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9d6b1ce6 | 1 | /* tasn_enc.c */ |
10621efd MC |
2 | /* |
3 | * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project | |
4 | * 2000. | |
9d6b1ce6 DSH |
5 | */ |
6 | /* ==================================================================== | |
8845420f | 7 | * Copyright (c) 2000-2004 The OpenSSL Project. All rights reserved. |
9d6b1ce6 DSH |
8 | * |
9 | * Redistribution and use in source and binary forms, with or without | |
10 | * modification, are permitted provided that the following conditions | |
11 | * are met: | |
12 | * | |
13 | * 1. Redistributions of source code must retain the above copyright | |
10621efd | 14 | * notice, this list of conditions and the following disclaimer. |
9d6b1ce6 DSH |
15 | * |
16 | * 2. Redistributions in binary form must reproduce the above copyright | |
17 | * notice, this list of conditions and the following disclaimer in | |
18 | * the documentation and/or other materials provided with the | |
19 | * distribution. | |
20 | * | |
21 | * 3. All advertising materials mentioning features or use of this | |
22 | * software must display the following acknowledgment: | |
23 | * "This product includes software developed by the OpenSSL Project | |
24 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" | |
25 | * | |
26 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
27 | * endorse or promote products derived from this software without | |
28 | * prior written permission. For written permission, please contact | |
29 | * licensing@OpenSSL.org. | |
30 | * | |
31 | * 5. Products derived from this software may not be called "OpenSSL" | |
32 | * nor may "OpenSSL" appear in their names without prior written | |
33 | * permission of the OpenSSL Project. | |
34 | * | |
35 | * 6. Redistributions of any form whatsoever must retain the following | |
36 | * acknowledgment: | |
37 | * "This product includes software developed by the OpenSSL Project | |
38 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" | |
39 | * | |
40 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
41 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
43 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
44 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
45 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
46 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
47 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
49 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
50 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
51 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
52 | * ==================================================================== | |
53 | * | |
54 | * This product includes cryptographic software written by Eric Young | |
55 | * (eay@cryptsoft.com). This product includes software written by Tim | |
56 | * Hudson (tjh@cryptsoft.com). | |
57 | * | |
58 | */ | |
59 | ||
9d6b1ce6 | 60 | #include <stddef.h> |
d8770f3e | 61 | #include <string.h> |
7a06050c | 62 | #include "cryptlib.h" |
9d6b1ce6 DSH |
63 | #include <openssl/asn1.h> |
64 | #include <openssl/asn1t.h> | |
65 | #include <openssl/objects.h> | |
66 | ||
230fd6b7 | 67 | static int asn1_i2d_ex_primitive(ASN1_VALUE **pval, unsigned char **out, |
10621efd | 68 | const ASN1_ITEM *it, int tag, int aclass); |
230fd6b7 | 69 | static int asn1_set_seq_out(STACK_OF(ASN1_VALUE) *sk, unsigned char **out, |
10621efd MC |
70 | int skcontlen, const ASN1_ITEM *item, |
71 | int do_sort, int iclass); | |
230fd6b7 | 72 | static int asn1_template_ex_i2d(ASN1_VALUE **pval, unsigned char **out, |
10621efd | 73 | const ASN1_TEMPLATE *tt, int tag, int aclass); |
230fd6b7 | 74 | static int asn1_item_flags_i2d(ASN1_VALUE *val, unsigned char **out, |
10621efd | 75 | const ASN1_ITEM *it, int flags); |
230fd6b7 | 76 | |
10621efd MC |
77 | /* |
78 | * Top level i2d equivalents: the 'ndef' variant instructs the encoder to use | |
79 | * indefinite length constructed encoding, where appropriate | |
230fd6b7 DSH |
80 | */ |
81 | ||
8845420f | 82 | int ASN1_item_ndef_i2d(ASN1_VALUE *val, unsigned char **out, |
10621efd MC |
83 | const ASN1_ITEM *it) |
84 | { | |
85 | return asn1_item_flags_i2d(val, out, it, ASN1_TFLG_NDEF); | |
86 | } | |
9d6b1ce6 | 87 | |
230fd6b7 | 88 | int ASN1_item_i2d(ASN1_VALUE *val, unsigned char **out, const ASN1_ITEM *it) |
10621efd MC |
89 | { |
90 | return asn1_item_flags_i2d(val, out, it, 0); | |
91 | } | |
230fd6b7 | 92 | |
10621efd MC |
93 | /* |
94 | * Encode an ASN1 item, this is use by the standard 'i2d' function. 'out' | |
95 | * points to a buffer to output the data to. The new i2d has one additional | |
96 | * feature. If the output buffer is NULL (i.e. *out == NULL) then a buffer is | |
9d6b1ce6 DSH |
97 | * allocated and populated with the encoding. |
98 | */ | |
99 | ||
8845420f | 100 | static int asn1_item_flags_i2d(ASN1_VALUE *val, unsigned char **out, |
10621efd MC |
101 | const ASN1_ITEM *it, int flags) |
102 | { | |
103 | if (out && !*out) { | |
104 | unsigned char *p, *buf; | |
105 | int len; | |
106 | len = ASN1_item_ex_i2d(&val, NULL, it, -1, flags); | |
107 | if (len <= 0) | |
108 | return len; | |
109 | buf = OPENSSL_malloc(len); | |
110 | if (!buf) | |
111 | return -1; | |
112 | p = buf; | |
113 | ASN1_item_ex_i2d(&val, &p, it, -1, flags); | |
114 | *out = buf; | |
115 | return len; | |
116 | } | |
117 | ||
118 | return ASN1_item_ex_i2d(&val, out, it, -1, flags); | |
119 | } | |
120 | ||
121 | /* | |
122 | * Encode an item, taking care of IMPLICIT tagging (if any). This function | |
123 | * performs the normal item handling: it can be used in external types. | |
9d6b1ce6 DSH |
124 | */ |
125 | ||
230fd6b7 | 126 | int ASN1_item_ex_i2d(ASN1_VALUE **pval, unsigned char **out, |
10621efd MC |
127 | const ASN1_ITEM *it, int tag, int aclass) |
128 | { | |
129 | const ASN1_TEMPLATE *tt = NULL; | |
130 | unsigned char *p = NULL; | |
131 | int i, seqcontlen, seqlen, ndef = 1; | |
132 | const ASN1_COMPAT_FUNCS *cf; | |
133 | const ASN1_EXTERN_FUNCS *ef; | |
134 | const ASN1_AUX *aux = it->funcs; | |
135 | ASN1_aux_cb *asn1_cb = 0; | |
136 | ||
137 | if ((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval) | |
138 | return 0; | |
139 | ||
140 | if (aux && aux->asn1_cb) | |
141 | asn1_cb = aux->asn1_cb; | |
142 | ||
143 | switch (it->itype) { | |
144 | ||
145 | case ASN1_ITYPE_PRIMITIVE: | |
146 | if (it->templates) | |
147 | return asn1_template_ex_i2d(pval, out, it->templates, | |
148 | tag, aclass); | |
149 | return asn1_i2d_ex_primitive(pval, out, it, tag, aclass); | |
150 | break; | |
151 | ||
152 | case ASN1_ITYPE_MSTRING: | |
153 | return asn1_i2d_ex_primitive(pval, out, it, -1, aclass); | |
154 | ||
155 | case ASN1_ITYPE_CHOICE: | |
156 | if (asn1_cb && !asn1_cb(ASN1_OP_I2D_PRE, pval, it, NULL)) | |
157 | return 0; | |
158 | i = asn1_get_choice_selector(pval, it); | |
159 | if ((i >= 0) && (i < it->tcount)) { | |
160 | ASN1_VALUE **pchval; | |
161 | const ASN1_TEMPLATE *chtt; | |
162 | chtt = it->templates + i; | |
163 | pchval = asn1_get_field_ptr(pval, chtt); | |
164 | return asn1_template_ex_i2d(pchval, out, chtt, -1, aclass); | |
165 | } | |
166 | /* Fixme: error condition if selector out of range */ | |
167 | if (asn1_cb && !asn1_cb(ASN1_OP_I2D_POST, pval, it, NULL)) | |
168 | return 0; | |
169 | break; | |
170 | ||
171 | case ASN1_ITYPE_EXTERN: | |
172 | /* If new style i2d it does all the work */ | |
173 | ef = it->funcs; | |
174 | return ef->asn1_ex_i2d(pval, out, it, tag, aclass); | |
175 | ||
176 | case ASN1_ITYPE_COMPAT: | |
177 | /* old style hackery... */ | |
178 | cf = it->funcs; | |
179 | if (out) | |
180 | p = *out; | |
181 | i = cf->asn1_i2d(*pval, out); | |
182 | /* | |
183 | * Fixup for IMPLICIT tag: note this messes up for tags > 30, but so | |
184 | * did the old code. Tags > 30 are very rare anyway. | |
185 | */ | |
186 | if (out && (tag != -1)) | |
187 | *p = aclass | tag | (*p & V_ASN1_CONSTRUCTED); | |
188 | return i; | |
189 | ||
190 | case ASN1_ITYPE_NDEF_SEQUENCE: | |
191 | /* Use indefinite length constructed if requested */ | |
192 | if (aclass & ASN1_TFLG_NDEF) | |
193 | ndef = 2; | |
194 | /* fall through */ | |
195 | ||
196 | case ASN1_ITYPE_SEQUENCE: | |
197 | i = asn1_enc_restore(&seqcontlen, out, pval, it); | |
198 | /* An error occurred */ | |
199 | if (i < 0) | |
200 | return 0; | |
201 | /* We have a valid cached encoding... */ | |
202 | if (i > 0) | |
203 | return seqcontlen; | |
204 | /* Otherwise carry on */ | |
205 | seqcontlen = 0; | |
206 | /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */ | |
207 | if (tag == -1) { | |
208 | tag = V_ASN1_SEQUENCE; | |
209 | /* Retain any other flags in aclass */ | |
210 | aclass = (aclass & ~ASN1_TFLG_TAG_CLASS) | |
211 | | V_ASN1_UNIVERSAL; | |
212 | } | |
213 | if (asn1_cb && !asn1_cb(ASN1_OP_I2D_PRE, pval, it, NULL)) | |
214 | return 0; | |
215 | /* First work out sequence content length */ | |
216 | for (i = 0, tt = it->templates; i < it->tcount; tt++, i++) { | |
217 | const ASN1_TEMPLATE *seqtt; | |
218 | ASN1_VALUE **pseqval; | |
219 | seqtt = asn1_do_adb(pval, tt, 1); | |
220 | if (!seqtt) | |
221 | return 0; | |
222 | pseqval = asn1_get_field_ptr(pval, seqtt); | |
223 | /* FIXME: check for errors in enhanced version */ | |
224 | seqcontlen += asn1_template_ex_i2d(pseqval, NULL, seqtt, | |
225 | -1, aclass); | |
226 | } | |
227 | ||
228 | seqlen = ASN1_object_size(ndef, seqcontlen, tag); | |
229 | if (!out) | |
230 | return seqlen; | |
231 | /* Output SEQUENCE header */ | |
232 | ASN1_put_object(out, ndef, seqcontlen, tag, aclass); | |
233 | for (i = 0, tt = it->templates; i < it->tcount; tt++, i++) { | |
234 | const ASN1_TEMPLATE *seqtt; | |
235 | ASN1_VALUE **pseqval; | |
236 | seqtt = asn1_do_adb(pval, tt, 1); | |
237 | if (!seqtt) | |
238 | return 0; | |
239 | pseqval = asn1_get_field_ptr(pval, seqtt); | |
240 | /* FIXME: check for errors in enhanced version */ | |
241 | asn1_template_ex_i2d(pseqval, out, seqtt, -1, aclass); | |
242 | } | |
243 | if (ndef == 2) | |
244 | ASN1_put_eoc(out); | |
245 | if (asn1_cb && !asn1_cb(ASN1_OP_I2D_POST, pval, it, NULL)) | |
246 | return 0; | |
247 | return seqlen; | |
248 | ||
249 | default: | |
250 | return 0; | |
251 | ||
252 | } | |
253 | return 0; | |
254 | } | |
9d6b1ce6 | 255 | |
8845420f | 256 | int ASN1_template_i2d(ASN1_VALUE **pval, unsigned char **out, |
10621efd MC |
257 | const ASN1_TEMPLATE *tt) |
258 | { | |
259 | return asn1_template_ex_i2d(pval, out, tt, -1, 0); | |
260 | } | |
12dadc55 | 261 | |
8845420f | 262 | static int asn1_template_ex_i2d(ASN1_VALUE **pval, unsigned char **out, |
10621efd MC |
263 | const ASN1_TEMPLATE *tt, int tag, int iclass) |
264 | { | |
265 | int i, ret, flags, ttag, tclass, ndef; | |
266 | flags = tt->flags; | |
267 | /* | |
268 | * Work out tag and class to use: tagging may come either from the | |
269 | * template or the arguments, not both because this would create | |
270 | * ambiguity. Additionally the iclass argument may contain some | |
271 | * additional flags which should be noted and passed down to other | |
272 | * levels. | |
273 | */ | |
274 | if (flags & ASN1_TFLG_TAG_MASK) { | |
275 | /* Error if argument and template tagging */ | |
276 | if (tag != -1) | |
277 | /* FIXME: error code here */ | |
278 | return -1; | |
279 | /* Get tagging from template */ | |
280 | ttag = tt->tag; | |
281 | tclass = flags & ASN1_TFLG_TAG_CLASS; | |
282 | } else if (tag != -1) { | |
283 | /* No template tagging, get from arguments */ | |
284 | ttag = tag; | |
285 | tclass = iclass & ASN1_TFLG_TAG_CLASS; | |
286 | } else { | |
287 | ttag = -1; | |
288 | tclass = 0; | |
289 | } | |
290 | /* | |
291 | * Remove any class mask from iflag. | |
292 | */ | |
293 | iclass &= ~ASN1_TFLG_TAG_CLASS; | |
294 | ||
295 | /* | |
296 | * At this point 'ttag' contains the outer tag to use, 'tclass' is the | |
297 | * class and iclass is any flags passed to this function. | |
298 | */ | |
299 | ||
300 | /* if template and arguments require ndef, use it */ | |
301 | if ((flags & ASN1_TFLG_NDEF) && (iclass & ASN1_TFLG_NDEF)) | |
302 | ndef = 2; | |
303 | else | |
304 | ndef = 1; | |
305 | ||
306 | if (flags & ASN1_TFLG_SK_MASK) { | |
307 | /* SET OF, SEQUENCE OF */ | |
308 | STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval; | |
309 | int isset, sktag, skaclass; | |
310 | int skcontlen, sklen; | |
311 | ASN1_VALUE *skitem; | |
312 | ||
313 | if (!*pval) | |
314 | return 0; | |
315 | ||
316 | if (flags & ASN1_TFLG_SET_OF) { | |
317 | isset = 1; | |
318 | /* 2 means we reorder */ | |
319 | if (flags & ASN1_TFLG_SEQUENCE_OF) | |
320 | isset = 2; | |
321 | } else | |
322 | isset = 0; | |
323 | ||
324 | /* | |
325 | * Work out inner tag value: if EXPLICIT or no tagging use underlying | |
326 | * type. | |
327 | */ | |
328 | if ((ttag != -1) && !(flags & ASN1_TFLG_EXPTAG)) { | |
329 | sktag = ttag; | |
330 | skaclass = tclass; | |
331 | } else { | |
332 | skaclass = V_ASN1_UNIVERSAL; | |
333 | if (isset) | |
334 | sktag = V_ASN1_SET; | |
335 | else | |
336 | sktag = V_ASN1_SEQUENCE; | |
337 | } | |
338 | ||
339 | /* Determine total length of items */ | |
340 | skcontlen = 0; | |
341 | for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) { | |
342 | skitem = sk_ASN1_VALUE_value(sk, i); | |
343 | skcontlen += ASN1_item_ex_i2d(&skitem, NULL, | |
344 | ASN1_ITEM_ptr(tt->item), | |
345 | -1, iclass); | |
346 | } | |
347 | sklen = ASN1_object_size(ndef, skcontlen, sktag); | |
348 | /* If EXPLICIT need length of surrounding tag */ | |
349 | if (flags & ASN1_TFLG_EXPTAG) | |
350 | ret = ASN1_object_size(ndef, sklen, ttag); | |
351 | else | |
352 | ret = sklen; | |
353 | ||
354 | if (!out) | |
355 | return ret; | |
356 | ||
357 | /* Now encode this lot... */ | |
358 | /* EXPLICIT tag */ | |
359 | if (flags & ASN1_TFLG_EXPTAG) | |
360 | ASN1_put_object(out, ndef, sklen, ttag, tclass); | |
361 | /* SET or SEQUENCE and IMPLICIT tag */ | |
362 | ASN1_put_object(out, ndef, skcontlen, sktag, skaclass); | |
363 | /* And the stuff itself */ | |
364 | asn1_set_seq_out(sk, out, skcontlen, ASN1_ITEM_ptr(tt->item), | |
365 | isset, iclass); | |
366 | if (ndef == 2) { | |
367 | ASN1_put_eoc(out); | |
368 | if (flags & ASN1_TFLG_EXPTAG) | |
369 | ASN1_put_eoc(out); | |
370 | } | |
371 | ||
372 | return ret; | |
373 | } | |
374 | ||
375 | if (flags & ASN1_TFLG_EXPTAG) { | |
376 | /* EXPLICIT tagging */ | |
377 | /* Find length of tagged item */ | |
378 | i = ASN1_item_ex_i2d(pval, NULL, ASN1_ITEM_ptr(tt->item), -1, iclass); | |
379 | if (!i) | |
380 | return 0; | |
381 | /* Find length of EXPLICIT tag */ | |
382 | ret = ASN1_object_size(ndef, i, ttag); | |
383 | if (out) { | |
384 | /* Output tag and item */ | |
385 | ASN1_put_object(out, ndef, i, ttag, tclass); | |
386 | ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item), -1, iclass); | |
387 | if (ndef == 2) | |
388 | ASN1_put_eoc(out); | |
389 | } | |
390 | return ret; | |
391 | } | |
392 | ||
393 | /* Either normal or IMPLICIT tagging: combine class and flags */ | |
394 | return ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item), | |
395 | ttag, tclass | iclass); | |
230fd6b7 | 396 | |
9d6b1ce6 DSH |
397 | } |
398 | ||
399 | /* Temporary structure used to hold DER encoding of items for SET OF */ | |
400 | ||
10621efd MC |
401 | typedef struct { |
402 | unsigned char *data; | |
403 | int length; | |
404 | ASN1_VALUE *field; | |
9d6b1ce6 DSH |
405 | } DER_ENC; |
406 | ||
407 | static int der_cmp(const void *a, const void *b) | |
10621efd MC |
408 | { |
409 | const DER_ENC *d1 = a, *d2 = b; | |
410 | int cmplen, i; | |
411 | cmplen = (d1->length < d2->length) ? d1->length : d2->length; | |
412 | i = memcmp(d1->data, d2->data, cmplen); | |
413 | if (i) | |
414 | return i; | |
415 | return d1->length - d2->length; | |
416 | } | |
9d6b1ce6 DSH |
417 | |
418 | /* Output the content octets of SET OF or SEQUENCE OF */ | |
419 | ||
230fd6b7 | 420 | static int asn1_set_seq_out(STACK_OF(ASN1_VALUE) *sk, unsigned char **out, |
10621efd MC |
421 | int skcontlen, const ASN1_ITEM *item, |
422 | int do_sort, int iclass) | |
423 | { | |
424 | int i; | |
425 | ASN1_VALUE *skitem; | |
426 | unsigned char *tmpdat = NULL, *p = NULL; | |
427 | DER_ENC *derlst = NULL, *tder; | |
428 | if (do_sort) { | |
429 | /* Don't need to sort less than 2 items */ | |
430 | if (sk_ASN1_VALUE_num(sk) < 2) | |
431 | do_sort = 0; | |
432 | else { | |
433 | derlst = OPENSSL_malloc(sk_ASN1_VALUE_num(sk) | |
434 | * sizeof(*derlst)); | |
435 | if (!derlst) | |
436 | return 0; | |
437 | tmpdat = OPENSSL_malloc(skcontlen); | |
438 | if (!tmpdat) { | |
439 | OPENSSL_free(derlst); | |
440 | return 0; | |
441 | } | |
442 | } | |
443 | } | |
444 | /* If not sorting just output each item */ | |
445 | if (!do_sort) { | |
446 | for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) { | |
447 | skitem = sk_ASN1_VALUE_value(sk, i); | |
448 | ASN1_item_ex_i2d(&skitem, out, item, -1, iclass); | |
449 | } | |
450 | return 1; | |
451 | } | |
452 | p = tmpdat; | |
453 | ||
454 | /* Doing sort: build up a list of each member's DER encoding */ | |
455 | for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++) { | |
456 | skitem = sk_ASN1_VALUE_value(sk, i); | |
457 | tder->data = p; | |
458 | tder->length = ASN1_item_ex_i2d(&skitem, &p, item, -1, iclass); | |
459 | tder->field = skitem; | |
460 | } | |
461 | ||
462 | /* Now sort them */ | |
463 | qsort(derlst, sk_ASN1_VALUE_num(sk), sizeof(*derlst), der_cmp); | |
464 | /* Output sorted DER encoding */ | |
465 | p = *out; | |
466 | for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++) { | |
467 | memcpy(p, tder->data, tder->length); | |
468 | p += tder->length; | |
469 | } | |
470 | *out = p; | |
471 | /* If do_sort is 2 then reorder the STACK */ | |
472 | if (do_sort == 2) { | |
473 | for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++) | |
474 | (void)sk_ASN1_VALUE_set(sk, i, tder->field); | |
475 | } | |
476 | OPENSSL_free(derlst); | |
477 | OPENSSL_free(tmpdat); | |
478 | return 1; | |
479 | } | |
9d6b1ce6 | 480 | |
8845420f | 481 | static int asn1_i2d_ex_primitive(ASN1_VALUE **pval, unsigned char **out, |
10621efd MC |
482 | const ASN1_ITEM *it, int tag, int aclass) |
483 | { | |
484 | int len; | |
485 | int utype; | |
486 | int usetag; | |
487 | int ndef = 0; | |
488 | ||
489 | utype = it->utype; | |
490 | ||
491 | /* | |
492 | * Get length of content octets and maybe find out the underlying type. | |
493 | */ | |
494 | ||
495 | len = asn1_ex_i2c(pval, NULL, &utype, it); | |
496 | ||
497 | /* | |
498 | * If SEQUENCE, SET or OTHER then header is included in pseudo content | |
499 | * octets so don't include tag+length. We need to check here because the | |
500 | * call to asn1_ex_i2c() could change utype. | |
501 | */ | |
502 | if ((utype == V_ASN1_SEQUENCE) || (utype == V_ASN1_SET) || | |
503 | (utype == V_ASN1_OTHER)) | |
504 | usetag = 0; | |
505 | else | |
506 | usetag = 1; | |
507 | ||
508 | /* -1 means omit type */ | |
509 | ||
510 | if (len == -1) | |
511 | return 0; | |
512 | ||
513 | /* -2 return is special meaning use ndef */ | |
514 | if (len == -2) { | |
515 | ndef = 2; | |
516 | len = 0; | |
517 | } | |
518 | ||
519 | /* If not implicitly tagged get tag from underlying type */ | |
520 | if (tag == -1) | |
521 | tag = utype; | |
522 | ||
523 | /* Output tag+length followed by content octets */ | |
524 | if (out) { | |
525 | if (usetag) | |
526 | ASN1_put_object(out, ndef, len, tag, aclass); | |
527 | asn1_ex_i2c(pval, *out, &utype, it); | |
528 | if (ndef) | |
529 | ASN1_put_eoc(out); | |
530 | else | |
531 | *out += len; | |
532 | } | |
533 | ||
534 | if (usetag) | |
535 | return ASN1_object_size(ndef, len, tag); | |
536 | return len; | |
537 | } | |
9d6b1ce6 DSH |
538 | |
539 | /* Produce content octets from a structure */ | |
540 | ||
8845420f | 541 | int asn1_ex_i2c(ASN1_VALUE **pval, unsigned char *cout, int *putype, |
10621efd MC |
542 | const ASN1_ITEM *it) |
543 | { | |
544 | ASN1_BOOLEAN *tbool = NULL; | |
545 | ASN1_STRING *strtmp; | |
546 | ASN1_OBJECT *otmp; | |
547 | int utype; | |
548 | const unsigned char *cont; | |
549 | unsigned char c; | |
550 | int len; | |
551 | const ASN1_PRIMITIVE_FUNCS *pf; | |
552 | pf = it->funcs; | |
553 | if (pf && pf->prim_i2c) | |
554 | return pf->prim_i2c(pval, cout, putype, it); | |
555 | ||
556 | /* Should type be omitted? */ | |
557 | if ((it->itype != ASN1_ITYPE_PRIMITIVE) | |
558 | || (it->utype != V_ASN1_BOOLEAN)) { | |
559 | if (!*pval) | |
560 | return -1; | |
561 | } | |
562 | ||
563 | if (it->itype == ASN1_ITYPE_MSTRING) { | |
564 | /* If MSTRING type set the underlying type */ | |
565 | strtmp = (ASN1_STRING *)*pval; | |
566 | utype = strtmp->type; | |
567 | *putype = utype; | |
568 | } else if (it->utype == V_ASN1_ANY) { | |
569 | /* If ANY set type and pointer to value */ | |
570 | ASN1_TYPE *typ; | |
571 | typ = (ASN1_TYPE *)*pval; | |
572 | utype = typ->type; | |
573 | *putype = utype; | |
574 | pval = &typ->value.asn1_value; | |
575 | } else | |
576 | utype = *putype; | |
577 | ||
578 | switch (utype) { | |
579 | case V_ASN1_OBJECT: | |
580 | otmp = (ASN1_OBJECT *)*pval; | |
581 | cont = otmp->data; | |
582 | len = otmp->length; | |
583 | break; | |
584 | ||
585 | case V_ASN1_NULL: | |
586 | cont = NULL; | |
587 | len = 0; | |
588 | break; | |
589 | ||
590 | case V_ASN1_BOOLEAN: | |
591 | tbool = (ASN1_BOOLEAN *)pval; | |
592 | if (*tbool == -1) | |
593 | return -1; | |
594 | if (it->utype != V_ASN1_ANY) { | |
595 | /* | |
596 | * Default handling if value == size field then omit | |
597 | */ | |
598 | if (*tbool && (it->size > 0)) | |
599 | return -1; | |
600 | if (!*tbool && !it->size) | |
601 | return -1; | |
602 | } | |
603 | c = (unsigned char)*tbool; | |
604 | cont = &c; | |
605 | len = 1; | |
606 | break; | |
607 | ||
608 | case V_ASN1_BIT_STRING: | |
609 | return i2c_ASN1_BIT_STRING((ASN1_BIT_STRING *)*pval, | |
610 | cout ? &cout : NULL); | |
611 | break; | |
612 | ||
613 | case V_ASN1_INTEGER: | |
10621efd | 614 | case V_ASN1_ENUMERATED: |
10621efd MC |
615 | /* |
616 | * These are all have the same content format as ASN1_INTEGER | |
617 | */ | |
618 | return i2c_ASN1_INTEGER((ASN1_INTEGER *)*pval, cout ? &cout : NULL); | |
619 | break; | |
620 | ||
621 | case V_ASN1_OCTET_STRING: | |
622 | case V_ASN1_NUMERICSTRING: | |
623 | case V_ASN1_PRINTABLESTRING: | |
624 | case V_ASN1_T61STRING: | |
625 | case V_ASN1_VIDEOTEXSTRING: | |
626 | case V_ASN1_IA5STRING: | |
627 | case V_ASN1_UTCTIME: | |
628 | case V_ASN1_GENERALIZEDTIME: | |
629 | case V_ASN1_GRAPHICSTRING: | |
630 | case V_ASN1_VISIBLESTRING: | |
631 | case V_ASN1_GENERALSTRING: | |
632 | case V_ASN1_UNIVERSALSTRING: | |
633 | case V_ASN1_BMPSTRING: | |
634 | case V_ASN1_UTF8STRING: | |
635 | case V_ASN1_SEQUENCE: | |
636 | case V_ASN1_SET: | |
637 | default: | |
638 | /* All based on ASN1_STRING and handled the same */ | |
639 | strtmp = (ASN1_STRING *)*pval; | |
640 | /* Special handling for NDEF */ | |
641 | if ((it->size == ASN1_TFLG_NDEF) | |
642 | && (strtmp->flags & ASN1_STRING_FLAG_NDEF)) { | |
643 | if (cout) { | |
644 | strtmp->data = cout; | |
645 | strtmp->length = 0; | |
646 | } | |
647 | /* Special return code */ | |
648 | return -2; | |
649 | } | |
650 | cont = strtmp->data; | |
651 | len = strtmp->length; | |
652 | ||
653 | break; | |
654 | ||
655 | } | |
656 | if (cout && len) | |
657 | memcpy(cout, cont, len); | |
658 | return len; | |
659 | } |