1 /* $OpenBSD: asn1_item.c,v 1.21 2024/04/09 13:55:02 beck Exp $ */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58 /* ====================================================================
59 * Copyright (c) 1998-2003 The OpenSSL Project. All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 *
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 *
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
82 *
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
105 *
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
109 *
110 */
111
112 #include <limits.h>
113
114 #include <openssl/buffer.h>
115 #include <openssl/err.h>
116 #include <openssl/evp.h>
117 #include <openssl/x509.h>
118
119 #include "asn1_local.h"
120 #include "evp_local.h"
121 #include "x509_local.h"
122
123 int
ASN1_item_digest(const ASN1_ITEM * it,const EVP_MD * type,void * asn,unsigned char * md,unsigned int * len)124 ASN1_item_digest(const ASN1_ITEM *it, const EVP_MD *type, void *asn,
125 unsigned char *md, unsigned int *len)
126 {
127 int i;
128 unsigned char *str = NULL;
129
130 i = ASN1_item_i2d(asn, &str, it);
131 if (!str)
132 return (0);
133
134 if (!EVP_Digest(str, i, md, len, type, NULL)) {
135 free(str);
136 return (0);
137 }
138
139 free(str);
140 return (1);
141 }
142 LCRYPTO_ALIAS(ASN1_item_digest);
143
144 /*
145 * ASN1_ITEM version of ASN1_dup(): follows the same model except there's no
146 * need to allocate the buffer. At some point this could be rewritten to dup
147 * the underlying structure directly instead of doing an encode and decode.
148 */
149
150 void *
ASN1_item_dup(const ASN1_ITEM * it,void * x)151 ASN1_item_dup(const ASN1_ITEM *it, void *x)
152 {
153 unsigned char *b = NULL;
154 const unsigned char *p;
155 long i;
156 void *ret;
157
158 if (x == NULL)
159 return (NULL);
160
161 i = ASN1_item_i2d(x, &b, it);
162 if (b == NULL) {
163 ASN1error(ERR_R_MALLOC_FAILURE);
164 return (NULL);
165 }
166 p = b;
167 ret = ASN1_item_d2i(NULL, &p, i, it);
168 free(b);
169 return (ret);
170 }
171 LCRYPTO_ALIAS(ASN1_item_dup);
172
173 /* Pack an ASN1 object into an ASN1_STRING. */
174 ASN1_STRING *
ASN1_item_pack(void * obj,const ASN1_ITEM * it,ASN1_STRING ** oct)175 ASN1_item_pack(void *obj, const ASN1_ITEM *it, ASN1_STRING **oct)
176 {
177 ASN1_STRING *octmp;
178
179 if (!oct || !*oct) {
180 if (!(octmp = ASN1_STRING_new ())) {
181 ASN1error(ERR_R_MALLOC_FAILURE);
182 return NULL;
183 }
184 } else
185 octmp = *oct;
186
187 free(octmp->data);
188 octmp->data = NULL;
189
190 if (!(octmp->length = ASN1_item_i2d(obj, &octmp->data, it))) {
191 ASN1error(ASN1_R_ENCODE_ERROR);
192 goto err;
193 }
194 if (!octmp->data) {
195 ASN1error(ERR_R_MALLOC_FAILURE);
196 goto err;
197 }
198 if (oct)
199 *oct = octmp;
200 return octmp;
201 err:
202 if (!oct || octmp != *oct)
203 ASN1_STRING_free(octmp);
204 return NULL;
205 }
206 LCRYPTO_ALIAS(ASN1_item_pack);
207
208 /* Extract an ASN1 object from an ASN1_STRING. */
209 void *
ASN1_item_unpack(const ASN1_STRING * oct,const ASN1_ITEM * it)210 ASN1_item_unpack(const ASN1_STRING *oct, const ASN1_ITEM *it)
211 {
212 const unsigned char *p;
213 void *ret;
214
215 p = oct->data;
216 if (!(ret = ASN1_item_d2i(NULL, &p, oct->length, it)))
217 ASN1error(ASN1_R_DECODE_ERROR);
218 return ret;
219 }
220 LCRYPTO_ALIAS(ASN1_item_unpack);
221
222 int
ASN1_item_sign(const ASN1_ITEM * it,X509_ALGOR * algor1,X509_ALGOR * algor2,ASN1_BIT_STRING * signature,void * asn,EVP_PKEY * pkey,const EVP_MD * type)223 ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1, X509_ALGOR *algor2,
224 ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey, const EVP_MD *type)
225 {
226 EVP_MD_CTX *md_ctx = NULL;
227 int ret = 0;
228
229 if ((md_ctx = EVP_MD_CTX_new()) == NULL)
230 goto err;
231 if (!EVP_DigestSignInit(md_ctx, NULL, type, NULL, pkey))
232 goto err;
233
234 ret = ASN1_item_sign_ctx(it, algor1, algor2, signature, asn, md_ctx);
235
236 err:
237 EVP_MD_CTX_free(md_ctx);
238
239 return ret;
240 }
241 LCRYPTO_ALIAS(ASN1_item_sign);
242
243 static int
asn1_item_set_algorithm_identifiers(EVP_MD_CTX * ctx,X509_ALGOR * algor1,X509_ALGOR * algor2)244 asn1_item_set_algorithm_identifiers(EVP_MD_CTX *ctx, X509_ALGOR *algor1,
245 X509_ALGOR *algor2)
246 {
247 EVP_PKEY *pkey;
248 const EVP_MD *md;
249 int sign_id, sign_param;
250
251 if ((pkey = EVP_PKEY_CTX_get0_pkey(ctx->pctx)) == NULL) {
252 ASN1error(ASN1_R_CONTEXT_NOT_INITIALISED);
253 return 0;
254 }
255
256 if ((md = EVP_MD_CTX_md(ctx)) == NULL) {
257 ASN1error(ASN1_R_CONTEXT_NOT_INITIALISED);
258 return 0;
259 }
260
261 if (!OBJ_find_sigid_by_algs(&sign_id, EVP_MD_nid(md),
262 pkey->ameth->pkey_id)) {
263 ASN1error(ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
264 return 0;
265 }
266
267 sign_param = V_ASN1_UNDEF;
268 if (pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL)
269 sign_param = V_ASN1_NULL;
270
271 if (algor1 != NULL) {
272 if (!X509_ALGOR_set0_by_nid(algor1, sign_id, sign_param, NULL))
273 return 0;
274 }
275 if (algor2 != NULL) {
276 if (!X509_ALGOR_set0_by_nid(algor2, sign_id, sign_param, NULL))
277 return 0;
278 }
279
280 return 1;
281 }
282
283 static int
asn1_item_sign(EVP_MD_CTX * ctx,const ASN1_ITEM * it,void * asn,ASN1_BIT_STRING * signature)284 asn1_item_sign(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
285 ASN1_BIT_STRING *signature)
286 {
287 unsigned char *in = NULL, *out = NULL;
288 size_t out_len = 0;
289 int in_len = 0;
290 int ret = 0;
291
292 if ((in_len = ASN1_item_i2d(asn, &in, it)) <= 0) {
293 in_len = 0;
294 goto err;
295 }
296
297 if (!EVP_DigestSign(ctx, NULL, &out_len, in, in_len)) {
298 ASN1error(ERR_R_EVP_LIB);
299 goto err;
300 }
301 if ((out = calloc(1, out_len)) == NULL) {
302 ASN1error(ERR_R_MALLOC_FAILURE);
303 goto err;
304 }
305 if (!EVP_DigestSign(ctx, out, &out_len, in, in_len)) {
306 ASN1error(ERR_R_EVP_LIB);
307 goto err;
308 }
309
310 if (out_len > INT_MAX) {
311 ASN1error(ASN1_R_TOO_LONG);
312 goto err;
313 }
314
315 ASN1_STRING_set0(signature, out, out_len);
316 out = NULL;
317
318 if (!asn1_abs_set_unused_bits(signature, 0)) {
319 ASN1_STRING_set0(signature, NULL, 0);
320 ASN1error(ERR_R_ASN1_LIB);
321 goto err;
322 }
323
324 ret = 1;
325
326 err:
327 freezero(in, in_len);
328 freezero(out, out_len);
329
330 return ret;
331 }
332
333 int
ASN1_item_sign_ctx(const ASN1_ITEM * it,X509_ALGOR * algor1,X509_ALGOR * algor2,ASN1_BIT_STRING * signature,void * asn,EVP_MD_CTX * ctx)334 ASN1_item_sign_ctx(const ASN1_ITEM *it, X509_ALGOR *algor1, X509_ALGOR *algor2,
335 ASN1_BIT_STRING *signature, void *asn, EVP_MD_CTX *ctx)
336 {
337 EVP_PKEY *pkey;
338 int rv;
339 int ret = 0;
340
341 if ((pkey = EVP_PKEY_CTX_get0_pkey(ctx->pctx)) == NULL) {
342 ASN1error(ASN1_R_CONTEXT_NOT_INITIALISED);
343 goto err;
344 }
345 if (pkey->ameth == NULL) {
346 ASN1error(ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
347 goto err;
348 }
349
350 /*
351 * API insanity ahead. If the item_sign() method is absent or if it
352 * returns 2, this means: do all the work here. If it returns 3, only
353 * sign. If it returns 1, then there's nothing to do but to return
354 * the signature's length. Everything else is an error.
355 */
356
357 rv = 2;
358 if (pkey->ameth->item_sign != NULL)
359 rv = pkey->ameth->item_sign(ctx, it, asn, algor1, algor2,
360 signature);
361 if (rv <= 0 || rv > 3)
362 goto err;
363 if (rv == 1)
364 goto done;
365 if (rv == 2) {
366 if (!asn1_item_set_algorithm_identifiers(ctx, algor1, algor2))
367 goto err;
368 }
369
370 if (!asn1_item_sign(ctx, it, asn, signature))
371 goto err;
372
373 done:
374 ret = signature->length;
375
376 err:
377 EVP_MD_CTX_cleanup(ctx);
378
379 return ret;
380 }
381 LCRYPTO_ALIAS(ASN1_item_sign_ctx);
382
383 int
ASN1_item_verify(const ASN1_ITEM * it,X509_ALGOR * a,ASN1_BIT_STRING * signature,void * asn,EVP_PKEY * pkey)384 ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a,
385 ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey)
386 {
387 EVP_MD_CTX *md_ctx = NULL;
388 unsigned char *in = NULL;
389 int mdnid, pknid;
390 int in_len = 0;
391 int ret = -1;
392
393 if (pkey == NULL) {
394 ASN1error(ERR_R_PASSED_NULL_PARAMETER);
395 goto err;
396 }
397
398 if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) {
399 ASN1error(ASN1_R_INVALID_BIT_STRING_BITS_LEFT);
400 goto err;
401 }
402
403 if ((md_ctx = EVP_MD_CTX_new()) == NULL)
404 goto err;
405
406 /* Convert signature OID into digest and public key OIDs */
407 if (!OBJ_find_sigid_algs(OBJ_obj2nid(a->algorithm), &mdnid, &pknid)) {
408 ASN1error(ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
409 goto err;
410 }
411 if (mdnid == NID_undef) {
412 if (!pkey->ameth || !pkey->ameth->item_verify) {
413 ASN1error(ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
414 goto err;
415 }
416 ret = pkey->ameth->item_verify(md_ctx, it, asn, a,
417 signature, pkey);
418 /* Return value of 2 means carry on, anything else means we
419 * exit straight away: either a fatal error of the underlying
420 * verification routine handles all verification.
421 */
422 if (ret != 2)
423 goto err;
424 ret = -1;
425 } else {
426 const EVP_MD *type;
427 type = EVP_get_digestbynid(mdnid);
428 if (type == NULL) {
429 ASN1error(ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
430 goto err;
431 }
432
433 /* Check public key OID matches public key type */
434 if (EVP_PKEY_type(pknid) != pkey->ameth->pkey_id) {
435 ASN1error(ASN1_R_WRONG_PUBLIC_KEY_TYPE);
436 goto err;
437 }
438
439 if (!EVP_DigestVerifyInit(md_ctx, NULL, type, NULL, pkey)) {
440 ASN1error(ERR_R_EVP_LIB);
441 ret = 0;
442 goto err;
443 }
444
445 }
446
447 if ((in_len = ASN1_item_i2d(asn, &in, it)) <= 0) {
448 ASN1error(ERR_R_MALLOC_FAILURE);
449 in_len = 0;
450 goto err;
451 }
452
453 if (EVP_DigestVerify(md_ctx, signature->data, signature->length,
454 in, in_len) <= 0) {
455 ASN1error(ERR_R_EVP_LIB);
456 ret = 0;
457 goto err;
458 }
459
460 ret = 1;
461
462 err:
463 EVP_MD_CTX_free(md_ctx);
464 freezero(in, in_len);
465
466 return ret;
467 }
468 LCRYPTO_ALIAS(ASN1_item_verify);
469
470 #define HEADER_SIZE 8
471 #define ASN1_CHUNK_INITIAL_SIZE (16 * 1024)
472 int
asn1_d2i_read_bio(BIO * in,BUF_MEM ** pb)473 asn1_d2i_read_bio(BIO *in, BUF_MEM **pb)
474 {
475 BUF_MEM *b;
476 unsigned char *p;
477 const unsigned char *q;
478 long slen;
479 int i, inf, tag, xclass;
480 size_t want = HEADER_SIZE;
481 int eos = 0;
482 size_t off = 0;
483 size_t len = 0;
484
485 b = BUF_MEM_new();
486 if (b == NULL) {
487 ASN1error(ERR_R_MALLOC_FAILURE);
488 return -1;
489 }
490
491 ERR_clear_error();
492 for (;;) {
493 if (want >= (len - off)) {
494 want -= (len - off);
495
496 if (len + want < len ||
497 !BUF_MEM_grow_clean(b, len + want)) {
498 ASN1error(ERR_R_MALLOC_FAILURE);
499 goto err;
500 }
501 i = BIO_read(in, &(b->data[len]), want);
502 if ((i < 0) && ((len - off) == 0)) {
503 ASN1error(ASN1_R_NOT_ENOUGH_DATA);
504 goto err;
505 }
506 if (i > 0) {
507 if (len + i < len) {
508 ASN1error(ASN1_R_TOO_LONG);
509 goto err;
510 }
511 len += i;
512 }
513 }
514 /* else data already loaded */
515
516 p = (unsigned char *) & (b->data[off]);
517 q = p;
518 inf = ASN1_get_object(&q, &slen, &tag, &xclass, len - off);
519 if (inf & 0x80) {
520 unsigned long e;
521
522 e = ERR_GET_REASON(ERR_peek_error());
523 if (e != ASN1_R_TOO_LONG)
524 goto err;
525 else
526 ERR_clear_error(); /* clear error */
527 }
528 i = q - p; /* header length */
529 off += i; /* end of data */
530
531 if (inf & 1) {
532 /* no data body so go round again */
533 eos++;
534 if (eos < 0) {
535 ASN1error(ASN1_R_HEADER_TOO_LONG);
536 goto err;
537 }
538 want = HEADER_SIZE;
539 } else if (eos && slen == 0 && tag == V_ASN1_EOC) {
540 /* eos value, so go back and read another header */
541 eos--;
542 if (eos <= 0)
543 break;
544 else
545 want = HEADER_SIZE;
546 } else {
547 /* suck in slen bytes of data */
548 want = slen;
549 if (want > (len - off)) {
550 size_t chunk_max = ASN1_CHUNK_INITIAL_SIZE;
551
552 want -= (len - off);
553 if (want > INT_MAX /* BIO_read takes an int length */ ||
554 len+want < len) {
555 ASN1error(ASN1_R_TOO_LONG);
556 goto err;
557 }
558 while (want > 0) {
559 /*
560 * Read content in chunks of increasing size
561 * so we can return an error for EOF without
562 * having to allocate the entire content length
563 * in one go.
564 */
565 size_t chunk = want > chunk_max ? chunk_max : want;
566
567 if (!BUF_MEM_grow_clean(b, len + chunk)) {
568 ASN1error(ERR_R_MALLOC_FAILURE);
569 goto err;
570 }
571 want -= chunk;
572 while (chunk > 0) {
573 i = BIO_read(in, &(b->data[len]), chunk);
574 if (i <= 0) {
575 ASN1error(ASN1_R_NOT_ENOUGH_DATA);
576 goto err;
577 }
578 /*
579 * This can't overflow because |len+want|
580 * didn't overflow.
581 */
582 len += i;
583 chunk -= i;
584 }
585 if (chunk_max < INT_MAX/2)
586 chunk_max *= 2;
587 }
588 }
589 if (off + slen < off) {
590 ASN1error(ASN1_R_TOO_LONG);
591 goto err;
592 }
593 off += slen;
594 if (eos <= 0) {
595 break;
596 } else
597 want = HEADER_SIZE;
598 }
599 }
600
601 if (off > INT_MAX) {
602 ASN1error(ASN1_R_TOO_LONG);
603 goto err;
604 }
605
606 *pb = b;
607 return off;
608
609 err:
610 if (b != NULL)
611 BUF_MEM_free(b);
612 return -1;
613 }
614
615 void *
ASN1_item_d2i_bio(const ASN1_ITEM * it,BIO * in,void * x)616 ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x)
617 {
618 BUF_MEM *b = NULL;
619 const unsigned char *p;
620 void *ret = NULL;
621 int len;
622
623 len = asn1_d2i_read_bio(in, &b);
624 if (len < 0)
625 goto err;
626
627 p = (const unsigned char *)b->data;
628 ret = ASN1_item_d2i(x, &p, len, it);
629
630 err:
631 if (b != NULL)
632 BUF_MEM_free(b);
633 return (ret);
634 }
635 LCRYPTO_ALIAS(ASN1_item_d2i_bio);
636
637 void *
ASN1_item_d2i_fp(const ASN1_ITEM * it,FILE * in,void * x)638 ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x)
639 {
640 BIO *b;
641 char *ret;
642
643 if ((b = BIO_new(BIO_s_file())) == NULL) {
644 ASN1error(ERR_R_BUF_LIB);
645 return (NULL);
646 }
647 BIO_set_fp(b, in, BIO_NOCLOSE);
648 ret = ASN1_item_d2i_bio(it, b, x);
649 BIO_free(b);
650 return (ret);
651 }
652 LCRYPTO_ALIAS(ASN1_item_d2i_fp);
653
654 int
ASN1_item_i2d_bio(const ASN1_ITEM * it,BIO * out,void * x)655 ASN1_item_i2d_bio(const ASN1_ITEM *it, BIO *out, void *x)
656 {
657 unsigned char *b = NULL;
658 int i, j = 0, n, ret = 1;
659
660 n = ASN1_item_i2d(x, &b, it);
661 if (b == NULL) {
662 ASN1error(ERR_R_MALLOC_FAILURE);
663 return (0);
664 }
665
666 for (;;) {
667 i = BIO_write(out, &(b[j]), n);
668 if (i == n)
669 break;
670 if (i <= 0) {
671 ret = 0;
672 break;
673 }
674 j += i;
675 n -= i;
676 }
677 free(b);
678 return (ret);
679 }
680 LCRYPTO_ALIAS(ASN1_item_i2d_bio);
681
682 int
ASN1_item_i2d_fp(const ASN1_ITEM * it,FILE * out,void * x)683 ASN1_item_i2d_fp(const ASN1_ITEM *it, FILE *out, void *x)
684 {
685 BIO *b;
686 int ret;
687
688 if ((b = BIO_new(BIO_s_file())) == NULL) {
689 ASN1error(ERR_R_BUF_LIB);
690 return (0);
691 }
692 BIO_set_fp(b, out, BIO_NOCLOSE);
693 ret = ASN1_item_i2d_bio(it, b, x);
694 BIO_free(b);
695 return (ret);
696 }
697 LCRYPTO_ALIAS(ASN1_item_i2d_fp);
698