1 /* $OpenBSD: asn1_lib.c,v 1.44.10.1 2020/12/08 15:08:47 tb Exp $ */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
63 #include <openssl/asn1.h>
64 #include <openssl/err.h>
66 static int asn1_get_length(const unsigned char **pp, int *inf, long *rl, int max);
67 static void asn1_put_length(unsigned char **pp, int length);
70 _asn1_check_infinite_end(const unsigned char **p, long len)
72 /* If there is 0 or 1 byte left, the length check should pick
76 else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0)) {
84 ASN1_check_infinite_end(unsigned char **p, long len)
86 return _asn1_check_infinite_end((const unsigned char **)p, len);
90 ASN1_const_check_infinite_end(const unsigned char **p, long len)
92 return _asn1_check_infinite_end(p, len);
96 ASN1_get_object(const unsigned char **pp, long *plength, int *ptag,
97 int *pclass, long omax)
101 const unsigned char *p = *pp;
102 int tag, xclass, inf;
107 ret = (*p & V_ASN1_CONSTRUCTED);
108 xclass = (*p & V_ASN1_PRIVATE);
109 i = *p & V_ASN1_PRIMITIVE_TAG;
110 if (i == V_ASN1_PRIMITIVE_TAG) { /* high-tag */
120 if (l > (INT_MAX >> 7L))
136 if (!asn1_get_length(&p, &inf, plength, (int)max))
139 if (inf && !(ret & V_ASN1_CONSTRUCTED))
142 if (*plength > (omax - (p - *pp))) {
143 ASN1error(ASN1_R_TOO_LONG);
144 /* Set this so that even if things are not long enough
145 * the values are set correctly */
152 ASN1error(ASN1_R_HEADER_TOO_LONG);
157 asn1_get_length(const unsigned char **pp, int *inf, long *rl, int max)
159 const unsigned char *p = *pp;
160 unsigned long ret = 0;
175 /* skip leading zeroes */
176 while (i && *p == 0) {
180 if (i > sizeof(long))
196 /* class 0 is constructed
197 * constructed == 2 for indefinite length constructed */
199 ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
202 unsigned char *p = *pp;
205 i = (constructed) ? V_ASN1_CONSTRUCTED : 0;
206 i |= (xclass & V_ASN1_PRIVATE);
208 *(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG);
210 *(p++) = i | V_ASN1_PRIMITIVE_TAG;
211 for(i = 0, ttag = tag; ttag > 0; i++)
222 if (constructed == 2)
225 asn1_put_length(&p, length);
230 ASN1_put_eoc(unsigned char **pp)
232 unsigned char *p = *pp;
241 asn1_put_length(unsigned char **pp, int length)
243 unsigned char *p = *pp;
247 *(p++) = (unsigned char)length;
250 for (i = 0; l > 0; i++)
255 p[i] = length & 0xff;
264 ASN1_object_size(int constructed, int length, int tag)
276 if (constructed == 2)
289 ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str)
293 dst->type = str->type;
294 if (!ASN1_STRING_set(dst, str->data, str->length))
296 dst->flags = str->flags;
301 ASN1_STRING_dup(const ASN1_STRING *str)
307 ret = ASN1_STRING_new();
310 if (!ASN1_STRING_copy(ret, str)) {
311 ASN1_STRING_free(ret);
318 ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
320 const char *data = _data;
328 if ((str->length < len) || (str->data == NULL)) {
330 tmp = realloc(str->data, len + 1);
332 ASN1error(ERR_R_MALLOC_FAILURE);
339 memmove(str->data, data, len);
341 str->data[str->length] = '\0';
346 ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
348 freezero(str->data, str->length);
354 ASN1_STRING_new(void)
356 return (ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
360 ASN1_STRING_type_new(int type)
364 ret = malloc(sizeof(ASN1_STRING));
366 ASN1error(ERR_R_MALLOC_FAILURE);
377 ASN1_STRING_free(ASN1_STRING *a)
381 if (a->data != NULL && !(a->flags & ASN1_STRING_FLAG_NDEF))
382 freezero(a->data, a->length);
387 ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
391 if (a == NULL || b == NULL)
393 i = (a->length - b->length);
395 i = memcmp(a->data, b->data, a->length);
397 return (a->type - b->type);
405 asn1_add_error(const unsigned char *address, int offset)
407 ERR_asprintf_error_data("offset=%d", offset);
411 ASN1_STRING_length(const ASN1_STRING *x)
417 ASN1_STRING_length_set(ASN1_STRING *x, int len)
423 ASN1_STRING_type(const ASN1_STRING *x)
429 ASN1_STRING_data(ASN1_STRING *x)
434 const unsigned char *
435 ASN1_STRING_get0_data(const ASN1_STRING *x)