Revert the size_t modifications from HEAD that had led to more
[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 <limits.h>
61 #include "cryptlib.h"
62 #include <openssl/asn1.h>
63 #include <openssl/asn1_mac.h>
64
65 static int asn1_get_length(const unsigned char **pp,int *inf,long *rl,int max);
66 static void asn1_put_length(unsigned char **pp, int length);
67 const char ASN1_version[]="ASN.1" OPENSSL_VERSION_PTEXT;
68
69 static int _asn1_check_infinite_end(const unsigned char **p, long len)
70         {
71         /* If there is 0 or 1 byte left, the length check should pick
72          * things up */
73         if (len <= 0)
74                 return(1);
75         else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0))
76                 {
77                 (*p)+=2;
78                 return(1);
79                 }
80         return(0);
81         }
82
83 int ASN1_check_infinite_end(unsigned char **p, long len)
84         {
85         return _asn1_check_infinite_end((const unsigned char **)p, len);
86         }
87
88 int ASN1_const_check_infinite_end(const unsigned char **p, long len)
89         {
90         return _asn1_check_infinite_end(p, len);
91         }
92
93
94 int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag,
95         int *pclass, long omax)
96         {
97         int i,ret;
98         long l;
99         const unsigned char *p= *pp;
100         int tag,xclass,inf;
101         long max=omax;
102
103         if (!max) goto err;
104         ret=(*p&V_ASN1_CONSTRUCTED);
105         xclass=(*p&V_ASN1_PRIVATE);
106         i= *p&V_ASN1_PRIMITIVE_TAG;
107         if (i == V_ASN1_PRIMITIVE_TAG)
108                 {               /* high-tag */
109                 p++;
110                 if (--max == 0) goto err;
111                 l=0;
112                 while (*p&0x80)
113                         {
114                         l<<=7L;
115                         l|= *(p++)&0x7f;
116                         if (--max == 0) goto err;
117                         if (l > (INT_MAX >> 7L)) goto err;
118                         }
119                 l<<=7L;
120                 l|= *(p++)&0x7f;
121                 tag=(int)l;
122                 if (--max == 0) goto err;
123                 }
124         else
125                 { 
126                 tag=i;
127                 p++;
128                 if (--max == 0) goto err;
129                 }
130         *ptag=tag;
131         *pclass=xclass;
132         if (!asn1_get_length(&p,&inf,plength,(int)max)) goto err;
133
134 #if 0
135         fprintf(stderr,"p=%d + *plength=%ld > omax=%ld + *pp=%d  (%d > %d)\n", 
136                 (int)p,*plength,omax,(int)*pp,(int)(p+ *plength),
137                 (int)(omax+ *pp));
138
139 #endif
140         if (*plength > (omax - (p - *pp)))
141                 {
142                 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_TOO_LONG);
143                 /* Set this so that even if things are not long enough
144                  * the values are set correctly */
145                 ret|=0x80;
146                 }
147         *pp=p;
148         return(ret|inf);
149 err:
150         ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG);
151         return(0x80);
152         }
153
154 static int asn1_get_length(const unsigned char **pp, int *inf, long *rl, int max)
155         {
156         const unsigned char *p= *pp;
157         unsigned long ret=0;
158         unsigned int i;
159
160         if (max-- < 1) return(0);
161         if (*p == 0x80)
162                 {
163                 *inf=1;
164                 ret=0;
165                 p++;
166                 }
167         else
168                 {
169                 *inf=0;
170                 i= *p&0x7f;
171                 if (*(p++) & 0x80)
172                         {
173                         if (i > sizeof(long))
174                                 return 0;
175                         if (max-- == 0) return(0);
176                         while (i-- > 0)
177                                 {
178                                 ret<<=8L;
179                                 ret|= *(p++);
180                                 if (max-- == 0) return(0);
181                                 }
182                         }
183                 else
184                         ret=i;
185                 }
186         if (ret > LONG_MAX)
187                 return 0;
188         *pp=p;
189         *rl=(long)ret;
190         return(1);
191         }
192
193 /* class 0 is constructed
194  * constructed == 2 for indefinite length constructed */
195 void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
196              int xclass)
197         {
198         unsigned char *p= *pp;
199         int i, ttag;
200
201         i=(constructed)?V_ASN1_CONSTRUCTED:0;
202         i|=(xclass&V_ASN1_PRIVATE);
203         if (tag < 31)
204                 *(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG);
205         else
206                 {
207                 *(p++)=i|V_ASN1_PRIMITIVE_TAG;
208                 for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7;
209                 ttag = i;
210                 while(i-- > 0)
211                         {
212                         p[i] = tag & 0x7f;
213                         if(i != (ttag - 1)) p[i] |= 0x80;
214                         tag >>= 7;
215                         }
216                 p += ttag;
217                 }
218         if (constructed == 2)
219                 *(p++)=0x80;
220         else
221                 asn1_put_length(&p,length);
222         *pp=p;
223         }
224
225 int ASN1_put_eoc(unsigned char **pp)
226         {
227         unsigned char *p = *pp;
228         *p++ = 0;
229         *p++ = 0;
230         *pp = p;
231         return 2;
232         }
233
234 static void asn1_put_length(unsigned char **pp, int length)
235         {
236         unsigned char *p= *pp;
237         int i,l;
238         if (length <= 127)
239                 *(p++)=(unsigned char)length;
240         else
241                 {
242                 l=length;
243                 for (i=0; l > 0; i++)
244                         l>>=8;
245                 *(p++)=i|0x80;
246                 l=i;
247                 while (i-- > 0)
248                         {
249                         p[i]=length&0xff;
250                         length>>=8;
251                         }
252                 p+=l;
253                 }
254         *pp=p;
255         }
256
257 int ASN1_object_size(int constructed, int length, int tag)
258         {
259         int ret;
260
261         ret=length;
262         ret++;
263         if (tag >= 31)
264                 {
265                 while (tag > 0)
266                         {
267                         tag>>=7;
268                         ret++;
269                         }
270                 }
271         if (constructed == 2)
272                 return ret + 3;
273         ret++;
274         if (length > 127)
275                 {
276                 while (length > 0)
277                         {
278                         length>>=8;
279                         ret++;
280                         }
281                 }
282         return(ret);
283         }
284
285 static int _asn1_Finish(ASN1_const_CTX *c)
286         {
287         if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos))
288                 {
289                 if (!ASN1_const_check_infinite_end(&c->p,c->slen))
290                         {
291                         c->error=ERR_R_MISSING_ASN1_EOS;
292                         return(0);
293                         }
294                 }
295         if (    ((c->slen != 0) && !(c->inf & 1)) ||
296                 ((c->slen < 0) && (c->inf & 1)))
297                 {
298                 c->error=ERR_R_ASN1_LENGTH_MISMATCH;
299                 return(0);
300                 }
301         return(1);
302         }
303
304 int asn1_Finish(ASN1_CTX *c)
305         {
306         return _asn1_Finish((ASN1_const_CTX *)c);
307         }
308
309 int asn1_const_Finish(ASN1_const_CTX *c)
310         {
311         return _asn1_Finish(c);
312         }
313
314 int asn1_GetSequence(ASN1_const_CTX *c, long *length)
315         {
316         const unsigned char *q;
317
318         q=c->p;
319         c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass),
320                 *length);
321         if (c->inf & 0x80)
322                 {
323                 c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL;
324                 return(0);
325                 }
326         if (c->tag != V_ASN1_SEQUENCE)
327                 {
328                 c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
329                 return(0);
330                 }
331         (*length)-=(c->p-q);
332         if (c->max && (*length < 0))
333                 {
334                 c->error=ERR_R_ASN1_LENGTH_MISMATCH;
335                 return(0);
336                 }
337         if (c->inf == (1|V_ASN1_CONSTRUCTED))
338                 c->slen= *length+ *(c->pp)-c->p;
339         c->eos=0;
340         return(1);
341         }
342
343 int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str)
344         {
345         if (str == NULL)
346                 return 0;
347         dst->type = str->type;
348         if (!ASN1_STRING_set(dst,str->data,str->length))
349                 return 0;
350         dst->flags = str->flags;
351         return 1;
352         }
353
354 ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str)
355         {
356         ASN1_STRING *ret;
357         if (!str)
358                  return NULL;
359         ret=ASN1_STRING_new();
360         if (!ret)
361                 return NULL;
362         if (!ASN1_STRING_copy(ret,str))
363                 {
364                 ASN1_STRING_free(ret);
365                 return NULL;
366                 }
367         return ret;
368         }
369
370 int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
371         {
372         unsigned char *c;
373         const char *data=_data;
374
375         if (len < 0)
376                 {
377                 if (data == NULL)
378                         return(0);
379                 else
380                         len=strlen(data);
381                 }
382         if ((str->length < len) || (str->data == NULL))
383                 {
384                 c=str->data;
385                 if (c == NULL)
386                         str->data=OPENSSL_malloc(len+1);
387                 else
388                         str->data=OPENSSL_realloc(c,len+1);
389
390                 if (str->data == NULL)
391                         {
392                         ASN1err(ASN1_F_ASN1_STRING_SET,ERR_R_MALLOC_FAILURE);
393                         str->data=c;
394                         return(0);
395                         }
396                 }
397         str->length=len;
398         if (data != NULL)
399                 {
400                 memcpy(str->data,data,len);
401                 /* an allowance for strings :-) */
402                 str->data[len]='\0';
403                 }
404         return(1);
405         }
406
407 void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
408         {
409         if (str->data)
410                 OPENSSL_free(str->data);
411         str->data = data;
412         str->length = len;
413         }
414
415 ASN1_STRING *ASN1_STRING_new(void)
416         {
417         return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
418         }
419
420
421 ASN1_STRING *ASN1_STRING_type_new(int type)
422         {
423         ASN1_STRING *ret;
424
425         ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
426         if (ret == NULL)
427                 {
428                 ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE);
429                 return(NULL);
430                 }
431         ret->length=0;
432         ret->type=type;
433         ret->data=NULL;
434         ret->flags=0;
435         return(ret);
436         }
437
438 void ASN1_STRING_free(ASN1_STRING *a)
439         {
440         if (a == NULL) return;
441         if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
442                 OPENSSL_free(a->data);
443         OPENSSL_free(a);
444         }
445
446 int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
447         {
448         int i;
449
450         i=(a->length-b->length);
451         if (i == 0)
452                 {
453                 i=memcmp(a->data,b->data,a->length);
454                 if (i == 0)
455                         return(a->type-b->type);
456                 else
457                         return(i);
458                 }
459         else
460                 return(i);
461         }
462
463 void asn1_add_error(const unsigned char *address, int offset)
464         {
465         char buf1[DECIMAL_SIZE(address)+1],buf2[DECIMAL_SIZE(offset)+1];
466
467         BIO_snprintf(buf1,sizeof buf1,"%lu",(unsigned long)address);
468         BIO_snprintf(buf2,sizeof buf2,"%d",offset);
469         ERR_add_error_data(4,"address=",buf1," offset=",buf2);
470         }
471
472 int ASN1_STRING_length(const ASN1_STRING *x)
473 { return M_ASN1_STRING_length(x); }
474
475 void ASN1_STRING_length_set(ASN1_STRING *x, int len)
476 { M_ASN1_STRING_length_set(x, len); return; }
477
478 int ASN1_STRING_type(ASN1_STRING *x)
479 { return M_ASN1_STRING_type(x); }
480
481 unsigned char * ASN1_STRING_data(ASN1_STRING *x)
482 { return M_ASN1_STRING_data(x); }