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) 2000-2002 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, const ASN1_ITEM *it)
  83 {
  84         return asn1_item_flags_i2d(val, out, it, ASN1_TFLG_NDEF);
  85 }
  86
  87 int ASN1_item_i2d(ASN1_VALUE *val, unsigned char **out, const ASN1_ITEM *it)
  88 {
  89         return asn1_item_flags_i2d(val, out, it, 0);
  90 }
  91
  92 /* Encode an ASN1 item, this is use by the
  93  * standard 'i2d' function. 'out' points to
  94  * a buffer to output the data to.
  95  *
  96  * The new i2d has one additional feature. If the output
  97  * buffer is NULL (i.e. *out == NULL) then a buffer is
  98  * allocated and populated with the encoding.
  99  */
 100
 101 static int asn1_item_flags_i2d(ASN1_VALUE *val, unsigned char **out, const ASN1_ITEM *it, int flags)
 102 {
 103         if(out && !*out) {
 104                 unsigned char *p, *buf;
 105                 int len;
 106                 len = ASN1_item_ex_i2d(&val, NULL, it, -1, flags);
 107                 if(len <= 0) return len;
 108                 buf = OPENSSL_malloc(len);
 109                 if(!buf) return -1;
 110                 p = buf;
 111                 ASN1_item_ex_i2d(&val, &p, it, -1, flags);
 112                 *out = buf;
 113                 return len;
 114         }
 115
 116         return ASN1_item_ex_i2d(&val, out, it, -1, flags);
 117 }
 118
 119 /* Encode an item, taking care of IMPLICIT tagging (if any).
 120  * This function performs the normal item handling: it can be
 121  * used in external types.
 122  */
 123
 124 int ASN1_item_ex_i2d(ASN1_VALUE **pval, unsigned char **out,
 125                         const ASN1_ITEM *it, int tag, int aclass)
 126 {
 127         const ASN1_TEMPLATE *tt = NULL;
 128         unsigned char *p = NULL;
 129         int i, seqcontlen, seqlen, ndef = 1;
 130         const ASN1_COMPAT_FUNCS *cf;
 131         const ASN1_EXTERN_FUNCS *ef;
 132         const ASN1_AUX *aux = it->funcs;
 133         ASN1_aux_cb *asn1_cb = 0;
 134
 135         if((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval)
 136                 return 0;
 137
 138         if(aux && aux->asn1_cb)
 139                  asn1_cb = aux->asn1_cb;
 140
 141         switch(it->itype) {
 142
 143                 case ASN1_ITYPE_PRIMITIVE:
 144                 if(it->templates)
 145                         return asn1_template_ex_i2d(pval, out, it->templates,
 146                                                                 tag, aclass);
 147                 return asn1_i2d_ex_primitive(pval, out, it, tag, aclass);
 148                 break;
 149
 150                 case ASN1_ITYPE_MSTRING:
 151                 return asn1_i2d_ex_primitive(pval, out, it, -1, aclass);
 152
 153                 case ASN1_ITYPE_CHOICE:
 154                 if(asn1_cb && !asn1_cb(ASN1_OP_I2D_PRE, pval, it))
 155                                 return 0;
 156                 i = asn1_get_choice_selector(pval, it);
 157                 if((i >= 0) && (i < it->tcount)) {
 158                         ASN1_VALUE **pchval;
 159                         const ASN1_TEMPLATE *chtt;
 160                         chtt = it->templates + i;
 161                         pchval = asn1_get_field_ptr(pval, chtt);
 162                         return asn1_template_ex_i2d(pchval, out, chtt,
 163                                                                 -1, aclass);
 164                 }
 165                 /* Fixme: error condition if selector out of range */
 166                 if(asn1_cb && !asn1_cb(ASN1_OP_I2D_POST, pval, it))
 167                                 return 0;
 168                 break;
 169
 170                 case ASN1_ITYPE_EXTERN:
 171                 /* If new style i2d it does all the work */
 172                 ef = it->funcs;
 173                 return ef->asn1_ex_i2d(pval, out, it, tag, aclass);
 174
 175                 case ASN1_ITYPE_COMPAT:
 176                 /* old style hackery... */
 177                 cf = it->funcs;
 178                 if(out) p = *out;
 179                 i = cf->asn1_i2d(*pval, out);
 180                 /* Fixup for IMPLICIT tag: note this messes up for tags > 30,
 181                  * but so did the old code. Tags > 30 are very rare anyway.
 182                  */
 183                 if(out && (tag != -1))
 184                         *p = aclass | tag | (*p & V_ASN1_CONSTRUCTED);
 185                 return i;
 186
 187                 case ASN1_ITYPE_NDEF_SEQUENCE:
 188 #if 0
 189 fprintf(stderr, "NDEF sequence from %s flags %d\n", it->sname, aclass & ASN1_TFLG_NDEF);
 190 #endif
 191                 /* Use indefinite length constructed if requested */
 192                 if (aclass & ASN1_TFLG_NDEF) ndef = 2;
 193                 /* fall through */
 194
 195                 case ASN1_ITYPE_SEQUENCE:
 196                 i = asn1_enc_restore(&seqcontlen, out, pval, it);
 197                 /* An error occurred */
 198                 if(i < 0) return 0;
 199                 /* We have a valid cached encoding... */
 200                 if(i > 0) return seqcontlen;
 201                 /* Otherwise carry on */
 202                 seqcontlen = 0;
 203                 /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
 204                 if(tag == -1) {
 205                         tag = V_ASN1_SEQUENCE;
 206                         /* Retain any other flags in aclass */
 207                         aclass = (aclass & ~ASN1_TFLG_TAG_CLASS)
 208                                         | V_ASN1_UNIVERSAL;
 209                 }
 210                 if(asn1_cb && !asn1_cb(ASN1_OP_I2D_PRE, pval, it))
 211                                 return 0;
 212                 /* First work out sequence content length */
 213                 for(i = 0, tt = it->templates; i < it->tcount; tt++, i++) {
 214                         const ASN1_TEMPLATE *seqtt;
 215                         ASN1_VALUE **pseqval;
 216                         seqtt = asn1_do_adb(pval, tt, 1);
 217                         if(!seqtt) return 0;
 218                         pseqval = asn1_get_field_ptr(pval, seqtt);
 219                         /* FIXME: check for errors in enhanced version */
 220                         seqcontlen += asn1_template_ex_i2d(pseqval, NULL, seqtt,
 221                                                                 -1, aclass);
 222                 }
 223                 seqlen = ASN1_object_size(ndef, seqcontlen, tag);
 224                 if(!out) return seqlen;
 225                 /* Output SEQUENCE header */
 226                 ASN1_put_object(out, ndef, seqcontlen, tag, aclass);
 227                 for(i = 0, tt = it->templates; i < it->tcount; tt++, i++) {
 228                         const ASN1_TEMPLATE *seqtt;
 229                         ASN1_VALUE **pseqval;
 230                         seqtt = asn1_do_adb(pval, tt, 1);
 231                         if(!seqtt) return 0;
 232                         pseqval = asn1_get_field_ptr(pval, seqtt);
 233                         /* FIXME: check for errors in enhanced version */
 234                         asn1_template_ex_i2d(pseqval, out, seqtt, -1, aclass);
 235                 }
 236                 if (ndef == 2) ASN1_put_eoc(out);
 237                 if(asn1_cb  && !asn1_cb(ASN1_OP_I2D_POST, pval, it))
 238                                 return 0;
 239                 return seqlen;
 240
 241                 default:
 242                 return 0;
 243         }
 244         return 0;
 245 }
 246
 247 static int asn1_template_ex_i2d(ASN1_VALUE **pval, unsigned char **out, const ASN1_TEMPLATE *tt, int tag, int iclass)
 248 {
 249         int i, ret, flags, ttag, tclass, ndef;
 250         flags = tt->flags;
 251         /* Work out tag and class to use: tagging may come
 252          * either from the template or the arguments, not both
 253          * because this would create ambiguity. Additionally
 254          * the iclass argument may contain some additional flags
 255          * which should be noted and passed down to other levels.
 256          */
 257         if (flags & ASN1_TFLG_TAG_MASK)
 258                 {
 259                 /* Error if argument and template tagging */
 260                 if (tag != -1)
 261                         /* FIXME: error code here */
 262                         return -1;
 263                 /* Get tagging from template */
 264                 ttag = tt->tag;
 265                 tclass = flags & ASN1_TFLG_TAG_CLASS;
 266                 }
 267         else if (tag != -1)
 268                 {
 269                 /* No template tagging, get from arguments */
 270                 ttag = tag;
 271                 tclass = iclass & ASN1_TFLG_TAG_CLASS;
 272                 }
 273         else
 274                 {
 275                 ttag = -1;
 276                 tclass = 0;
 277                 }
 278         /*
 279          * Remove any class mask from iflag.
 280          */
 281         iclass &= ~ASN1_TFLG_TAG_CLASS;
 282
 283         /* At this point 'ttag' contains the outer tag to use,
 284          * 'tclass' is the class and iclass is any flags passed
 285          * to this function.
 286          */
 287
 288         /* if template and arguments require ndef, use it */
 289         if ((flags & ASN1_TFLG_NDEF) && (iclass & ASN1_TFLG_NDEF))
 290                 ndef = 2;
 291         else ndef = 1;
 292
 293         if(flags & ASN1_TFLG_SK_MASK) {
 294                 /* SET OF, SEQUENCE OF */
 295                 STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
 296                 int isset, sktag, skaclass;
 297                 int skcontlen, sklen;
 298                 ASN1_VALUE *skitem;
 299
 300                 if(!*pval) return 0;
 301
 302                 if(flags & ASN1_TFLG_SET_OF) {
 303                         isset = 1;
 304                         /* 2 means we reorder */
 305                         if(flags & ASN1_TFLG_SEQUENCE_OF) isset = 2;
 306                 } else isset = 0;
 307
 308                 /* Work out inner tag value: if EXPLICIT
 309                  * or no tagging use underlying type.
 310                  */
 311                 if((ttag != -1) && !(flags & ASN1_TFLG_EXPTAG)) {
 312                         sktag = ttag;
 313                         skaclass = tclass;
 314                 } else {
 315                         skaclass = V_ASN1_UNIVERSAL;
 316                         if(isset) sktag = V_ASN1_SET;
 317                         else sktag = V_ASN1_SEQUENCE;
 318                 }
 319
 320                 /* Determine total length of items */
 321                 skcontlen = 0;
 322                 for(i = 0; i < sk_ASN1_VALUE_num(sk); i++) {
 323                         skitem = sk_ASN1_VALUE_value(sk, i);
 324                         skcontlen += ASN1_item_ex_i2d(&skitem, NULL,
 325                                                         ASN1_ITEM_ptr(tt->item),
 326                                                         -1, iclass);
 327                 }
 328                 sklen = ASN1_object_size(ndef, skcontlen, sktag);
 329                 /* If EXPLICIT need length of surrounding tag */
 330                 if(flags & ASN1_TFLG_EXPTAG)
 331                         ret = ASN1_object_size(ndef, sklen, ttag);
 332                 else ret = sklen;
 333
 334                 if(!out) return ret;
 335
 336                 /* Now encode this lot... */
 337                 /* EXPLICIT tag */
 338                 if(flags & ASN1_TFLG_EXPTAG)
 339                         ASN1_put_object(out, ndef, sklen, ttag, tclass);
 340                 /* SET or SEQUENCE and IMPLICIT tag */
 341                 ASN1_put_object(out, ndef, skcontlen, sktag, skaclass);
 342                 /* And the stuff itself */
 343                 asn1_set_seq_out(sk, out, skcontlen, ASN1_ITEM_ptr(tt->item),
 344                                                                 isset, iclass);
 345                 if (ndef == 2) {
 346                         ASN1_put_eoc(out);
 347                         if(flags & ASN1_TFLG_EXPTAG)
 348                                 ASN1_put_eoc(out);
 349                 }
 350
 351                 return ret;
 352         }
 353
 354         if(flags & ASN1_TFLG_EXPTAG) {
 355                 /* EXPLICIT tagging */
 356                 /* Find length of tagged item */
 357                 i = ASN1_item_ex_i2d(pval, NULL, ASN1_ITEM_ptr(tt->item),
 358                                                                 -1, iclass);
 359                 if(!i) return 0;
 360                 /* Find length of EXPLICIT tag */
 361                 ret = ASN1_object_size(ndef, i, ttag);
 362                 if(out) {
 363                         /* Output tag and item */
 364                         ASN1_put_object(out, ndef, i, ttag, tclass);
 365                         ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item),
 366                                                                 -1, iclass);
 367                         if (ndef == 2) ASN1_put_eoc(out);
 368                 }
 369                 return ret;
 370         }
 371
 372         /* Either normal or IMPLICIT tagging: combine class and flags */
 373         return ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item),
 374                                                 ttag, tclass | iclass);
 375
 376 }
 377
 378 /* Temporary structure used to hold DER encoding of items for SET OF */
 379
 380 typedef struct {
 381         unsigned char *data;
 382         int length;
 383         ASN1_VALUE *field;
 384 } DER_ENC;
 385
 386 static int der_cmp(const void *a, const void *b)
 387 {
 388         const DER_ENC *d1 = a, *d2 = b;
 389         int cmplen, i;
 390         cmplen = (d1->length < d2->length) ? d1->length : d2->length;
 391         i = memcmp(d1->data, d2->data, cmplen);
 392         if(i) return i;
 393         return d1->length - d2->length;
 394 }
 395
 396 /* Output the content octets of SET OF or SEQUENCE OF */
 397
 398 static int asn1_set_seq_out(STACK_OF(ASN1_VALUE) *sk, unsigned char **out,
 399                                         int skcontlen, const ASN1_ITEM *item,
 400                                         int do_sort, int iclass)
 401 {
 402         int i;
 403         ASN1_VALUE *skitem;
 404         unsigned char *tmpdat = NULL, *p = NULL;
 405         DER_ENC *derlst = NULL, *tder;
 406         if(do_sort) {
 407                 /* Don't need to sort less than 2 items */
 408                 if(sk_ASN1_VALUE_num(sk) < 2) do_sort = 0;
 409                 else {
 410                         derlst = OPENSSL_malloc(sk_ASN1_VALUE_num(sk) * sizeof(*derlst));
 411                         tmpdat = OPENSSL_malloc(skcontlen);
 412                         if(!derlst || !tmpdat) return 0;
 413                 }
 414         }
 415         /* If not sorting just output each item */
 416         if(!do_sort) {
 417                 for(i = 0; i < sk_ASN1_VALUE_num(sk); i++) {
 418                         skitem = sk_ASN1_VALUE_value(sk, i);
 419                         ASN1_item_ex_i2d(&skitem, out, item, -1, iclass);
 420                 }
 421                 return 1;
 422         }
 423         p = tmpdat;
 424         /* Doing sort: build up a list of each member's DER encoding */
 425         for(i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++) {
 426                 skitem = sk_ASN1_VALUE_value(sk, i);
 427                 tder->data = p;
 428                 tder->length = ASN1_item_ex_i2d(&skitem, &p, item, -1, iclass);
 429                 tder->field = skitem;
 430         }
 431         /* Now sort them */
 432         qsort(derlst, sk_ASN1_VALUE_num(sk), sizeof(*derlst), der_cmp);
 433         /* Output sorted DER encoding */
 434         p = *out;
 435         for(i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++) {
 436                 memcpy(p, tder->data, tder->length);
 437                 p += tder->length;
 438         }
 439         *out = p;
 440         /* If do_sort is 2 then reorder the STACK */
 441         if(do_sort == 2) {
 442                 for(i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++)
 443                         sk_ASN1_VALUE_set(sk, i, tder->field);
 444         }
 445         OPENSSL_free(derlst);
 446         OPENSSL_free(tmpdat);
 447         return 1;
 448 }
 449
 450 static int asn1_i2d_ex_primitive(ASN1_VALUE **pval, unsigned char **out, const ASN1_ITEM *it, int tag, int aclass)
 451 {
 452         int len;
 453         int utype;
 454         int usetag;
 455         int ndef = 0;
 456
 457         utype = it->utype;
 458
 459         /* Get length of content octets and maybe find
 460          * out the underlying type.
 461          */
 462
 463         len = asn1_ex_i2c(pval, NULL, &utype, it);
 464
 465         /* If SEQUENCE, SET or OTHER then header is
 466          * included in pseudo content octets so don't
 467          * include tag+length. We need to check here
 468          * because the call to asn1_ex_i2c() could change
 469          * utype.
 470          */
 471         if((utype == V_ASN1_SEQUENCE) || (utype == V_ASN1_SET) ||
 472            (utype == V_ASN1_OTHER))
 473                 usetag = 0;
 474         else usetag = 1;
 475
 476         /* -1 means omit type */
 477
 478         if(len == -1)
 479                 return 0;
 480
 481         /* -2 return is special meaning use ndef */
 482         if (len == -2)
 483                 {
 484                 ndef = 2;
 485                 len = 0;
 486                 }
 487
 488         /* If not implicitly tagged get tag from underlying type */
 489         if(tag == -1) tag = utype;
 490
 491         /* Output tag+length followed by content octets */
 492         if(out) {
 493                 if(usetag) ASN1_put_object(out, ndef, len, tag, aclass);
 494                 asn1_ex_i2c(pval, *out, &utype, it);
 495                 *out += len;
 496         }
 497
 498         if(usetag) return ASN1_object_size(ndef, len, tag);
 499         return len;
 500 }
 501
 502 /* Produce content octets from a structure */
 503
 504 int asn1_ex_i2c(ASN1_VALUE **pval, unsigned char *cout, int *putype, const ASN1_ITEM *it)
 505 {
 506         ASN1_BOOLEAN *tbool = NULL;
 507         ASN1_STRING *strtmp;
 508         ASN1_OBJECT *otmp;
 509         int utype;
 510         unsigned char *cont, c;
 511         int len;
 512         const ASN1_PRIMITIVE_FUNCS *pf;
 513         pf = it->funcs;
 514         if(pf && pf->prim_i2c) return pf->prim_i2c(pval, cout, putype, it);
 515
 516         /* Should type be omitted? */
 517         if((it->itype != ASN1_ITYPE_PRIMITIVE) || (it->utype != V_ASN1_BOOLEAN)) {
 518                 if(!*pval) return -1;
 519         }
 520
 521         if(it->itype == ASN1_ITYPE_MSTRING) {
 522                 /* If MSTRING type set the underlying type */
 523                 strtmp = (ASN1_STRING *)*pval;
 524                 utype = strtmp->type;
 525                 *putype = utype;
 526         } else if(it->utype == V_ASN1_ANY) {
 527                 /* If ANY set type and pointer to value */
 528                 ASN1_TYPE *typ;
 529                 typ = (ASN1_TYPE *)*pval;
 530                 utype = typ->type;
 531                 *putype = utype;
 532                 pval = (ASN1_VALUE **)&typ->value.ptr;
 533         } else utype = *putype;
 534
 535         switch(utype) {
 536                 case V_ASN1_OBJECT:
 537                 otmp = (ASN1_OBJECT *)*pval;
 538                 cont = otmp->data;
 539                 len = otmp->length;
 540                 break;
 541
 542                 case V_ASN1_NULL:
 543                 cont = NULL;
 544                 len = 0;
 545                 break;
 546
 547                 case V_ASN1_BOOLEAN:
 548                 tbool = (ASN1_BOOLEAN *)pval;
 549                 if(*tbool == -1) return -1;
 550                 /* Default handling if value == size field then omit */
 551                 if(*tbool && (it->size > 0)) return -1;
 552                 if(!*tbool && !it->size) return -1;
 553                 c = (unsigned char)*tbool;
 554                 cont = &c;
 555                 len = 1;
 556                 break;
 557
 558                 case V_ASN1_BIT_STRING:
 559                 return i2c_ASN1_BIT_STRING((ASN1_BIT_STRING *)*pval, cout ? &cout : NULL);
 560                 break;
 561
 562                 case V_ASN1_INTEGER:
 563                 case V_ASN1_NEG_INTEGER:
 564                 case V_ASN1_ENUMERATED:
 565                 case V_ASN1_NEG_ENUMERATED:
 566                 /* These are all have the same content format
 567                  * as ASN1_INTEGER
 568                  */
 569                 return i2c_ASN1_INTEGER((ASN1_INTEGER *)*pval, cout ? &cout : NULL);
 570                 break;
 571
 572                 case V_ASN1_OCTET_STRING:
 573                 case V_ASN1_NUMERICSTRING:
 574                 case V_ASN1_PRINTABLESTRING:
 575                 case V_ASN1_T61STRING:
 576                 case V_ASN1_VIDEOTEXSTRING:
 577                 case V_ASN1_IA5STRING:
 578                 case V_ASN1_UTCTIME:
 579                 case V_ASN1_GENERALIZEDTIME:
 580                 case V_ASN1_GRAPHICSTRING:
 581                 case V_ASN1_VISIBLESTRING:
 582                 case V_ASN1_GENERALSTRING:
 583                 case V_ASN1_UNIVERSALSTRING:
 584                 case V_ASN1_BMPSTRING:
 585                 case V_ASN1_UTF8STRING:
 586                 case V_ASN1_SEQUENCE:
 587                 case V_ASN1_SET:
 588                 default:
 589                 /* All based on ASN1_STRING and handled the same */
 590                 strtmp = (ASN1_STRING *)*pval;
 591                 /* Special handling for NDEF */
 592                 if ((it->size == ASN1_TFLG_NDEF)
 593                         && (strtmp->flags & ASN1_STRING_FLAG_NDEF))
 594                         {
 595                         if (cout)
 596                                 {
 597                                 strtmp->data = cout;
 598                                 strtmp->length = 0;
 599                                 ASN1_put_eoc(&cout);
 600                                 }
 601                         /* Special return code */
 602                         return -2;
 603                         }
 604                 cont = strtmp->data;
 605                 len = strtmp->length;
 606
 607                 break;
 608
 609         }
 610         if(cout && len) memcpy(cout, cont, len);
 611         return len;
 612 }