1 /* $OpenBSD: a_int.c,v 1.46 2022/08/28 17:49:25 jsing 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 #include <limits.h>
60 #include <stdio.h>
61 #include <string.h>
62
63 #include <openssl/asn1.h>
64 #include <openssl/asn1t.h>
65 #include <openssl/bn.h>
66 #include <openssl/buffer.h>
67 #include <openssl/err.h>
68
69 #include "bytestring.h"
70
71 const ASN1_ITEM ASN1_INTEGER_it = {
72 .itype = ASN1_ITYPE_PRIMITIVE,
73 .utype = V_ASN1_INTEGER,
74 .sname = "ASN1_INTEGER",
75 };
76
77 ASN1_INTEGER *
ASN1_INTEGER_new(void)78 ASN1_INTEGER_new(void)
79 {
80 return (ASN1_INTEGER *)ASN1_item_new(&ASN1_INTEGER_it);
81 }
82
83 static void
asn1_aint_clear(ASN1_INTEGER * aint)84 asn1_aint_clear(ASN1_INTEGER *aint)
85 {
86 freezero(aint->data, aint->length);
87
88 memset(aint, 0, sizeof(*aint));
89
90 aint->type = V_ASN1_INTEGER;
91 }
92
93 void
ASN1_INTEGER_free(ASN1_INTEGER * a)94 ASN1_INTEGER_free(ASN1_INTEGER *a)
95 {
96 ASN1_item_free((ASN1_VALUE *)a, &ASN1_INTEGER_it);
97 }
98
99 static int
ASN1_INTEGER_valid(const ASN1_INTEGER * a)100 ASN1_INTEGER_valid(const ASN1_INTEGER *a)
101 {
102 return (a != NULL && a->length >= 0);
103 }
104
105 ASN1_INTEGER *
ASN1_INTEGER_dup(const ASN1_INTEGER * x)106 ASN1_INTEGER_dup(const ASN1_INTEGER *x)
107 {
108 if (!ASN1_INTEGER_valid(x))
109 return NULL;
110
111 return ASN1_STRING_dup(x);
112 }
113
114 int
ASN1_INTEGER_cmp(const ASN1_INTEGER * a,const ASN1_INTEGER * b)115 ASN1_INTEGER_cmp(const ASN1_INTEGER *a, const ASN1_INTEGER *b)
116 {
117 int ret = 1;
118
119 /* Compare sign, then content. */
120 if ((a->type & V_ASN1_NEG) == (b->type & V_ASN1_NEG))
121 ret = ASN1_STRING_cmp(a, b);
122
123 if ((a->type & V_ASN1_NEG) != 0)
124 return -ret;
125
126 return ret;
127 }
128
129 int
asn1_aint_get_uint64(CBS * cbs,uint64_t * out_val)130 asn1_aint_get_uint64(CBS *cbs, uint64_t *out_val)
131 {
132 uint64_t val = 0;
133 uint8_t u8;
134
135 *out_val = 0;
136
137 while (CBS_len(cbs) > 0) {
138 if (!CBS_get_u8(cbs, &u8))
139 return 0;
140 if (val > (UINT64_MAX >> 8)) {
141 ASN1error(ASN1_R_TOO_LARGE);
142 return 0;
143 }
144 val = val << 8 | u8;
145 }
146
147 *out_val = val;
148
149 return 1;
150 }
151
152 int
asn1_aint_set_uint64(uint64_t val,uint8_t ** out_data,int * out_len)153 asn1_aint_set_uint64(uint64_t val, uint8_t **out_data, int *out_len)
154 {
155 uint8_t *data = NULL;
156 size_t data_len = 0;
157 int started = 0;
158 uint8_t u8;
159 CBB cbb;
160 int i;
161 int ret = 0;
162
163 if (!CBB_init(&cbb, sizeof(long)))
164 goto err;
165
166 if (out_data == NULL || out_len == NULL)
167 goto err;
168 if (*out_data != NULL || *out_len != 0)
169 goto err;
170
171 for (i = sizeof(uint64_t) - 1; i >= 0; i--) {
172 u8 = (val >> (i * 8)) & 0xff;
173 if (!started && i != 0 && u8 == 0)
174 continue;
175 if (!CBB_add_u8(&cbb, u8))
176 goto err;
177 started = 1;
178 }
179
180 if (!CBB_finish(&cbb, &data, &data_len))
181 goto err;
182 if (data_len > INT_MAX)
183 goto err;
184
185 *out_data = data;
186 *out_len = (int)data_len;
187 data = NULL;
188
189 ret = 1;
190 err:
191 CBB_cleanup(&cbb);
192 freezero(data, data_len);
193
194 return ret;
195 }
196
197 int
asn1_aint_get_int64(CBS * cbs,int negative,int64_t * out_val)198 asn1_aint_get_int64(CBS *cbs, int negative, int64_t *out_val)
199 {
200 uint64_t val;
201
202 if (!asn1_aint_get_uint64(cbs, &val))
203 return 0;
204
205 if (negative) {
206 if (val > (uint64_t)INT64_MIN) {
207 ASN1error(ASN1_R_TOO_SMALL);
208 return 0;
209 }
210 *out_val = (int64_t)-val;
211 } else {
212 if (val > (uint64_t)INT64_MAX) {
213 ASN1error(ASN1_R_TOO_LARGE);
214 return 0;
215 }
216 *out_val = (int64_t)val;
217 }
218
219 return 1;
220 }
221
222 int
ASN1_INTEGER_get_uint64(uint64_t * out_val,const ASN1_INTEGER * aint)223 ASN1_INTEGER_get_uint64(uint64_t *out_val, const ASN1_INTEGER *aint)
224 {
225 uint64_t val;
226 CBS cbs;
227
228 *out_val = 0;
229
230 if (aint == NULL || aint->length < 0)
231 return 0;
232
233 if (aint->type == V_ASN1_NEG_INTEGER) {
234 ASN1error(ASN1_R_ILLEGAL_NEGATIVE_VALUE);
235 return 0;
236 }
237 if (aint->type != V_ASN1_INTEGER) {
238 ASN1error(ASN1_R_WRONG_INTEGER_TYPE);
239 return 0;
240 }
241
242 CBS_init(&cbs, aint->data, aint->length);
243
244 if (!asn1_aint_get_uint64(&cbs, &val))
245 return 0;
246
247 *out_val = val;
248
249 return 1;
250 }
251
252 int
ASN1_INTEGER_set_uint64(ASN1_INTEGER * aint,uint64_t val)253 ASN1_INTEGER_set_uint64(ASN1_INTEGER *aint, uint64_t val)
254 {
255 asn1_aint_clear(aint);
256
257 return asn1_aint_set_uint64(val, &aint->data, &aint->length);
258 }
259
260 int
ASN1_INTEGER_get_int64(int64_t * out_val,const ASN1_INTEGER * aint)261 ASN1_INTEGER_get_int64(int64_t *out_val, const ASN1_INTEGER *aint)
262 {
263 CBS cbs;
264
265 *out_val = 0;
266
267 if (aint == NULL || aint->length < 0)
268 return 0;
269
270 if (aint->type != V_ASN1_INTEGER &&
271 aint->type != V_ASN1_NEG_INTEGER) {
272 ASN1error(ASN1_R_WRONG_INTEGER_TYPE);
273 return 0;
274 }
275
276 CBS_init(&cbs, aint->data, aint->length);
277
278 return asn1_aint_get_int64(&cbs, (aint->type == V_ASN1_NEG_INTEGER),
279 out_val);
280 }
281
282 int
ASN1_INTEGER_set_int64(ASN1_INTEGER * aint,int64_t val)283 ASN1_INTEGER_set_int64(ASN1_INTEGER *aint, int64_t val)
284 {
285 uint64_t uval;
286
287 asn1_aint_clear(aint);
288
289 uval = (uint64_t)val;
290
291 if (val < 0) {
292 aint->type = V_ASN1_NEG_INTEGER;
293 uval = -uval;
294 }
295
296 return asn1_aint_set_uint64(uval, &aint->data, &aint->length);
297 }
298
299 long
ASN1_INTEGER_get(const ASN1_INTEGER * aint)300 ASN1_INTEGER_get(const ASN1_INTEGER *aint)
301 {
302 int64_t val;
303
304 if (aint == NULL)
305 return 0;
306 if (!ASN1_INTEGER_get_int64(&val, aint))
307 return -1;
308 if (val < LONG_MIN || val > LONG_MAX) {
309 /* hmm... a bit ugly, return all ones */
310 return -1;
311 }
312
313 return (long)val;
314 }
315
316 int
ASN1_INTEGER_set(ASN1_INTEGER * aint,long val)317 ASN1_INTEGER_set(ASN1_INTEGER *aint, long val)
318 {
319 return ASN1_INTEGER_set_int64(aint, val);
320 }
321
322 ASN1_INTEGER *
BN_to_ASN1_INTEGER(const BIGNUM * bn,ASN1_INTEGER * ai)323 BN_to_ASN1_INTEGER(const BIGNUM *bn, ASN1_INTEGER *ai)
324 {
325 ASN1_INTEGER *ret;
326 int len, j;
327
328 if (ai == NULL)
329 ret = ASN1_INTEGER_new();
330 else
331 ret = ai;
332 if (ret == NULL) {
333 ASN1error(ERR_R_NESTED_ASN1_ERROR);
334 goto err;
335 }
336
337 if (!ASN1_INTEGER_valid(ret))
338 goto err;
339
340 if (BN_is_negative(bn))
341 ret->type = V_ASN1_NEG_INTEGER;
342 else
343 ret->type = V_ASN1_INTEGER;
344 j = BN_num_bits(bn);
345 len = ((j == 0) ? 0 : ((j / 8) + 1));
346 if (ret->length < len + 4) {
347 unsigned char *new_data = realloc(ret->data, len + 4);
348 if (!new_data) {
349 ASN1error(ERR_R_MALLOC_FAILURE);
350 goto err;
351 }
352 ret->data = new_data;
353 }
354 ret->length = BN_bn2bin(bn, ret->data);
355
356 /* Correct zero case */
357 if (!ret->length) {
358 ret->data[0] = 0;
359 ret->length = 1;
360 }
361 return (ret);
362
363 err:
364 if (ret != ai)
365 ASN1_INTEGER_free(ret);
366 return (NULL);
367 }
368
369 BIGNUM *
ASN1_INTEGER_to_BN(const ASN1_INTEGER * ai,BIGNUM * bn)370 ASN1_INTEGER_to_BN(const ASN1_INTEGER *ai, BIGNUM *bn)
371 {
372 BIGNUM *ret;
373
374 if (!ASN1_INTEGER_valid(ai))
375 return (NULL);
376
377 if ((ret = BN_bin2bn(ai->data, ai->length, bn)) == NULL)
378 ASN1error(ASN1_R_BN_LIB);
379 else if (ai->type == V_ASN1_NEG_INTEGER)
380 BN_set_negative(ret, 1);
381 return (ret);
382 }
383
384 int
i2a_ASN1_INTEGER(BIO * bp,const ASN1_INTEGER * a)385 i2a_ASN1_INTEGER(BIO *bp, const ASN1_INTEGER *a)
386 {
387 int i, n = 0;
388 static const char h[] = "0123456789ABCDEF";
389 char buf[2];
390
391 if (a == NULL)
392 return (0);
393
394 if (a->type & V_ASN1_NEG) {
395 if (BIO_write(bp, "-", 1) != 1)
396 goto err;
397 n = 1;
398 }
399
400 if (a->length == 0) {
401 if (BIO_write(bp, "00", 2) != 2)
402 goto err;
403 n += 2;
404 } else {
405 for (i = 0; i < a->length; i++) {
406 if ((i != 0) && (i % 35 == 0)) {
407 if (BIO_write(bp, "\\\n", 2) != 2)
408 goto err;
409 n += 2;
410 }
411 buf[0] = h[((unsigned char)a->data[i] >> 4) & 0x0f];
412 buf[1] = h[((unsigned char)a->data[i]) & 0x0f];
413 if (BIO_write(bp, buf, 2) != 2)
414 goto err;
415 n += 2;
416 }
417 }
418 return (n);
419
420 err:
421 return (-1);
422 }
423
424 int
a2i_ASN1_INTEGER(BIO * bp,ASN1_INTEGER * bs,char * buf,int size)425 a2i_ASN1_INTEGER(BIO *bp, ASN1_INTEGER *bs, char *buf, int size)
426 {
427 int ret = 0;
428 int i, j,k, m,n, again, bufsize;
429 unsigned char *s = NULL, *sp;
430 unsigned char *bufp;
431 int num = 0, slen = 0, first = 1;
432
433 bs->type = V_ASN1_INTEGER;
434
435 bufsize = BIO_gets(bp, buf, size);
436 for (;;) {
437 if (bufsize < 1)
438 goto err_sl;
439 i = bufsize;
440 if (buf[i - 1] == '\n')
441 buf[--i] = '\0';
442 if (i == 0)
443 goto err_sl;
444 if (buf[i - 1] == '\r')
445 buf[--i] = '\0';
446 if (i == 0)
447 goto err_sl;
448 if (buf[i - 1] == '\\') {
449 i--;
450 again = 1;
451 } else
452 again = 0;
453 buf[i] = '\0';
454 if (i < 2)
455 goto err_sl;
456
457 bufp = (unsigned char *)buf;
458 if (first) {
459 first = 0;
460 if ((bufp[0] == '0') && (buf[1] == '0')) {
461 bufp += 2;
462 i -= 2;
463 }
464 }
465 k = 0;
466 if (i % 2 != 0) {
467 ASN1error(ASN1_R_ODD_NUMBER_OF_CHARS);
468 goto err;
469 }
470 i /= 2;
471 if (num + i > slen) {
472 if ((sp = recallocarray(s, slen, num + i, 1)) == NULL) {
473 ASN1error(ERR_R_MALLOC_FAILURE);
474 goto err;
475 }
476 s = sp;
477 slen = num + i;
478 }
479 for (j = 0; j < i; j++, k += 2) {
480 for (n = 0; n < 2; n++) {
481 m = bufp[k + n];
482 if ((m >= '0') && (m <= '9'))
483 m -= '0';
484 else if ((m >= 'a') && (m <= 'f'))
485 m = m - 'a' + 10;
486 else if ((m >= 'A') && (m <= 'F'))
487 m = m - 'A' + 10;
488 else {
489 ASN1error(ASN1_R_NON_HEX_CHARACTERS);
490 goto err;
491 }
492 s[num + j] <<= 4;
493 s[num + j] |= m;
494 }
495 }
496 num += i;
497 if (again)
498 bufsize = BIO_gets(bp, buf, size);
499 else
500 break;
501 }
502 bs->length = num;
503 bs->data = s;
504 return (1);
505
506 err_sl:
507 ASN1error(ASN1_R_SHORT_LINE);
508 err:
509 free(s);
510 return (ret);
511 }
512
513 static void
asn1_aint_twos_complement(uint8_t * data,size_t data_len)514 asn1_aint_twos_complement(uint8_t *data, size_t data_len)
515 {
516 uint8_t carry = 1;
517 ssize_t i;
518
519 for (i = data_len - 1; i >= 0; i--) {
520 data[i] = (data[i] ^ 0xff) + carry;
521 if (data[i] != 0)
522 carry = 0;
523 }
524 }
525
526 static int
asn1_aint_keep_twos_padding(const uint8_t * data,size_t data_len)527 asn1_aint_keep_twos_padding(const uint8_t *data, size_t data_len)
528 {
529 size_t i;
530
531 /*
532 * If a two's complement value has a padding byte (0xff) and the rest
533 * of the value is all zeros, the padding byte cannot be removed as when
534 * converted from two's complement this becomes 0x01 (in the place of
535 * the padding byte) followed by the same number of zero bytes.
536 */
537 if (data_len <= 1 || data[0] != 0xff)
538 return 0;
539 for (i = 1; i < data_len; i++) {
540 if (data[i] != 0)
541 return 0;
542 }
543 return 1;
544 }
545
546 static int
i2c_ASN1_INTEGER_cbb(ASN1_INTEGER * aint,CBB * cbb)547 i2c_ASN1_INTEGER_cbb(ASN1_INTEGER *aint, CBB *cbb)
548 {
549 uint8_t *data = NULL;
550 size_t data_len = 0;
551 uint8_t padding, val;
552 uint8_t msb;
553 CBS cbs;
554 int ret = 0;
555
556 if (aint->length < 0)
557 goto err;
558 if (aint->data == NULL && aint->length != 0)
559 goto err;
560
561 if ((aint->type & ~V_ASN1_NEG) != V_ASN1_ENUMERATED &&
562 (aint->type & ~V_ASN1_NEG) != V_ASN1_INTEGER)
563 goto err;
564
565 CBS_init(&cbs, aint->data, aint->length);
566
567 /* Find the first non-zero byte. */
568 while (CBS_len(&cbs) > 0) {
569 if (!CBS_peek_u8(&cbs, &val))
570 goto err;
571 if (val != 0)
572 break;
573 if (!CBS_skip(&cbs, 1))
574 goto err;
575 }
576
577 /* A zero value is encoded as a single octet. */
578 if (CBS_len(&cbs) == 0) {
579 if (!CBB_add_u8(cbb, 0))
580 goto err;
581 goto done;
582 }
583
584 if (!CBS_stow(&cbs, &data, &data_len))
585 goto err;
586
587 if ((aint->type & V_ASN1_NEG) != 0)
588 asn1_aint_twos_complement(data, data_len);
589
590 /* Topmost bit indicates sign, padding is all zeros or all ones. */
591 msb = (data[0] >> 7);
592 padding = (msb - 1) & 0xff;
593
594 /* See if we need a padding octet to avoid incorrect sign. */
595 if (((aint->type & V_ASN1_NEG) == 0 && msb == 1) ||
596 ((aint->type & V_ASN1_NEG) != 0 && msb == 0)) {
597 if (!CBB_add_u8(cbb, padding))
598 goto err;
599 }
600 if (!CBB_add_bytes(cbb, data, data_len))
601 goto err;
602
603 done:
604 ret = 1;
605
606 err:
607 freezero(data, data_len);
608
609 return ret;
610 }
611
612 int
i2c_ASN1_INTEGER(ASN1_INTEGER * aint,unsigned char ** pp)613 i2c_ASN1_INTEGER(ASN1_INTEGER *aint, unsigned char **pp)
614 {
615 uint8_t *data = NULL;
616 size_t data_len = 0;
617 CBB cbb;
618 int ret = -3;
619
620 if (!CBB_init(&cbb, 0))
621 goto err;
622 if (!i2c_ASN1_INTEGER_cbb(aint, &cbb))
623 goto err;
624 if (!CBB_finish(&cbb, &data, &data_len))
625 goto err;
626 if (data_len > INT_MAX)
627 goto err;
628
629 if (pp != NULL) {
630 if ((uintptr_t)*pp > UINTPTR_MAX - data_len)
631 goto err;
632 memcpy(*pp, data, data_len);
633 *pp += data_len;
634 }
635
636 ret = data_len;
637
638 err:
639 freezero(data, data_len);
640 CBB_cleanup(&cbb);
641
642 return ret;
643 }
644
645 int
c2i_ASN1_INTEGER_cbs(ASN1_INTEGER ** out_aint,CBS * cbs)646 c2i_ASN1_INTEGER_cbs(ASN1_INTEGER **out_aint, CBS *cbs)
647 {
648 ASN1_INTEGER *aint = NULL;
649 uint8_t *data = NULL;
650 size_t data_len = 0;
651 uint8_t padding, val;
652 uint8_t negative;
653 int ret = 0;
654
655 if (out_aint == NULL)
656 goto err;
657
658 if (*out_aint != NULL) {
659 ASN1_INTEGER_free(*out_aint);
660 *out_aint = NULL;
661 }
662
663 if (CBS_len(cbs) == 0) {
664 /* XXX INVALID ENCODING? */
665 ASN1error(ERR_R_ASN1_LENGTH_MISMATCH);
666 goto err;
667 }
668 if (!CBS_peek_u8(cbs, &val))
669 goto err;
670
671 /* Topmost bit indicates sign, padding is all zeros or all ones. */
672 negative = (val >> 7);
673 padding = ~(negative - 1) & 0xff;
674
675 /*
676 * Ensure that the first 9 bits are not all zero or all one, as per
677 * X.690 section 8.3.2. Remove the padding octet if possible.
678 */
679 if (CBS_len(cbs) > 1 && val == padding) {
680 if (!asn1_aint_keep_twos_padding(CBS_data(cbs), CBS_len(cbs))) {
681 if (!CBS_get_u8(cbs, &padding))
682 goto err;
683 if (!CBS_peek_u8(cbs, &val))
684 goto err;
685 if ((val >> 7) == (padding >> 7)) {
686 /* XXX INVALID ENCODING? */
687 ASN1error(ERR_R_ASN1_LENGTH_MISMATCH);
688 goto err;
689 }
690 }
691 }
692
693 if (!CBS_stow(cbs, &data, &data_len))
694 goto err;
695 if (data_len > INT_MAX)
696 goto err;
697
698 if ((aint = ASN1_INTEGER_new()) == NULL)
699 goto err;
700
701 /*
702 * Negative integers are handled as a separate type - convert from
703 * two's complement for internal representation.
704 */
705 if (negative) {
706 aint->type = V_ASN1_NEG_INTEGER;
707 asn1_aint_twos_complement(data, data_len);
708 }
709
710 aint->data = data;
711 aint->length = (int)data_len;
712 data = NULL;
713
714 *out_aint = aint;
715 aint = NULL;
716
717 ret = 1;
718
719 err:
720 ASN1_INTEGER_free(aint);
721 freezero(data, data_len);
722
723 return ret;
724 }
725
726 ASN1_INTEGER *
c2i_ASN1_INTEGER(ASN1_INTEGER ** out_aint,const unsigned char ** pp,long len)727 c2i_ASN1_INTEGER(ASN1_INTEGER **out_aint, const unsigned char **pp, long len)
728 {
729 ASN1_INTEGER *aint = NULL;
730 CBS content;
731
732 if (out_aint != NULL) {
733 ASN1_INTEGER_free(*out_aint);
734 *out_aint = NULL;
735 }
736
737 if (len < 0) {
738 ASN1error(ASN1_R_LENGTH_ERROR);
739 return NULL;
740 }
741
742 CBS_init(&content, *pp, len);
743
744 if (!c2i_ASN1_INTEGER_cbs(&aint, &content))
745 return NULL;
746
747 *pp = CBS_data(&content);
748
749 if (out_aint != NULL)
750 *out_aint = aint;
751
752 return aint;
753 }
754
755 int
i2d_ASN1_INTEGER(ASN1_INTEGER * a,unsigned char ** out)756 i2d_ASN1_INTEGER(ASN1_INTEGER *a, unsigned char **out)
757 {
758 return ASN1_item_i2d((ASN1_VALUE *)a, out, &ASN1_INTEGER_it);
759 }
760
761 ASN1_INTEGER *
d2i_ASN1_INTEGER(ASN1_INTEGER ** a,const unsigned char ** in,long len)762 d2i_ASN1_INTEGER(ASN1_INTEGER **a, const unsigned char **in, long len)
763 {
764 return (ASN1_INTEGER *)ASN1_item_d2i((ASN1_VALUE **)a, in, len,
765 &ASN1_INTEGER_it);
766 }
767
768 /* This is a version of d2i_ASN1_INTEGER that ignores the sign bit of
769 * ASN1 integers: some broken software can encode a positive INTEGER
770 * with its MSB set as negative (it doesn't add a padding zero).
771 */
772
773 ASN1_INTEGER *
d2i_ASN1_UINTEGER(ASN1_INTEGER ** a,const unsigned char ** pp,long length)774 d2i_ASN1_UINTEGER(ASN1_INTEGER **a, const unsigned char **pp, long length)
775 {
776 ASN1_INTEGER *ret = NULL;
777 const unsigned char *p;
778 unsigned char *s;
779 long len;
780 int inf, tag, xclass;
781 int i;
782
783 if ((a == NULL) || ((*a) == NULL)) {
784 if ((ret = ASN1_INTEGER_new()) == NULL)
785 return (NULL);
786 } else
787 ret = (*a);
788
789 if (!ASN1_INTEGER_valid(ret)) {
790 i = ERR_R_ASN1_LENGTH_MISMATCH;
791 goto err;
792 }
793
794 p = *pp;
795 inf = ASN1_get_object(&p, &len, &tag, &xclass, length);
796 if (inf & 0x80) {
797 i = ASN1_R_BAD_OBJECT_HEADER;
798 goto err;
799 }
800
801 if (tag != V_ASN1_INTEGER) {
802 i = ASN1_R_EXPECTING_AN_INTEGER;
803 goto err;
804 }
805
806 /* We must malloc stuff, even for 0 bytes otherwise it
807 * signifies a missing NULL parameter. */
808 if (len < 0 || len > INT_MAX) {
809 i = ERR_R_ASN1_LENGTH_MISMATCH;
810 goto err;
811 }
812 s = malloc(len + 1);
813 if (s == NULL) {
814 i = ERR_R_MALLOC_FAILURE;
815 goto err;
816 }
817 ret->type = V_ASN1_INTEGER;
818 if (len) {
819 if ((*p == 0) && (len != 1)) {
820 p++;
821 len--;
822 }
823 memcpy(s, p, len);
824 p += len;
825 }
826
827 free(ret->data);
828 ret->data = s;
829 ret->length = (int)len;
830 if (a != NULL)
831 (*a) = ret;
832 *pp = p;
833 return (ret);
834
835 err:
836 ASN1error(i);
837 if (a == NULL || *a != ret)
838 ASN1_INTEGER_free(ret);
839 return (NULL);
840 }
841