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diff --git a/src/lib/libcrypto/asn1/tasn_enc.c b/src/lib/libcrypto/asn1/tasn_enc.c
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1/* tasn_enc.c */
2/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
3 * project 2000.
4 */
5/* ====================================================================
6 * Copyright (c) 2000 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
66static int asn1_i2d_ex_primitive(ASN1_VALUE **pval, unsigned char **out, const ASN1_ITEM *it, int tag, int aclass);
67static int asn1_set_seq_out(STACK_OF(ASN1_VALUE) *seq, unsigned char **out, int skcontlen, const ASN1_ITEM *item, int isset);
68
69/* Encode an ASN1 item, this is compatible with the
70 * standard 'i2d' function. 'out' points to
71 * a buffer to output the data to, in future we will
72 * have more advanced versions that can output data
73 * a piece at a time and this will simply be a special
74 * case.
75 *
76 * The new i2d has one additional feature. If the output
77 * buffer is NULL (i.e. *out == NULL) then a buffer is
78 * allocated and populated with the encoding.
79 */
80
81
82int ASN1_item_i2d(ASN1_VALUE *val, unsigned char **out, const ASN1_ITEM *it)
83{
84 if(out && !*out) {
85 unsigned char *p, *buf;
86 int len;
87 len = ASN1_item_ex_i2d(&val, NULL, it, -1, 0);
88 if(len <= 0) return len;
89 buf = OPENSSL_malloc(len);
90 if(!buf) return -1;
91 p = buf;
92 ASN1_item_ex_i2d(&val, &p, it, -1, 0);
93 *out = buf;
94 return len;
95 }
96
97 return ASN1_item_ex_i2d(&val, out, it, -1, 0);
98}
99
100/* Encode an item, taking care of IMPLICIT tagging (if any).
101 * This function performs the normal item handling: it can be
102 * used in external types.
103 */
104
105int ASN1_item_ex_i2d(ASN1_VALUE **pval, unsigned char **out, const ASN1_ITEM *it, int tag, int aclass)
106{
107 const ASN1_TEMPLATE *tt = NULL;
108 unsigned char *p = NULL;
109 int i, seqcontlen, seqlen;
110 ASN1_STRING *strtmp;
111 const ASN1_COMPAT_FUNCS *cf;
112 const ASN1_EXTERN_FUNCS *ef;
113 const ASN1_AUX *aux = it->funcs;
114 ASN1_aux_cb *asn1_cb;
115 if((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval) return 0;
116 if(aux && aux->asn1_cb) asn1_cb = aux->asn1_cb;
117 else asn1_cb = 0;
118
119 switch(it->itype) {
120
121 case ASN1_ITYPE_PRIMITIVE:
122 if(it->templates)
123 return ASN1_template_i2d(pval, out, it->templates);
124 return asn1_i2d_ex_primitive(pval, out, it, tag, aclass);
125 break;
126
127 case ASN1_ITYPE_MSTRING:
128 strtmp = (ASN1_STRING *)*pval;
129 return asn1_i2d_ex_primitive(pval, out, it, -1, 0);
130
131 case ASN1_ITYPE_CHOICE:
132 if(asn1_cb && !asn1_cb(ASN1_OP_I2D_PRE, pval, it))
133 return 0;
134 i = asn1_get_choice_selector(pval, it);
135 if((i >= 0) && (i < it->tcount)) {
136 ASN1_VALUE **pchval;
137 const ASN1_TEMPLATE *chtt;
138 chtt = it->templates + i;
139 pchval = asn1_get_field_ptr(pval, chtt);
140 return ASN1_template_i2d(pchval, out, chtt);
141 }
142 /* Fixme: error condition if selector out of range */
143 if(asn1_cb && !asn1_cb(ASN1_OP_I2D_POST, pval, it))
144 return 0;
145 break;
146
147 case ASN1_ITYPE_EXTERN:
148 /* If new style i2d it does all the work */
149 ef = it->funcs;
150 return ef->asn1_ex_i2d(pval, out, it, tag, aclass);
151
152 case ASN1_ITYPE_COMPAT:
153 /* old style hackery... */
154 cf = it->funcs;
155 if(out) p = *out;
156 i = cf->asn1_i2d(*pval, out);
157 /* Fixup for IMPLICIT tag: note this messes up for tags > 30,
158 * but so did the old code. Tags > 30 are very rare anyway.
159 */
160 if(out && (tag != -1))
161 *p = aclass | tag | (*p & V_ASN1_CONSTRUCTED);
162 return i;
163
164 case ASN1_ITYPE_SEQUENCE:
165 i = asn1_enc_restore(&seqcontlen, out, pval, it);
166 /* An error occurred */
167 if(i < 0) return 0;
168 /* We have a valid cached encoding... */
169 if(i > 0) return seqcontlen;
170 /* Otherwise carry on */
171 seqcontlen = 0;
172 /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
173 if(tag == -1) {
174 tag = V_ASN1_SEQUENCE;
175 aclass = V_ASN1_UNIVERSAL;
176 }
177 if(asn1_cb && !asn1_cb(ASN1_OP_I2D_PRE, pval, it))
178 return 0;
179 /* First work out sequence content length */
180 for(i = 0, tt = it->templates; i < it->tcount; tt++, i++) {
181 const ASN1_TEMPLATE *seqtt;
182 ASN1_VALUE **pseqval;
183 seqtt = asn1_do_adb(pval, tt, 1);
184 if(!seqtt) return 0;
185 pseqval = asn1_get_field_ptr(pval, seqtt);
186 /* FIXME: check for errors in enhanced version */
187 /* FIXME: special handling of indefinite length encoding */
188 seqcontlen += ASN1_template_i2d(pseqval, NULL, seqtt);
189 }
190 seqlen = ASN1_object_size(1, seqcontlen, tag);
191 if(!out) return seqlen;
192 /* Output SEQUENCE header */
193 ASN1_put_object(out, 1, seqcontlen, tag, aclass);
194 for(i = 0, tt = it->templates; i < it->tcount; tt++, i++) {
195 const ASN1_TEMPLATE *seqtt;
196 ASN1_VALUE **pseqval;
197 seqtt = asn1_do_adb(pval, tt, 1);
198 if(!seqtt) return 0;
199 pseqval = asn1_get_field_ptr(pval, seqtt);
200 /* FIXME: check for errors in enhanced version */
201 ASN1_template_i2d(pseqval, out, seqtt);
202 }
203 if(asn1_cb && !asn1_cb(ASN1_OP_I2D_POST, pval, it))
204 return 0;
205 return seqlen;
206
207 default:
208 return 0;
209 }
210 return 0;
211}
212
213int ASN1_template_i2d(ASN1_VALUE **pval, unsigned char **out, const ASN1_TEMPLATE *tt)
214{
215 int i, ret, flags, aclass;
216 flags = tt->flags;
217 aclass = flags & ASN1_TFLG_TAG_CLASS;
218 if(flags & ASN1_TFLG_SK_MASK) {
219 /* SET OF, SEQUENCE OF */
220 STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
221 int isset, sktag, skaclass;
222 int skcontlen, sklen;
223 ASN1_VALUE *skitem;
224 if(!*pval) return 0;
225 if(flags & ASN1_TFLG_SET_OF) {
226 isset = 1;
227 /* 2 means we reorder */
228 if(flags & ASN1_TFLG_SEQUENCE_OF) isset = 2;
229 } else isset = 0;
230 /* First work out inner tag value */
231 if(flags & ASN1_TFLG_IMPTAG) {
232 sktag = tt->tag;
233 skaclass = aclass;
234 } else {
235 skaclass = V_ASN1_UNIVERSAL;
236 if(isset) sktag = V_ASN1_SET;
237 else sktag = V_ASN1_SEQUENCE;
238 }
239 /* Now work out length of items */
240 skcontlen = 0;
241 for(i = 0; i < sk_ASN1_VALUE_num(sk); i++) {
242 skitem = sk_ASN1_VALUE_value(sk, i);
243 skcontlen += ASN1_item_ex_i2d(&skitem, NULL, ASN1_ITEM_ptr(tt->item), -1, 0);
244 }
245 sklen = ASN1_object_size(1, skcontlen, sktag);
246 /* If EXPLICIT need length of surrounding tag */
247 if(flags & ASN1_TFLG_EXPTAG)
248 ret = ASN1_object_size(1, sklen, tt->tag);
249 else ret = sklen;
250
251 if(!out) return ret;
252
253 /* Now encode this lot... */
254 /* EXPLICIT tag */
255 if(flags & ASN1_TFLG_EXPTAG)
256 ASN1_put_object(out, 1, sklen, tt->tag, aclass);
257 /* SET or SEQUENCE and IMPLICIT tag */
258 ASN1_put_object(out, 1, skcontlen, sktag, skaclass);
259 /* And finally the stuff itself */
260 asn1_set_seq_out(sk, out, skcontlen, ASN1_ITEM_ptr(tt->item), isset);
261
262 return ret;
263 }
264
265 if(flags & ASN1_TFLG_EXPTAG) {
266 /* EXPLICIT tagging */
267 /* Find length of tagged item */
268 i = ASN1_item_ex_i2d(pval, NULL, ASN1_ITEM_ptr(tt->item), -1, 0);
269 if(!i) return 0;
270 /* Find length of EXPLICIT tag */
271 ret = ASN1_object_size(1, i, tt->tag);
272 if(out) {
273 /* Output tag and item */
274 ASN1_put_object(out, 1, i, tt->tag, aclass);
275 ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item), -1, 0);
276 }
277 return ret;
278 }
279 if(flags & ASN1_TFLG_IMPTAG) {
280 /* IMPLICIT tagging */
281 return ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item), tt->tag, aclass);
282 }
283 /* Nothing special: treat as normal */
284 return ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item), -1, 0);
285}
286
287/* Temporary structure used to hold DER encoding of items for SET OF */
288
289typedef struct {
290 unsigned char *data;
291 int length;
292 ASN1_VALUE *field;
293} DER_ENC;
294
295static int der_cmp(const void *a, const void *b)
296{
297 const DER_ENC *d1 = a, *d2 = b;
298 int cmplen, i;
299 cmplen = (d1->length < d2->length) ? d1->length : d2->length;
300 i = memcmp(d1->data, d2->data, cmplen);
301 if(i) return i;
302 return d1->length - d2->length;
303}
304
305/* Output the content octets of SET OF or SEQUENCE OF */
306
307static int asn1_set_seq_out(STACK_OF(ASN1_VALUE) *sk, unsigned char **out, int skcontlen, const ASN1_ITEM *item, int do_sort)
308{
309 int i;
310 ASN1_VALUE *skitem;
311 unsigned char *tmpdat = NULL, *p = NULL;
312 DER_ENC *derlst = NULL, *tder;
313 if(do_sort) {
314 /* Don't need to sort less than 2 items */
315 if(sk_ASN1_VALUE_num(sk) < 2) do_sort = 0;
316 else {
317 derlst = OPENSSL_malloc(sk_ASN1_VALUE_num(sk) * sizeof(*derlst));
318 tmpdat = OPENSSL_malloc(skcontlen);
319 if(!derlst || !tmpdat) return 0;
320 }
321 }
322 /* If not sorting just output each item */
323 if(!do_sort) {
324 for(i = 0; i < sk_ASN1_VALUE_num(sk); i++) {
325 skitem = sk_ASN1_VALUE_value(sk, i);
326 ASN1_item_i2d(skitem, out, item);
327 }
328 return 1;
329 }
330 p = tmpdat;
331 /* Doing sort: build up a list of each member's DER encoding */
332 for(i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++) {
333 skitem = sk_ASN1_VALUE_value(sk, i);
334 tder->data = p;
335 tder->length = ASN1_item_i2d(skitem, &p, item);
336 tder->field = skitem;
337 }
338 /* Now sort them */
339 qsort(derlst, sk_ASN1_VALUE_num(sk), sizeof(*derlst), der_cmp);
340 /* Output sorted DER encoding */
341 p = *out;
342 for(i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++) {
343 memcpy(p, tder->data, tder->length);
344 p += tder->length;
345 }
346 *out = p;
347 /* If do_sort is 2 then reorder the STACK */
348 if(do_sort == 2) {
349 for(i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++)
350 sk_ASN1_VALUE_set(sk, i, tder->field);
351 }
352 OPENSSL_free(derlst);
353 OPENSSL_free(tmpdat);
354 return 1;
355}
356
357static int asn1_i2d_ex_primitive(ASN1_VALUE **pval, unsigned char **out, const ASN1_ITEM *it, int tag, int aclass)
358{
359 int len;
360 int utype;
361 int usetag;
362
363 utype = it->utype;
364
365 /* Get length of content octets and maybe find
366 * out the underlying type.
367 */
368
369 len = asn1_ex_i2c(pval, NULL, &utype, it);
370
371 /* If SEQUENCE, SET or OTHER then header is
372 * included in pseudo content octets so don't
373 * include tag+length. We need to check here
374 * because the call to asn1_ex_i2c() could change
375 * utype.
376 */
377 if((utype == V_ASN1_SEQUENCE) || (utype == V_ASN1_SET) ||
378 (utype == V_ASN1_OTHER))
379 usetag = 0;
380 else usetag = 1;
381
382 /* -1 means omit type */
383
384 if(len == -1) return 0;
385
386 /* If not implicitly tagged get tag from underlying type */
387 if(tag == -1) tag = utype;
388
389 /* Output tag+length followed by content octets */
390 if(out) {
391 if(usetag) ASN1_put_object(out, 0, len, tag, aclass);
392 asn1_ex_i2c(pval, *out, &utype, it);
393 *out += len;
394 }
395
396 if(usetag) return ASN1_object_size(0, len, tag);
397 return len;
398}
399
400/* Produce content octets from a structure */
401
402int asn1_ex_i2c(ASN1_VALUE **pval, unsigned char *cout, int *putype, const ASN1_ITEM *it)
403{
404 ASN1_BOOLEAN *tbool = NULL;
405 ASN1_STRING *strtmp;
406 ASN1_OBJECT *otmp;
407 int utype;
408 unsigned char *cont, c;
409 int len;
410 const ASN1_PRIMITIVE_FUNCS *pf;
411 pf = it->funcs;
412 if(pf && pf->prim_i2c) return pf->prim_i2c(pval, cout, putype, it);
413
414 /* Should type be omitted? */
415 if((it->itype != ASN1_ITYPE_PRIMITIVE) || (it->utype != V_ASN1_BOOLEAN)) {
416 if(!*pval) return -1;
417 }
418
419 if(it->itype == ASN1_ITYPE_MSTRING) {
420 /* If MSTRING type set the underlying type */
421 strtmp = (ASN1_STRING *)*pval;
422 utype = strtmp->type;
423 *putype = utype;
424 } else if(it->utype == V_ASN1_ANY) {
425 /* If ANY set type and pointer to value */
426 ASN1_TYPE *typ;
427 typ = (ASN1_TYPE *)*pval;
428 utype = typ->type;
429 *putype = utype;
430 pval = (ASN1_VALUE **)&typ->value.ptr;
431 } else utype = *putype;
432
433 switch(utype) {
434 case V_ASN1_OBJECT:
435 otmp = (ASN1_OBJECT *)*pval;
436 cont = otmp->data;
437 len = otmp->length;
438 break;
439
440 case V_ASN1_NULL:
441 cont = NULL;
442 len = 0;
443 break;
444
445 case V_ASN1_BOOLEAN:
446 tbool = (ASN1_BOOLEAN *)pval;
447 if(*tbool == -1) return -1;
448 if (it->utype != V_ASN1_ANY)
449 {
450 /* Default handling if value == size field then omit */
451 if(*tbool && (it->size > 0)) return -1;
452 if(!*tbool && !it->size) return -1;
453 }
454 c = (unsigned char)*tbool;
455 cont = &c;
456 len = 1;
457 break;
458
459 case V_ASN1_BIT_STRING:
460 return i2c_ASN1_BIT_STRING((ASN1_BIT_STRING *)*pval, cout ? &cout : NULL);
461 break;
462
463 case V_ASN1_INTEGER:
464 case V_ASN1_NEG_INTEGER:
465 case V_ASN1_ENUMERATED:
466 case V_ASN1_NEG_ENUMERATED:
467 /* These are all have the same content format
468 * as ASN1_INTEGER
469 */
470 return i2c_ASN1_INTEGER((ASN1_INTEGER *)*pval, cout ? &cout : NULL);
471 break;
472
473 case V_ASN1_OCTET_STRING:
474 case V_ASN1_NUMERICSTRING:
475 case V_ASN1_PRINTABLESTRING:
476 case V_ASN1_T61STRING:
477 case V_ASN1_VIDEOTEXSTRING:
478 case V_ASN1_IA5STRING:
479 case V_ASN1_UTCTIME:
480 case V_ASN1_GENERALIZEDTIME:
481 case V_ASN1_GRAPHICSTRING:
482 case V_ASN1_VISIBLESTRING:
483 case V_ASN1_GENERALSTRING:
484 case V_ASN1_UNIVERSALSTRING:
485 case V_ASN1_BMPSTRING:
486 case V_ASN1_UTF8STRING:
487 case V_ASN1_SEQUENCE:
488 case V_ASN1_SET:
489 default:
490 /* All based on ASN1_STRING and handled the same */
491 strtmp = (ASN1_STRING *)*pval;
492 cont = strtmp->data;
493 len = strtmp->length;
494
495 break;
496
497 }
498 if(cout && len) memcpy(cout, cont, len);
499 return len;
500}
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