lib/minitasn1/coding.c

   1 /*
   2  * Copyright (C) 2002-2012 Free Software Foundation, Inc.
   3  *
   4  * This file is part of LIBTASN1.
   5  *
   6  * The LIBTASN1 library is free software; you can redistribute it
   7  * and/or modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19  * 02110-1301, USA
  20  */
  21
  22
  23 /*****************************************************/
  24 /* File: coding.c                                    */
  25 /* Description: Functions to create a DER coding of  */
  26 /*   an ASN1 type.                                   */
  27 /*****************************************************/
  28
  29 #include <int.h>
  30 #include "parser_aux.h"
  31 #include <gstr.h>
  32 #include "element.h"
  33 #include <structure.h>
  34
  35 #define MAX_TAG_LEN 16
  36
  37 /******************************************************/
  38 /* Function : _asn1_error_description_value_not_found */
  39 /* Description: creates the ErrorDescription string   */
  40 /* for the ASN1_VALUE_NOT_FOUND error.                */
  41 /* Parameters:                                        */
  42 /*   node: node of the tree where the value is NULL.  */
  43 /*   ErrorDescription: string returned.               */
  44 /* Return:                                            */
  45 /******************************************************/
  46 static void
  47 _asn1_error_description_value_not_found (ASN1_TYPE node,
  48                                          char *ErrorDescription)
  49 {
  50
  51   if (ErrorDescription == NULL)
  52     return;
  53
  54   Estrcpy (ErrorDescription, ":: value of element '");
  55   _asn1_hierarchical_name (node, ErrorDescription + strlen (ErrorDescription),
  56                            ASN1_MAX_ERROR_DESCRIPTION_SIZE - 40);
  57   Estrcat (ErrorDescription, "' not found");
  58
  59 }
  60
  61 /**
  62  * asn1_length_der:
  63  * @len: value to convert.
  64  * @ans: string returned.
  65  * @ans_len: number of meaningful bytes of ANS (ans[0]..ans[ans_len-1]).
  66  *
  67  * Creates the DER coding for the LEN parameter (only the length).
  68  * The @ans buffer is pre-allocated and must have room for the output.
  69  **/
  70 void
  71 asn1_length_der (unsigned long int len, unsigned char *ans, int *ans_len)
  72 {
  73   int k;
  74   unsigned char temp[SIZEOF_UNSIGNED_LONG_INT];
  75
  76   if (len < 128)
  77     {
  78       /* short form */
  79       if (ans != NULL)
  80         ans[0] = (unsigned char) len;
  81       *ans_len = 1;
  82     }
  83   else
  84     {
  85       /* Long form */
  86       k = 0;
  87       while (len)
  88         {
  89           temp[k++] = len & 0xFF;
  90           len = len >> 8;
  91         }
  92       *ans_len = k + 1;
  93       if (ans != NULL)
  94         {
  95           ans[0] = ((unsigned char) k & 0x7F) + 128;
  96           while (k--)
  97             ans[*ans_len - 1 - k] = temp[k];
  98         }
  99     }
 100 }
 101
 102 /******************************************************/
 103 /* Function : _asn1_tag_der                           */
 104 /* Description: creates the DER coding for the CLASS  */
 105 /* and TAG parameters.                                */
 106 /* Parameters:                                        */
 107 /*   class: value to convert.                         */
 108 /*   tag_value: value to convert.                     */
 109 /*   ans: string returned.                            */
 110 /*   ans_len: number of meaningful bytes of ANS       */
 111 /*            (ans[0]..ans[ans_len-1]).               */
 112 /* Return:                                            */
 113 /******************************************************/
 114 static void
 115 _asn1_tag_der (unsigned char class, unsigned int tag_value,
 116                unsigned char *ans, int *ans_len)
 117 {
 118   int k;
 119   unsigned char temp[SIZEOF_UNSIGNED_INT];
 120
 121   if (tag_value < 31)
 122     {
 123       /* short form */
 124       ans[0] = (class & 0xE0) + ((unsigned char) (tag_value & 0x1F));
 125       *ans_len = 1;
 126     }
 127   else
 128     {
 129       /* Long form */
 130       ans[0] = (class & 0xE0) + 31;
 131       k = 0;
 132       while (tag_value)
 133         {
 134           temp[k++] = tag_value & 0x7F;
 135           tag_value = tag_value >> 7;
 136         }
 137       *ans_len = k + 1;
 138       while (k--)
 139         ans[*ans_len - 1 - k] = temp[k] + 128;
 140       ans[*ans_len - 1] -= 128;
 141     }
 142 }
 143
 144 /**
 145  * asn1_octet_der:
 146  * @str: OCTET string.
 147  * @str_len: STR length (str[0]..str[str_len-1]).
 148  * @der: string returned.
 149  * @der_len: number of meaningful bytes of DER (der[0]..der[ans_len-1]).
 150  *
 151  * Creates the DER coding for an OCTET type (length included).
 152  **/
 153 void
 154 asn1_octet_der (const unsigned char *str, int str_len,
 155                 unsigned char *der, int *der_len)
 156 {
 157   int len_len;
 158
 159   if (der == NULL || str_len < 0)
 160     return;
 161   asn1_length_der (str_len, der, &len_len);
 162   memcpy (der + len_len, str, str_len);
 163   *der_len = str_len + len_len;
 164 }
 165
 166 /******************************************************/
 167 /* Function : _asn1_time_der                          */
 168 /* Description: creates the DER coding for a TIME     */
 169 /* type (length included).                            */
 170 /* Parameters:                                        */
 171 /*   str: TIME null-terminated string.                */
 172 /*   der: string returned.                            */
 173 /*   der_len: number of meaningful bytes of DER       */
 174 /*            (der[0]..der[ans_len-1]). Initially it  */
 175 /*            if must store the lenght of DER.        */
 176 /* Return:                                            */
 177 /*   ASN1_MEM_ERROR when DER isn't big enough         */
 178 /*   ASN1_SUCCESS otherwise                           */
 179 /******************************************************/
 180 static asn1_retCode
 181 _asn1_time_der (unsigned char *str, unsigned char *der, int *der_len)
 182 {
 183   int len_len;
 184   int max_len;
 185   int str_len = _asn1_strlen (str);
 186
 187   max_len = *der_len;
 188
 189   asn1_length_der (str_len, (max_len > 0) ? der : NULL, &len_len);
 190
 191   if ((len_len + str_len) <= max_len)
 192     memcpy (der + len_len, str, str_len);
 193   *der_len = len_len + str_len;
 194
 195   if ((*der_len) > max_len)
 196     return ASN1_MEM_ERROR;
 197
 198   return ASN1_SUCCESS;
 199 }
 200
 201
 202 /*
 203 void
 204 _asn1_get_utctime_der(unsigned char *der,int *der_len,unsigned char *str)
 205 {
 206   int len_len,str_len;
 207   char temp[20];
 208
 209   if(str==NULL) return;
 210   str_len=asn1_get_length_der(der,*der_len,&len_len);
 211   if (str_len<0) return;
 212   memcpy(temp,der+len_len,str_len);
 213   *der_len=str_len+len_len;
 214   switch(str_len){
 215   case 11:
 216     temp[10]=0;
 217     strcat(temp,"00+0000");
 218     break;
 219   case 13:
 220     temp[12]=0;
 221     strcat(temp,"+0000");
 222     break;
 223   case 15:
 224     temp[15]=0;
 225     memmove(temp+12,temp+10,6);
 226     temp[10]=temp[11]='0';
 227     break;
 228   case 17:
 229     temp[17]=0;
 230     break;
 231   default:
 232     return;
 233   }
 234   strcpy(str,temp);
 235 }
 236 */
 237
 238 /******************************************************/
 239 /* Function : _asn1_objectid_der                      */
 240 /* Description: creates the DER coding for an         */
 241 /* OBJECT IDENTIFIER  type (length included).         */
 242 /* Parameters:                                        */
 243 /*   str: OBJECT IDENTIFIER null-terminated string.   */
 244 /*   der: string returned.                            */
 245 /*   der_len: number of meaningful bytes of DER       */
 246 /*            (der[0]..der[ans_len-1]). Initially it  */
 247 /*            must store the length of DER.           */
 248 /* Return:                                            */
 249 /*   ASN1_MEM_ERROR when DER isn't big enough         */
 250 /*   ASN1_SUCCESS otherwise                           */
 251 /******************************************************/
 252 static asn1_retCode
 253 _asn1_objectid_der (unsigned char *str, unsigned char *der, int *der_len)
 254 {
 255   int len_len, counter, k, first, max_len;
 256   char *temp, *n_end, *n_start;
 257   unsigned char bit7;
 258   unsigned long val, val1 = 0;
 259   int str_len = _asn1_strlen (str);
 260
 261   max_len = *der_len;
 262
 263   temp = _asn1_malloc (str_len + 2);
 264   if (temp == NULL)
 265     return ASN1_MEM_ALLOC_ERROR;
 266
 267   memcpy (temp, str, str_len);
 268   temp[str_len] = '.';
 269   temp[str_len + 1] = 0;
 270
 271   counter = 0;
 272   n_start = temp;
 273   while ((n_end = strchr (n_start, '.')))
 274     {
 275       *n_end = 0;
 276       val = strtoul (n_start, NULL, 10);
 277       counter++;
 278
 279       if (counter == 1)
 280         val1 = val;
 281       else if (counter == 2)
 282         {
 283           if (max_len > 0)
 284             der[0] = 40 * val1 + val;
 285           *der_len = 1;
 286         }
 287       else
 288         {
 289           first = 0;
 290           for (k = 4; k >= 0; k--)
 291             {
 292               bit7 = (val >> (k * 7)) & 0x7F;
 293               if (bit7 || first || !k)
 294                 {
 295                   if (k)
 296                     bit7 |= 0x80;
 297                   if (max_len > (*der_len))
 298                     der[*der_len] = bit7;
 299                   (*der_len)++;
 300                   first = 1;
 301                 }
 302             }
 303
 304         }
 305       n_start = n_end + 1;
 306     }
 307
 308   asn1_length_der (*der_len, NULL, &len_len);
 309   if (max_len >= (*der_len + len_len))
 310     {
 311       memmove (der + len_len, der, *der_len);
 312       asn1_length_der (*der_len, der, &len_len);
 313     }
 314   *der_len += len_len;
 315
 316   _asn1_free (temp);
 317
 318   if (max_len < (*der_len))
 319     return ASN1_MEM_ERROR;
 320
 321   return ASN1_SUCCESS;
 322 }
 323
 324
 325 static const unsigned char bit_mask[] =
 326   { 0xFF, 0xFE, 0xFC, 0xF8, 0xF0, 0xE0, 0xC0, 0x80 };
 327
 328 /**
 329  * asn1_bit_der:
 330  * @str: BIT string.
 331  * @bit_len: number of meaningful bits in STR.
 332  * @der: string returned.
 333  * @der_len: number of meaningful bytes of DER
 334  *   (der[0]..der[ans_len-1]).
 335  *
 336  * Creates the DER coding for a BIT STRING type (length and pad
 337  * included).
 338  **/
 339 void
 340 asn1_bit_der (const unsigned char *str, int bit_len,
 341               unsigned char *der, int *der_len)
 342 {
 343   int len_len, len_byte, len_pad;
 344
 345   if (der == NULL)
 346     return;
 347   len_byte = bit_len >> 3;
 348   len_pad = 8 - (bit_len & 7);
 349   if (len_pad == 8)
 350     len_pad = 0;
 351   else
 352     len_byte++;
 353   asn1_length_der (len_byte + 1, der, &len_len);
 354   der[len_len] = len_pad;
 355   memcpy (der + len_len + 1, str, len_byte);
 356   der[len_len + len_byte] &= bit_mask[len_pad];
 357   *der_len = len_byte + len_len + 1;
 358 }
 359
 360
 361 /******************************************************/
 362 /* Function : _asn1_complete_explicit_tag             */
 363 /* Description: add the length coding to the EXPLICIT */
 364 /* tags.                                              */
 365 /* Parameters:                                        */
 366 /*   node: pointer to the tree element.               */
 367 /*   der: string with the DER coding of the whole tree*/
 368 /*   counter: number of meaningful bytes of DER       */
 369 /*            (der[0]..der[*counter-1]).              */
 370 /*   max_len: size of der vector                      */
 371 /* Return:                                            */
 372 /*   ASN1_MEM_ERROR if der vector isn't big enough,   */
 373 /*   otherwise ASN1_SUCCESS.                          */
 374 /******************************************************/
 375 static asn1_retCode
 376 _asn1_complete_explicit_tag (ASN1_TYPE node, unsigned char *der,
 377                              int *counter, int *max_len)
 378 {
 379   ASN1_TYPE p;
 380   int is_tag_implicit, len2, len3;
 381   unsigned char temp[SIZEOF_UNSIGNED_INT];
 382
 383   is_tag_implicit = 0;
 384
 385   if (node->type & CONST_TAG)
 386     {
 387       p = node->down;
 388       /* When there are nested tags we must complete them reverse to
 389          the order they were created. This is because completing a tag
 390          modifies all data within it, including the incomplete tags
 391          which store buffer positions -- simon@josefsson.org 2002-09-06
 392        */
 393       while (p->right)
 394         p = p->right;
 395       while (p && p != node->down->left)
 396         {
 397           if (type_field (p->type) == TYPE_TAG)
 398             {
 399               if (p->type & CONST_EXPLICIT)
 400                 {
 401                   len2 = strtol (p->name, NULL, 10);
 402                   _asn1_set_name (p, NULL);
 403                   asn1_length_der (*counter - len2, temp, &len3);
 404                   if (len3 <= (*max_len))
 405                     {
 406                       memmove (der + len2 + len3, der + len2,
 407                                *counter - len2);
 408                       memcpy (der + len2, temp, len3);
 409                     }
 410                   *max_len -= len3;
 411                   *counter += len3;
 412                   is_tag_implicit = 0;
 413                 }
 414               else
 415                 {               /* CONST_IMPLICIT */
 416                   if (!is_tag_implicit)
 417                     {
 418                       is_tag_implicit = 1;
 419                     }
 420                 }
 421             }
 422           p = p->left;
 423         }
 424     }
 425
 426   if (*max_len < 0)
 427     return ASN1_MEM_ERROR;
 428
 429   return ASN1_SUCCESS;
 430 }
 431
 432
 433 /******************************************************/
 434 /* Function : _asn1_insert_tag_der                    */
 435 /* Description: creates the DER coding of tags of one */
 436 /* NODE.                                              */
 437 /* Parameters:                                        */
 438 /*   node: pointer to the tree element.               */
 439 /*   der: string returned                             */
 440 /*   counter: number of meaningful bytes of DER       */
 441 /*            (counter[0]..der[*counter-1]).          */
 442 /*   max_len: size of der vector                      */
 443 /* Return:                                            */
 444 /*   ASN1_GENERIC_ERROR if the type is unknown,       */
 445 /*   ASN1_MEM_ERROR if der vector isn't big enough,   */
 446 /*   otherwise ASN1_SUCCESS.                          */
 447 /******************************************************/
 448 static asn1_retCode
 449 _asn1_insert_tag_der (ASN1_TYPE node, unsigned char *der, int *counter,
 450                       int *max_len)
 451 {
 452   ASN1_TYPE p;
 453   int tag_len, is_tag_implicit;
 454   unsigned char class, class_implicit = 0, temp[SIZEOF_UNSIGNED_INT * 3 + 1];
 455   unsigned long tag_implicit = 0;
 456   unsigned char tag_der[MAX_TAG_LEN];
 457
 458   is_tag_implicit = 0;
 459
 460   if (node->type & CONST_TAG)
 461     {
 462       p = node->down;
 463       while (p)
 464         {
 465           if (type_field (p->type) == TYPE_TAG)
 466             {
 467               if (p->type & CONST_APPLICATION)
 468                 class = ASN1_CLASS_APPLICATION;
 469               else if (p->type & CONST_UNIVERSAL)
 470                 class = ASN1_CLASS_UNIVERSAL;
 471               else if (p->type & CONST_PRIVATE)
 472                 class = ASN1_CLASS_PRIVATE;
 473               else
 474                 class = ASN1_CLASS_CONTEXT_SPECIFIC;
 475
 476               if (p->type & CONST_EXPLICIT)
 477                 {
 478                   if (is_tag_implicit)
 479                     _asn1_tag_der (class_implicit, tag_implicit, tag_der,
 480                                    &tag_len);
 481                   else
 482                     _asn1_tag_der (class | ASN1_CLASS_STRUCTURED,
 483                                    _asn1_strtoul (p->value, NULL, 10),
 484                                    tag_der, &tag_len);
 485
 486                   *max_len -= tag_len;
 487                   if (*max_len >= 0)
 488                     memcpy (der + *counter, tag_der, tag_len);
 489                   *counter += tag_len;
 490
 491                   _asn1_ltostr (*counter, (char *) temp);
 492                   _asn1_set_name (p, (const char *) temp);
 493
 494                   is_tag_implicit = 0;
 495                 }
 496               else
 497                 {               /* CONST_IMPLICIT */
 498                   if (!is_tag_implicit)
 499                     {
 500                       if ((type_field (node->type) == TYPE_SEQUENCE) ||
 501                           (type_field (node->type) == TYPE_SEQUENCE_OF) ||
 502                           (type_field (node->type) == TYPE_SET) ||
 503                           (type_field (node->type) == TYPE_SET_OF))
 504                         class |= ASN1_CLASS_STRUCTURED;
 505                       class_implicit = class;
 506                       tag_implicit = _asn1_strtoul (p->value, NULL, 10);
 507                       is_tag_implicit = 1;
 508                     }
 509                 }
 510             }
 511           p = p->right;
 512         }
 513     }
 514
 515   if (is_tag_implicit)
 516     {
 517       _asn1_tag_der (class_implicit, tag_implicit, tag_der, &tag_len);
 518     }
 519   else
 520     {
 521       switch (type_field (node->type))
 522         {
 523         case TYPE_NULL:
 524           _asn1_tag_der (ASN1_CLASS_UNIVERSAL, ASN1_TAG_NULL, tag_der,
 525                          &tag_len);
 526           break;
 527         case TYPE_BOOLEAN:
 528           _asn1_tag_der (ASN1_CLASS_UNIVERSAL, ASN1_TAG_BOOLEAN, tag_der,
 529                          &tag_len);
 530           break;
 531         case TYPE_INTEGER:
 532           _asn1_tag_der (ASN1_CLASS_UNIVERSAL, ASN1_TAG_INTEGER, tag_der,
 533                          &tag_len);
 534           break;
 535         case TYPE_ENUMERATED:
 536           _asn1_tag_der (ASN1_CLASS_UNIVERSAL, ASN1_TAG_ENUMERATED, tag_der,
 537                          &tag_len);
 538           break;
 539         case TYPE_OBJECT_ID:
 540           _asn1_tag_der (ASN1_CLASS_UNIVERSAL, ASN1_TAG_OBJECT_ID, tag_der,
 541                          &tag_len);
 542           break;
 543         case TYPE_TIME:
 544           if (node->type & CONST_UTC)
 545             {
 546               _asn1_tag_der (ASN1_CLASS_UNIVERSAL, ASN1_TAG_UTCTime, tag_der,
 547                              &tag_len);
 548             }
 549           else
 550             _asn1_tag_der (ASN1_CLASS_UNIVERSAL, ASN1_TAG_GENERALIZEDTime,
 551                            tag_der, &tag_len);
 552           break;
 553         case TYPE_OCTET_STRING:
 554           _asn1_tag_der (ASN1_CLASS_UNIVERSAL, ASN1_TAG_OCTET_STRING, tag_der,
 555                          &tag_len);
 556           break;
 557         case TYPE_GENERALSTRING:
 558           _asn1_tag_der (ASN1_CLASS_UNIVERSAL, ASN1_TAG_GENERALSTRING,
 559                          tag_der, &tag_len);
 560           break;
 561         case TYPE_BIT_STRING:
 562           _asn1_tag_der (ASN1_CLASS_UNIVERSAL, ASN1_TAG_BIT_STRING, tag_der,
 563                          &tag_len);
 564           break;
 565         case TYPE_SEQUENCE:
 566         case TYPE_SEQUENCE_OF:
 567           _asn1_tag_der (ASN1_CLASS_UNIVERSAL | ASN1_CLASS_STRUCTURED,
 568                          ASN1_TAG_SEQUENCE, tag_der, &tag_len);
 569           break;
 570         case TYPE_SET:
 571         case TYPE_SET_OF:
 572           _asn1_tag_der (ASN1_CLASS_UNIVERSAL | ASN1_CLASS_STRUCTURED,
 573                          ASN1_TAG_SET, tag_der, &tag_len);
 574           break;
 575         case TYPE_TAG:
 576           tag_len = 0;
 577           break;
 578         case TYPE_CHOICE:
 579           tag_len = 0;
 580           break;
 581         case TYPE_ANY:
 582           tag_len = 0;
 583           break;
 584         default:
 585           return ASN1_GENERIC_ERROR;
 586         }
 587     }
 588
 589   *max_len -= tag_len;
 590   if (*max_len >= 0)
 591     memcpy (der + *counter, tag_der, tag_len);
 592   *counter += tag_len;
 593
 594   if (*max_len < 0)
 595     return ASN1_MEM_ERROR;
 596
 597   return ASN1_SUCCESS;
 598 }
 599
 600 /******************************************************/
 601 /* Function : _asn1_ordering_set                      */
 602 /* Description: puts the elements of a SET type in    */
 603 /* the correct order according to DER rules.          */
 604 /* Parameters:                                        */
 605 /*   der: string with the DER coding.                 */
 606 /*   node: pointer to the SET element.                */
 607 /* Return:                                            */
 608 /******************************************************/
 609 static void
 610 _asn1_ordering_set (unsigned char *der, int der_len, ASN1_TYPE node)
 611 {
 612   struct vet
 613   {
 614     int end;
 615     unsigned long value;
 616     struct vet *next, *prev;
 617   };
 618
 619   int counter, len, len2;
 620   struct vet *first, *last, *p_vet, *p2_vet;
 621   ASN1_TYPE p;
 622   unsigned char class, *temp;
 623   unsigned long tag;
 624
 625   counter = 0;
 626
 627   if (type_field (node->type) != TYPE_SET)
 628     return;
 629
 630   p = node->down;
 631   while ((type_field (p->type) == TYPE_TAG)
 632          || (type_field (p->type) == TYPE_SIZE))
 633     p = p->right;
 634
 635   if ((p == NULL) || (p->right == NULL))
 636     return;
 637
 638   first = last = NULL;
 639   while (p)
 640     {
 641       p_vet = (struct vet *) _asn1_malloc (sizeof (struct vet));
 642       if (p_vet == NULL)
 643         return;
 644
 645       p_vet->next = NULL;
 646       p_vet->prev = last;
 647       if (first == NULL)
 648         first = p_vet;
 649       else
 650         last->next = p_vet;
 651       last = p_vet;
 652
 653       /* tag value calculation */
 654       if (asn1_get_tag_der
 655           (der + counter, der_len - counter, &class, &len2,
 656            &tag) != ASN1_SUCCESS)
 657         return;
 658       p_vet->value = (class << 24) | tag;
 659       counter += len2;
 660
 661       /* extraction and length */
 662       len2 = asn1_get_length_der (der + counter, der_len - counter, &len);
 663       if (len2 < 0)
 664         return;
 665       counter += len + len2;
 666
 667       p_vet->end = counter;
 668       p = p->right;
 669     }
 670
 671   p_vet = first;
 672
 673   while (p_vet)
 674     {
 675       p2_vet = p_vet->next;
 676       counter = 0;
 677       while (p2_vet)
 678         {
 679           if (p_vet->value > p2_vet->value)
 680             {
 681               /* change position */
 682               temp = (unsigned char *) _asn1_malloc (p_vet->end - counter);
 683               if (temp == NULL)
 684                 return;
 685
 686               memcpy (temp, der + counter, p_vet->end - counter);
 687               memcpy (der + counter, der + p_vet->end,
 688                       p2_vet->end - p_vet->end);
 689               memcpy (der + counter + p2_vet->end - p_vet->end, temp,
 690                       p_vet->end - counter);
 691               _asn1_free (temp);
 692
 693               tag = p_vet->value;
 694               p_vet->value = p2_vet->value;
 695               p2_vet->value = tag;
 696
 697               p_vet->end = counter + (p2_vet->end - p_vet->end);
 698             }
 699           counter = p_vet->end;
 700
 701           p2_vet = p2_vet->next;
 702           p_vet = p_vet->next;
 703         }
 704
 705       if (p_vet != first)
 706         p_vet->prev->next = NULL;
 707       else
 708         first = NULL;
 709       _asn1_free (p_vet);
 710       p_vet = first;
 711     }
 712 }
 713
 714 /******************************************************/
 715 /* Function : _asn1_ordering_set_of                   */
 716 /* Description: puts the elements of a SET OF type in */
 717 /* the correct order according to DER rules.          */
 718 /* Parameters:                                        */
 719 /*   der: string with the DER coding.                 */
 720 /*   node: pointer to the SET OF element.             */
 721 /* Return:                                            */
 722 /******************************************************/
 723 static void
 724 _asn1_ordering_set_of (unsigned char *der, int der_len, ASN1_TYPE node)
 725 {
 726   struct vet
 727   {
 728     int end;
 729     struct vet *next, *prev;
 730   };
 731
 732   int counter, len, len2, change;
 733   struct vet *first, *last, *p_vet, *p2_vet;
 734   ASN1_TYPE p;
 735   unsigned char *temp, class;
 736   unsigned long k, max;
 737
 738   counter = 0;
 739
 740   if (type_field (node->type) != TYPE_SET_OF)
 741     return;
 742
 743   p = node->down;
 744   while ((type_field (p->type) == TYPE_TAG)
 745          || (type_field (p->type) == TYPE_SIZE))
 746     p = p->right;
 747   p = p->right;
 748
 749   if ((p == NULL) || (p->right == NULL))
 750     return;
 751
 752   first = last = NULL;
 753   while (p)
 754     {
 755       p_vet = (struct vet *) _asn1_malloc (sizeof (struct vet));
 756       if (p_vet == NULL)
 757         return;
 758
 759       p_vet->next = NULL;
 760       p_vet->prev = last;
 761       if (first == NULL)
 762         first = p_vet;
 763       else
 764         last->next = p_vet;
 765       last = p_vet;
 766
 767       /* extraction of tag and length */
 768       if (der_len - counter > 0)
 769         {
 770
 771           if (asn1_get_tag_der
 772               (der + counter, der_len - counter, &class, &len,
 773                NULL) != ASN1_SUCCESS)
 774             return;
 775           counter += len;
 776
 777           len2 = asn1_get_length_der (der + counter, der_len - counter, &len);
 778           if (len2 < 0)
 779             return;
 780           counter += len + len2;
 781         }
 782
 783       p_vet->end = counter;
 784       p = p->right;
 785     }
 786
 787   p_vet = first;
 788
 789   while (p_vet)
 790     {
 791       p2_vet = p_vet->next;
 792       counter = 0;
 793       while (p2_vet)
 794         {
 795           if ((p_vet->end - counter) > (p2_vet->end - p_vet->end))
 796             max = p_vet->end - counter;
 797           else
 798             max = p2_vet->end - p_vet->end;
 799
 800           change = -1;
 801           for (k = 0; k < max; k++)
 802             if (der[counter + k] > der[p_vet->end + k])
 803               {
 804                 change = 1;
 805                 break;
 806               }
 807             else if (der[counter + k] < der[p_vet->end + k])
 808               {
 809                 change = 0;
 810                 break;
 811               }
 812
 813           if ((change == -1)
 814               && ((p_vet->end - counter) > (p2_vet->end - p_vet->end)))
 815             change = 1;
 816
 817           if (change == 1)
 818             {
 819               /* change position */
 820               temp = (unsigned char *) _asn1_malloc (p_vet->end - counter);
 821               if (temp == NULL)
 822                 return;
 823
 824               memcpy (temp, der + counter, (p_vet->end) - counter);
 825               memcpy (der + counter, der + (p_vet->end),
 826                       (p2_vet->end) - (p_vet->end));
 827               memcpy (der + counter + (p2_vet->end) - (p_vet->end), temp,
 828                       (p_vet->end) - counter);
 829               _asn1_free (temp);
 830
 831               p_vet->end = counter + (p2_vet->end - p_vet->end);
 832             }
 833           counter = p_vet->end;
 834
 835           p2_vet = p2_vet->next;
 836           p_vet = p_vet->next;
 837         }
 838
 839       if (p_vet != first)
 840         p_vet->prev->next = NULL;
 841       else
 842         first = NULL;
 843       _asn1_free (p_vet);
 844       p_vet = first;
 845     }
 846 }
 847
 848 /**
 849  * asn1_der_coding:
 850  * @element: pointer to an ASN1 element
 851  * @name: the name of the structure you want to encode (it must be
 852  *   inside *POINTER).
 853  * @ider: vector that will contain the DER encoding. DER must be a
 854  *   pointer to memory cells already allocated.
 855  * @len: number of bytes of *@ider: @ider[0]..@ider[len-1], Initialy
 856  *   holds the sizeof of der vector.
 857  * @errorDescription : return the error description or an empty
 858  *   string if success.
 859  *
 860  * Creates the DER encoding for the NAME structure (inside *POINTER
 861  * structure).
 862  *
 863  * Returns: %ASN1_SUCCESS if DER encoding OK, %ASN1_ELEMENT_NOT_FOUND
 864  *   if @name is not a valid element, %ASN1_VALUE_NOT_FOUND if there
 865  *   is an element without a value, %ASN1_MEM_ERROR if the @ider
 866  *   vector isn't big enough and in this case @len will contain the
 867  *   length needed.
 868  **/
 869 asn1_retCode
 870 asn1_der_coding (ASN1_TYPE element, const char *name, void *ider, int *len,
 871                  char *ErrorDescription)
 872 {
 873   ASN1_TYPE node, p, p2;
 874   unsigned char temp[SIZEOF_UNSIGNED_LONG_INT * 3 + 1];
 875   int counter, counter_old, len2, len3, tlen, move, max_len, max_len_old;
 876   asn1_retCode err;
 877   unsigned char *der = ider;
 878
 879   node = asn1_find_node (element, name);
 880   if (node == NULL)
 881     return ASN1_ELEMENT_NOT_FOUND;
 882
 883   /* Node is now a locally allocated variable.
 884    * That is because in some point we modify the
 885    * structure, and I don't know why! --nmav
 886    */
 887   node = _asn1_copy_structure3 (node);
 888   if (node == NULL)
 889     return ASN1_ELEMENT_NOT_FOUND;
 890
 891   max_len = *len;
 892
 893   counter = 0;
 894   move = DOWN;
 895   p = node;
 896   while (1)
 897     {
 898
 899       counter_old = counter;
 900       max_len_old = max_len;
 901       if (move != UP)
 902         {
 903           err = _asn1_insert_tag_der (p, der, &counter, &max_len);
 904           if (err != ASN1_SUCCESS && err != ASN1_MEM_ERROR)
 905             goto error;
 906         }
 907       switch (type_field (p->type))
 908         {
 909         case TYPE_NULL:
 910           max_len--;
 911           if (max_len >= 0)
 912             der[counter] = 0;
 913           counter++;
 914           move = RIGHT;
 915           break;
 916         case TYPE_BOOLEAN:
 917           if ((p->type & CONST_DEFAULT) && (p->value == NULL))
 918             {
 919               counter = counter_old;
 920               max_len = max_len_old;
 921             }
 922           else
 923             {
 924               if (p->value == NULL)
 925                 {
 926                   _asn1_error_description_value_not_found (p,
 927                                                            ErrorDescription);
 928                   err = ASN1_VALUE_NOT_FOUND;
 929                   goto error;
 930                 }
 931               max_len -= 2;
 932               if (max_len >= 0)
 933                 {
 934                   der[counter++] = 1;
 935                   if (p->value[0] == 'F')
 936                     der[counter++] = 0;
 937                   else
 938                     der[counter++] = 0xFF;
 939                 }
 940               else
 941                 counter += 2;
 942             }
 943           move = RIGHT;
 944           break;
 945         case TYPE_INTEGER:
 946         case TYPE_ENUMERATED:
 947           if ((p->type & CONST_DEFAULT) && (p->value == NULL))
 948             {
 949               counter = counter_old;
 950               max_len = max_len_old;
 951             }
 952           else
 953             {
 954               if (p->value == NULL)
 955                 {
 956                   _asn1_error_description_value_not_found (p,
 957                                                            ErrorDescription);
 958                   err = ASN1_VALUE_NOT_FOUND;
 959                   goto error;
 960                 }
 961               len2 = asn1_get_length_der (p->value, p->value_len, &len3);
 962               if (len2 < 0)
 963                 {
 964                   err = ASN1_DER_ERROR;
 965                   goto error;
 966                 }
 967               max_len -= len2 + len3;
 968               if (max_len >= 0)
 969                 memcpy (der + counter, p->value, len3 + len2);
 970               counter += len3 + len2;
 971             }
 972           move = RIGHT;
 973           break;
 974         case TYPE_OBJECT_ID:
 975           if ((p->type & CONST_DEFAULT) && (p->value == NULL))
 976             {
 977               counter = counter_old;
 978               max_len = max_len_old;
 979             }
 980           else
 981             {
 982               if (p->value == NULL)
 983                 {
 984                   _asn1_error_description_value_not_found (p,
 985                                                            ErrorDescription);
 986                   err = ASN1_VALUE_NOT_FOUND;
 987                   goto error;
 988                 }
 989               len2 = max_len;
 990               err = _asn1_objectid_der (p->value, der + counter, &len2);
 991               if (err != ASN1_SUCCESS && err != ASN1_MEM_ERROR)
 992                 goto error;
 993
 994               max_len -= len2;
 995               counter += len2;
 996             }
 997           move = RIGHT;
 998           break;
 999         case TYPE_TIME:
1000           if (p->value == NULL)
1001             {
1002               _asn1_error_description_value_not_found (p, ErrorDescription);
1003               err = ASN1_VALUE_NOT_FOUND;
1004               goto error;
1005             }
1006           len2 = max_len;
1007           err = _asn1_time_der (p->value, der + counter, &len2);
1008           if (err != ASN1_SUCCESS && err != ASN1_MEM_ERROR)
1009             goto error;
1010
1011           max_len -= len2;
1012           counter += len2;
1013           move = RIGHT;
1014           break;
1015         case TYPE_OCTET_STRING:
1016           if (p->value == NULL)
1017             {
1018               _asn1_error_description_value_not_found (p, ErrorDescription);
1019               err = ASN1_VALUE_NOT_FOUND;
1020               goto error;
1021             }
1022           len2 = asn1_get_length_der (p->value, p->value_len, &len3);
1023           if (len2 < 0)
1024             {
1025               err = ASN1_DER_ERROR;
1026               goto error;
1027             }
1028           max_len -= len2 + len3;
1029           if (max_len >= 0)
1030             memcpy (der + counter, p->value, len3 + len2);
1031           counter += len3 + len2;
1032           move = RIGHT;
1033           break;
1034         case TYPE_GENERALSTRING:
1035           if (p->value == NULL)
1036             {
1037               _asn1_error_description_value_not_found (p, ErrorDescription);
1038               err = ASN1_VALUE_NOT_FOUND;
1039               goto error;
1040             }
1041           len2 = asn1_get_length_der (p->value, p->value_len, &len3);
1042           if (len2 < 0)
1043             {
1044               err = ASN1_DER_ERROR;
1045               goto error;
1046             }
1047           max_len -= len2 + len3;
1048           if (max_len >= 0)
1049             memcpy (der + counter, p->value, len3 + len2);
1050           counter += len3 + len2;
1051           move = RIGHT;
1052           break;
1053         case TYPE_BIT_STRING:
1054           if (p->value == NULL)
1055             {
1056               _asn1_error_description_value_not_found (p, ErrorDescription);
1057               err = ASN1_VALUE_NOT_FOUND;
1058               goto error;
1059             }
1060           len2 = asn1_get_length_der (p->value, p->value_len, &len3);
1061           if (len2 < 0)
1062             {
1063               err = ASN1_DER_ERROR;
1064               goto error;
1065             }
1066           max_len -= len2 + len3;
1067           if (max_len >= 0)
1068             memcpy (der + counter, p->value, len3 + len2);
1069           counter += len3 + len2;
1070           move = RIGHT;
1071           break;
1072         case TYPE_SEQUENCE:
1073         case TYPE_SET:
1074           if (move != UP)
1075             {
1076               _asn1_ltostr (counter, (char *) temp);
1077               tlen = _asn1_strlen (temp);
1078               if (tlen > 0)
1079                 _asn1_set_value (p, temp, tlen + 1);
1080               if (p->down == NULL)
1081                 {
1082                   move = UP;
1083                   continue;
1084                 }
1085               else
1086                 {
1087                   p2 = p->down;
1088                   while (p2 && (type_field (p2->type) == TYPE_TAG))
1089                     p2 = p2->right;
1090                   if (p2)
1091                     {
1092                       p = p2;
1093                       move = RIGHT;
1094                       continue;
1095                     }
1096                   move = UP;
1097                   continue;
1098                 }
1099             }
1100           else
1101             {                   /* move==UP */
1102               len2 = _asn1_strtol (p->value, NULL, 10);
1103               _asn1_set_value (p, NULL, 0);
1104               if ((type_field (p->type) == TYPE_SET) && (max_len >= 0))
1105                 _asn1_ordering_set (der + len2, max_len - len2, p);
1106               asn1_length_der (counter - len2, temp, &len3);
1107               max_len -= len3;
1108               if (max_len >= 0)
1109                 {
1110                   memmove (der + len2 + len3, der + len2, counter - len2);
1111                   memcpy (der + len2, temp, len3);
1112                 }
1113               counter += len3;
1114               move = RIGHT;
1115             }
1116           break;
1117         case TYPE_SEQUENCE_OF:
1118         case TYPE_SET_OF:
1119           if (move != UP)
1120             {
1121               _asn1_ltostr (counter, (char *) temp);
1122               tlen = _asn1_strlen (temp);
1123
1124               if (tlen > 0)
1125                 _asn1_set_value (p, temp, tlen + 1);
1126               p = p->down;
1127               while ((type_field (p->type) == TYPE_TAG)
1128                      || (type_field (p->type) == TYPE_SIZE))
1129                 p = p->right;
1130               if (p->right)
1131                 {
1132                   p = p->right;
1133                   move = RIGHT;
1134                   continue;
1135                 }
1136               else
1137                 p = _asn1_find_up (p);
1138               move = UP;
1139             }
1140           if (move == UP)
1141             {
1142               len2 = _asn1_strtol (p->value, NULL, 10);
1143               _asn1_set_value (p, NULL, 0);
1144               if ((type_field (p->type) == TYPE_SET_OF)
1145                   && (max_len - len2 > 0))
1146                 {
1147                   _asn1_ordering_set_of (der + len2, max_len - len2, p);
1148                 }
1149               asn1_length_der (counter - len2, temp, &len3);
1150               max_len -= len3;
1151               if (max_len >= 0)
1152                 {
1153                   memmove (der + len2 + len3, der + len2, counter - len2);
1154                   memcpy (der + len2, temp, len3);
1155                 }
1156               counter += len3;
1157               move = RIGHT;
1158             }
1159           break;
1160         case TYPE_ANY:
1161           if (p->value == NULL)
1162             {
1163               _asn1_error_description_value_not_found (p, ErrorDescription);
1164               err = ASN1_VALUE_NOT_FOUND;
1165               goto error;
1166             }
1167           len2 = asn1_get_length_der (p->value, p->value_len, &len3);
1168           if (len2 < 0)
1169             {
1170               err = ASN1_DER_ERROR;
1171               goto error;
1172             }
1173           max_len -= len2;
1174           if (max_len >= 0)
1175             memcpy (der + counter, p->value + len3, len2);
1176           counter += len2;
1177           move = RIGHT;
1178           break;
1179         default:
1180           move = (move == UP) ? RIGHT : DOWN;
1181           break;
1182         }
1183
1184       if ((move != DOWN) && (counter != counter_old))
1185         {
1186           err = _asn1_complete_explicit_tag (p, der, &counter, &max_len);
1187           if (err != ASN1_SUCCESS && err != ASN1_MEM_ERROR)
1188             goto error;
1189         }
1190
1191       if (p == node && move != DOWN)
1192         break;
1193
1194       if (move == DOWN)
1195         {
1196           if (p->down)
1197             p = p->down;
1198           else
1199             move = RIGHT;
1200         }
1201       if (move == RIGHT)
1202         {
1203           if (p->right)
1204             p = p->right;
1205           else
1206             move = UP;
1207         }
1208       if (move == UP)
1209         p = _asn1_find_up (p);
1210     }
1211
1212   *len = counter;
1213
1214   if (max_len < 0)
1215     {
1216       err = ASN1_MEM_ERROR;
1217       goto error;
1218     }
1219
1220   err = ASN1_SUCCESS;
1221
1222 error:
1223   asn1_delete_structure (&node);
1224   return err;
1225 }