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1/* $OpenBSD: asn1t.h,v 1.24 2024/07/08 16:24:22 beck Exp $ */
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#ifndef HEADER_ASN1T_H
59#define HEADER_ASN1T_H
60
61#include <stddef.h>
62
63#include <openssl/opensslconf.h>
64
65#include <openssl/asn1.h>
66
67/* ASN1 template defines, structures and functions */
68
69#ifdef __cplusplus
70extern "C" {
71#endif
72
73#ifndef LIBRESSL_INTERNAL
74
75/* Macro to obtain ASN1_ADB pointer from a type (only used internally) */
76#define ASN1_ADB_ptr(iptr) ((const ASN1_ADB *)(iptr))
77
78
79/* Macros for start and end of ASN1_ITEM definition */
80
81#define ASN1_ITEM_start(itname) \
82 const ASN1_ITEM itname##_it = {
83
84#define static_ASN1_ITEM_start(itname) \
85 static const ASN1_ITEM itname##_it = {
86
87#define ASN1_ITEM_end(itname) \
88 };
89
90
91
92/* Macros to aid ASN1 template writing */
93
94#define ASN1_ITEM_TEMPLATE(tname) \
95 static const ASN1_TEMPLATE tname##_item_tt
96
97#define ASN1_ITEM_TEMPLATE_END(tname) \
98 ;\
99 ASN1_ITEM_start(tname) \
100 ASN1_ITYPE_PRIMITIVE,\
101 -1,\
102 &tname##_item_tt,\
103 0,\
104 NULL,\
105 0,\
106 #tname \
107 ASN1_ITEM_end(tname)
108
109#define static_ASN1_ITEM_TEMPLATE_END(tname) \
110 ;\
111 static_ASN1_ITEM_start(tname) \
112 ASN1_ITYPE_PRIMITIVE,\
113 -1,\
114 &tname##_item_tt,\
115 0,\
116 NULL,\
117 0,\
118 #tname \
119 ASN1_ITEM_end(tname)
120
121
122/* This is a ASN1 type which just embeds a template */
123
124/*
125 * This pair helps declare a SEQUENCE. We can do:
126 *
127 * ASN1_SEQUENCE(stname) = {
128 * ... SEQUENCE components ...
129 * } ASN1_SEQUENCE_END(stname)
130 *
131 * This will produce an ASN1_ITEM called stname_it
132 * for a structure called stname.
133 *
134 * If you want the same structure but a different
135 * name then use:
136 *
137 * ASN1_SEQUENCE(itname) = {
138 * ... SEQUENCE components ...
139 * } ASN1_SEQUENCE_END_name(stname, itname)
140 *
141 * This will create an item called itname_it using
142 * a structure called stname.
143 */
144
145#define ASN1_SEQUENCE(tname) \
146 static const ASN1_TEMPLATE tname##_seq_tt[]
147
148#define ASN1_SEQUENCE_END(stname) ASN1_SEQUENCE_END_name(stname, stname)
149
150#define static_ASN1_SEQUENCE_END(stname) static_ASN1_SEQUENCE_END_name(stname, stname)
151
152#define ASN1_SEQUENCE_END_name(stname, tname) \
153 ;\
154 ASN1_ITEM_start(tname) \
155 ASN1_ITYPE_SEQUENCE,\
156 V_ASN1_SEQUENCE,\
157 tname##_seq_tt,\
158 sizeof(tname##_seq_tt) / sizeof(ASN1_TEMPLATE),\
159 NULL,\
160 sizeof(stname),\
161 #stname \
162 ASN1_ITEM_end(tname)
163
164#define static_ASN1_SEQUENCE_END_name(stname, tname) \
165 ;\
166 static_ASN1_ITEM_start(tname) \
167 ASN1_ITYPE_SEQUENCE,\
168 V_ASN1_SEQUENCE,\
169 tname##_seq_tt,\
170 sizeof(tname##_seq_tt) / sizeof(ASN1_TEMPLATE),\
171 NULL,\
172 sizeof(stname),\
173 #stname \
174 ASN1_ITEM_end(tname)
175
176#define ASN1_NDEF_SEQUENCE(tname) \
177 ASN1_SEQUENCE(tname)
178
179#define ASN1_NDEF_SEQUENCE_cb(tname, cb) \
180 ASN1_SEQUENCE_cb(tname, cb)
181
182#define ASN1_SEQUENCE_cb(tname, cb) \
183 static const ASN1_AUX tname##_aux = {NULL, 0, 0, 0, cb, 0}; \
184 ASN1_SEQUENCE(tname)
185
186#define ASN1_SEQUENCE_ref(tname, cb, lck) \
187 static const ASN1_AUX tname##_aux = {NULL, ASN1_AFLG_REFCOUNT, offsetof(tname, references), lck, cb, 0}; \
188 ASN1_SEQUENCE(tname)
189
190#define ASN1_SEQUENCE_enc(tname, enc, cb) \
191 static const ASN1_AUX tname##_aux = {NULL, ASN1_AFLG_ENCODING, 0, 0, cb, offsetof(tname, enc)}; \
192 ASN1_SEQUENCE(tname)
193
194#define ASN1_NDEF_SEQUENCE_END(tname) \
195 ;\
196 ASN1_ITEM_start(tname) \
197 ASN1_ITYPE_NDEF_SEQUENCE,\
198 V_ASN1_SEQUENCE,\
199 tname##_seq_tt,\
200 sizeof(tname##_seq_tt) / sizeof(ASN1_TEMPLATE),\
201 NULL,\
202 sizeof(tname),\
203 #tname \
204 ASN1_ITEM_end(tname)
205
206#define static_ASN1_NDEF_SEQUENCE_END(tname) \
207 ;\
208 static_ASN1_ITEM_start(tname) \
209 ASN1_ITYPE_NDEF_SEQUENCE,\
210 V_ASN1_SEQUENCE,\
211 tname##_seq_tt,\
212 sizeof(tname##_seq_tt) / sizeof(ASN1_TEMPLATE),\
213 NULL,\
214 sizeof(tname),\
215 #tname \
216 ASN1_ITEM_end(tname)
217
218#define ASN1_SEQUENCE_END_enc(stname, tname) ASN1_SEQUENCE_END_ref(stname, tname)
219
220#define ASN1_SEQUENCE_END_cb(stname, tname) ASN1_SEQUENCE_END_ref(stname, tname)
221
222#define static_ASN1_SEQUENCE_END_cb(stname, tname) static_ASN1_SEQUENCE_END_ref(stname, tname)
223
224#define ASN1_SEQUENCE_END_ref(stname, tname) \
225 ;\
226 ASN1_ITEM_start(tname) \
227 ASN1_ITYPE_SEQUENCE,\
228 V_ASN1_SEQUENCE,\
229 tname##_seq_tt,\
230 sizeof(tname##_seq_tt) / sizeof(ASN1_TEMPLATE),\
231 &tname##_aux,\
232 sizeof(stname),\
233 #stname \
234 ASN1_ITEM_end(tname)
235
236#define static_ASN1_SEQUENCE_END_ref(stname, tname) \
237 ;\
238 static_ASN1_ITEM_start(tname) \
239 ASN1_ITYPE_SEQUENCE,\
240 V_ASN1_SEQUENCE,\
241 tname##_seq_tt,\
242 sizeof(tname##_seq_tt) / sizeof(ASN1_TEMPLATE),\
243 &tname##_aux,\
244 sizeof(stname),\
245 #stname \
246 ASN1_ITEM_end(tname)
247
248#define ASN1_NDEF_SEQUENCE_END_cb(stname, tname) \
249 ;\
250 ASN1_ITEM_start(tname) \
251 ASN1_ITYPE_NDEF_SEQUENCE,\
252 V_ASN1_SEQUENCE,\
253 tname##_seq_tt,\
254 sizeof(tname##_seq_tt) / sizeof(ASN1_TEMPLATE),\
255 &tname##_aux,\
256 sizeof(stname),\
257 #stname \
258 ASN1_ITEM_end(tname)
259
260
261/*
262 * This pair helps declare a CHOICE type. We can do:
263 *
264 * ASN1_CHOICE(chname) = {
265 * ... CHOICE options ...
266 * ASN1_CHOICE_END(chname)
267 *
268 * This will produce an ASN1_ITEM called chname_it
269 * for a structure called chname. The structure
270 * definition must look like this:
271 * typedef struct {
272 * int type;
273 * union {
274 * ASN1_SOMETHING *opt1;
275 * ASN1_SOMEOTHER *opt2;
276 * } value;
277 * } chname;
278 *
279 * the name of the selector must be 'type'.
280 * to use an alternative selector name use the
281 * ASN1_CHOICE_END_selector() version.
282 */
283
284#define ASN1_CHOICE(tname) \
285 static const ASN1_TEMPLATE tname##_ch_tt[]
286
287#define ASN1_CHOICE_cb(tname, cb) \
288 static const ASN1_AUX tname##_aux = {NULL, 0, 0, 0, cb, 0}; \
289 ASN1_CHOICE(tname)
290
291#define ASN1_CHOICE_END(stname) ASN1_CHOICE_END_name(stname, stname)
292
293#define static_ASN1_CHOICE_END(stname) static_ASN1_CHOICE_END_name(stname, stname)
294
295#define ASN1_CHOICE_END_name(stname, tname) ASN1_CHOICE_END_selector(stname, tname, type)
296
297#define static_ASN1_CHOICE_END_name(stname, tname) static_ASN1_CHOICE_END_selector(stname, tname, type)
298
299#define ASN1_CHOICE_END_selector(stname, tname, selname) \
300 ;\
301 ASN1_ITEM_start(tname) \
302 ASN1_ITYPE_CHOICE,\
303 offsetof(stname,selname) ,\
304 tname##_ch_tt,\
305 sizeof(tname##_ch_tt) / sizeof(ASN1_TEMPLATE),\
306 NULL,\
307 sizeof(stname),\
308 #stname \
309 ASN1_ITEM_end(tname)
310
311#define static_ASN1_CHOICE_END_selector(stname, tname, selname) \
312 ;\
313 static_ASN1_ITEM_start(tname) \
314 ASN1_ITYPE_CHOICE,\
315 offsetof(stname,selname) ,\
316 tname##_ch_tt,\
317 sizeof(tname##_ch_tt) / sizeof(ASN1_TEMPLATE),\
318 NULL,\
319 sizeof(stname),\
320 #stname \
321 ASN1_ITEM_end(tname)
322
323#define ASN1_CHOICE_END_cb(stname, tname, selname) \
324 ;\
325 ASN1_ITEM_start(tname) \
326 ASN1_ITYPE_CHOICE,\
327 offsetof(stname,selname) ,\
328 tname##_ch_tt,\
329 sizeof(tname##_ch_tt) / sizeof(ASN1_TEMPLATE),\
330 &tname##_aux,\
331 sizeof(stname),\
332 #stname \
333 ASN1_ITEM_end(tname)
334
335/* This helps with the template wrapper form of ASN1_ITEM */
336
337#define ASN1_EX_TEMPLATE_TYPE(flags, tag, name, type) { \
338 (flags), (tag), 0,\
339 #name, ASN1_ITEM_ref(type) }
340
341/* These help with SEQUENCE or CHOICE components */
342
343/* used to declare other types */
344
345#define ASN1_EX_TYPE(flags, tag, stname, field, type) { \
346 (flags), (tag), offsetof(stname, field),\
347 #field, ASN1_ITEM_ref(type) }
348
349/* implicit and explicit helper macros */
350
351#define ASN1_IMP_EX(stname, field, type, tag, ex) \
352 ASN1_EX_TYPE(ASN1_TFLG_IMPLICIT | ex, tag, stname, field, type)
353
354#define ASN1_EXP_EX(stname, field, type, tag, ex) \
355 ASN1_EX_TYPE(ASN1_TFLG_EXPLICIT | ex, tag, stname, field, type)
356
357/* Any defined by macros: the field used is in the table itself */
358
359#define ASN1_ADB_OBJECT(tblname) { ASN1_TFLG_ADB_OID, -1, 0, #tblname, (const ASN1_ITEM *)&(tblname##_adb) }
360#define ASN1_ADB_INTEGER(tblname) { ASN1_TFLG_ADB_INT, -1, 0, #tblname, (const ASN1_ITEM *)&(tblname##_adb) }
361/* Plain simple type */
362#define ASN1_SIMPLE(stname, field, type) ASN1_EX_TYPE(0,0, stname, field, type)
363
364/* OPTIONAL simple type */
365#define ASN1_OPT(stname, field, type) ASN1_EX_TYPE(ASN1_TFLG_OPTIONAL, 0, stname, field, type)
366
367/* IMPLICIT tagged simple type */
368#define ASN1_IMP(stname, field, type, tag) ASN1_IMP_EX(stname, field, type, tag, 0)
369
370/* IMPLICIT tagged OPTIONAL simple type */
371#define ASN1_IMP_OPT(stname, field, type, tag) ASN1_IMP_EX(stname, field, type, tag, ASN1_TFLG_OPTIONAL)
372
373/* Same as above but EXPLICIT */
374
375#define ASN1_EXP(stname, field, type, tag) ASN1_EXP_EX(stname, field, type, tag, 0)
376#define ASN1_EXP_OPT(stname, field, type, tag) ASN1_EXP_EX(stname, field, type, tag, ASN1_TFLG_OPTIONAL)
377
378/* SEQUENCE OF type */
379#define ASN1_SEQUENCE_OF(stname, field, type) \
380 ASN1_EX_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, stname, field, type)
381
382/* OPTIONAL SEQUENCE OF */
383#define ASN1_SEQUENCE_OF_OPT(stname, field, type) \
384 ASN1_EX_TYPE(ASN1_TFLG_SEQUENCE_OF|ASN1_TFLG_OPTIONAL, 0, stname, field, type)
385
386/* Same as above but for SET OF */
387
388#define ASN1_SET_OF(stname, field, type) \
389 ASN1_EX_TYPE(ASN1_TFLG_SET_OF, 0, stname, field, type)
390
391#define ASN1_SET_OF_OPT(stname, field, type) \
392 ASN1_EX_TYPE(ASN1_TFLG_SET_OF|ASN1_TFLG_OPTIONAL, 0, stname, field, type)
393
394/* Finally compound types of SEQUENCE, SET, IMPLICIT, EXPLICIT and OPTIONAL */
395
396#define ASN1_IMP_SET_OF(stname, field, type, tag) \
397 ASN1_IMP_EX(stname, field, type, tag, ASN1_TFLG_SET_OF)
398
399#define ASN1_EXP_SET_OF(stname, field, type, tag) \
400 ASN1_EXP_EX(stname, field, type, tag, ASN1_TFLG_SET_OF)
401
402#define ASN1_IMP_SET_OF_OPT(stname, field, type, tag) \
403 ASN1_IMP_EX(stname, field, type, tag, ASN1_TFLG_SET_OF|ASN1_TFLG_OPTIONAL)
404
405#define ASN1_EXP_SET_OF_OPT(stname, field, type, tag) \
406 ASN1_EXP_EX(stname, field, type, tag, ASN1_TFLG_SET_OF|ASN1_TFLG_OPTIONAL)
407
408#define ASN1_IMP_SEQUENCE_OF(stname, field, type, tag) \
409 ASN1_IMP_EX(stname, field, type, tag, ASN1_TFLG_SEQUENCE_OF)
410
411#define ASN1_IMP_SEQUENCE_OF_OPT(stname, field, type, tag) \
412 ASN1_IMP_EX(stname, field, type, tag, ASN1_TFLG_SEQUENCE_OF|ASN1_TFLG_OPTIONAL)
413
414#define ASN1_EXP_SEQUENCE_OF(stname, field, type, tag) \
415 ASN1_EXP_EX(stname, field, type, tag, ASN1_TFLG_SEQUENCE_OF)
416
417#define ASN1_EXP_SEQUENCE_OF_OPT(stname, field, type, tag) \
418 ASN1_EXP_EX(stname, field, type, tag, ASN1_TFLG_SEQUENCE_OF|ASN1_TFLG_OPTIONAL)
419
420/* EXPLICIT using indefinite length constructed form */
421#define ASN1_NDEF_EXP(stname, field, type, tag) \
422 ASN1_EXP_EX(stname, field, type, tag, ASN1_TFLG_NDEF)
423
424/* EXPLICIT OPTIONAL using indefinite length constructed form */
425#define ASN1_NDEF_EXP_OPT(stname, field, type, tag) \
426 ASN1_EXP_EX(stname, field, type, tag, ASN1_TFLG_OPTIONAL|ASN1_TFLG_NDEF)
427
428/* Macros for the ASN1_ADB structure */
429
430#define ASN1_ADB(name) \
431 static const ASN1_ADB_TABLE name##_adbtbl[]
432
433
434#define ASN1_ADB_END(name, flags, field, app_table, def, none) \
435 ;\
436 static const ASN1_ADB name##_adb = {\
437 flags,\
438 offsetof(name, field),\
439 app_table,\
440 name##_adbtbl,\
441 sizeof(name##_adbtbl) / sizeof(ASN1_ADB_TABLE),\
442 def,\
443 none\
444 }
445
446
447#define ADB_ENTRY(val, template) {val, template}
448
449#define ASN1_ADB_TEMPLATE(name) \
450 static const ASN1_TEMPLATE name##_tt
451
452#endif /* !LIBRESSL_INTERNAL */
453
454/* This is the ASN1 template structure that defines
455 * a wrapper round the actual type. It determines the
456 * actual position of the field in the value structure,
457 * various flags such as OPTIONAL and the field name.
458 */
459
460struct ASN1_TEMPLATE_st {
461 unsigned long flags; /* Various flags */
462 long tag; /* tag, not used if no tagging */
463 unsigned long offset; /* Offset of this field in structure */
464 const char *field_name; /* Field name */
465 ASN1_ITEM_EXP *item; /* Relevant ASN1_ITEM or ASN1_ADB */
466};
467
468/* Macro to extract ASN1_ITEM and ASN1_ADB pointer from ASN1_TEMPLATE */
469
470#define ASN1_TEMPLATE_item(t) (t->item_ptr)
471#define ASN1_TEMPLATE_adb(t) (t->item_ptr)
472
473typedef struct ASN1_ADB_TABLE_st ASN1_ADB_TABLE;
474typedef struct ASN1_ADB_st ASN1_ADB;
475
476struct ASN1_ADB_st {
477 unsigned long flags; /* Various flags */
478 unsigned long offset; /* Offset of selector field */
479 const ASN1_ADB_TABLE *tbl; /* Table of possible types */
480 long tblcount; /* Number of entries in tbl */
481 const ASN1_TEMPLATE *default_tt; /* Type to use if no match */
482 const ASN1_TEMPLATE *null_tt; /* Type to use if selector is NULL */
483};
484
485struct ASN1_ADB_TABLE_st {
486 long value; /* NID for an object or value for an int */
487 const ASN1_TEMPLATE tt; /* item for this value */
488};
489
490/* template flags */
491
492/* Field is optional */
493#define ASN1_TFLG_OPTIONAL (0x1)
494
495/* Field is a SET OF */
496#define ASN1_TFLG_SET_OF (0x1 << 1)
497
498/* Field is a SEQUENCE OF */
499#define ASN1_TFLG_SEQUENCE_OF (0x2 << 1)
500
501/* Special case: this refers to a SET OF that
502 * will be sorted into DER order when encoded *and*
503 * the corresponding STACK will be modified to match
504 * the new order.
505 */
506#define ASN1_TFLG_SET_ORDER (0x3 << 1)
507
508/* Mask for SET OF or SEQUENCE OF */
509#define ASN1_TFLG_SK_MASK (0x3 << 1)
510
511/* These flags mean the tag should be taken from the
512 * tag field. If EXPLICIT then the underlying type
513 * is used for the inner tag.
514 */
515
516/* IMPLICIT tagging */
517#define ASN1_TFLG_IMPTAG (0x1 << 3)
518
519
520/* EXPLICIT tagging, inner tag from underlying type */
521#define ASN1_TFLG_EXPTAG (0x2 << 3)
522
523#define ASN1_TFLG_TAG_MASK (0x3 << 3)
524
525/* context specific IMPLICIT */
526#define ASN1_TFLG_IMPLICIT ASN1_TFLG_IMPTAG|ASN1_TFLG_CONTEXT
527
528/* context specific EXPLICIT */
529#define ASN1_TFLG_EXPLICIT ASN1_TFLG_EXPTAG|ASN1_TFLG_CONTEXT
530
531/*
532 * If tagging is in force these determine the type of tag to use. Otherwiser
533 * the tag is determined by the underlying type. These values reflect the
534 * actual octet format.
535 */
536
537/* Universal tag */
538#define ASN1_TFLG_UNIVERSAL (0x0<<6)
539/* Application tag */
540#define ASN1_TFLG_APPLICATION (0x1<<6)
541/* Context specific tag */
542#define ASN1_TFLG_CONTEXT (0x2<<6)
543/* Private tag */
544#define ASN1_TFLG_PRIVATE (0x3<<6)
545
546#define ASN1_TFLG_TAG_CLASS (0x3<<6)
547
548/*
549 * These are for ANY DEFINED BY type. In this case
550 * the 'item' field points to an ASN1_ADB structure
551 * which contains a table of values to decode the
552 * relevant type
553 */
554
555#define ASN1_TFLG_ADB_MASK (0x3<<8)
556
557#define ASN1_TFLG_ADB_OID (0x1<<8)
558
559#define ASN1_TFLG_ADB_INT (0x1<<9)
560
561/*
562 * This flag when present in a SEQUENCE OF, SET OF
563 * or EXPLICIT causes indefinite length constructed
564 * encoding to be used if required.
565 */
566
567#define ASN1_TFLG_NDEF (0x1<<11)
568
569/* This is the actual ASN1 item itself */
570
571struct ASN1_ITEM_st {
572 char itype; /* The item type, primitive, SEQUENCE, CHOICE or extern */
573 long utype; /* underlying type */
574 const ASN1_TEMPLATE *templates; /* If SEQUENCE or CHOICE this contains the contents */
575 long tcount; /* Number of templates if SEQUENCE or CHOICE */
576 const void *funcs; /* functions that handle this type */
577 long size; /* Structure size (usually)*/
578 const char *sname; /* Structure name */
579};
580
581/* These are values for the itype field and
582 * determine how the type is interpreted.
583 *
584 * For PRIMITIVE types the underlying type
585 * determines the behaviour if items is NULL.
586 *
587 * Otherwise templates must contain a single
588 * template and the type is treated in the
589 * same way as the type specified in the template.
590 *
591 * For SEQUENCE types the templates field points
592 * to the members, the size field is the
593 * structure size.
594 *
595 * For CHOICE types the templates field points
596 * to each possible member (typically a union)
597 * and the 'size' field is the offset of the
598 * selector.
599 *
600 * The 'funcs' field is used for application
601 * specific functions.
602 *
603 * The EXTERN type uses a new style d2i/i2d.
604 * The new style should be used where possible
605 * because it avoids things like the d2i IMPLICIT
606 * hack.
607 *
608 * MSTRING is a multiple string type, it is used
609 * for a CHOICE of character strings where the
610 * actual strings all occupy an ASN1_STRING
611 * structure. In this case the 'utype' field
612 * has a special meaning, it is used as a mask
613 * of acceptable types using the B_ASN1 constants.
614 *
615 * NDEF_SEQUENCE is the same as SEQUENCE except
616 * that it will use indefinite length constructed
617 * encoding if requested.
618 *
619 */
620
621#define ASN1_ITYPE_PRIMITIVE 0x0
622
623#define ASN1_ITYPE_SEQUENCE 0x1
624
625#define ASN1_ITYPE_CHOICE 0x2
626
627#define ASN1_ITYPE_EXTERN 0x4
628
629#define ASN1_ITYPE_MSTRING 0x5
630
631#define ASN1_ITYPE_NDEF_SEQUENCE 0x6
632
633/* Cache for ASN1 tag and length, so we
634 * don't keep re-reading it for things
635 * like CHOICE
636 */
637
638struct ASN1_TLC_st {
639 char valid; /* Values below are valid */
640 int ret; /* return value */
641 long plen; /* length */
642 int ptag; /* class value */
643 int pclass; /* class value */
644 int hdrlen; /* header length */
645};
646
647/* Typedefs for ASN1 function pointers */
648
649typedef ASN1_VALUE * ASN1_new_func(void);
650typedef void ASN1_free_func(ASN1_VALUE *a);
651typedef ASN1_VALUE * ASN1_d2i_func(ASN1_VALUE **a, const unsigned char ** in, long length);
652typedef int ASN1_i2d_func(ASN1_VALUE * a, unsigned char **in);
653
654typedef int ASN1_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len, const ASN1_ITEM *it,
655 int tag, int aclass, char opt, ASN1_TLC *ctx);
656
657typedef int ASN1_ex_i2d(ASN1_VALUE **pval, unsigned char **out, const ASN1_ITEM *it, int tag, int aclass);
658typedef int ASN1_ex_new_func(ASN1_VALUE **pval, const ASN1_ITEM *it);
659typedef void ASN1_ex_free_func(ASN1_VALUE **pval, const ASN1_ITEM *it);
660
661typedef int ASN1_ex_print_func(BIO *out, ASN1_VALUE **pval,
662 int indent, const char *fname,
663 const ASN1_PCTX *pctx);
664
665typedef int ASN1_primitive_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it);
666typedef int ASN1_primitive_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it);
667typedef int ASN1_primitive_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it, int indent, const ASN1_PCTX *pctx);
668
669typedef struct ASN1_EXTERN_FUNCS_st {
670 void *app_data;
671 ASN1_ex_new_func *asn1_ex_new;
672 ASN1_ex_free_func *asn1_ex_free;
673 ASN1_ex_free_func *asn1_ex_clear;
674 ASN1_ex_d2i *asn1_ex_d2i;
675 ASN1_ex_i2d *asn1_ex_i2d;
676 ASN1_ex_print_func *asn1_ex_print;
677} ASN1_EXTERN_FUNCS;
678
679typedef struct ASN1_PRIMITIVE_FUNCS_st {
680 void *app_data;
681 unsigned long flags;
682 ASN1_ex_new_func *prim_new;
683 ASN1_ex_free_func *prim_free;
684 ASN1_ex_free_func *prim_clear;
685 ASN1_primitive_c2i *prim_c2i;
686 ASN1_primitive_i2c *prim_i2c;
687 ASN1_primitive_print *prim_print;
688} ASN1_PRIMITIVE_FUNCS;
689
690/* This is the ASN1_AUX structure: it handles various
691 * miscellaneous requirements. For example the use of
692 * reference counts and an informational callback.
693 *
694 * The "informational callback" is called at various
695 * points during the ASN1 encoding and decoding. It can
696 * be used to provide minor customisation of the structures
697 * used. This is most useful where the supplied routines
698 * *almost* do the right thing but need some extra help
699 * at a few points. If the callback returns zero then
700 * it is assumed a fatal error has occurred and the
701 * main operation should be abandoned.
702 *
703 * If major changes in the default behaviour are required
704 * then an external type is more appropriate.
705 */
706
707typedef int ASN1_aux_cb(int operation, ASN1_VALUE **in, const ASN1_ITEM *it,
708 void *exarg);
709
710typedef struct ASN1_AUX_st {
711 void *app_data;
712 int flags;
713 int ref_offset; /* Offset of reference value */
714 int ref_lock; /* Lock type to use */
715 ASN1_aux_cb *asn1_cb;
716 int enc_offset; /* Offset of ASN1_ENCODING structure */
717} ASN1_AUX;
718
719/* For print related callbacks exarg points to this structure */
720typedef struct ASN1_PRINT_ARG_st {
721 BIO *out;
722 int indent;
723 const ASN1_PCTX *pctx;
724} ASN1_PRINT_ARG;
725
726/* For streaming related callbacks exarg points to this structure */
727typedef struct ASN1_STREAM_ARG_st {
728 /* BIO to stream through */
729 BIO *out;
730 /* BIO with filters appended */
731 BIO *ndef_bio;
732 /* Streaming I/O boundary */
733 unsigned char **boundary;
734} ASN1_STREAM_ARG;
735
736/* Flags in ASN1_AUX */
737
738/* Use a reference count */
739#define ASN1_AFLG_REFCOUNT 1
740/* Save the encoding of structure (useful for signatures) */
741#define ASN1_AFLG_ENCODING 2
742
743/* operation values for asn1_cb */
744
745#define ASN1_OP_NEW_PRE 0
746#define ASN1_OP_NEW_POST 1
747#define ASN1_OP_FREE_PRE 2
748#define ASN1_OP_FREE_POST 3
749#define ASN1_OP_D2I_PRE 4
750#define ASN1_OP_D2I_POST 5
751#define ASN1_OP_I2D_PRE 6
752#define ASN1_OP_I2D_POST 7
753#define ASN1_OP_PRINT_PRE 8
754#define ASN1_OP_PRINT_POST 9
755#define ASN1_OP_STREAM_PRE 10
756#define ASN1_OP_STREAM_POST 11
757#define ASN1_OP_DETACHED_PRE 12
758#define ASN1_OP_DETACHED_POST 13
759
760#ifndef LIBRESSL_INTERNAL
761
762/* Macro to implement a primitive type */
763#define IMPLEMENT_ASN1_TYPE(stname) IMPLEMENT_ASN1_TYPE_ex(stname, stname, 0)
764#define IMPLEMENT_ASN1_TYPE_ex(itname, vname, ex) \
765 ASN1_ITEM_start(itname) \
766 ASN1_ITYPE_PRIMITIVE, V_##vname, NULL, 0, NULL, ex, #itname \
767 ASN1_ITEM_end(itname)
768
769/* Macro to implement a multi string type */
770#define IMPLEMENT_ASN1_MSTRING(itname, mask) \
771 ASN1_ITEM_start(itname) \
772 ASN1_ITYPE_MSTRING, mask, NULL, 0, NULL, sizeof(ASN1_STRING), #itname \
773 ASN1_ITEM_end(itname)
774#define IMPLEMENT_EXTERN_ASN1(sname, tag, fptrs) \
775 ASN1_ITEM_start(sname) \
776 ASN1_ITYPE_EXTERN, \
777 tag, \
778 NULL, \
779 0, \
780 &fptrs, \
781 0, \
782 #sname \
783 ASN1_ITEM_end(sname)
784
785/* Macro to implement standard functions in terms of ASN1_ITEM structures */
786
787#define IMPLEMENT_ASN1_FUNCTIONS(stname) IMPLEMENT_ASN1_FUNCTIONS_fname(stname, stname, stname)
788
789#define IMPLEMENT_ASN1_FUNCTIONS_name(stname, itname) IMPLEMENT_ASN1_FUNCTIONS_fname(stname, itname, itname)
790
791#define IMPLEMENT_ASN1_FUNCTIONS_ENCODE_name(stname, itname) \
792 IMPLEMENT_ASN1_FUNCTIONS_ENCODE_fname(stname, itname, itname)
793
794#define IMPLEMENT_STATIC_ASN1_ALLOC_FUNCTIONS(stname) \
795 IMPLEMENT_ASN1_ALLOC_FUNCTIONS_pfname(static, stname, stname, stname)
796
797#define IMPLEMENT_ASN1_ALLOC_FUNCTIONS(stname) \
798 IMPLEMENT_ASN1_ALLOC_FUNCTIONS_fname(stname, stname, stname)
799
800#define IMPLEMENT_ASN1_ALLOC_FUNCTIONS_pfname(pre, stname, itname, fname) \
801 pre stname *fname##_new(void) \
802 { \
803 return (stname *)ASN1_item_new(ASN1_ITEM_rptr(itname)); \
804 } \
805 pre void fname##_free(stname *a) \
806 { \
807 ASN1_item_free((ASN1_VALUE *)a, ASN1_ITEM_rptr(itname)); \
808 }
809
810#define IMPLEMENT_ASN1_ALLOC_FUNCTIONS_fname(stname, itname, fname) \
811 stname *fname##_new(void) \
812 { \
813 return (stname *)ASN1_item_new(ASN1_ITEM_rptr(itname)); \
814 } \
815 void fname##_free(stname *a) \
816 { \
817 ASN1_item_free((ASN1_VALUE *)a, ASN1_ITEM_rptr(itname)); \
818 }
819
820#define IMPLEMENT_ASN1_FUNCTIONS_fname(stname, itname, fname) \
821 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_fname(stname, itname, fname) \
822 IMPLEMENT_ASN1_ALLOC_FUNCTIONS_fname(stname, itname, fname)
823
824#define IMPLEMENT_ASN1_ENCODE_FUNCTIONS_fname(stname, itname, fname) \
825 stname *d2i_##fname(stname **a, const unsigned char **in, long len) \
826 { \
827 return (stname *)ASN1_item_d2i((ASN1_VALUE **)a, in, len, ASN1_ITEM_rptr(itname));\
828 } \
829 int i2d_##fname(stname *a, unsigned char **out) \
830 { \
831 return ASN1_item_i2d((ASN1_VALUE *)a, out, ASN1_ITEM_rptr(itname));\
832 }
833
834#define IMPLEMENT_ASN1_NDEF_FUNCTION(stname) \
835 int i2d_##stname##_NDEF(stname *a, unsigned char **out) \
836 { \
837 return ASN1_item_ndef_i2d((ASN1_VALUE *)a, out, ASN1_ITEM_rptr(stname));\
838 }
839
840/* This includes evil casts to remove const: they will go away when full
841 * ASN1 constification is done.
842 */
843#define IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(stname, itname, fname) \
844 stname *d2i_##fname(stname **a, const unsigned char **in, long len) \
845 { \
846 return (stname *)ASN1_item_d2i((ASN1_VALUE **)a, in, len, ASN1_ITEM_rptr(itname));\
847 } \
848 int i2d_##fname(const stname *a, unsigned char **out) \
849 { \
850 return ASN1_item_i2d((ASN1_VALUE *)a, out, ASN1_ITEM_rptr(itname));\
851 }
852
853#define IMPLEMENT_ASN1_DUP_FUNCTION(stname) \
854 stname * stname##_dup(stname *x) \
855 { \
856 return ASN1_item_dup(ASN1_ITEM_rptr(stname), x); \
857 }
858
859#define IMPLEMENT_ASN1_PRINT_FUNCTION(stname) \
860 IMPLEMENT_ASN1_PRINT_FUNCTION_fname(stname, stname, stname)
861
862#define IMPLEMENT_ASN1_PRINT_FUNCTION_fname(stname, itname, fname) \
863 int fname##_print_ctx(BIO *out, stname *x, int indent, \
864 const ASN1_PCTX *pctx) \
865 { \
866 return ASN1_item_print(out, (ASN1_VALUE *)x, indent, \
867 ASN1_ITEM_rptr(itname), pctx); \
868 }
869
870#define IMPLEMENT_ASN1_FUNCTIONS_const(name) \
871 IMPLEMENT_ASN1_FUNCTIONS_const_fname(name, name, name)
872
873#define IMPLEMENT_ASN1_FUNCTIONS_const_fname(stname, itname, fname) \
874 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(stname, itname, fname) \
875 IMPLEMENT_ASN1_ALLOC_FUNCTIONS_fname(stname, itname, fname)
876
877#endif /* !LIBRESSL_INTERNAL */
878
879/* external definitions for primitive types */
880
881extern const ASN1_ITEM ASN1_BOOLEAN_it;
882extern const ASN1_ITEM ASN1_TBOOLEAN_it;
883extern const ASN1_ITEM ASN1_FBOOLEAN_it;
884extern const ASN1_ITEM ASN1_SEQUENCE_it;
885extern const ASN1_ITEM BIGNUM_it;
886extern const ASN1_ITEM LONG_it;
887extern const ASN1_ITEM ZLONG_it;
888extern const ASN1_ITEM CBIGNUM_it;
889
890DECLARE_STACK_OF(ASN1_VALUE)
891
892/* Functions used internally by the ASN1 code */
893
894int ASN1_item_ex_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
895void ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it);
896int ASN1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len, const ASN1_ITEM *it,
897 int tag, int aclass, char opt, ASN1_TLC *ctx);
898
899int ASN1_item_ex_i2d(ASN1_VALUE **pval, unsigned char **out, const ASN1_ITEM *it, int tag, int aclass);
900
901#ifdef __cplusplus
902}
903#endif
904#endif
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