f67ed0fc8663c861e323d20cf4f0a24eca4d1465
[openssl.git] / crypto / asn1 / asn1_lib.c
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 "cryptlib.h"
61 #include "asn1.h"
62 #include "asn1_mac.h"
63
64 #ifndef NOPROTO
65 static int asn1_get_length(unsigned char **pp,int *inf,long *rl,int max);
66 static void asn1_put_length(unsigned char **pp, int length);
67 #else
68 static int asn1_get_length();
69 static void asn1_put_length();
70 #endif
71
72 const char *ASN1_version="ASN.1" OPENSSL_VERSION_PTEXT;
73
74 int ASN1_check_infinite_end(unsigned char **p, long len)
75         {
76         /* If there is 0 or 1 byte left, the length check should pick
77          * things up */
78         if (len <= 0)
79                 return(1);
80         else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0))
81                 {
82                 (*p)+=2;
83                 return(1);
84                 }
85         return(0);
86         }
87
88
89 int ASN1_get_object(unsigned char **pp, long *plength, int *ptag, int *pclass,
90              long omax)
91         {
92         int i,ret;
93         long l;
94         unsigned char *p= *pp;
95         int tag,xclass,inf;
96         long max=omax;
97
98         if (!max) goto err;
99         ret=(*p&V_ASN1_CONSTRUCTED);
100         xclass=(*p&V_ASN1_PRIVATE);
101         i= *p&V_ASN1_PRIMATIVE_TAG;
102         if (i == V_ASN1_PRIMATIVE_TAG)
103                 {               /* high-tag */
104                 p++;
105                 if (--max == 0) goto err;
106                 l=0;
107                 while (*p&0x80)
108                         {
109                         l<<=7L;
110                         l|= *(p++)&0x7f;
111                         if (--max == 0) goto err;
112                         }
113                 l<<=7L;
114                 l|= *(p++)&0x7f;
115                 tag=(int)l;
116                 }
117         else
118                 { 
119                 tag=i;
120                 p++;
121                 if (--max == 0) goto err;
122                 }
123         *ptag=tag;
124         *pclass=xclass;
125         if (!asn1_get_length(&p,&inf,plength,(int)max)) goto err;
126
127 #if 0
128         fprintf(stderr,"p=%d + *plength=%ld > omax=%ld + *pp=%d  (%d > %d)\n", 
129                 (int)p,*plength,omax,(int)*pp,(int)(p+ *plength),
130                 (int)(omax+ *pp));
131
132 #endif
133 #if 0
134         if ((p+ *plength) > (omax+ *pp))
135                 {
136                 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_TOO_LONG);
137                 /* Set this so that even if things are not long enough
138                  * the values are set correctly */
139                 ret|=0x80;
140                 }
141 #endif
142         *pp=p;
143         return(ret|inf);
144 err:
145         ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG);
146         return(0x80);
147         }
148
149 static int asn1_get_length(unsigned char **pp, int *inf, long *rl, int max)
150         {
151         unsigned char *p= *pp;
152         long ret=0;
153         int i;
154
155         if (max-- < 1) return(0);
156         if (*p == 0x80)
157                 {
158                 *inf=1;
159                 ret=0;
160                 p++;
161                 }
162         else
163                 {
164                 *inf=0;
165                 i= *p&0x7f;
166                 if (*(p++) & 0x80)
167                         {
168                         if (max-- == 0) return(0);
169                         while (i-- > 0)
170                                 {
171                                 ret<<=8L;
172                                 ret|= *(p++);
173                                 if (max-- == 0) return(0);
174                                 }
175                         }
176                 else
177                         ret=i;
178                 }
179         *pp=p;
180         *rl=ret;
181         return(1);
182         }
183
184 /* class 0 is constructed
185  * constructed == 2 for indefinitle length constructed */
186 void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
187              int xclass)
188         {
189         unsigned char *p= *pp;
190         int i;
191
192         i=(constructed)?V_ASN1_CONSTRUCTED:0;
193         i|=(xclass&V_ASN1_PRIVATE);
194         if (tag < 31)
195                 *(p++)=i|(tag&V_ASN1_PRIMATIVE_TAG);
196         else
197                 {
198                 *(p++)=i|V_ASN1_PRIMATIVE_TAG;
199                 while (tag > 0x7f)
200                         {
201                         *(p++)=(tag&0x7f)|0x80;
202                         tag>>=7;
203                         }
204                 *(p++)=(tag&0x7f);
205                 }
206         if ((constructed == 2) && (length == 0))
207                 *(p++)=0x80; /* der_put_length would output 0 instead */
208         else
209                 asn1_put_length(&p,length);
210         *pp=p;
211         }
212
213 static void asn1_put_length(unsigned char **pp, int length)
214         {
215         unsigned char *p= *pp;
216         int i,l;
217         if (length <= 127)
218                 *(p++)=(unsigned char)length;
219         else
220                 {
221                 l=length;
222                 for (i=0; l > 0; i++)
223                         l>>=8;
224                 *(p++)=i|0x80;
225                 l=i;
226                 while (i-- > 0)
227                         {
228                         p[i]=length&0xff;
229                         length>>=8;
230                         }
231                 p+=l;
232                 }
233         *pp=p;
234         }
235
236 int ASN1_object_size(int constructed, int length, int tag)
237         {
238         int ret;
239
240         ret=length;
241         ret++;
242         if (tag >= 31)
243                 {
244                 while (tag > 0)
245                         {
246                         tag>>=7;
247                         ret++;
248                         }
249                 }
250         if ((length == 0) && (constructed == 2))
251                 ret+=2;
252         ret++;
253         if (length > 127)
254                 {
255                 while (length > 0)
256                         {
257                         length>>=8;
258                         ret++;
259                         }
260                 }
261         return(ret);
262         }
263
264 int asn1_Finish(ASN1_CTX *c)
265         {
266         if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos))
267                 {
268                 if (!ASN1_check_infinite_end(&c->p,c->slen))
269                         {
270                         c->error=ERR_R_MISSING_ASN1_EOS;
271                         return(0);
272                         }
273                 }
274         if (    ((c->slen != 0) && !(c->inf & 1)) ||
275                 ((c->slen < 0) && (c->inf & 1)))
276                 {
277                 c->error=ERR_R_ASN1_LENGTH_MISMATCH;
278                 return(0);
279                 }
280         return(1);
281         }
282
283 int asn1_GetSequence(ASN1_CTX *c, long *length)
284         {
285         unsigned char *q;
286
287         q=c->p;
288         c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass),
289                 *length);
290         if (c->inf & 0x80)
291                 {
292                 c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL;
293                 return(0);
294                 }
295         if (c->tag != V_ASN1_SEQUENCE)
296                 {
297                 c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
298                 return(0);
299                 }
300         (*length)-=(c->p-q);
301         if (c->max && (*length < 0))
302                 {
303                 c->error=ERR_R_ASN1_LENGTH_MISMATCH;
304                 return(0);
305                 }
306         if (c->inf == (1|V_ASN1_CONSTRUCTED))
307                 c->slen= *length+ *(c->pp)-c->p;
308         c->eos=0;
309         return(1);
310         }
311
312 ASN1_STRING *ASN1_STRING_dup(ASN1_STRING *str)
313         {
314         ASN1_STRING *ret;
315
316         if (str == NULL) return(NULL);
317         if ((ret=ASN1_STRING_type_new(str->type)) == NULL)
318                 return(NULL);
319         if (!ASN1_STRING_set(ret,str->data,str->length))
320                 {
321                 ASN1_STRING_free(ret);
322                 return(NULL);
323                 }
324         return(ret);
325         }
326
327 int 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=Malloc(len+1);
344                 else
345                         str->data=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 alowance for strings :-) */
358                 str->data[len]='\0';
359                 }
360         return(1);
361         }
362
363 ASN1_STRING *ASN1_STRING_new(void)
364         {
365         return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
366         }
367
368
369 ASN1_STRING *ASN1_STRING_type_new(int type)
370         {
371         ASN1_STRING *ret;
372
373         ret=(ASN1_STRING *)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
386 void ASN1_STRING_free(ASN1_STRING *a)
387         {
388         if (a == NULL) return;
389         if (a->data != NULL) Free((char *)a->data);
390         Free((char *)a);
391         }
392
393 int 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
410 void asn1_add_error(unsigned char *address, int offset)
411         {
412         char buf1[16],buf2[16];
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