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