crypto/openssl-0.9/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 "cryptlib.h"
  63 #include <openssl/asn1.h>
  64 #include <openssl/asn1t.h>
  65 #include <openssl/objects.h>
  66
  67 static int asn1_i2d_ex_primitive(ASN1_VALUE **pval, unsigned char **out,
  68                                         const ASN1_ITEM *it,
  69                                         int tag, int aclass);
  70 static int asn1_set_seq_out(STACK_OF(ASN1_VALUE) *sk, unsigned char **out,
  71                                         int skcontlen, const ASN1_ITEM *item,
  72                                         int do_sort, int iclass);
  73 static int asn1_template_ex_i2d(ASN1_VALUE **pval, unsigned char **out,
  74                                         const ASN1_TEMPLATE *tt,
  75                                         int tag, int aclass);
  76 static int asn1_item_flags_i2d(ASN1_VALUE *val, unsigned char **out,
  77                                         const ASN1_ITEM *it, int flags);
  78
  79 /* Top level i2d equivalents: the 'ndef' variant instructs the encoder
  80  * to use indefinite length constructed encoding, where appropriate
  81  */
  82
  83 int ASN1_item_ndef_i2d(ASN1_VALUE *val, unsigned char **out,
  84                                                 const ASN1_ITEM *it)
  85         {
  86         return asn1_item_flags_i2d(val, out, it, ASN1_TFLG_NDEF);
  87         }
  88
  89 int ASN1_item_i2d(ASN1_VALUE *val, unsigned char **out, const ASN1_ITEM *it)
  90         {
  91         return asn1_item_flags_i2d(val, out, it, 0);
  92         }
  93
  94 /* Encode an ASN1 item, this is use by the
  95  * standard 'i2d' function. 'out' points to
  96  * a buffer to output the data to.
  97  *
  98  * The new i2d has one additional feature. If the output
  99  * buffer is NULL (i.e. *out == NULL) then a buffer is
 100  * allocated and populated with the encoding.
 101  */
 102
 103 static int asn1_item_flags_i2d(ASN1_VALUE *val, unsigned char **out,
 104                                         const ASN1_ITEM *it, int flags)
 105         {
 106         if (out && !*out)
 107                 {
 108                 unsigned char *p, *buf;
 109                 int len;
 110                 len = ASN1_item_ex_i2d(&val, NULL, it, -1, flags);
 111                 if (len <= 0)
 112                         return len;
 113                 buf = OPENSSL_malloc(len);
 114                 if (!buf)
 115                         return -1;
 116                 p = buf;
 117                 ASN1_item_ex_i2d(&val, &p, it, -1, flags);
 118                 *out = buf;
 119                 return len;
 120                 }
 121
 122         return ASN1_item_ex_i2d(&val, out, it, -1, flags);
 123         }
 124
 125 /* Encode an item, taking care of IMPLICIT tagging (if any).
 126  * This function performs the normal item handling: it can be
 127  * used in external types.
 128  */
 129
 130 int ASN1_item_ex_i2d(ASN1_VALUE **pval, unsigned char **out,
 131                         const ASN1_ITEM *it, int tag, int aclass)
 132         {
 133         const ASN1_TEMPLATE *tt = NULL;
 134         unsigned char *p = NULL;
 135         int i, seqcontlen, seqlen, ndef = 1;
 136         const ASN1_COMPAT_FUNCS *cf;
 137         const ASN1_EXTERN_FUNCS *ef;
 138         const ASN1_AUX *aux = it->funcs;
 139         ASN1_aux_cb *asn1_cb = 0;
 140
 141         if ((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval)
 142                 return 0;
 143
 144         if (aux && aux->asn1_cb)
 145                  asn1_cb = aux->asn1_cb;
 146
 147         switch(it->itype)
 148                 {
 149
 150                 case ASN1_ITYPE_PRIMITIVE:
 151                 if (it->templates)
 152                         return asn1_template_ex_i2d(pval, out, it->templates,
 153                                                                 tag, aclass);
 154                 return asn1_i2d_ex_primitive(pval, out, it, tag, aclass);
 155                 break;
 156
 157                 case ASN1_ITYPE_MSTRING:
 158                 return asn1_i2d_ex_primitive(pval, out, it, -1, aclass);
 159
 160                 case ASN1_ITYPE_CHOICE:
 161                 if (asn1_cb && !asn1_cb(ASN1_OP_I2D_PRE, pval, it))
 162                                 return 0;
 163                 i = asn1_get_choice_selector(pval, it);
 164                 if ((i >= 0) && (i < it->tcount))
 165                         {
 166                         ASN1_VALUE **pchval;
 167                         const ASN1_TEMPLATE *chtt;
 168                         chtt = it->templates + i;
 169                         pchval = asn1_get_field_ptr(pval, chtt);
 170                         return asn1_template_ex_i2d(pchval, out, chtt,
 171                                                                 -1, aclass);
 172                         }
 173                 /* Fixme: error condition if selector out of range */
 174                 if (asn1_cb && !asn1_cb(ASN1_OP_I2D_POST, pval, it))
 175                                 return 0;
 176                 break;
 177
 178                 case ASN1_ITYPE_EXTERN:
 179                 /* If new style i2d it does all the work */
 180                 ef = it->funcs;
 181                 return ef->asn1_ex_i2d(pval, out, it, tag, aclass);
 182
 183                 case ASN1_ITYPE_COMPAT:
 184                 /* old style hackery... */
 185                 cf = it->funcs;
 186                 if (out)
 187                         p = *out;
 188                 i = cf->asn1_i2d(*pval, out);
 189                 /* Fixup for IMPLICIT tag: note this messes up for tags > 30,
 190                  * but so did the old code. Tags > 30 are very rare anyway.
 191                  */
 192                 if (out && (tag != -1))
 193                         *p = aclass | tag | (*p & V_ASN1_CONSTRUCTED);
 194                 return i;
 195
 196                 case ASN1_ITYPE_NDEF_SEQUENCE:
 197                 /* Use indefinite length constructed if requested */
 198                 if (aclass & ASN1_TFLG_NDEF) ndef = 2;
 199                 /* fall through */
 200
 201                 case ASN1_ITYPE_SEQUENCE:
 202                 i = asn1_enc_restore(&seqcontlen, out, pval, it);
 203                 /* An error occurred */
 204                 if (i < 0)
 205                         return 0;
 206                 /* We have a valid cached encoding... */
 207                 if (i > 0)
 208                         return seqcontlen;
 209                 /* Otherwise carry on */
 210                 seqcontlen = 0;
 211                 /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
 212                 if (tag == -1)
 213                         {
 214                         tag = V_ASN1_SEQUENCE;
 215                         /* Retain any other flags in aclass */
 216                         aclass = (aclass & ~ASN1_TFLG_TAG_CLASS)
 217                                         | V_ASN1_UNIVERSAL;
 218                         }
 219                 if (asn1_cb && !asn1_cb(ASN1_OP_I2D_PRE, pval, it))
 220                                 return 0;
 221                 /* First work out sequence content length */
 222                 for (i = 0, tt = it->templates; i < it->tcount; tt++, i++)
 223                         {
 224                         const ASN1_TEMPLATE *seqtt;
 225                         ASN1_VALUE **pseqval;
 226                         seqtt = asn1_do_adb(pval, tt, 1);
 227                         if (!seqtt)
 228                                 return 0;
 229                         pseqval = asn1_get_field_ptr(pval, seqtt);
 230                         /* FIXME: check for errors in enhanced version */
 231                         seqcontlen += asn1_template_ex_i2d(pseqval, NULL, seqtt,
 232                                                                 -1, aclass);
 233                         }
 234
 235                 seqlen = ASN1_object_size(ndef, seqcontlen, tag);
 236                 if (!out)
 237                         return seqlen;
 238                 /* Output SEQUENCE header */
 239                 ASN1_put_object(out, ndef, seqcontlen, tag, aclass);
 240                 for (i = 0, tt = it->templates; i < it->tcount; tt++, i++)
 241                         {
 242                         const ASN1_TEMPLATE *seqtt;
 243                         ASN1_VALUE **pseqval;
 244                         seqtt = asn1_do_adb(pval, tt, 1);
 245                         if (!seqtt)
 246                                 return 0;
 247                         pseqval = asn1_get_field_ptr(pval, seqtt);
 248                         /* FIXME: check for errors in enhanced version */
 249                         asn1_template_ex_i2d(pseqval, out, seqtt, -1, aclass);
 250                         }
 251                 if (ndef == 2)
 252                         ASN1_put_eoc(out);
 253                 if (asn1_cb  && !asn1_cb(ASN1_OP_I2D_POST, pval, it))
 254                                 return 0;
 255                 return seqlen;
 256
 257                 default:
 258                 return 0;
 259
 260                 }
 261         return 0;
 262         }
 263
 264 int ASN1_template_i2d(ASN1_VALUE **pval, unsigned char **out,
 265                                                         const ASN1_TEMPLATE *tt)
 266         {
 267         return asn1_template_ex_i2d(pval, out, tt, -1, 0);
 268         }
 269
 270 static int asn1_template_ex_i2d(ASN1_VALUE **pval, unsigned char **out,
 271                                 const ASN1_TEMPLATE *tt, int tag, int iclass)
 272         {
 273         int i, ret, flags, ttag, tclass, ndef;
 274         flags = tt->flags;
 275         /* Work out tag and class to use: tagging may come
 276          * either from the template or the arguments, not both
 277          * because this would create ambiguity. Additionally
 278          * the iclass argument may contain some additional flags
 279          * which should be noted and passed down to other levels.
 280          */
 281         if (flags & ASN1_TFLG_TAG_MASK)
 282                 {
 283                 /* Error if argument and template tagging */
 284                 if (tag != -1)
 285                         /* FIXME: error code here */
 286                         return -1;
 287                 /* Get tagging from template */
 288                 ttag = tt->tag;
 289                 tclass = flags & ASN1_TFLG_TAG_CLASS;
 290                 }
 291         else if (tag != -1)
 292                 {
 293                 /* No template tagging, get from arguments */
 294                 ttag = tag;
 295                 tclass = iclass & ASN1_TFLG_TAG_CLASS;
 296                 }
 297         else
 298                 {
 299                 ttag = -1;
 300                 tclass = 0;
 301                 }
 302         /*
 303          * Remove any class mask from iflag.
 304          */
 305         iclass &= ~ASN1_TFLG_TAG_CLASS;
 306
 307         /* At this point 'ttag' contains the outer tag to use,
 308          * 'tclass' is the class and iclass is any flags passed
 309          * to this function.
 310          */
 311
 312         /* if template and arguments require ndef, use it */
 313         if ((flags & ASN1_TFLG_NDEF) && (iclass & ASN1_TFLG_NDEF))
 314                 ndef = 2;
 315         else ndef = 1;
 316
 317         if (flags & ASN1_TFLG_SK_MASK)
 318                 {
 319                 /* SET OF, SEQUENCE OF */
 320                 STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
 321                 int isset, sktag, skaclass;
 322                 int skcontlen, sklen;
 323                 ASN1_VALUE *skitem;
 324
 325                 if (!*pval)
 326                         return 0;
 327
 328                 if (flags & ASN1_TFLG_SET_OF)
 329                         {
 330                         isset = 1;
 331                         /* 2 means we reorder */
 332                         if (flags & ASN1_TFLG_SEQUENCE_OF)
 333                                 isset = 2;
 334                         }
 335                 else isset = 0;
 336
 337                 /* Work out inner tag value: if EXPLICIT
 338                  * or no tagging use underlying type.
 339                  */
 340                 if ((ttag != -1) && !(flags & ASN1_TFLG_EXPTAG))
 341                         {
 342                         sktag = ttag;
 343                         skaclass = tclass;
 344                         }
 345                 else
 346                         {
 347                         skaclass = V_ASN1_UNIVERSAL;
 348                         if (isset)
 349                                 sktag = V_ASN1_SET;
 350                         else sktag = V_ASN1_SEQUENCE;
 351                         }
 352
 353                 /* Determine total length of items */
 354                 skcontlen = 0;
 355                 for (i = 0; i < sk_ASN1_VALUE_num(sk); i++)
 356                         {
 357                         skitem = sk_ASN1_VALUE_value(sk, i);
 358                         skcontlen += ASN1_item_ex_i2d(&skitem, NULL,
 359                                                 ASN1_ITEM_ptr(tt->item),
 360                                                         -1, iclass);
 361                         }
 362                 sklen = ASN1_object_size(ndef, skcontlen, sktag);
 363                 /* If EXPLICIT need length of surrounding tag */
 364                 if (flags & ASN1_TFLG_EXPTAG)
 365                         ret = ASN1_object_size(ndef, sklen, ttag);
 366                 else ret = sklen;
 367
 368                 if (!out)
 369                         return ret;
 370
 371                 /* Now encode this lot... */
 372                 /* EXPLICIT tag */
 373                 if (flags & ASN1_TFLG_EXPTAG)
 374                         ASN1_put_object(out, ndef, sklen, ttag, tclass);
 375                 /* SET or SEQUENCE and IMPLICIT tag */
 376                 ASN1_put_object(out, ndef, skcontlen, sktag, skaclass);
 377                 /* And the stuff itself */
 378                 asn1_set_seq_out(sk, out, skcontlen, ASN1_ITEM_ptr(tt->item),
 379                                                                 isset, iclass);
 380                 if (ndef == 2)
 381                         {
 382                         ASN1_put_eoc(out);
 383                         if (flags & ASN1_TFLG_EXPTAG)
 384                                 ASN1_put_eoc(out);
 385                         }
 386
 387                 return ret;
 388                 }
 389
 390         if (flags & ASN1_TFLG_EXPTAG)
 391                 {
 392                 /* EXPLICIT tagging */
 393                 /* Find length of tagged item */
 394                 i = ASN1_item_ex_i2d(pval, NULL, ASN1_ITEM_ptr(tt->item),
 395                                                                 -1, iclass);
 396                 if (!i)
 397                         return 0;
 398                 /* Find length of EXPLICIT tag */
 399                 ret = ASN1_object_size(ndef, i, ttag);
 400                 if (out)
 401                         {
 402                         /* Output tag and item */
 403                         ASN1_put_object(out, ndef, i, ttag, tclass);
 404                         ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item),
 405                                                                 -1, iclass);
 406                         if (ndef == 2)
 407                                 ASN1_put_eoc(out);
 408                         }
 409                 return ret;
 410                 }
 411
 412         /* Either normal or IMPLICIT tagging: combine class and flags */
 413         return ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item),
 414                                                 ttag, tclass | iclass);
 415
 416 }
 417
 418 /* Temporary structure used to hold DER encoding of items for SET OF */
 419
 420 typedef struct {
 421         unsigned char *data;
 422         int length;
 423         ASN1_VALUE *field;
 424 } DER_ENC;
 425
 426 static int der_cmp(const void *a, const void *b)
 427         {
 428         const DER_ENC *d1 = a, *d2 = b;
 429         int cmplen, i;
 430         cmplen = (d1->length < d2->length) ? d1->length : d2->length;
 431         i = memcmp(d1->data, d2->data, cmplen);
 432         if (i)
 433                 return i;
 434         return d1->length - d2->length;
 435         }
 436
 437 /* Output the content octets of SET OF or SEQUENCE OF */
 438
 439 static int asn1_set_seq_out(STACK_OF(ASN1_VALUE) *sk, unsigned char **out,
 440                                         int skcontlen, const ASN1_ITEM *item,
 441                                         int do_sort, int iclass)
 442         {
 443         int i;
 444         ASN1_VALUE *skitem;
 445         unsigned char *tmpdat = NULL, *p = NULL;
 446         DER_ENC *derlst = NULL, *tder;
 447         if (do_sort)
 448                  {
 449                 /* Don't need to sort less than 2 items */
 450                 if (sk_ASN1_VALUE_num(sk) < 2)
 451                         do_sort = 0;
 452                 else
 453                         {
 454                         derlst = OPENSSL_malloc(sk_ASN1_VALUE_num(sk)
 455                                                 * sizeof(*derlst));
 456                         tmpdat = OPENSSL_malloc(skcontlen);
 457                         if (!derlst || !tmpdat)
 458                                 return 0;
 459                         }
 460                 }
 461         /* If not sorting just output each item */
 462         if (!do_sort)
 463                 {
 464                 for (i = 0; i < sk_ASN1_VALUE_num(sk); i++)
 465                         {
 466                         skitem = sk_ASN1_VALUE_value(sk, i);
 467                         ASN1_item_ex_i2d(&skitem, out, item, -1, iclass);
 468                         }
 469                 return 1;
 470                 }
 471         p = tmpdat;
 472
 473         /* Doing sort: build up a list of each member's DER encoding */
 474         for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++)
 475                 {
 476                 skitem = sk_ASN1_VALUE_value(sk, i);
 477                 tder->data = p;
 478                 tder->length = ASN1_item_ex_i2d(&skitem, &p, item, -1, iclass);
 479                 tder->field = skitem;
 480                 }
 481
 482         /* Now sort them */
 483         qsort(derlst, sk_ASN1_VALUE_num(sk), sizeof(*derlst), der_cmp);
 484         /* Output sorted DER encoding */
 485         p = *out;
 486         for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++)
 487                 {
 488                 memcpy(p, tder->data, tder->length);
 489                 p += tder->length;
 490                 }
 491         *out = p;
 492         /* If do_sort is 2 then reorder the STACK */
 493         if (do_sort == 2)
 494                 {
 495                 for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk);
 496                                                         i++, tder++)
 497                         (void)sk_ASN1_VALUE_set(sk, i, tder->field);
 498                 }
 499         OPENSSL_free(derlst);
 500         OPENSSL_free(tmpdat);
 501         return 1;
 502         }
 503
 504 static int asn1_i2d_ex_primitive(ASN1_VALUE **pval, unsigned char **out,
 505                                 const ASN1_ITEM *it, int tag, int aclass)
 506         {
 507         int len;
 508         int utype;
 509         int usetag;
 510         int ndef = 0;
 511
 512         utype = it->utype;
 513
 514         /* Get length of content octets and maybe find
 515          * out the underlying type.
 516          */
 517
 518         len = asn1_ex_i2c(pval, NULL, &utype, it);
 519
 520         /* If SEQUENCE, SET or OTHER then header is
 521          * included in pseudo content octets so don't
 522          * include tag+length. We need to check here
 523          * because the call to asn1_ex_i2c() could change
 524          * utype.
 525          */
 526         if ((utype == V_ASN1_SEQUENCE) || (utype == V_ASN1_SET) ||
 527            (utype == V_ASN1_OTHER))
 528                 usetag = 0;
 529         else usetag = 1;
 530
 531         /* -1 means omit type */
 532
 533         if (len == -1)
 534                 return 0;
 535
 536         /* -2 return is special meaning use ndef */
 537         if (len == -2)
 538                 {
 539                 ndef = 2;
 540                 len = 0;
 541                 }
 542
 543         /* If not implicitly tagged get tag from underlying type */
 544         if (tag == -1) tag = utype;
 545
 546         /* Output tag+length followed by content octets */
 547         if (out)
 548                 {
 549                 if (usetag)
 550                         ASN1_put_object(out, ndef, len, tag, aclass);
 551                 asn1_ex_i2c(pval, *out, &utype, it);
 552                 if (ndef)
 553                         ASN1_put_eoc(out);
 554                 else
 555                         *out += len;
 556                 }
 557
 558         if (usetag)
 559                 return ASN1_object_size(ndef, len, tag);
 560         return len;
 561         }
 562
 563 /* Produce content octets from a structure */
 564
 565 int asn1_ex_i2c(ASN1_VALUE **pval, unsigned char *cout, int *putype,
 566                                 const ASN1_ITEM *it)
 567         {
 568         ASN1_BOOLEAN *tbool = NULL;
 569         ASN1_STRING *strtmp;
 570         ASN1_OBJECT *otmp;
 571         int utype;
 572         unsigned char *cont, c;
 573         int len;
 574         const ASN1_PRIMITIVE_FUNCS *pf;
 575         pf = it->funcs;
 576         if (pf && pf->prim_i2c)
 577                 return pf->prim_i2c(pval, cout, putype, it);
 578
 579         /* Should type be omitted? */
 580         if ((it->itype != ASN1_ITYPE_PRIMITIVE)
 581                 || (it->utype != V_ASN1_BOOLEAN))
 582                 {
 583                 if (!*pval) return -1;
 584                 }
 585
 586         if (it->itype == ASN1_ITYPE_MSTRING)
 587                 {
 588                 /* If MSTRING type set the underlying type */
 589                 strtmp = (ASN1_STRING *)*pval;
 590                 utype = strtmp->type;
 591                 *putype = utype;
 592                 }
 593         else if (it->utype == V_ASN1_ANY)
 594                 {
 595                 /* If ANY set type and pointer to value */
 596                 ASN1_TYPE *typ;
 597                 typ = (ASN1_TYPE *)*pval;
 598                 utype = typ->type;
 599                 *putype = utype;
 600                 pval = &typ->value.asn1_value;
 601                 }
 602         else utype = *putype;
 603
 604         switch(utype)
 605                 {
 606                 case V_ASN1_OBJECT:
 607                 otmp = (ASN1_OBJECT *)*pval;
 608                 cont = otmp->data;
 609                 len = otmp->length;
 610                 break;
 611
 612                 case V_ASN1_NULL:
 613                 cont = NULL;
 614                 len = 0;
 615                 break;
 616
 617                 case V_ASN1_BOOLEAN:
 618                 tbool = (ASN1_BOOLEAN *)pval;
 619                 if (*tbool == -1)
 620                         return -1;
 621                 if (it->utype != V_ASN1_ANY)
 622                         {
 623                         /* Default handling if value == size field then omit */
 624                         if (*tbool && (it->size > 0))
 625                                 return -1;
 626                         if (!*tbool && !it->size)
 627                                 return -1;
 628                         }
 629                 c = (unsigned char)*tbool;
 630                 cont = &c;
 631                 len = 1;
 632                 break;
 633
 634                 case V_ASN1_BIT_STRING:
 635                 return i2c_ASN1_BIT_STRING((ASN1_BIT_STRING *)*pval,
 636                                                         cout ? &cout : NULL);
 637                 break;
 638
 639                 case V_ASN1_INTEGER:
 640                 case V_ASN1_NEG_INTEGER:
 641                 case V_ASN1_ENUMERATED:
 642                 case V_ASN1_NEG_ENUMERATED:
 643                 /* These are all have the same content format
 644                  * as ASN1_INTEGER
 645                  */
 646                 return i2c_ASN1_INTEGER((ASN1_INTEGER *)*pval,
 647                                                         cout ? &cout : NULL);
 648                 break;
 649
 650                 case V_ASN1_OCTET_STRING:
 651                 case V_ASN1_NUMERICSTRING:
 652                 case V_ASN1_PRINTABLESTRING:
 653                 case V_ASN1_T61STRING:
 654                 case V_ASN1_VIDEOTEXSTRING:
 655                 case V_ASN1_IA5STRING:
 656                 case V_ASN1_UTCTIME:
 657                 case V_ASN1_GENERALIZEDTIME:
 658                 case V_ASN1_GRAPHICSTRING:
 659                 case V_ASN1_VISIBLESTRING:
 660                 case V_ASN1_GENERALSTRING:
 661                 case V_ASN1_UNIVERSALSTRING:
 662                 case V_ASN1_BMPSTRING:
 663                 case V_ASN1_UTF8STRING:
 664                 case V_ASN1_SEQUENCE:
 665                 case V_ASN1_SET:
 666                 default:
 667                 /* All based on ASN1_STRING and handled the same */
 668                 strtmp = (ASN1_STRING *)*pval;
 669                 /* Special handling for NDEF */
 670                 if ((it->size == ASN1_TFLG_NDEF)
 671                         && (strtmp->flags & ASN1_STRING_FLAG_NDEF))
 672                         {
 673                         if (cout)
 674                                 {
 675                                 strtmp->data = cout;
 676                                 strtmp->length = 0;
 677                                 }
 678                         /* Special return code */
 679                         return -2;
 680                         }
 681                 cont = strtmp->data;
 682                 len = strtmp->length;
 683
 684                 break;
 685
 686                 }
 687         if (cout && len)
 688                 memcpy(cout, cont, len);
 689         return len;
 690         }