Update from stable branch.
[openssl.git] / crypto / asn1 / tasn_dec.c
1 /* tasn_dec.c */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3  * project 2000.
4  */
5 /* ====================================================================
6  * Copyright (c) 2000-2005 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 #include <openssl/buffer.h>
66 #include <openssl/err.h>
67
68 static int asn1_check_eoc(const unsigned char **in, long len);
69 static int asn1_find_end(const unsigned char **in, long len, char inf);
70
71 static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
72                         char inf, int tag, int aclass, int depth);
73
74 static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen);
75
76 static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,
77                                 char *inf, char *cst,
78                                 const unsigned char **in, long len,
79                                 int exptag, int expclass, char opt,
80                                 ASN1_TLC *ctx);
81
82 static int asn1_template_ex_d2i(ASN1_VALUE **pval,
83                                 const unsigned char **in, long len,
84                                 const ASN1_TEMPLATE *tt, char opt,
85                                 ASN1_TLC *ctx);
86 static int asn1_template_noexp_d2i(ASN1_VALUE **val,
87                                 const unsigned char **in, long len,
88                                 const ASN1_TEMPLATE *tt, char opt,
89                                 ASN1_TLC *ctx);
90 static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,
91                                 const unsigned char **in, long len,
92                                 const ASN1_ITEM *it,
93                                 int tag, int aclass, char opt, ASN1_TLC *ctx);
94
95 /* Table to convert tags to bit values, used for MSTRING type */
96 static const unsigned long tag2bit[32] = {
97 0,      0,      0,      B_ASN1_BIT_STRING,      /* tags  0 -  3 */
98 B_ASN1_OCTET_STRING,    0,      0,              B_ASN1_UNKNOWN,/* tags  4- 7 */
99 B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,/* tags  8-11 */
100 B_ASN1_UTF8STRING,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,/* tags 12-15 */
101 B_ASN1_SEQUENCE,0,B_ASN1_NUMERICSTRING,B_ASN1_PRINTABLESTRING, /* tags 16-19 */
102 B_ASN1_T61STRING,B_ASN1_VIDEOTEXSTRING,B_ASN1_IA5STRING,       /* tags 20-22 */
103 B_ASN1_UTCTIME, B_ASN1_GENERALIZEDTIME,                        /* tags 23-24 */ 
104 B_ASN1_GRAPHICSTRING,B_ASN1_ISO64STRING,B_ASN1_GENERALSTRING,  /* tags 25-27 */
105 B_ASN1_UNIVERSALSTRING,B_ASN1_UNKNOWN,B_ASN1_BMPSTRING,B_ASN1_UNKNOWN, /* tags 28-31 */
106         };
107
108 unsigned long ASN1_tag2bit(int tag)
109         {
110         if ((tag < 0) || (tag > 30)) return 0;
111         return tag2bit[tag];
112         }
113
114 /* Macro to initialize and invalidate the cache */
115
116 #define asn1_tlc_clear(c)       if (c) (c)->valid = 0
117 /* Version to avoid compiler warning about 'c' always non-NULL */
118 #define asn1_tlc_clear_nc(c)    (c)->valid = 0
119
120 /* Decode an ASN1 item, this currently behaves just 
121  * like a standard 'd2i' function. 'in' points to 
122  * a buffer to read the data from, in future we will
123  * have more advanced versions that can input data
124  * a piece at a time and this will simply be a special
125  * case.
126  */
127
128 ASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval,
129                 const unsigned char **in, long len, const ASN1_ITEM *it)
130         {
131         ASN1_TLC c;
132         ASN1_VALUE *ptmpval = NULL;
133         if (!pval)
134                 pval = &ptmpval;
135         asn1_tlc_clear_nc(&c);
136         if (ASN1_item_ex_d2i(pval, in, len, it, -1, 0, 0, &c) > 0) 
137                 return *pval;
138         return NULL;
139         }
140
141 int ASN1_template_d2i(ASN1_VALUE **pval,
142                 const unsigned char **in, long len, const ASN1_TEMPLATE *tt)
143         {
144         ASN1_TLC c;
145         asn1_tlc_clear_nc(&c);
146         return asn1_template_ex_d2i(pval, in, len, tt, 0, &c);
147         }
148
149
150 /* Decode an item, taking care of IMPLICIT tagging, if any.
151  * If 'opt' set and tag mismatch return -1 to handle OPTIONAL
152  */
153
154 int ASN1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len,
155                         const ASN1_ITEM *it,
156                         int tag, int aclass, char opt, ASN1_TLC *ctx)
157         {
158         const ASN1_TEMPLATE *tt, *errtt = NULL;
159         const ASN1_COMPAT_FUNCS *cf;
160         const ASN1_EXTERN_FUNCS *ef;
161         const ASN1_AUX *aux = it->funcs;
162         ASN1_aux_cb *asn1_cb;
163         const unsigned char *p = NULL, *q;
164         unsigned char *wp=NULL; /* BIG FAT WARNING!  BREAKS CONST WHERE USED */
165         unsigned char imphack = 0, oclass;
166         char seq_eoc, seq_nolen, cst, isopt;
167         long tmplen;
168         int i;
169         int otag;
170         int ret = 0;
171         ASN1_VALUE *pchval, **pchptr, *ptmpval;
172         if (!pval)
173                 return 0;
174         if (aux && aux->asn1_cb)
175                 asn1_cb = aux->asn1_cb;
176         else asn1_cb = 0;
177
178         switch(it->itype)
179                 {
180                 case ASN1_ITYPE_PRIMITIVE:
181                 if (it->templates)
182                         {
183                         /* tagging or OPTIONAL is currently illegal on an item
184                          * template because the flags can't get passed down.
185                          * In practice this isn't a problem: we include the
186                          * relevant flags from the item template in the
187                          * template itself.
188                          */
189                         if ((tag != -1) || opt)
190                                 {
191                                 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
192                                 ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE);
193                                 goto err;
194                                 }
195                         return asn1_template_ex_d2i(pval, in, len,
196                                         it->templates, opt, ctx);
197                 }
198                 return asn1_d2i_ex_primitive(pval, in, len, it,
199                                                 tag, aclass, opt, ctx);
200                 break;
201
202                 case ASN1_ITYPE_MSTRING:
203                 p = *in;
204                 /* Just read in tag and class */
205                 ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL,
206                                                 &p, len, -1, 0, 1, ctx);
207                 if (!ret)
208                         {
209                         ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
210                                         ERR_R_NESTED_ASN1_ERROR);
211                         goto err;
212                         }
213
214                 /* Must be UNIVERSAL class */
215                 if (oclass != V_ASN1_UNIVERSAL)
216                         {
217                         /* If OPTIONAL, assume this is OK */
218                         if (opt) return -1;
219                         ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
220                                         ASN1_R_MSTRING_NOT_UNIVERSAL);
221                         goto err;
222                         }
223                 /* Check tag matches bit map */
224                 if (!(ASN1_tag2bit(otag) & it->utype))
225                         {
226                         /* If OPTIONAL, assume this is OK */
227                         if (opt)
228                                 return -1;
229                         ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
230                                         ASN1_R_MSTRING_WRONG_TAG);
231                         goto err;
232                         }
233                 return asn1_d2i_ex_primitive(pval, in, len,
234                                                 it, otag, 0, 0, ctx);
235
236                 case ASN1_ITYPE_EXTERN:
237                 /* Use new style d2i */
238                 ef = it->funcs;
239                 return ef->asn1_ex_d2i(pval, in, len,
240                                                 it, tag, aclass, opt, ctx);
241
242                 case ASN1_ITYPE_COMPAT:
243                 /* we must resort to old style evil hackery */
244                 cf = it->funcs;
245
246                 /* If OPTIONAL see if it is there */
247                 if (opt)
248                         {
249                         int exptag;
250                         p = *in;
251                         if (tag == -1)
252                                 exptag = it->utype;
253                         else exptag = tag;
254                         /* Don't care about anything other than presence
255                          * of expected tag */
256
257                         ret = asn1_check_tlen(NULL, NULL, NULL, NULL, NULL,
258                                         &p, len, exptag, aclass, 1, ctx);
259                         if (!ret)
260                                 {
261                                 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
262                                         ERR_R_NESTED_ASN1_ERROR);
263                                 goto err;
264                                 }
265                         if (ret == -1)
266                                 return -1;
267                         }
268
269                 /* This is the old style evil hack IMPLICIT handling:
270                  * since the underlying code is expecting a tag and
271                  * class other than the one present we change the
272                  * buffer temporarily then change it back afterwards.
273                  * This doesn't and never did work for tags > 30.
274                  *
275                  * Yes this is *horrible* but it is only needed for
276                  * old style d2i which will hopefully not be around
277                  * for much longer.
278                  * FIXME: should copy the buffer then modify it so
279                  * the input buffer can be const: we should *always*
280                  * copy because the old style d2i might modify the
281                  * buffer.
282                  */
283
284                 if (tag != -1)
285                         {
286                         wp = *(unsigned char **)in;
287                         imphack = *wp;
288                         if (p == NULL)
289                                 {
290                                 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
291                                         ERR_R_NESTED_ASN1_ERROR);
292                                 goto err;
293                                 }
294                         *wp = (unsigned char)((*p & V_ASN1_CONSTRUCTED)
295                                                                 | it->utype);
296                         }
297
298                 ptmpval = cf->asn1_d2i(pval, in, len);
299
300                 if (tag != -1)
301                         *wp = imphack;
302
303                 if (ptmpval)
304                         return 1;
305
306                 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
307                 goto err;
308
309
310                 case ASN1_ITYPE_CHOICE:
311                 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL))
312                                 goto auxerr;
313
314                 /* Allocate structure */
315                 if (!*pval && !ASN1_item_ex_new(pval, it))
316                         {
317                         ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
318                                                 ERR_R_NESTED_ASN1_ERROR);
319                         goto err;
320                         }
321                 /* CHOICE type, try each possibility in turn */
322                 pchval = NULL;
323                 p = *in;
324                 for (i = 0, tt=it->templates; i < it->tcount; i++, tt++)
325                         {
326                         pchptr = asn1_get_field_ptr(pval, tt);
327                         /* We mark field as OPTIONAL so its absence
328                          * can be recognised.
329                          */
330                         ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx);
331                         /* If field not present, try the next one */
332                         if (ret == -1)
333                                 continue;
334                         /* If positive return, read OK, break loop */
335                         if (ret > 0)
336                                 break;
337                         /* Otherwise must be an ASN1 parsing error */
338                         errtt = tt;
339                         ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
340                                                 ERR_R_NESTED_ASN1_ERROR);
341                         goto err;
342                         }
343
344                 /* Did we fall off the end without reading anything? */
345                 if (i == it->tcount)
346                         {
347                         /* If OPTIONAL, this is OK */
348                         if (opt)
349                                 {
350                                 /* Free and zero it */
351                                 ASN1_item_ex_free(pval, it);
352                                 return -1;
353                                 }
354                         ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
355                                         ASN1_R_NO_MATCHING_CHOICE_TYPE);
356                         goto err;
357                         }
358
359                 asn1_set_choice_selector(pval, i, it);
360                 *in = p;
361                 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL))
362                                 goto auxerr;
363                 return 1;
364
365                 case ASN1_ITYPE_NDEF_SEQUENCE:
366                 case ASN1_ITYPE_SEQUENCE:
367                 p = *in;
368                 tmplen = len;
369
370                 /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
371                 if (tag == -1)
372                         {
373                         tag = V_ASN1_SEQUENCE;
374                         aclass = V_ASN1_UNIVERSAL;
375                         }
376                 /* Get SEQUENCE length and update len, p */
377                 ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst,
378                                         &p, len, tag, aclass, opt, ctx);
379                 if (!ret)
380                         {
381                         ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
382                                         ERR_R_NESTED_ASN1_ERROR);
383                         goto err;
384                         }
385                 else if (ret == -1)
386                         return -1;
387                 if (aux && (aux->flags & ASN1_AFLG_BROKEN))
388                         {
389                         len = tmplen - (p - *in);
390                         seq_nolen = 1;
391                         }
392                 /* If indefinite we don't do a length check */
393                 else seq_nolen = seq_eoc;
394                 if (!cst)
395                         {
396                         ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
397                                 ASN1_R_SEQUENCE_NOT_CONSTRUCTED);
398                         goto err;
399                         }
400
401                 if (!*pval && !ASN1_item_ex_new(pval, it))
402                         {
403                         ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
404                                 ERR_R_NESTED_ASN1_ERROR);
405                         goto err;
406                         }
407
408                 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL))
409                                 goto auxerr;
410
411                 /* Get each field entry */
412                 for (i = 0, tt = it->templates; i < it->tcount; i++, tt++)
413                         {
414                         const ASN1_TEMPLATE *seqtt;
415                         ASN1_VALUE **pseqval;
416                         seqtt = asn1_do_adb(pval, tt, 1);
417                         if (!seqtt)
418                                 goto err;
419                         pseqval = asn1_get_field_ptr(pval, seqtt);
420                         /* Have we ran out of data? */
421                         if (!len)
422                                 break;
423                         q = p;
424                         if (asn1_check_eoc(&p, len))
425                                 {
426                                 if (!seq_eoc)
427                                         {
428                                         ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
429                                                         ASN1_R_UNEXPECTED_EOC);
430                                         goto err;
431                                         }
432                                 len -= p - q;
433                                 seq_eoc = 0;
434                                 q = p;
435                                 break;
436                                 }
437                         /* This determines the OPTIONAL flag value. The field
438                          * cannot be omitted if it is the last of a SEQUENCE
439                          * and there is still data to be read. This isn't
440                          * strictly necessary but it increases efficiency in
441                          * some cases.
442                          */
443                         if (i == (it->tcount - 1))
444                                 isopt = 0;
445                         else isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL);
446                         /* attempt to read in field, allowing each to be
447                          * OPTIONAL */
448
449                         ret = asn1_template_ex_d2i(pseqval, &p, len,
450                                                         seqtt, isopt, ctx);
451                         if (!ret)
452                                 {
453                                 errtt = seqtt;
454                                 goto err;
455                                 }
456                         else if (ret == -1)
457                                 {
458                                 /* OPTIONAL component absent.
459                                  * Free and zero the field.
460                                  */
461                                 ASN1_template_free(pseqval, seqtt);
462                                 continue;
463                                 }
464                         /* Update length */
465                         len -= p - q;
466                         }
467
468                 /* Check for EOC if expecting one */
469                 if (seq_eoc && !asn1_check_eoc(&p, len))
470                         {
471                         ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MISSING_EOC);
472                         goto err;
473                         }
474                 /* Check all data read */
475                 if (!seq_nolen && len)
476                         {
477                         ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
478                                         ASN1_R_SEQUENCE_LENGTH_MISMATCH);
479                         goto err;
480                         }
481
482                 /* If we get here we've got no more data in the SEQUENCE,
483                  * however we may not have read all fields so check all
484                  * remaining are OPTIONAL and clear any that are.
485                  */
486                 for (; i < it->tcount; tt++, i++)
487                         {
488                         const ASN1_TEMPLATE *seqtt;
489                         seqtt = asn1_do_adb(pval, tt, 1);
490                         if (!seqtt)
491                                 goto err;
492                         if (seqtt->flags & ASN1_TFLG_OPTIONAL)
493                                 {
494                                 ASN1_VALUE **pseqval;
495                                 pseqval = asn1_get_field_ptr(pval, seqtt);
496                                 ASN1_template_free(pseqval, seqtt);
497                                 }
498                         else
499                                 {
500                                 errtt = seqtt;
501                                 ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
502                                                         ASN1_R_FIELD_MISSING);
503                                 goto err;
504                                 }
505                         }
506                 /* Save encoding */
507                 if (!asn1_enc_save(pval, *in, p - *in, it))
508                         goto auxerr;
509                 *in = p;
510                 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL))
511                                 goto auxerr;
512                 return 1;
513
514                 default:
515                 return 0;
516                 }
517         auxerr:
518         ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_AUX_ERROR);
519         err:
520         ASN1_item_ex_free(pval, it);
521         if (errtt)
522                 ERR_add_error_data(4, "Field=", errtt->field_name,
523                                         ", Type=", it->sname);
524         else
525                 ERR_add_error_data(2, "Type=", it->sname);
526         return 0;
527         }
528
529 /* Templates are handled with two separate functions.
530  * One handles any EXPLICIT tag and the other handles the rest.
531  */
532
533 static int asn1_template_ex_d2i(ASN1_VALUE **val,
534                                 const unsigned char **in, long inlen,
535                                 const ASN1_TEMPLATE *tt, char opt,
536                                                         ASN1_TLC *ctx)
537         {
538         int flags, aclass;
539         int ret;
540         long len;
541         const unsigned char *p, *q;
542         char exp_eoc;
543         if (!val)
544                 return 0;
545         flags = tt->flags;
546         aclass = flags & ASN1_TFLG_TAG_CLASS;
547
548         p = *in;
549
550         /* Check if EXPLICIT tag expected */
551         if (flags & ASN1_TFLG_EXPTAG)
552                 {
553                 char cst;
554                 /* Need to work out amount of data available to the inner
555                  * content and where it starts: so read in EXPLICIT header to
556                  * get the info.
557                  */
558                 ret = asn1_check_tlen(&len, NULL, NULL, &exp_eoc, &cst,
559                                         &p, inlen, tt->tag, aclass, opt, ctx);
560                 q = p;
561                 if (!ret)
562                         {
563                         ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
564                                         ERR_R_NESTED_ASN1_ERROR);
565                         return 0;
566                         }
567                 else if (ret == -1)
568                         return -1;
569                 if (!cst)
570                         {
571                         ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
572                                         ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED);
573                         return 0;
574                         }
575                 /* We've found the field so it can't be OPTIONAL now */
576                 ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx);
577                 if (!ret)
578                         {
579                         ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
580                                         ERR_R_NESTED_ASN1_ERROR);
581                         return 0;
582                         }
583                 /* We read the field in OK so update length */
584                 len -= p - q;
585                 if (exp_eoc)
586                         {
587                         /* If NDEF we must have an EOC here */
588                         if (!asn1_check_eoc(&p, len))
589                                 {
590                                 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
591                                                 ASN1_R_MISSING_EOC);
592                                 goto err;
593                                 }
594                         }
595                 else
596                         {
597                         /* Otherwise we must hit the EXPLICIT tag end or its
598                          * an error */
599                         if (len)
600                                 {
601                                 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
602                                         ASN1_R_EXPLICIT_LENGTH_MISMATCH);
603                                 goto err;
604                                 }
605                         }
606                 }
607                 else 
608                         return asn1_template_noexp_d2i(val, in, inlen,
609                                                                 tt, opt, ctx);
610
611         *in = p;
612         return 1;
613
614         err:
615         ASN1_template_free(val, tt);
616         *val = NULL;
617         return 0;
618         }
619
620 static int asn1_template_noexp_d2i(ASN1_VALUE **val,
621                                 const unsigned char **in, long len,
622                                 const ASN1_TEMPLATE *tt, char opt,
623                                 ASN1_TLC *ctx)
624         {
625         int flags, aclass;
626         int ret;
627         const unsigned char *p, *q;
628         if (!val)
629                 return 0;
630         flags = tt->flags;
631         aclass = flags & ASN1_TFLG_TAG_CLASS;
632
633         p = *in;
634         q = p;
635
636         if (flags & ASN1_TFLG_SK_MASK)
637                 {
638                 /* SET OF, SEQUENCE OF */
639                 int sktag, skaclass;
640                 char sk_eoc;
641                 /* First work out expected inner tag value */
642                 if (flags & ASN1_TFLG_IMPTAG)
643                         {
644                         sktag = tt->tag;
645                         skaclass = aclass;
646                         }
647                 else
648                         {
649                         skaclass = V_ASN1_UNIVERSAL;
650                         if (flags & ASN1_TFLG_SET_OF)
651                                 sktag = V_ASN1_SET;
652                         else
653                                 sktag = V_ASN1_SEQUENCE;
654                         }
655                 /* Get the tag */
656                 ret = asn1_check_tlen(&len, NULL, NULL, &sk_eoc, NULL,
657                                         &p, len, sktag, skaclass, opt, ctx);
658                 if (!ret)
659                         {
660                         ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
661                                                 ERR_R_NESTED_ASN1_ERROR);
662                         return 0;
663                         }
664                 else if (ret == -1)
665                         return -1;
666                 if (!*val)
667                         *val = (ASN1_VALUE *)sk_new_null();
668                 else
669                         {
670                         /* We've got a valid STACK: free up any items present */
671                         STACK_OF(ASN1_VALUE) *sktmp
672                             = (STACK_OF(ASN1_VALUE) *)*val;
673                         ASN1_VALUE *vtmp;
674                         while(sk_ASN1_VALUE_num(sktmp) > 0)
675                                 {
676                                 vtmp = sk_ASN1_VALUE_pop(sktmp);
677                                 ASN1_item_ex_free(&vtmp,
678                                                 ASN1_ITEM_ptr(tt->item));
679                                 }
680                         }
681                                 
682                 if (!*val)
683                         {
684                         ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
685                                                 ERR_R_MALLOC_FAILURE);
686                         goto err;
687                         }
688
689                 /* Read as many items as we can */
690                 while(len > 0)
691                         {
692                         ASN1_VALUE *skfield;
693                         q = p;
694                         /* See if EOC found */
695                         if (asn1_check_eoc(&p, len))
696                                 {
697                                 if (!sk_eoc)
698                                         {
699                                         ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
700                                                         ASN1_R_UNEXPECTED_EOC);
701                                         goto err;
702                                         }
703                                 len -= p - q;
704                                 sk_eoc = 0;
705                                 break;
706                                 }
707                         skfield = NULL;
708                         if (!ASN1_item_ex_d2i(&skfield, &p, len,
709                                                 ASN1_ITEM_ptr(tt->item),
710                                                 -1, 0, 0, ctx))
711                                 {
712                                 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
713                                         ERR_R_NESTED_ASN1_ERROR);
714                                 goto err;
715                                 }
716                         len -= p - q;
717                         if (!sk_ASN1_VALUE_push((STACK_OF(ASN1_VALUE) *)*val,
718                                                 skfield))
719                                 {
720                                 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
721                                                 ERR_R_MALLOC_FAILURE);
722                                 goto err;
723                                 }
724                         }
725                 if (sk_eoc)
726                         {
727                         ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ASN1_R_MISSING_EOC);
728                         goto err;
729                         }
730                 }
731         else if (flags & ASN1_TFLG_IMPTAG)
732                 {
733                 /* IMPLICIT tagging */
734                 ret = ASN1_item_ex_d2i(val, &p, len,
735                         ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt, ctx);
736                 if (!ret)
737                         {
738                         ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
739                                                 ERR_R_NESTED_ASN1_ERROR);
740                         goto err;
741                         }
742                 else if (ret == -1)
743                         return -1;
744                 }
745         else
746                 {
747                 /* Nothing special */
748                 ret = ASN1_item_ex_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item),
749                                                         -1, 0, opt, ctx);
750                 if (!ret)
751                         {
752                         ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
753                                         ERR_R_NESTED_ASN1_ERROR);
754                         goto err;
755                         }
756                 else if (ret == -1)
757                         return -1;
758                 }
759
760         *in = p;
761         return 1;
762
763         err:
764         ASN1_template_free(val, tt);
765         *val = NULL;
766         return 0;
767         }
768
769 static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,
770                                 const unsigned char **in, long inlen, 
771                                 const ASN1_ITEM *it,
772                                 int tag, int aclass, char opt, ASN1_TLC *ctx)
773         {
774         int ret = 0, utype;
775         long plen;
776         char cst, inf, free_cont = 0;
777         const unsigned char *p;
778         BUF_MEM buf;
779         const unsigned char *cont = NULL;
780         long len; 
781         if (!pval)
782                 {
783                 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_NULL);
784                 return 0; /* Should never happen */
785                 }
786
787         if (it->itype == ASN1_ITYPE_MSTRING)
788                 {
789                 utype = tag;
790                 tag = -1;
791                 }
792         else
793                 utype = it->utype;
794
795         if (utype == V_ASN1_ANY)
796                 {
797                 /* If type is ANY need to figure out type from tag */
798                 unsigned char oclass;
799                 if (tag >= 0)
800                         {
801                         ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
802                                         ASN1_R_ILLEGAL_TAGGED_ANY);
803                         return 0;
804                         }
805                 if (opt)
806                         {
807                         ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
808                                         ASN1_R_ILLEGAL_OPTIONAL_ANY);
809                         return 0;
810                         }
811                 p = *in;
812                 ret = asn1_check_tlen(NULL, &utype, &oclass, NULL, NULL,
813                                         &p, inlen, -1, 0, 0, ctx);
814                 if (!ret)
815                         {
816                         ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
817                                         ERR_R_NESTED_ASN1_ERROR);
818                         return 0;
819                         }
820                 if (oclass != V_ASN1_UNIVERSAL)
821                         utype = V_ASN1_OTHER;
822                 }
823         if (tag == -1)
824                 {
825                 tag = utype;
826                 aclass = V_ASN1_UNIVERSAL;
827                 }
828         p = *in;
829         /* Check header */
830         ret = asn1_check_tlen(&plen, NULL, NULL, &inf, &cst,
831                                 &p, inlen, tag, aclass, opt, ctx);
832         if (!ret)
833                 {
834                 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR);
835                 return 0;
836                 }
837         else if (ret == -1)
838                 return -1;
839         ret = 0;
840         /* SEQUENCE, SET and "OTHER" are left in encoded form */
841         if ((utype == V_ASN1_SEQUENCE)
842                 || (utype == V_ASN1_SET) || (utype == V_ASN1_OTHER))
843                 {
844                 /* Clear context cache for type OTHER because the auto clear
845                  * when we have a exact match wont work
846                  */
847                 if (utype == V_ASN1_OTHER)
848                         {
849                         asn1_tlc_clear(ctx);
850                         }
851                 /* SEQUENCE and SET must be constructed */
852                 else if (!cst)
853                         {
854                         ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
855                                 ASN1_R_TYPE_NOT_CONSTRUCTED);
856                         return 0;
857                         }
858
859                 cont = *in;
860                 /* If indefinite length constructed find the real end */
861                 if (inf)
862                         {
863                         if (!asn1_find_end(&p, plen, inf))
864                                  goto err;
865                         len = p - cont;
866                         }
867                 else
868                         {
869                         len = p - cont + plen;
870                         p += plen;
871                         buf.data = NULL;
872                         }
873                 }
874         else if (cst)
875                 {
876                 buf.length = 0;
877                 buf.max = 0;
878                 buf.data = NULL;
879                 /* Should really check the internal tags are correct but
880                  * some things may get this wrong. The relevant specs
881                  * say that constructed string types should be OCTET STRINGs
882                  * internally irrespective of the type. So instead just check
883                  * for UNIVERSAL class and ignore the tag.
884                  */
885                 if (!asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL, 0))
886                         {
887                         free_cont = 1;
888                         goto err;
889                         }
890                 len = buf.length;
891                 /* Append a final null to string */
892                 if (!BUF_MEM_grow_clean(&buf, len + 1))
893                         {
894                         ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
895                                                 ERR_R_MALLOC_FAILURE);
896                         return 0;
897                         }
898                 buf.data[len] = 0;
899                 cont = (const unsigned char *)buf.data;
900                 free_cont = 1;
901                 }
902         else
903                 {
904                 cont = p;
905                 len = plen;
906                 p += plen;
907                 }
908
909         /* We now have content length and type: translate into a structure */
910         if (!asn1_ex_c2i(pval, cont, len, utype, &free_cont, it))
911                 goto err;
912
913         *in = p;
914         ret = 1;
915         err:
916         if (free_cont && buf.data) OPENSSL_free(buf.data);
917         return ret;
918         }
919
920 /* Translate ASN1 content octets into a structure */
921
922 int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
923                         int utype, char *free_cont, const ASN1_ITEM *it)
924         {
925         ASN1_VALUE **opval = NULL;
926         ASN1_STRING *stmp;
927         ASN1_TYPE *typ = NULL;
928         int ret = 0;
929         const ASN1_PRIMITIVE_FUNCS *pf;
930         ASN1_INTEGER **tint;
931         pf = it->funcs;
932
933         if (pf && pf->prim_c2i)
934                 return pf->prim_c2i(pval, cont, len, utype, free_cont, it);
935         /* If ANY type clear type and set pointer to internal value */
936         if (it->utype == V_ASN1_ANY)
937                 {
938                 if (!*pval)
939                         {
940                         typ = ASN1_TYPE_new();
941                         if (typ == NULL)
942                                 goto err;
943                         *pval = (ASN1_VALUE *)typ;
944                         }
945                 else
946                         typ = (ASN1_TYPE *)*pval;
947
948                 if (utype != typ->type)
949                         ASN1_TYPE_set(typ, utype, NULL);
950                 opval = pval;
951                 pval = &typ->value.asn1_value;
952                 }
953         switch(utype)
954                 {
955                 case V_ASN1_OBJECT:
956                 if (!c2i_ASN1_OBJECT((ASN1_OBJECT **)pval, &cont, len))
957                         goto err;
958                 break;
959
960                 case V_ASN1_NULL:
961                 if (len)
962                         {
963                         ASN1err(ASN1_F_ASN1_EX_C2I,
964                                                 ASN1_R_NULL_IS_WRONG_LENGTH);
965                         goto err;
966                         }
967                 *pval = (ASN1_VALUE *)1;
968                 break;
969
970                 case V_ASN1_BOOLEAN:
971                 if (len != 1)
972                         {
973                         ASN1err(ASN1_F_ASN1_EX_C2I,
974                                                 ASN1_R_BOOLEAN_IS_WRONG_LENGTH);
975                         goto err;
976                         }
977                 else
978                         {
979                         ASN1_BOOLEAN *tbool;
980                         tbool = (ASN1_BOOLEAN *)pval;
981                         *tbool = *cont;
982                         }
983                 break;
984
985                 case V_ASN1_BIT_STRING:
986                 if (!c2i_ASN1_BIT_STRING((ASN1_BIT_STRING **)pval, &cont, len))
987                         goto err;
988                 break;
989
990                 case V_ASN1_INTEGER:
991                 case V_ASN1_NEG_INTEGER:
992                 case V_ASN1_ENUMERATED:
993                 case V_ASN1_NEG_ENUMERATED:
994                 tint = (ASN1_INTEGER **)pval;
995                 if (!c2i_ASN1_INTEGER(tint, &cont, len))
996                         goto err;
997                 /* Fixup type to match the expected form */
998                 (*tint)->type = utype | ((*tint)->type & V_ASN1_NEG);
999                 break;
1000
1001                 case V_ASN1_OCTET_STRING:
1002                 case V_ASN1_NUMERICSTRING:
1003                 case V_ASN1_PRINTABLESTRING:
1004                 case V_ASN1_T61STRING:
1005                 case V_ASN1_VIDEOTEXSTRING:
1006                 case V_ASN1_IA5STRING:
1007                 case V_ASN1_UTCTIME:
1008                 case V_ASN1_GENERALIZEDTIME:
1009                 case V_ASN1_GRAPHICSTRING:
1010                 case V_ASN1_VISIBLESTRING:
1011                 case V_ASN1_GENERALSTRING:
1012                 case V_ASN1_UNIVERSALSTRING:
1013                 case V_ASN1_BMPSTRING:
1014                 case V_ASN1_UTF8STRING:
1015                 case V_ASN1_OTHER:
1016                 case V_ASN1_SET:
1017                 case V_ASN1_SEQUENCE:
1018                 default:
1019                 /* All based on ASN1_STRING and handled the same */
1020                 if (!*pval)
1021                         {
1022                         stmp = ASN1_STRING_type_new(utype);
1023                         if (!stmp)
1024                                 {
1025                                 ASN1err(ASN1_F_ASN1_EX_C2I,
1026                                                         ERR_R_MALLOC_FAILURE);
1027                                 goto err;
1028                                 }
1029                         *pval = (ASN1_VALUE *)stmp;
1030                         }
1031                 else
1032                         {
1033                         stmp = (ASN1_STRING *)*pval;
1034                         stmp->type = utype;
1035                         }
1036                 /* If we've already allocated a buffer use it */
1037                 if (*free_cont)
1038                         {
1039                         if (stmp->data)
1040                                 OPENSSL_free(stmp->data);
1041                         stmp->data = (unsigned char *)cont; /* UGLY CAST! RL */
1042                         stmp->length = len;
1043                         *free_cont = 0;
1044                         }
1045                 else
1046                         {
1047                         if (!ASN1_STRING_set(stmp, cont, len))
1048                                 {
1049                                 ASN1err(ASN1_F_ASN1_EX_C2I,
1050                                                         ERR_R_MALLOC_FAILURE);
1051                                 ASN1_STRING_free(stmp); 
1052                                 *pval = NULL;
1053                                 goto err;
1054                                 }
1055                         }
1056                 break;
1057                 }
1058         /* If ASN1_ANY and NULL type fix up value */
1059         if (typ && (utype == V_ASN1_NULL))
1060                  typ->value.ptr = NULL;
1061
1062         ret = 1;
1063         err:
1064         if (!ret)
1065                 {
1066                 ASN1_TYPE_free(typ);
1067                 if (opval)
1068                         *opval = NULL;
1069                 }
1070         return ret;
1071         }
1072
1073
1074 /* This function finds the end of an ASN1 structure when passed its maximum
1075  * length, whether it is indefinite length and a pointer to the content.
1076  * This is more efficient than calling asn1_collect because it does not
1077  * recurse on each indefinite length header.
1078  */
1079
1080 static int asn1_find_end(const unsigned char **in, long len, char inf)
1081         {
1082         int expected_eoc;
1083         long plen;
1084         const unsigned char *p = *in, *q;
1085         /* If not indefinite length constructed just add length */
1086         if (inf == 0)
1087                 {
1088                 *in += len;
1089                 return 1;
1090                 }
1091         expected_eoc = 1;
1092         /* Indefinite length constructed form. Find the end when enough EOCs
1093          * are found. If more indefinite length constructed headers
1094          * are encountered increment the expected eoc count otherwise just
1095          * skip to the end of the data.
1096          */
1097         while (len > 0)
1098                 {
1099                 if(asn1_check_eoc(&p, len))
1100                         {
1101                         expected_eoc--;
1102                         if (expected_eoc == 0)
1103                                 break;
1104                         len -= 2;
1105                         continue;
1106                         }
1107                 q = p;
1108                 /* Just read in a header: only care about the length */
1109                 if(!asn1_check_tlen(&plen, NULL, NULL, &inf, NULL, &p, len,
1110                                 -1, 0, 0, NULL))
1111                         {
1112                         ASN1err(ASN1_F_ASN1_FIND_END, ERR_R_NESTED_ASN1_ERROR);
1113                         return 0;
1114                         }
1115                 if (inf)
1116                         expected_eoc++;
1117                 else
1118                         p += plen;
1119                 len -= p - q;
1120                 }
1121         if (expected_eoc)
1122                 {
1123                 ASN1err(ASN1_F_ASN1_FIND_END, ASN1_R_MISSING_EOC);
1124                 return 0;
1125                 }
1126         *in = p;
1127         return 1;
1128         }
1129 /* This function collects the asn1 data from a constructred string
1130  * type into a buffer. The values of 'in' and 'len' should refer
1131  * to the contents of the constructed type and 'inf' should be set
1132  * if it is indefinite length.
1133  */
1134
1135 #ifndef ASN1_MAX_STRING_NEST
1136 /* This determines how many levels of recursion are permitted in ASN1
1137  * string types. If it is not limited stack overflows can occur. If set
1138  * to zero no recursion is allowed at all. Although zero should be adequate
1139  * examples exist that require a value of 1. So 5 should be more than enough.
1140  */
1141 #define ASN1_MAX_STRING_NEST 5
1142 #endif
1143
1144
1145 static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
1146                         char inf, int tag, int aclass, int depth)
1147         {
1148         const unsigned char *p, *q;
1149         long plen;
1150         char cst, ininf;
1151         p = *in;
1152         inf &= 1;
1153         /* If no buffer and not indefinite length constructed just pass over
1154          * the encoded data */
1155         if (!buf && !inf)
1156                 {
1157                 *in += len;
1158                 return 1;
1159                 }
1160         while(len > 0)
1161                 {
1162                 q = p;
1163                 /* Check for EOC */
1164                 if (asn1_check_eoc(&p, len))
1165                         {
1166                         /* EOC is illegal outside indefinite length
1167                          * constructed form */
1168                         if (!inf)
1169                                 {
1170                                 ASN1err(ASN1_F_ASN1_COLLECT,
1171                                         ASN1_R_UNEXPECTED_EOC);
1172                                 return 0;
1173                                 }
1174                         inf = 0;
1175                         break;
1176                         }
1177
1178                 if (!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p,
1179                                         len, tag, aclass, 0, NULL))
1180                         {
1181                         ASN1err(ASN1_F_ASN1_COLLECT, ERR_R_NESTED_ASN1_ERROR);
1182                         return 0;
1183                         }
1184
1185                 /* If indefinite length constructed update max length */
1186                 if (cst)
1187                         {
1188                         if (depth >= ASN1_MAX_STRING_NEST)
1189                                 {
1190                                 ASN1err(ASN1_F_ASN1_COLLECT,
1191                                         ASN1_R_NESTED_ASN1_STRING);
1192                                 return 0;
1193                                 }
1194                         if (!asn1_collect(buf, &p, plen, ininf, tag, aclass,
1195                                                 depth + 1))
1196                                 return 0;
1197                         }
1198                 else if (plen && !collect_data(buf, &p, plen))
1199                         return 0;
1200                 len -= p - q;
1201                 }
1202         if (inf)
1203                 {
1204                 ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_MISSING_EOC);
1205                 return 0;
1206                 }
1207         *in = p;
1208         return 1;
1209         }
1210
1211 static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen)
1212         {
1213         int len;
1214         if (buf)
1215                 {
1216                 len = buf->length;
1217                 if (!BUF_MEM_grow_clean(buf, len + plen))
1218                         {
1219                         ASN1err(ASN1_F_COLLECT_DATA, ERR_R_MALLOC_FAILURE);
1220                         return 0;
1221                         }
1222                 memcpy(buf->data + len, *p, plen);
1223                 }
1224         *p += plen;
1225         return 1;
1226         }
1227
1228 /* Check for ASN1 EOC and swallow it if found */
1229
1230 static int asn1_check_eoc(const unsigned char **in, long len)
1231         {
1232         const unsigned char *p;
1233         if (len < 2) return 0;
1234         p = *in;
1235         if (!p[0] && !p[1])
1236                 {
1237                 *in += 2;
1238                 return 1;
1239                 }
1240         return 0;
1241         }
1242
1243 /* Check an ASN1 tag and length: a bit like ASN1_get_object
1244  * but it sets the length for indefinite length constructed
1245  * form, we don't know the exact length but we can set an
1246  * upper bound to the amount of data available minus the
1247  * header length just read.
1248  */
1249
1250 static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,
1251                                 char *inf, char *cst,
1252                                 const unsigned char **in, long len,
1253                                 int exptag, int expclass, char opt,
1254                                 ASN1_TLC *ctx)
1255         {
1256         int i;
1257         int ptag, pclass;
1258         long plen;
1259         const unsigned char *p, *q;
1260         p = *in;
1261         q = p;
1262
1263         if (ctx && ctx->valid)
1264                 {
1265                 i = ctx->ret;
1266                 plen = ctx->plen;
1267                 pclass = ctx->pclass;
1268                 ptag = ctx->ptag;
1269                 p += ctx->hdrlen;
1270                 }
1271         else
1272                 {
1273                 i = ASN1_get_object(&p, &plen, &ptag, &pclass, len);
1274                 if (ctx)
1275                         {
1276                         ctx->ret = i;
1277                         ctx->plen = plen;
1278                         ctx->pclass = pclass;
1279                         ctx->ptag = ptag;
1280                         ctx->hdrlen = p - q;
1281                         ctx->valid = 1;
1282                         /* If definite length, and no error, length +
1283                          * header can't exceed total amount of data available. 
1284                          */
1285                         if (!(i & 0x81) && ((plen + ctx->hdrlen) > len))
1286                                 {
1287                                 ASN1err(ASN1_F_ASN1_CHECK_TLEN,
1288                                                         ASN1_R_TOO_LONG);
1289                                 asn1_tlc_clear(ctx);
1290                                 return 0;
1291                                 }
1292                         }
1293                 }
1294
1295         if (i & 0x80)
1296                 {
1297                 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_BAD_OBJECT_HEADER);
1298                 asn1_tlc_clear(ctx);
1299                 return 0;
1300                 }
1301         if (exptag >= 0)
1302                 {
1303                 if ((exptag != ptag) || (expclass != pclass))
1304                         {
1305                         /* If type is OPTIONAL, not an error:
1306                          * indicate missing type.
1307                          */
1308                         if (opt) return -1;
1309                         asn1_tlc_clear(ctx);
1310                         ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_WRONG_TAG);
1311                         return 0;
1312                         }
1313                 /* We have a tag and class match:
1314                  * assume we are going to do something with it */
1315                 asn1_tlc_clear(ctx);
1316                 }
1317
1318         if (i & 1)
1319                 plen = len - (p - q);
1320
1321         if (inf)
1322                 *inf = i & 1;
1323
1324         if (cst)
1325                 *cst = i & V_ASN1_CONSTRUCTED;
1326
1327         if (olen)
1328                 *olen = plen;
1329
1330         if (oclass)
1331                 *oclass = pclass;
1332
1333         if (otag)
1334                 *otag = ptag;
1335
1336         *in = p;
1337         return 1;
1338         }