==0)
 456       len=strlen(value);
 457     asn1_length_der(len,NULL,&len2);
 458     temp=(unsigned char *)_asn1_alloca(len+len2);
 459     if (temp==NULL) return ASN1_MEM_ALLOC_ERROR;
 460
 461     asn1_octet_der(value,len,temp,&len2);
 462     _asn1_set_value(node,temp,len2);
 463     _asn1_afree(temp);
 464     break;
 465   case  TYPE_GENERALSTRING:
 466     if(len==0)
 467       len=strlen(value);
 468     asn1_length_der(len,NULL,&len2);
 469     temp=(unsigned char *)_asn1_alloca(len+len2);
 470     if (temp==NULL) return ASN1_MEM_ALLOC_ERROR;
 471
 472     asn1_octet_der(value,len,temp,&len2);
 473     _asn1_set_value(node,temp,len2);
 474     _asn1_afree(temp);
 475     break;
 476   case  TYPE_BIT_STRING:
 477     if(len==0)
 478       len=strlen(value);
 479     asn1_length_der((len>>3)+2,NULL,&len2);
 480     temp=(unsigned char *)_asn1_alloca((len>>3)+2+len2);
 481     if (temp==NULL) return ASN1_MEM_ALLOC_ERROR;
 482
 483     asn1_bit_der(value,len,temp,&len2);
 484     _asn1_set_value(node,temp,len2);
 485     _asn1_afree(temp);
 486     break;
 487   case  TYPE_CHOICE:
 488     p=node->down;
 489     while(p){
 490       if(!strcmp(p->name,value)){
 491         p2=node->down;
 492         while(p2){
 493           if(p2!=p){asn1_delete_structure(&p2); p2=node->down;}
 494           else p2=p2->right;
 495         }
 496         break;
 497       }
 498       p=p->right;
 499     }
 500     if(!p) return ASN1_ELEMENT_NOT_FOUND;
 501     break;
 502   case TYPE_ANY:
 503     asn1_length_der(len,NULL,&len2);
 504     temp=(unsigned char *)_asn1_alloca(len+len2);
 505     if (temp==NULL) return ASN1_MEM_ALLOC_ERROR;
 506
 507     asn1_octet_der(value,len,temp,&len2);
 508     _asn1_set_value(node,temp,len2);
 509     _asn1_afree(temp);
 510     break;
 511   case TYPE_SEQUENCE_OF: case TYPE_SET_OF:
 512     if(strcmp(value,"NEW")) return ASN1_VALUE_NOT_VALID;
 513     _asn1_append_sequence_set(node);
 514     break;
 515   default:
 516     return  ASN1_ELEMENT_NOT_FOUND;
 517     break;
 518   }
 519
 520   return ASN1_SUCCESS;
 521 }
 522
 523
 524 #define PUT_VALUE( ptr, ptr_size, data, data_size) \
 525         *len = data_size; \
 526         if (ptr_size < data_size) { \
 527                 return ASN1_MEM_ERROR; \
 528         } else { \
 529                 memcpy( ptr, data, data_size); \
 530         }
 531
 532 #define PUT_STR_VALUE( ptr, ptr_size, data) \
 533         *len = strlen(data) + 1; \
 534         if (ptr_size < *len) { \
 535                 return ASN1_MEM_ERROR; \
 536         } else { \
 537                 /* this strcpy is checked */ \
 538                 strcpy(ptr, data); \
 539         }
 540
 541 #define ADD_STR_VALUE( ptr, ptr_size, data) \
 542         *len = strlen(data) + 1; \
 543         if (ptr_size < strlen(ptr)+(*len)) { \
 544                 return ASN1_MEM_ERROR; \
 545         } else { \
 546                 /* this strcat is checked */ \
 547                 strcat(ptr, data); \
 548         }
 549
 550 /**
 551   * asn1_read_value - Returns the value of one element inside a structure
 552   * @root: pointer to a structure.
 553   * @name: the name of the element inside a structure that you want to read.
 554   * @ivalue: vector that will contain the element's content, must be a
 555   *   pointer to memory cells already allocated.
 556   * @len: number of bytes of *value: value[0]..value[len-1]. Initialy
 557   *   holds the sizeof value.
 558   *
 559   * Returns the value of one element inside a structure.
 560   *
 561   * If an element is OPTIONAL and the function "read_value" returns
 562   * %ASN1_ELEMENT_NOT_FOUND, it means that this element wasn't present
 563   * in the der encoding that created the structure.  The first element
 564   * of a SEQUENCE_OF or SET_OF is named "?1". The second one "?2" and
 565   * so on.
 566   *
 567   * INTEGER: VALUE will contain a two's complement form integer.
 568   *
 569   *            integer=-1  -> value[0]=0xFF , len=1.
 570   *            integer=1   -> value[0]=0x01 , len=1.
 571   *
 572   * ENUMERATED: As INTEGER (but only with not negative numbers).
 573   *
 574   * BOOLEAN: VALUE will be the null terminated string "TRUE" or
 575   *   "FALSE" and LEN=5 or LEN=6.
 576   *
 577   * OBJECT IDENTIFIER: VALUE will be a null terminated string with
 578   *   each number separated by a dot (i.e. "1.2.3.543.1").
 579   *
 580   *                      LEN = strlen(VALUE)+1
 581   *
 582   * UTCTime: VALUE will be a null terminated string in one of these
 583   *   formats: "YYMMDDhhmmss+hh'mm'" or "YYMMDDhhmmss-hh'mm'".
 584   *   LEN=strlen(VALUE)+1.
 585   *
 586   * GeneralizedTime: VALUE will be a null terminated string in the
 587   *   same format used to set the value.
 588   *
 589   * OCTET STRING: VALUE will contain the octet string and LEN will be
 590   *   the number of octets.
 591   *
 592   * GeneralString: VALUE will contain the generalstring and LEN will
 593   *   be the number of octets.
 594   *
 595   * BIT STRING: VALUE will contain the bit string organized by bytes
 596   *   and LEN will be the number of bits.
 597   *
 598   * CHOICE: If NAME indicates a choice type, VALUE will specify the
 599   *   alternative selected.
 600   *
 601   * ANY: If NAME indicates an any type, VALUE will indicate the DER
 602   *   encoding of the structure actually used.
 603   *
 604   * Returns:
 605   *
 606   *   ASN1_SUCCESS: Set value OK.
 607   *
 608   *   ASN1_ELEMENT_NOT_FOUND: NAME is not a valid element.
 609   *
 610   *   ASN1_VALUE_NOT_FOUND: There isn't any value for the element selected.
 611   *
 612   *   ASN1_MEM_ERROR: The value vector isn't big enough to store the result.
 613   *   In this case LEN will contain the number of bytes needed.
 614   *
 615   **/
 616 asn1_retCode
 617 asn1_read_value(ASN1_TYPE root,const char *name,void* ivalue, int *len)
 618 {
 619   node_asn *node,*p,*p2;
 620   int len2,len3;
 621   int value_size = *len;
 622   unsigned char* value = ivalue;
 623
 624   node=asn1_find_node(root,name);
 625   if(node==NULL) return  ASN1_ELEMENT_NOT_FOUND;
 626
 627   if((type_field(node->type)!=TYPE_NULL) &&
 628      (type_field(node->type)!=TYPE_CHOICE) &&
 629      !(node->type&CONST_DEFAULT) && !(node->type&CONST_ASSIGN) &&
 630      (node->value==NULL))
 631     return ASN1_VALUE_NOT_FOUND;
 632
 633   switch(type_field(node->type)){
 634   case TYPE_NULL:
 635     PUT_STR_VALUE( value, value_size, "NULL");
 636     break;
 637   case TYPE_BOOLEAN:
 638     if((node->type&CONST_DEFAULT) && (node->value==NULL)){
 639       p=node->down;
 640       while(type_field(p->type)!=TYPE_DEFAULT) p=p->right;
 641       if(p->type&CONST_TRUE) {
 642         PUT_STR_VALUE( value, value_size, "TRUE");
 643       } else {
 644         PUT_STR_VALUE(value, value_size, "FALSE");
 645       }
 646     }
 647     else if(node->value[0]=='T') {
 648         PUT_STR_VALUE(value, value_size, "TRUE");
 649     }
 650     else {
 651         PUT_STR_VALUE(value, value_size, "FALSE");
 652     }
 653     break;
 654   case TYPE_INTEGER: case TYPE_ENUMERATED:
 655     if((node->type&CONST_DEFAULT) && (node->value==NULL)){
 656       p=node->down;
 657       while(type_field(p->type)!=TYPE_DEFAULT) p=p->right;
 658       if((isdigit(p->value[0])) || (p->value[0]=='-') || (p->value[0]=='+')){
 659         if (_asn1_convert_integer(p->value,value,value_size, len) !=
 660             ASN1_SUCCESS)
 661           return ASN1_MEM_ERROR;
 662       }
 663       else{ /* is an identifier like v1 */
 664         p2=node->down;
 665         while(p2){
 666           if(type_field(p2->type)==TYPE_CONSTANT){
 667             if((p2->name) && (!strcmp(p2->name,p->value))){
 668               if (_asn1_convert_integer(p2->value,value,value_size, len) !=
 669                   ASN1_SUCCESS)
 670                 return ASN1_MEM_ERROR;
 671               break;
 672             }
 673           }
 674           p2=p2->right;
 675         }
 676       }
 677     }
 678     else{
 679       len2=-1;
 680       if (asn1_get_octet_der(node->value,node->value_len,&len2,value, value_size, len)!=ASN1_SUCCESS) return ASN1_MEM_ERROR;
 681     }
 682     break;
 683   case TYPE_OBJECT_ID:
 684     if(node->type&CONST_ASSIGN){
 685       value[0]=0;
 686       p=node->down;
 687       while(p){
 688         if(type_field(p->type)==TYPE_CONSTANT){
 689           ADD_STR_VALUE(value,value_size,p->value);
 690           if(p->right) {
 691           ADD_STR_VALUE(value,value_size,".");
 692           }
 693         }
 694         p=p->right;
 695       }
 696       *len = strlen(value) + 1;
 697     }
 698     else if((node->type&CONST_DEFAULT) && (node->value==NULL)){
 699       p=node->down;
 700       while(type_field(p->type)!=TYPE_DEFAULT) p=p->right;
 701       PUT_STR_VALUE(value, value_size, p->value);
 702       }
 703     else {
 704       PUT_STR_VALUE(value, value_size, node->value);
 705     }
 706     break;
 707   case TYPE_TIME:
 708     PUT_STR_VALUE( value, value_size, node->value);
 709     break;
 710   case TYPE_OCTET_STRING:
 711     len2=-1;
 712     if (asn1_get_octet_der(node->value,node->value_len,&len2,value, value_size, len)!=ASN1_SUCCESS) return ASN1_MEM_ERROR;
 713     break;
 714   case TYPE_GENERALSTRING:
 715     len2=-1;
 716     if (asn1_get_octet_der(node->value,node->value_len,&len2,value, value_size, len)!=ASN1_SUCCESS) return ASN1_MEM_ERROR;
 717     break;
 718   case TYPE_BIT_STRING:
 719     len2=-1;
 720     if (asn1_get_bit_der(node->value,node->value_len,&len2,value,value_size,len)!=ASN1_SUCCESS) return ASN1_MEM_ERROR;
 721     break;
 722   case TYPE_CHOICE:
 723     PUT_STR_VALUE( value, value_size, node->down->name);
 724     break;
 725   case TYPE_ANY:
 726     len3=-1;
 727     len2=asn1_get_length_der(node->value,node->value_len,&len3);
 728     if (len2 < 0) return ASN1_DER_ERROR;
 729     PUT_VALUE( value, value_size, node->value+len3, len2);
 730     break;
 731   default:
 732     return  ASN1_ELEMENT_NOT_FOUND;
 733     break;
 734   }
 735   return ASN1_SUCCESS;
 736 }
 737
 738
 739 /**
 740   * asn1_read_tag - Returns the TAG of one element inside a structure
 741   * @root: pointer to a structure
 742   * @name: the name of the element inside a structure.
 743   * @tagValue:  variable that will contain the TAG value.
 744   * @classValue: variable that will specify the TAG type.
 745   *
 746   * Returns the TAG and the CLASS of one element inside a structure.
 747   * CLASS can have one of these constants: %ASN1_CLASS_APPLICATION,
 748   * %ASN1_CLASS_UNIVERSAL, %ASN1_CLASS_PRIVATE or
 749   * %ASN1_CLASS_CONTEXT_SPECIFIC.
 750   *
 751   * Returns:
 752   *
 753   *   ASN1_SUCCESS: Set value OK.
 754   *
 755   *   ASN1_ELEMENT_NOT_FOUND: NAME is not a valid element.
 756   *
 757   **/
 758 asn1_retCode
 759 asn1_read_tag(node_asn *root,const char *name,int *tagValue, int *classValue)
 760 {
 761   node_asn *node,*p,*pTag;
 762
 763   node=asn1_find_node(root,name);
 764   if(node==NULL) return  ASN1_ELEMENT_NOT_FOUND;
 765
 766   p=node->down;
 767
 768   /* pTag will points to the IMPLICIT TAG */
 769   pTag=NULL;
 770   if(node->type&CONST_TAG){
 771     while(p){
 772       if(type_field(p->type)==TYPE_TAG){
 773         if((p->type&CONST_IMPLICIT) && (pTag==NULL))
 774           pTag=p;
 775         else if(p->type&CONST_EXPLICIT)
 776           pTag=NULL;
 777       }
 778       p=p->right;
 779     }
 780   }
 781
 782   if(pTag){
 783     *tagValue=strtoul(pTag->value,NULL,10);
 784
 785     if(pTag->type&CONST_APPLICATION) *classValue=ASN1_CLASS_APPLICATION;
 786     else if(pTag->type&CONST_UNIVERSAL) *classValue=ASN1_CLASS_UNIVERSAL;
 787     else if(pTag->type&CONST_PRIVATE) *classValue=ASN1_CLASS_PRIVATE;
 788     else *classValue=ASN1_CLASS_CONTEXT_SPECIFIC;
 789   }
 790   else{
 791     *classValue=ASN1_CLASS_UNIVERSAL;
 792
 793     switch(type_field(node->type)){
 794     case TYPE_NULL:
 795       *tagValue=ASN1_TAG_NULL;break;
 796     case TYPE_BOOLEAN:
 797       *tagValue=ASN1_TAG_BOOLEAN;break;
 798     case TYPE_INTEGER:
 799       *tagValue=ASN1_TAG_INTEGER;break;
 800     case TYPE_ENUMERATED:
 801       *tagValue=ASN1_TAG_ENUMERATED;break;
 802     case TYPE_OBJECT_ID:
 803       *tagValue=ASN1_TAG_OBJECT_ID;break;
 804     case TYPE_TIME:
 805       if(node->type&CONST_UTC){
 806         *tagValue=ASN1_TAG_UTCTime;
 807       }
 808       else *tagValue=ASN1_TAG_GENERALIZEDTime;
 809       break;
 810     case TYPE_OCTET_STRING:
 811       *tagValue=ASN1_TAG_OCTET_STRING;break;
 812     case TYPE_GENERALSTRING:
 813       *tagValue=ASN1_TAG_GENERALSTRING;break;
 814     case TYPE_BIT_STRING:
 815       *tagValue=ASN1_TAG_BIT_STRING;break;
 816     case TYPE_SEQUENCE: case TYPE_SEQUENCE_OF:
 817       *tagValue=ASN1_TAG_SEQUENCE;break;
 818     case TYPE_SET: case TYPE_SET_OF:
 819       *tagValue=ASN1_TAG_SET;break;
 820     case TYPE_TAG:
 821     case TYPE_CHOICE:
 822     case TYPE_ANY:
 823       break;
 824     default:
 825       break;
 826     }
 827   }
 828
 829
 830   return ASN1_SUCCESS;
 831
 832 }