crypto/asn1/tasn_enc.c

   1 /* tasn_enc.c */
   2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
   3  * project 2000.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2000-2004 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59
  60 #include <stddef.h>
  61 #include <string.h>
  62 #include <openssl/asn1.h>
  63 #include <openssl/asn1t.h>
  64 #include <openssl/objects.h>
  65
  66 static int asn1_i2d_ex_primitive(ASN1_VALUE **pval, unsigned char **out,
  67                                         const ASN1_ITEM *it,
  68                                         int tag, int aclass);
  69 static int asn1_set_seq_out(STACK_OF(ASN1_VALUE) *sk, unsigned char **out,
  70                                         int skcontlen, const ASN1_ITEM *item,
  71                                         int do_sort, int iclass);
  72 static int asn1_template_ex_i2d(ASN1_VALUE **pval, unsigned char **out,
  73                                         const ASN1_TEMPLATE *tt,
  74                                         int tag, int aclass);
  75 static int asn1_item_flags_i2d(ASN1_VALUE *val, unsigned char **out,
  76                                         const ASN1_ITEM *it, int flags);
  77
  78 /* Top level i2d equivalents: the 'ndef' variant instructs the encoder
  79  * to use indefinite length constructed encoding, where appropriate
  80  */
  81
  82 int ASN1_item_ndef_i2d(ASN1_VALUE *val, unsigned char **out,
  83                                                 const ASN1_ITEM *it)
  84         {
  85         return asn1_item_flags_i2d(val, out, it, ASN1_TFLG_NDEF);
  86         }
  87
  88 int ASN1_item_i2d(ASN1_VALUE *val, unsigned char **out, const ASN1_ITEM *it)
  89         {
  90         return asn1_item_flags_i2d(val, out, it, 0);
  91         }
  92
  93 /* Encode an ASN1 item, this is use by the
  94  * standard 'i2d' function. 'out' points to
  95  * a buffer to output the data to.
  96  *
  97  * The new i2d has one additional feature. If the output
  98  * buffer is NULL (i.e. *out == NULL) then a buffer is
  99  * allocated and populated with the encoding.
 100  */
 101
 102 static int asn1_item_flags_i2d(ASN1_VALUE *val, unsigned char **out,
 103                                         const ASN1_ITEM *it, int flags)
 104         {
 105         if (out && !*out)
 106                 {
 107                 unsigned char *p, *buf;
 108                 int len;
 109                 len = ASN1_item_ex_i2d(&val, NULL, it, -1, flags);
 110                 if (len <= 0)
 111                         return len;
 112                 buf = OPENSSL_malloc(len);
 113                 if (!buf)
 114                         return -1;
 115                 p = buf;
 116                 ASN1_item_ex_i2d(&val, &p, it, -1, flags);
 117                 *out = buf;
 118                 return len;
 119                 }
 120
 121         return ASN1_item_ex_i2d(&val, out, it, -1, flags);
 122         }
 123
 124 /* Encode an item, taking care of IMPLICIT tagging (if any).
 125  * This function performs the normal item handling: it can be
 126  * used in external types.
 127  */
 128
 129 int ASN1_item_ex_i2d(ASN1_VALUE **pval, unsigned char **out,
 130                         const ASN1_ITEM *it, int tag, int aclass)
 131         {
 132         const ASN1_TEMPLATE *tt = NULL;
 133         unsigned char *p = NULL;
 134         int i, seqcontlen, seqlen, ndef = 1;
 135         const ASN1_COMPAT_FUNCS *cf;
 136         const ASN1_EXTERN_FUNCS *ef;
 137         const ASN1_AUX *aux = it->funcs;
 138         ASN1_aux_cb *asn1_cb = 0;
 139
 140         if ((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval)
 141                 return 0;
 142
 143         if (aux && aux->asn1_cb)
 144                  asn1_cb = aux->asn1_cb;
 145
 146         switch(it->itype)
 147                 {
 148
 149                 case ASN1_ITYPE_PRIMITIVE:
 150                 if (it->templates)
 151                         return asn1_template_ex_i2d(pval, out, it->templates,
 152                                                                 tag, aclass);
 153                 return asn1_i2d_ex_primitive(pval, out, it, tag, aclass);
 154                 break;
 155
 156                 case ASN1_ITYPE_MSTRING:
 157                 return asn1_i2d_ex_primitive(pval, out, it, -1, aclass);
 158
 159                 case ASN1_ITYPE_CHOICE:
 160                 if (asn1_cb && !asn1_cb(ASN1_OP_I2D_PRE, pval, it, NULL))
 161                                 return 0;
 162                 i = asn1_get_choice_selector(pval, it);
 163                 if ((i >= 0) && (i < it->tcount))
 164                         {
 165                         ASN1_VALUE **pchval;
 166                         const ASN1_TEMPLATE *chtt;
 167                         chtt = it->templates + i;
 168                         pchval = asn1_get_field_ptr(pval, chtt);
 169                         return asn1_template_ex_i2d(pchval, out, chtt,
 170                                                                 -1, aclass);
 171                         }
 172                 /* Fixme: error condition if selector out of range */
 173                 if (asn1_cb && !asn1_cb(ASN1_OP_I2D_POST, pval, it, NULL))
 174                                 return 0;
 175                 break;
 176
 177                 case ASN1_ITYPE_EXTERN:
 178                 /* If new style i2d it does all the work */
 179                 ef = it->funcs;
 180                 return ef->asn1_ex_i2d(pval, out, it, tag, aclass);
 181
 182                 case ASN1_ITYPE_COMPAT:
 183                 /* old style hackery... */
 184                 cf = it->funcs;
 185                 if (out)
 186                         p = *out;
 187                 i = cf->asn1_i2d(*pval, out);
 188                 /* Fixup for IMPLICIT tag: note this messes up for tags > 30,
 189                  * but so did the old code. Tags > 30 are very rare anyway.
 190                  */
 191                 if (out && (tag != -1))
 192                         *p = aclass | tag | (*p & V_ASN1_CONSTRUCTED);
 193                 return i;
 194
 195                 case ASN1_ITYPE_NDEF_SEQUENCE:
 196                 /* Use indefinite length constructed if requested */
 197                 if (aclass & ASN1_TFLG_NDEF) ndef = 2;
 198                 /* fall through */
 199
 200                 case ASN1_ITYPE_SEQUENCE:
 201                 i = asn1_enc_restore(&seqcontlen, out, pval, it);
 202                 /* An error occurred */
 203                 if (i < 0)
 204                         return 0;
 205                 /* We have a valid cached encoding... */
 206                 if (i > 0)
 207                         return seqcontlen;
 208                 /* Otherwise carry on */
 209                 seqcontlen = 0;
 210                 /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
 211                 if (tag == -1)
 212                         {
 213                         tag = V_ASN1_SEQUENCE;
 214                         /* Retain any other flags in aclass */
 215                         aclass = (aclass & ~ASN1_TFLG_TAG_CLASS)
 216                                         | V_ASN1_UNIVERSAL;
 217                         }
 218                 if (asn1_cb && !asn1_cb(ASN1_OP_I2D_PRE, pval, it, NULL))
 219                                 return 0;
 220                 /* First work out sequence content length */
 221                 for (i = 0, tt = it->templates; i < it->tcount; tt++, i++)
 222                         {
 223                         const ASN1_TEMPLATE *seqtt;
 224                         ASN1_VALUE **pseqval;
 225                         seqtt = asn1_do_adb(pval, tt, 1);
 226                         if (!seqtt)
 227                                 return 0;
 228                         pseqval = asn1_get_field_ptr(pval, seqtt);
 229                         /* FIXME: check for errors in enhanced version */
 230                         seqcontlen += asn1_template_ex_i2d(pseqval, NULL, seqtt,
 231                                                                 -1, aclass);
 232                         }
 233
 234                 seqlen = ASN1_object_size(ndef, seqcontlen, tag);
 235                 if (!out)
 236                         return seqlen;
 237                 /* Output SEQUENCE header */
 238                 ASN1_put_object(out, ndef, seqcontlen, tag, aclass);
 239                 for (i = 0, tt = it->templates; i < it->tcount; tt++, i++)
 240                         {
 241                         const ASN1_TEMPLATE *seqtt;
 242                         ASN1_VALUE **pseqval;
 243                         seqtt = asn1_do_adb(pval, tt, 1);
 244                         if (!seqtt)
 245                                 return 0;
 246                         pseqval = asn1_get_field_ptr(pval, seqtt);
 247                         /* FIXME: check for errors in enhanced version */
 248                         asn1_template_ex_i2d(pseqval, out, seqtt, -1, aclass);
 249                         }
 250                 if (ndef == 2)
 251                         ASN1_put_eoc(out);
 252                 if (asn1_cb && !asn1_cb(ASN1_OP_I2D_POST, pval, it, NULL))
 253                                 return 0;
 254                 return seqlen;
 255
 256                 default:
 257                 return 0;
 258
 259                 }
 260         return 0;
 261         }
 262
 263 int ASN1_template_i2d(ASN1_VALUE **pval, unsigned char **out,
 264                                                         const ASN1_TEMPLATE *tt)
 265         {
 266         return asn1_template_ex_i2d(pval, out, tt, -1, 0);
 267         }
 268
 269 static int asn1_template_ex_i2d(ASN1_VALUE **pval, unsigned char **out,
 270                                 const ASN1_TEMPLATE *tt, int tag, int iclass)
 271         {
 272         int i, ret, flags, ttag, tclass, ndef;
 273         flags = tt->flags;
 274         /* Work out tag and class to use: tagging may come
 275          * either from the template or the arguments, not both
 276          * because this would create ambiguity. Additionally
 277          * the iclass argument may contain some additional flags
 278          * which should be noted and passed down to other levels.
 279          */
 280         if (flags & ASN1_TFLG_TAG_MASK)
 281                 {
 282                 /* Error if argument and template tagging */
 283                 if (tag != -1)
 284                         /* FIXME: error code here */
 285                         return -1;
 286                 /* Get tagging from template */
 287                 ttag = tt->tag;
 288                 tclass = flags & ASN1_TFLG_TAG_CLASS;
 289                 }
 290         else if (tag != -1)
 291                 {
 292                 /* No template tagging, get from arguments */
 293                 ttag = tag;
 294                 tclass = iclass & ASN1_TFLG_TAG_CLASS;
 295                 }
 296         else
 297                 {
 298                 ttag = -1;
 299                 tclass = 0;
 300                 }
 301         /*
 302          * Remove any class mask from iflag.
 303          */
 304         iclass &= ~ASN1_TFLG_TAG_CLASS;
 305
 306         /* At this point 'ttag' contains the outer tag to use,
 307          * 'tclass' is the class and iclass is any flags passed
 308          * to this function.
 309          */
 310
 311         /* if template and arguments require ndef, use it */
 312         if ((flags & ASN1_TFLG_NDEF) && (iclass & ASN1_TFLG_NDEF))
 313                 ndef = 2;
 314         else ndef = 1;
 315
 316         if (flags & ASN1_TFLG_SK_MASK)
 317                 {
 318                 /* SET OF, SEQUENCE OF */
 319                 STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
 320                 int isset, sktag, skaclass;
 321                 int skcontlen, sklen;
 322                 ASN1_VALUE *skitem;
 323
 324                 if (!*pval)
 325                         return 0;
 326
 327                 if (flags & ASN1_TFLG_SET_OF)
 328                         {
 329                         isset = 1;
 330                         /* 2 means we reorder */
 331                         if (flags & ASN1_TFLG_SEQUENCE_OF)
 332                                 isset = 2;
 333                         }
 334                 else isset = 0;
 335
 336                 /* Work out inner tag value: if EXPLICIT
 337                  * or no tagging use underlying type.
 338                  */
 339                 if ((ttag != -1) && !(flags & ASN1_TFLG_EXPTAG))
 340                         {
 341                         sktag = ttag;
 342                         skaclass = tclass;
 343                         }
 344                 else
 345                         {
 346                         skaclass = V_ASN1_UNIVERSAL;
 347                         if (isset)
 348                                 sktag = V_ASN1_SET;
 349                         else sktag = V_ASN1_SEQUENCE;
 350                         }
 351
 352                 /* Determine total length of items */
 353                 skcontlen = 0;
 354                 for (i = 0; i < sk_ASN1_VALUE_num(sk); i++)
 355                         {
 356                         skitem = sk_ASN1_VALUE_value(sk, i);
 357                         skcontlen += ASN1_item_ex_i2d(&skitem, NULL,
 358                                                 ASN1_ITEM_ptr(tt->item),
 359                                                         -1, iclass);
 360                         }
 361                 sklen = ASN1_object_size(ndef, skcontlen, sktag);
 362                 /* If EXPLICIT need length of surrounding tag */
 363                 if (flags & ASN1_TFLG_EXPTAG)
 364                         ret = ASN1_object_size(ndef, sklen, ttag);
 365                 else ret = sklen;
 366
 367                 if (!out)
 368                         return ret;
 369
 370                 /* Now encode this lot... */
 371                 /* EXPLICIT tag */
 372                 if (flags & ASN1_TFLG_EXPTAG)
 373                         ASN1_put_object(out, ndef, sklen, ttag, tclass);
 374                 /* SET or SEQUENCE and IMPLICIT tag */
 375                 ASN1_put_object(out, ndef, skcontlen, sktag, skaclass);
 376                 /* And the stuff itself */
 377                 asn1_set_seq_out(sk, out, skcontlen, ASN1_ITEM_ptr(tt->item),
 378                                                                 isset, iclass);
 379                 if (ndef == 2)
 380                         {
 381                         ASN1_put_eoc(out);
 382                         if (flags & ASN1_TFLG_EXPTAG)
 383                                 ASN1_put_eoc(out);
 384                         }
 385
 386                 return ret;
 387                 }
 388
 389         if (flags & ASN1_TFLG_EXPTAG)
 390                 {
 391                 /* EXPLICIT tagging */
 392                 /* Find length of tagged item */
 393                 i = ASN1_item_ex_i2d(pval, NULL, ASN1_ITEM_ptr(tt->item),
 394                                                                 -1, iclass);
 395                 if (!i)
 396                         return 0;
 397                 /* Find length of EXPLICIT tag */
 398                 ret = ASN1_object_size(ndef, i, ttag);
 399                 if (out)
 400                         {
 401                         /* Output tag and item */
 402                         ASN1_put_object(out, ndef, i, ttag, tclass);
 403                         ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item),
 404                                                                 -1, iclass);
 405                         if (ndef == 2)
 406                                 ASN1_put_eoc(out);
 407                         }
 408                 return ret;
 409                 }
 410
 411         /* Either normal or IMPLICIT tagging: combine class and flags */
 412         return ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item),
 413                                                 ttag, tclass | iclass);
 414
 415 }
 416
 417 /* Temporary structure used to hold DER encoding of items for SET OF */
 418
 419 typedef struct {
 420         unsigned char *data;
 421         int length;
 422         ASN1_VALUE *field;
 423 } DER_ENC;
 424
 425 static int der_cmp(const void *a, const void *b)
 426         {
 427         const DER_ENC *d1 = a, *d2 = b;
 428         int cmplen, i;
 429         cmplen = (d1->length < d2->length) ? d1->length : d2->length;
 430         i = memcmp(d1->data, d2->data, cmplen);
 431         if (i)
 432                 return i;
 433         return d1->length - d2->length;
 434         }
 435
 436 /* Output the content octets of SET OF or SEQUENCE OF */
 437
 438 static int asn1_set_seq_out(STACK_OF(ASN1_VALUE) *sk, unsigned char **out,
 439                                         int skcontlen, const ASN1_ITEM *item,
 440                                         int do_sort, int iclass)
 441         {
 442         int i;
 443         ASN1_VALUE *skitem;
 444         unsigned char *tmpdat = NULL, *p = NULL;
 445         DER_ENC *derlst = NULL, *tder;
 446         if (do_sort)
 447                  {
 448                 /* Don't need to sort less than 2 items */
 449                 if (sk_ASN1_VALUE_num(sk) < 2)
 450                         do_sort = 0;
 451                 else
 452                         {
 453                         derlst = OPENSSL_malloc(sk_ASN1_VALUE_num(sk)
 454                                                 * sizeof(*derlst));
 455                         tmpdat = OPENSSL_malloc(skcontlen);
 456                         if (!derlst || !tmpdat)
 457                                 return 0;
 458                         }
 459                 }
 460         /* If not sorting just output each item */
 461         if (!do_sort)
 462                 {
 463                 for (i = 0; i < sk_ASN1_VALUE_num(sk); i++)
 464                         {
 465                         skitem = sk_ASN1_VALUE_value(sk, i);
 466                         ASN1_item_ex_i2d(&skitem, out, item, -1, iclass);
 467                         }
 468                 return 1;
 469                 }
 470         p = tmpdat;
 471
 472         /* Doing sort: build up a list of each member's DER encoding */
 473         for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++)
 474                 {
 475                 skitem = sk_ASN1_VALUE_value(sk, i);
 476                 tder->data = p;
 477                 tder->length = ASN1_item_ex_i2d(&skitem, &p, item, -1, iclass);
 478                 tder->field = skitem;
 479                 }
 480
 481         /* Now sort them */
 482         qsort(derlst, sk_ASN1_VALUE_num(sk), sizeof(*derlst), der_cmp);
 483         /* Output sorted DER encoding */
 484         p = *out;
 485         for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++)
 486                 {
 487                 memcpy(p, tder->data, tder->length);
 488                 p += tder->length;
 489                 }
 490         *out = p;
 491         /* If do_sort is 2 then reorder the STACK */
 492         if (do_sort == 2)
 493                 {
 494                 for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk);
 495                                                         i++, tder++)
 496                         sk_ASN1_VALUE_set(sk, i, tder->field);
 497                 }
 498         OPENSSL_free(derlst);
 499         OPENSSL_free(tmpdat);
 500         return 1;
 501         }
 502
 503 static int asn1_i2d_ex_primitive(ASN1_VALUE **pval, unsigned char **out,
 504                                 const ASN1_ITEM *it, int tag, int aclass)
 505         {
 506         int len;
 507         int utype;
 508         int usetag;
 509         int ndef = 0;
 510
 511         utype = it->utype;
 512
 513         /* Get length of content octets and maybe find
 514          * out the underlying type.
 515          */
 516
 517         len = asn1_ex_i2c(pval, NULL, &utype, it);
 518
 519         /* If SEQUENCE, SET or OTHER then header is
 520          * included in pseudo content octets so don't
 521          * include tag+length. We need to check here
 522          * because the call to asn1_ex_i2c() could change
 523          * utype.
 524          */
 525         if ((utype == V_ASN1_SEQUENCE) || (utype == V_ASN1_SET) ||
 526            (utype == V_ASN1_OTHER))
 527                 usetag = 0;
 528         else usetag = 1;
 529
 530         /* -1 means omit type */
 531
 532         if (len == -1)
 533                 return 0;
 534
 535         /* -2 return is special meaning use ndef */
 536         if (len == -2)
 537                 {
 538                 ndef = 2;
 539                 len = 0;
 540                 }
 541
 542         /* If not implicitly tagged get tag from underlying type */
 543         if (tag == -1) tag = utype;
 544
 545         /* Output tag+length followed by content octets */
 546         if (out)
 547                 {
 548                 if (usetag)
 549                         ASN1_put_object(out, ndef, len, tag, aclass);
 550                 asn1_ex_i2c(pval, *out, &utype, it);
 551                 if (ndef)
 552                         ASN1_put_eoc(out);
 553                 else
 554                         *out += len;
 555                 }
 556
 557         if (usetag)
 558                 return ASN1_object_size(ndef, len, tag);
 559         return len;
 560         }
 561
 562 /* Produce content octets from a structure */
 563
 564 int asn1_ex_i2c(ASN1_VALUE **pval, unsigned char *cout, int *putype,
 565                                 const ASN1_ITEM *it)
 566         {
 567         ASN1_BOOLEAN *tbool = NULL;
 568         ASN1_STRING *strtmp;
 569         ASN1_OBJECT *otmp;
 570         int utype;
 571         unsigned char *cont, c;
 572         int len;
 573         const ASN1_PRIMITIVE_FUNCS *pf;
 574         pf = it->funcs;
 575         if (pf && pf->prim_i2c)
 576                 return pf->prim_i2c(pval, cout, putype, it);
 577
 578         /* Should type be omitted? */
 579         if ((it->itype != ASN1_ITYPE_PRIMITIVE)
 580                 || (it->utype != V_ASN1_BOOLEAN))
 581                 {
 582                 if (!*pval) return -1;
 583                 }
 584
 585         if (it->itype == ASN1_ITYPE_MSTRING)
 586                 {
 587                 /* If MSTRING type set the underlying type */
 588                 strtmp = (ASN1_STRING *)*pval;
 589                 utype = strtmp->type;
 590                 *putype = utype;
 591                 }
 592         else if (it->utype == V_ASN1_ANY)
 593                 {
 594                 /* If ANY set type and pointer to value */
 595                 ASN1_TYPE *typ;
 596                 typ = (ASN1_TYPE *)*pval;
 597                 utype = typ->type;
 598                 *putype = utype;
 599                 pval = (ASN1_VALUE **)&typ->value.ptr;
 600                 }
 601         else utype = *putype;
 602
 603         switch(utype)
 604                 {
 605                 case V_ASN1_OBJECT:
 606                 otmp = (ASN1_OBJECT *)*pval;
 607                 cont = otmp->data;
 608                 len = otmp->length;
 609                 break;
 610
 611                 case V_ASN1_NULL:
 612                 cont = NULL;
 613                 len = 0;
 614                 break;
 615
 616                 case V_ASN1_BOOLEAN:
 617                 tbool = (ASN1_BOOLEAN *)pval;
 618                 if (*tbool == -1)
 619                         return -1;
 620                 /* Default handling if value == size field then omit */
 621                 if (*tbool && (it->size > 0))
 622                         return -1;
 623                 if (!*tbool && !it->size)
 624                         return -1;
 625                 c = (unsigned char)*tbool;
 626                 cont = &c;
 627                 len = 1;
 628                 break;
 629
 630                 case V_ASN1_BIT_STRING:
 631                 return i2c_ASN1_BIT_STRING((ASN1_BIT_STRING *)*pval,
 632                                                         cout ? &cout : NULL);
 633                 break;
 634
 635                 case V_ASN1_INTEGER:
 636                 case V_ASN1_NEG_INTEGER:
 637                 case V_ASN1_ENUMERATED:
 638                 case V_ASN1_NEG_ENUMERATED:
 639                 /* These are all have the same content format
 640                  * as ASN1_INTEGER
 641                  */
 642                 return i2c_ASN1_INTEGER((ASN1_INTEGER *)*pval,
 643                                                         cout ? &cout : NULL);
 644                 break;
 645
 646                 case V_ASN1_OCTET_STRING:
 647                 case V_ASN1_NUMERICSTRING:
 648                 case V_ASN1_PRINTABLESTRING:
 649                 case V_ASN1_T61STRING:
 650                 case V_ASN1_VIDEOTEXSTRING:
 651                 case V_ASN1_IA5STRING:
 652                 case V_ASN1_UTCTIME:
 653                 case V_ASN1_GENERALIZEDTIME:
 654                 case V_ASN1_GRAPHICSTRING:
 655                 case V_ASN1_VISIBLESTRING:
 656                 case V_ASN1_GENERALSTRING:
 657                 case V_ASN1_UNIVERSALSTRING:
 658                 case V_ASN1_BMPSTRING:
 659                 case V_ASN1_UTF8STRING:
 660                 case V_ASN1_SEQUENCE:
 661                 case V_ASN1_SET:
 662                 default:
 663                 /* All based on ASN1_STRING and handled the same */
 664                 strtmp = (ASN1_STRING *)*pval;
 665                 /* Special handling for NDEF */
 666                 if ((it->size == ASN1_TFLG_NDEF)
 667                         && (strtmp->flags & ASN1_STRING_FLAG_NDEF))
 668                         {
 669                         if (cout)
 670                                 {
 671                                 strtmp->data = cout;
 672                                 strtmp->length = 0;
 673                                 }
 674                         /* Special return code */
 675                         return -2;
 676                         }
 677                 cont = strtmp->data;
 678                 len = strtmp->length;
 679
 680                 break;
 681
 682                 }
 683         if (cout && len)
 684                 memcpy(cout, cont, len);
 685         return len;
 686         }