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