crypto/asn1/tasn_enc.c

   1 /* tasn_enc.c */
   2 /*
   3  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
   4  * 2000.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 2000-2004 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59
  60 #include <stddef.h>
  61 #include <string.h>
  62 #include "internal/cryptlib.h"
  63 #include <openssl/asn1.h>
  64 #include <openssl/asn1t.h>
  65 #include <openssl/objects.h>
  66 #include "internal/asn1_int.h"
  67 #include "asn1_locl.h"
  68
  69 static int asn1_i2d_ex_primitive(ASN1_VALUE **pval, unsigned char **out,
  70                                  const ASN1_ITEM *it, int tag, int aclass);
  71 static int asn1_set_seq_out(STACK_OF(ASN1_VALUE) *sk, unsigned char **out,
  72                             int skcontlen, const ASN1_ITEM *item,
  73                             int do_sort, int iclass);
  74 static int asn1_template_ex_i2d(ASN1_VALUE **pval, unsigned char **out,
  75                                 const ASN1_TEMPLATE *tt, 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 static int asn1_ex_i2c(ASN1_VALUE **pval, unsigned char *cout, int *putype,
  79                        const ASN1_ITEM *it);
  80
  81 /*
  82  * Top level i2d equivalents: the 'ndef' variant instructs the encoder to use
  83  * indefinite length constructed encoding, where appropriate
  84  */
  85
  86 int ASN1_item_ndef_i2d(ASN1_VALUE *val, unsigned char **out,
  87                        const ASN1_ITEM *it)
  88 {
  89     return asn1_item_flags_i2d(val, out, it, ASN1_TFLG_NDEF);
  90 }
  91
  92 int ASN1_item_i2d(ASN1_VALUE *val, unsigned char **out, const ASN1_ITEM *it)
  93 {
  94     return asn1_item_flags_i2d(val, out, it, 0);
  95 }
  96
  97 /*
  98  * Encode an ASN1 item, this is use by the standard 'i2d' function. 'out'
  99  * points to a buffer to output the data to. The new i2d has one additional
 100  * feature. If the output buffer is NULL (i.e. *out == NULL) then a buffer is
 101  * allocated and populated with the encoding.
 102  */
 103
 104 static int asn1_item_flags_i2d(ASN1_VALUE *val, unsigned char **out,
 105                                const ASN1_ITEM *it, int flags)
 106 {
 107     if (out && !*out) {
 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 /*
 126  * Encode an item, taking care of IMPLICIT tagging (if any). This function
 127  * performs the normal item handling: it can be 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     int i, seqcontlen, seqlen, ndef = 1;
 135     const ASN1_EXTERN_FUNCS *ef;
 136     const ASN1_AUX *aux = it->funcs;
 137     ASN1_aux_cb *asn1_cb = 0;
 138
 139     if ((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval)
 140         return 0;
 141
 142     if (aux && aux->asn1_cb)
 143         asn1_cb = aux->asn1_cb;
 144
 145     switch (it->itype) {
 146
 147     case ASN1_ITYPE_PRIMITIVE:
 148         if (it->templates)
 149             return asn1_template_ex_i2d(pval, out, it->templates,
 150                                         tag, aclass);
 151         return asn1_i2d_ex_primitive(pval, out, it, tag, aclass);
 152
 153     case ASN1_ITYPE_MSTRING:
 154         return asn1_i2d_ex_primitive(pval, out, it, -1, aclass);
 155
 156     case ASN1_ITYPE_CHOICE:
 157         if (asn1_cb && !asn1_cb(ASN1_OP_I2D_PRE, pval, it, NULL))
 158             return 0;
 159         i = asn1_get_choice_selector(pval, it);
 160         if ((i >= 0) && (i < it->tcount)) {
 161             ASN1_VALUE **pchval;
 162             const ASN1_TEMPLATE *chtt;
 163             chtt = it->templates + i;
 164             pchval = asn1_get_field_ptr(pval, chtt);
 165             return asn1_template_ex_i2d(pchval, out, chtt, -1, aclass);
 166         }
 167         /* Fixme: error condition if selector out of range */
 168         if (asn1_cb && !asn1_cb(ASN1_OP_I2D_POST, pval, it, NULL))
 169             return 0;
 170         break;
 171
 172     case ASN1_ITYPE_EXTERN:
 173         /* If new style i2d it does all the work */
 174         ef = it->funcs;
 175         return ef->asn1_ex_i2d(pval, out, it, tag, aclass);
 176
 177     case ASN1_ITYPE_NDEF_SEQUENCE:
 178         /* Use indefinite length constructed if requested */
 179         if (aclass & ASN1_TFLG_NDEF)
 180             ndef = 2;
 181         /* fall through */
 182
 183     case ASN1_ITYPE_SEQUENCE:
 184         i = asn1_enc_restore(&seqcontlen, out, pval, it);
 185         /* An error occurred */
 186         if (i < 0)
 187             return 0;
 188         /* We have a valid cached encoding... */
 189         if (i > 0)
 190             return seqcontlen;
 191         /* Otherwise carry on */
 192         seqcontlen = 0;
 193         /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
 194         if (tag == -1) {
 195             tag = V_ASN1_SEQUENCE;
 196             /* Retain any other flags in aclass */
 197             aclass = (aclass & ~ASN1_TFLG_TAG_CLASS)
 198                 | V_ASN1_UNIVERSAL;
 199         }
 200         if (asn1_cb && !asn1_cb(ASN1_OP_I2D_PRE, pval, it, NULL))
 201             return 0;
 202         /* First work out sequence content length */
 203         for (i = 0, tt = it->templates; i < it->tcount; tt++, i++) {
 204             const ASN1_TEMPLATE *seqtt;
 205             ASN1_VALUE **pseqval;
 206             seqtt = asn1_do_adb(pval, tt, 1);
 207             if (!seqtt)
 208                 return 0;
 209             pseqval = asn1_get_field_ptr(pval, seqtt);
 210             /* FIXME: check for errors in enhanced version */
 211             seqcontlen += asn1_template_ex_i2d(pseqval, NULL, seqtt,
 212                                                -1, aclass);
 213         }
 214
 215         seqlen = ASN1_object_size(ndef, seqcontlen, tag);
 216         if (!out)
 217             return seqlen;
 218         /* Output SEQUENCE header */
 219         ASN1_put_object(out, ndef, seqcontlen, tag, aclass);
 220         for (i = 0, tt = it->templates; i < it->tcount; tt++, i++) {
 221             const ASN1_TEMPLATE *seqtt;
 222             ASN1_VALUE **pseqval;
 223             seqtt = asn1_do_adb(pval, tt, 1);
 224             if (!seqtt)
 225                 return 0;
 226             pseqval = asn1_get_field_ptr(pval, seqtt);
 227             /* FIXME: check for errors in enhanced version */
 228             asn1_template_ex_i2d(pseqval, out, seqtt, -1, aclass);
 229         }
 230         if (ndef == 2)
 231             ASN1_put_eoc(out);
 232         if (asn1_cb && !asn1_cb(ASN1_OP_I2D_POST, pval, it, NULL))
 233             return 0;
 234         return seqlen;
 235
 236     default:
 237         return 0;
 238
 239     }
 240     return 0;
 241 }
 242
 243 static int asn1_template_ex_i2d(ASN1_VALUE **pval, unsigned char **out,
 244                                 const ASN1_TEMPLATE *tt, int tag, int iclass)
 245 {
 246     int i, ret, flags, ttag, tclass, ndef;
 247     flags = tt->flags;
 248     /*
 249      * Work out tag and class to use: tagging may come either from the
 250      * template or the arguments, not both because this would create
 251      * ambiguity. Additionally the iclass argument may contain some
 252      * additional flags which should be noted and passed down to other
 253      * levels.
 254      */
 255     if (flags & ASN1_TFLG_TAG_MASK) {
 256         /* Error if argument and template tagging */
 257         if (tag != -1)
 258             /* FIXME: error code here */
 259             return -1;
 260         /* Get tagging from template */
 261         ttag = tt->tag;
 262         tclass = flags & ASN1_TFLG_TAG_CLASS;
 263     } else if (tag != -1) {
 264         /* No template tagging, get from arguments */
 265         ttag = tag;
 266         tclass = iclass & ASN1_TFLG_TAG_CLASS;
 267     } else {
 268         ttag = -1;
 269         tclass = 0;
 270     }
 271     /*
 272      * Remove any class mask from iflag.
 273      */
 274     iclass &= ~ASN1_TFLG_TAG_CLASS;
 275
 276     /*
 277      * At this point 'ttag' contains the outer tag to use, 'tclass' is the
 278      * class and iclass is any flags passed to this function.
 279      */
 280
 281     /* if template and arguments require ndef, use it */
 282     if ((flags & ASN1_TFLG_NDEF) && (iclass & ASN1_TFLG_NDEF))
 283         ndef = 2;
 284     else
 285         ndef = 1;
 286
 287     if (flags & ASN1_TFLG_SK_MASK) {
 288         /* SET OF, SEQUENCE OF */
 289         STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
 290         int isset, sktag, skaclass;
 291         int skcontlen, sklen;
 292         ASN1_VALUE *skitem;
 293
 294         if (!*pval)
 295             return 0;
 296
 297         if (flags & ASN1_TFLG_SET_OF) {
 298             isset = 1;
 299             /* 2 means we reorder */
 300             if (flags & ASN1_TFLG_SEQUENCE_OF)
 301                 isset = 2;
 302         } else
 303             isset = 0;
 304
 305         /*
 306          * Work out inner tag value: if EXPLICIT or no tagging use underlying
 307          * type.
 308          */
 309         if ((ttag != -1) && !(flags & ASN1_TFLG_EXPTAG)) {
 310             sktag = ttag;
 311             skaclass = tclass;
 312         } else {
 313             skaclass = V_ASN1_UNIVERSAL;
 314             if (isset)
 315                 sktag = V_ASN1_SET;
 316             else
 317                 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
 333             ret = sklen;
 334
 335         if (!out)
 336             return ret;
 337
 338         /* Now encode this lot... */
 339         /* EXPLICIT tag */
 340         if (flags & ASN1_TFLG_EXPTAG)
 341             ASN1_put_object(out, ndef, sklen, ttag, tclass);
 342         /* SET or SEQUENCE and IMPLICIT tag */
 343         ASN1_put_object(out, ndef, skcontlen, sktag, skaclass);
 344         /* And the stuff itself */
 345         asn1_set_seq_out(sk, out, skcontlen, ASN1_ITEM_ptr(tt->item),
 346                          isset, iclass);
 347         if (ndef == 2) {
 348             ASN1_put_eoc(out);
 349             if (flags & ASN1_TFLG_EXPTAG)
 350                 ASN1_put_eoc(out);
 351         }
 352
 353         return ret;
 354     }
 355
 356     if (flags & ASN1_TFLG_EXPTAG) {
 357         /* EXPLICIT tagging */
 358         /* Find length of tagged item */
 359         i = ASN1_item_ex_i2d(pval, NULL, ASN1_ITEM_ptr(tt->item), -1, iclass);
 360         if (!i)
 361             return 0;
 362         /* Find length of EXPLICIT tag */
 363         ret = ASN1_object_size(ndef, i, ttag);
 364         if (out) {
 365             /* Output tag and item */
 366             ASN1_put_object(out, ndef, i, ttag, tclass);
 367             ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item), -1, iclass);
 368             if (ndef == 2)
 369                 ASN1_put_eoc(out);
 370         }
 371         return ret;
 372     }
 373
 374     /* Either normal or IMPLICIT tagging: combine class and flags */
 375     return ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item),
 376                             ttag, tclass | iclass);
 377
 378 }
 379
 380 /* Temporary structure used to hold DER encoding of items for SET OF */
 381
 382 typedef struct {
 383     unsigned char *data;
 384     int length;
 385     ASN1_VALUE *field;
 386 } DER_ENC;
 387
 388 static int der_cmp(const void *a, const void *b)
 389 {
 390     const DER_ENC *d1 = a, *d2 = b;
 391     int cmplen, i;
 392     cmplen = (d1->length < d2->length) ? d1->length : d2->length;
 393     i = memcmp(d1->data, d2->data, cmplen);
 394     if (i)
 395         return i;
 396     return d1->length - d2->length;
 397 }
 398
 399 /* Output the content octets of SET OF or SEQUENCE OF */
 400
 401 static int asn1_set_seq_out(STACK_OF(ASN1_VALUE) *sk, unsigned char **out,
 402                             int skcontlen, const ASN1_ITEM *item,
 403                             int do_sort, int iclass)
 404 {
 405     int i;
 406     ASN1_VALUE *skitem;
 407     unsigned char *tmpdat = NULL, *p = NULL;
 408     DER_ENC *derlst = NULL, *tder;
 409     if (do_sort) {
 410         /* Don't need to sort less than 2 items */
 411         if (sk_ASN1_VALUE_num(sk) < 2)
 412             do_sort = 0;
 413         else {
 414             derlst = OPENSSL_malloc(sk_ASN1_VALUE_num(sk)
 415                                     * sizeof(*derlst));
 416             if (!derlst)
 417                 return 0;
 418             tmpdat = OPENSSL_malloc(skcontlen);
 419             if (!tmpdat) {
 420                 OPENSSL_free(derlst);
 421                 return 0;
 422             }
 423         }
 424     }
 425     /* If not sorting just output each item */
 426     if (!do_sort) {
 427         for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) {
 428             skitem = sk_ASN1_VALUE_value(sk, i);
 429             ASN1_item_ex_i2d(&skitem, out, item, -1, iclass);
 430         }
 431         return 1;
 432     }
 433     p = tmpdat;
 434
 435     /* Doing sort: build up a list of each member's DER encoding */
 436     for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++) {
 437         skitem = sk_ASN1_VALUE_value(sk, i);
 438         tder->data = p;
 439         tder->length = ASN1_item_ex_i2d(&skitem, &p, item, -1, iclass);
 440         tder->field = skitem;
 441     }
 442
 443     /* Now sort them */
 444     qsort(derlst, sk_ASN1_VALUE_num(sk), sizeof(*derlst), der_cmp);
 445     /* Output sorted DER encoding */
 446     p = *out;
 447     for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++) {
 448         memcpy(p, tder->data, tder->length);
 449         p += tder->length;
 450     }
 451     *out = p;
 452     /* If do_sort is 2 then reorder the STACK */
 453     if (do_sort == 2) {
 454         for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++)
 455             (void)sk_ASN1_VALUE_set(sk, i, tder->field);
 456     }
 457     OPENSSL_free(derlst);
 458     OPENSSL_free(tmpdat);
 459     return 1;
 460 }
 461
 462 static int asn1_i2d_ex_primitive(ASN1_VALUE **pval, unsigned char **out,
 463                                  const ASN1_ITEM *it, int tag, int aclass)
 464 {
 465     int len;
 466     int utype;
 467     int usetag;
 468     int ndef = 0;
 469
 470     utype = it->utype;
 471
 472     /*
 473      * Get length of content octets and maybe find out the underlying type.
 474      */
 475
 476     len = asn1_ex_i2c(pval, NULL, &utype, it);
 477
 478     /*
 479      * If SEQUENCE, SET or OTHER then header is included in pseudo content
 480      * octets so don't include tag+length. We need to check here because the
 481      * call to asn1_ex_i2c() could change utype.
 482      */
 483     if ((utype == V_ASN1_SEQUENCE) || (utype == V_ASN1_SET) ||
 484         (utype == V_ASN1_OTHER))
 485         usetag = 0;
 486     else
 487         usetag = 1;
 488
 489     /* -1 means omit type */
 490
 491     if (len == -1)
 492         return 0;
 493
 494     /* -2 return is special meaning use ndef */
 495     if (len == -2) {
 496         ndef = 2;
 497         len = 0;
 498     }
 499
 500     /* If not implicitly tagged get tag from underlying type */
 501     if (tag == -1)
 502         tag = utype;
 503
 504     /* Output tag+length followed by content octets */
 505     if (out) {
 506         if (usetag)
 507             ASN1_put_object(out, ndef, len, tag, aclass);
 508         asn1_ex_i2c(pval, *out, &utype, it);
 509         if (ndef)
 510             ASN1_put_eoc(out);
 511         else
 512             *out += len;
 513     }
 514
 515     if (usetag)
 516         return ASN1_object_size(ndef, len, tag);
 517     return len;
 518 }
 519
 520 /* Produce content octets from a structure */
 521
 522 static int asn1_ex_i2c(ASN1_VALUE **pval, unsigned char *cout, int *putype,
 523                        const ASN1_ITEM *it)
 524 {
 525     ASN1_BOOLEAN *tbool = NULL;
 526     ASN1_STRING *strtmp;
 527     ASN1_OBJECT *otmp;
 528     int utype;
 529     const unsigned char *cont;
 530     unsigned char c;
 531     int len;
 532     const ASN1_PRIMITIVE_FUNCS *pf;
 533     pf = it->funcs;
 534     if (pf && pf->prim_i2c)
 535         return pf->prim_i2c(pval, cout, putype, it);
 536
 537     /* Should type be omitted? */
 538     if ((it->itype != ASN1_ITYPE_PRIMITIVE)
 539         || (it->utype != V_ASN1_BOOLEAN)) {
 540         if (!*pval)
 541             return -1;
 542     }
 543
 544     if (it->itype == ASN1_ITYPE_MSTRING) {
 545         /* If MSTRING type set the underlying type */
 546         strtmp = (ASN1_STRING *)*pval;
 547         utype = strtmp->type;
 548         *putype = utype;
 549     } else if (it->utype == V_ASN1_ANY) {
 550         /* If ANY set type and pointer to value */
 551         ASN1_TYPE *typ;
 552         typ = (ASN1_TYPE *)*pval;
 553         utype = typ->type;
 554         *putype = utype;
 555         pval = &typ->value.asn1_value;
 556     } else
 557         utype = *putype;
 558
 559     switch (utype) {
 560     case V_ASN1_OBJECT:
 561         otmp = (ASN1_OBJECT *)*pval;
 562         cont = otmp->data;
 563         len = otmp->length;
 564         break;
 565
 566     case V_ASN1_NULL:
 567         cont = NULL;
 568         len = 0;
 569         break;
 570
 571     case V_ASN1_BOOLEAN:
 572         tbool = (ASN1_BOOLEAN *)pval;
 573         if (*tbool == -1)
 574             return -1;
 575         if (it->utype != V_ASN1_ANY) {
 576             /*
 577              * Default handling if value == size field then omit
 578              */
 579             if (*tbool && (it->size > 0))
 580                 return -1;
 581             if (!*tbool && !it->size)
 582                 return -1;
 583         }
 584         c = (unsigned char)*tbool;
 585         cont = &c;
 586         len = 1;
 587         break;
 588
 589     case V_ASN1_BIT_STRING:
 590         return i2c_ASN1_BIT_STRING((ASN1_BIT_STRING *)*pval,
 591                                    cout ? &cout : NULL);
 592
 593     case V_ASN1_INTEGER:
 594     case V_ASN1_NEG_INTEGER:
 595     case V_ASN1_ENUMERATED:
 596     case V_ASN1_NEG_ENUMERATED:
 597         /*
 598          * These are all have the same content format as ASN1_INTEGER
 599          */
 600         return i2c_ASN1_INTEGER((ASN1_INTEGER *)*pval, cout ? &cout : NULL);
 601
 602     case V_ASN1_OCTET_STRING:
 603     case V_ASN1_NUMERICSTRING:
 604     case V_ASN1_PRINTABLESTRING:
 605     case V_ASN1_T61STRING:
 606     case V_ASN1_VIDEOTEXSTRING:
 607     case V_ASN1_IA5STRING:
 608     case V_ASN1_UTCTIME:
 609     case V_ASN1_GENERALIZEDTIME:
 610     case V_ASN1_GRAPHICSTRING:
 611     case V_ASN1_VISIBLESTRING:
 612     case V_ASN1_GENERALSTRING:
 613     case V_ASN1_UNIVERSALSTRING:
 614     case V_ASN1_BMPSTRING:
 615     case V_ASN1_UTF8STRING:
 616     case V_ASN1_SEQUENCE:
 617     case V_ASN1_SET:
 618     default:
 619         /* All based on ASN1_STRING and handled the same */
 620         strtmp = (ASN1_STRING *)*pval;
 621         /* Special handling for NDEF */
 622         if ((it->size == ASN1_TFLG_NDEF)
 623             && (strtmp->flags & ASN1_STRING_FLAG_NDEF)) {
 624             if (cout) {
 625                 strtmp->data = cout;
 626                 strtmp->length = 0;
 627             }
 628             /* Special return code */
 629             return -2;
 630         }
 631         cont = strtmp->data;
 632         len = strtmp->length;
 633
 634         break;
 635
 636     }
 637     if (cout && len)
 638         memcpy(cout, cont, len);
 639     return len;
 640 }