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1/* crypto/asn1/asn1_lib.c */
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 <stdio.h>
60#include <limits.h>
61#include "cryptlib.h"
62#include <openssl/asn1.h>
63
64static int asn1_get_length(unsigned char **pp,int *inf,long *rl,int max);
65static void asn1_put_length(unsigned char **pp, int length);
66const char *ASN1_version="ASN.1" OPENSSL_VERSION_PTEXT;
67
68int ASN1_check_infinite_end(unsigned char **p, long len)
69 {
70 /* If there is 0 or 1 byte left, the length check should pick
71 * things up */
72 if (len <= 0)
73 return(1);
74 else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0))
75 {
76 (*p)+=2;
77 return(1);
78 }
79 return(0);
80 }
81
82
83int ASN1_get_object(unsigned char **pp, long *plength, int *ptag, int *pclass,
84 long omax)
85 {
86 int i,ret;
87 long l;
88 unsigned char *p= *pp;
89 int tag,xclass,inf;
90 long max=omax;
91
92 if (!max) goto err;
93 ret=(*p&V_ASN1_CONSTRUCTED);
94 xclass=(*p&V_ASN1_PRIVATE);
95 i= *p&V_ASN1_PRIMITIVE_TAG;
96 if (i == V_ASN1_PRIMITIVE_TAG)
97 { /* high-tag */
98 p++;
99 if (--max == 0) goto err;
100 l=0;
101 while (*p&0x80)
102 {
103 l<<=7L;
104 l|= *(p++)&0x7f;
105 if (--max == 0) goto err;
106 }
107 l<<=7L;
108 l|= *(p++)&0x7f;
109 tag=(int)l;
110 }
111 else
112 {
113 tag=i;
114 p++;
115 if (--max == 0) goto err;
116 }
117 *ptag=tag;
118 *pclass=xclass;
119 if (!asn1_get_length(&p,&inf,plength,(int)max)) goto err;
120
121#if 0
122 fprintf(stderr,"p=%d + *plength=%ld > omax=%ld + *pp=%d (%d > %d)\n",
123 (int)p,*plength,omax,(int)*pp,(int)(p+ *plength),
124 (int)(omax+ *pp));
125
126#endif
127 if (*plength > (omax - (p - *pp)))
128 {
129 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_TOO_LONG);
130 /* Set this so that even if things are not long enough
131 * the values are set correctly */
132 ret|=0x80;
133 }
134 *pp=p;
135 return(ret|inf);
136err:
137 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG);
138 return(0x80);
139 }
140
141static int asn1_get_length(unsigned char **pp, int *inf, long *rl, int max)
142 {
143 unsigned char *p= *pp;
144 unsigned long ret=0;
145 int i;
146
147 if (max-- < 1) return(0);
148 if (*p == 0x80)
149 {
150 *inf=1;
151 ret=0;
152 p++;
153 }
154 else
155 {
156 *inf=0;
157 i= *p&0x7f;
158 if (*(p++) & 0x80)
159 {
160 if (i > sizeof(long))
161 return 0;
162 if (max-- == 0) return(0);
163 while (i-- > 0)
164 {
165 ret<<=8L;
166 ret|= *(p++);
167 if (max-- == 0) return(0);
168 }
169 }
170 else
171 ret=i;
172 }
173 if (ret > LONG_MAX)
174 return 0;
175 *pp=p;
176 *rl=(long)ret;
177 return(1);
178 }
179
180/* class 0 is constructed
181 * constructed == 2 for indefinite length constructed */
182void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
183 int xclass)
184 {
185 unsigned char *p= *pp;
186 int i, ttag;
187
188 i=(constructed)?V_ASN1_CONSTRUCTED:0;
189 i|=(xclass&V_ASN1_PRIVATE);
190 if (tag < 31)
191 *(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG);
192 else
193 {
194 *(p++)=i|V_ASN1_PRIMITIVE_TAG;
195 for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7;
196 ttag = i;
197 while(i-- > 0)
198 {
199 p[i] = tag & 0x7f;
200 if(i != (ttag - 1)) p[i] |= 0x80;
201 tag >>= 7;
202 }
203 p += ttag;
204 }
205 if ((constructed == 2) && (length == 0))
206 *(p++)=0x80; /* der_put_length would output 0 instead */
207 else
208 asn1_put_length(&p,length);
209 *pp=p;
210 }
211
212static void asn1_put_length(unsigned char **pp, int length)
213 {
214 unsigned char *p= *pp;
215 int i,l;
216 if (length <= 127)
217 *(p++)=(unsigned char)length;
218 else
219 {
220 l=length;
221 for (i=0; l > 0; i++)
222 l>>=8;
223 *(p++)=i|0x80;
224 l=i;
225 while (i-- > 0)
226 {
227 p[i]=length&0xff;
228 length>>=8;
229 }
230 p+=l;
231 }
232 *pp=p;
233 }
234
235int ASN1_object_size(int constructed, int length, int tag)
236 {
237 int ret;
238
239 ret=length;
240 ret++;
241 if (tag >= 31)
242 {
243 while (tag > 0)
244 {
245 tag>>=7;
246 ret++;
247 }
248 }
249 if ((length == 0) && (constructed == 2))
250 ret+=2;
251 ret++;
252 if (length > 127)
253 {
254 while (length > 0)
255 {
256 length>>=8;
257 ret++;
258 }
259 }
260 return(ret);
261 }
262
263int asn1_Finish(ASN1_CTX *c)
264 {
265 if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos))
266 {
267 if (!ASN1_check_infinite_end(&c->p,c->slen))
268 {
269 c->error=ERR_R_MISSING_ASN1_EOS;
270 return(0);
271 }
272 }
273 if ( ((c->slen != 0) && !(c->inf & 1)) ||
274 ((c->slen < 0) && (c->inf & 1)))
275 {
276 c->error=ERR_R_ASN1_LENGTH_MISMATCH;
277 return(0);
278 }
279 return(1);
280 }
281
282int asn1_GetSequence(ASN1_CTX *c, long *length)
283 {
284 unsigned char *q;
285
286 q=c->p;
287 c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass),
288 *length);
289 if (c->inf & 0x80)
290 {
291 c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL;
292 return(0);
293 }
294 if (c->tag != V_ASN1_SEQUENCE)
295 {
296 c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
297 return(0);
298 }
299 (*length)-=(c->p-q);
300 if (c->max && (*length < 0))
301 {
302 c->error=ERR_R_ASN1_LENGTH_MISMATCH;
303 return(0);
304 }
305 if (c->inf == (1|V_ASN1_CONSTRUCTED))
306 c->slen= *length+ *(c->pp)-c->p;
307 c->eos=0;
308 return(1);
309 }
310
311ASN1_STRING *ASN1_STRING_dup(ASN1_STRING *str)
312 {
313 ASN1_STRING *ret;
314
315 if (str == NULL) return(NULL);
316 if ((ret=ASN1_STRING_type_new(str->type)) == NULL)
317 return(NULL);
318 if (!ASN1_STRING_set(ret,str->data,str->length))
319 {
320 ASN1_STRING_free(ret);
321 return(NULL);
322 }
323 ret->flags = str->flags;
324 return(ret);
325 }
326
327int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
328 {
329 unsigned char *c;
330 const char *data=_data;
331
332 if (len < 0)
333 {
334 if (data == NULL)
335 return(0);
336 else
337 len=strlen(data);
338 }
339 if ((str->length < len) || (str->data == NULL))
340 {
341 c=str->data;
342 if (c == NULL)
343 str->data=OPENSSL_malloc(len+1);
344 else
345 str->data=OPENSSL_realloc(c,len+1);
346
347 if (str->data == NULL)
348 {
349 str->data=c;
350 return(0);
351 }
352 }
353 str->length=len;
354 if (data != NULL)
355 {
356 memcpy(str->data,data,len);
357 /* an allowance for strings :-) */
358 str->data[len]='\0';
359 }
360 return(1);
361 }
362
363ASN1_STRING *ASN1_STRING_new(void)
364 {
365 return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
366 }
367
368
369ASN1_STRING *ASN1_STRING_type_new(int type)
370 {
371 ASN1_STRING *ret;
372
373 ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
374 if (ret == NULL)
375 {
376 ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE);
377 return(NULL);
378 }
379 ret->length=0;
380 ret->type=type;
381 ret->data=NULL;
382 ret->flags=0;
383 return(ret);
384 }
385
386void ASN1_STRING_free(ASN1_STRING *a)
387 {
388 if (a == NULL) return;
389 if (a->data != NULL) OPENSSL_free(a->data);
390 OPENSSL_free(a);
391 }
392
393int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b)
394 {
395 int i;
396
397 i=(a->length-b->length);
398 if (i == 0)
399 {
400 i=memcmp(a->data,b->data,a->length);
401 if (i == 0)
402 return(a->type-b->type);
403 else
404 return(i);
405 }
406 else
407 return(i);
408 }
409
410void asn1_add_error(unsigned char *address, int offset)
411 {
412 char buf1[DECIMAL_SIZE(address)+1],buf2[DECIMAL_SIZE(offset)+1];
413
414 sprintf(buf1,"%lu",(unsigned long)address);
415 sprintf(buf2,"%d",offset);
416 ERR_add_error_data(4,"address=",buf1," offset=",buf2);
417 }
418
419int ASN1_STRING_length(ASN1_STRING *x)
420{ return M_ASN1_STRING_length(x); }
421
422void ASN1_STRING_length_set(ASN1_STRING *x, int len)
423{ M_ASN1_STRING_length_set(x, len); return; }
424
425int ASN1_STRING_type(ASN1_STRING *x)
426{ return M_ASN1_STRING_type(x); }
427
428unsigned char * ASN1_STRING_data(ASN1_STRING *x)
429{ return M_ASN1_STRING_data(x); }
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