Some more prototype fixes.
[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 <openssl/asn1.h>
62 #include <openssl/asn1_mac.h>
63
64 static int asn1_get_length(unsigned char **pp,int *inf,long *rl,int max);
65 static void asn1_put_length(unsigned char **pp, int length);
66 const char *ASN1_version="ASN.1" OPENSSL_VERSION_PTEXT;
67
68 int 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
83 int 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 0
128         if ((p+ *plength) > (omax+ *pp))
129                 {
130                 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_TOO_LONG);
131                 /* Set this so that even if things are not long enough
132                  * the values are set correctly */
133                 ret|=0x80;
134                 }
135 #endif
136         *pp=p;
137         return(ret|inf);
138 err:
139         ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG);
140         return(0x80);
141         }
142
143 static int asn1_get_length(unsigned char **pp, int *inf, long *rl, int max)
144         {
145         unsigned char *p= *pp;
146         long ret=0;
147         int i;
148
149         if (max-- < 1) return(0);
150         if (*p == 0x80)
151                 {
152                 *inf=1;
153                 ret=0;
154                 p++;
155                 }
156         else
157                 {
158                 *inf=0;
159                 i= *p&0x7f;
160                 if (*(p++) & 0x80)
161                         {
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         *pp=p;
174         *rl=ret;
175         return(1);
176         }
177
178 /* class 0 is constructed
179  * constructed == 2 for indefinite length constructed */
180 void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
181              int xclass)
182         {
183         unsigned char *p= *pp;
184         int i, ttag;
185
186         i=(constructed)?V_ASN1_CONSTRUCTED:0;
187         i|=(xclass&V_ASN1_PRIVATE);
188         if (tag < 31)
189                 *(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG);
190         else
191                 {
192                 *(p++)=i|V_ASN1_PRIMITIVE_TAG;
193                 for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7;
194                 ttag = i;
195                 while(i-- > 0)
196                         {
197                         p[i] = tag & 0x7f;
198                         if(i != (ttag - 1)) p[i] |= 0x80;
199                         tag >>= 7;
200                         }
201                 p += ttag;
202                 }
203         if ((constructed == 2) && (length == 0))
204                 *(p++)=0x80; /* der_put_length would output 0 instead */
205         else
206                 asn1_put_length(&p,length);
207         *pp=p;
208         }
209
210 static void asn1_put_length(unsigned char **pp, int length)
211         {
212         unsigned char *p= *pp;
213         int i,l;
214         if (length <= 127)
215                 *(p++)=(unsigned char)length;
216         else
217                 {
218                 l=length;
219                 for (i=0; l > 0; i++)
220                         l>>=8;
221                 *(p++)=i|0x80;
222                 l=i;
223                 while (i-- > 0)
224                         {
225                         p[i]=length&0xff;
226                         length>>=8;
227                         }
228                 p+=l;
229                 }
230         *pp=p;
231         }
232
233 int ASN1_object_size(int constructed, int length, int tag)
234         {
235         int ret;
236
237         ret=length;
238         ret++;
239         if (tag >= 31)
240                 {
241                 while (tag > 0)
242                         {
243                         tag>>=7;
244                         ret++;
245                         }
246                 }
247         if ((length == 0) && (constructed == 2))
248                 ret+=2;
249         ret++;
250         if (length > 127)
251                 {
252                 while (length > 0)
253                         {
254                         length>>=8;
255                         ret++;
256                         }
257                 }
258         return(ret);
259         }
260
261 int asn1_Finish(ASN1_CTX *c)
262         {
263         if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos))
264                 {
265                 if (!ASN1_check_infinite_end(&c->p,c->slen))
266                         {
267                         c->error=ERR_R_MISSING_ASN1_EOS;
268                         return(0);
269                         }
270                 }
271         if (    ((c->slen != 0) && !(c->inf & 1)) ||
272                 ((c->slen < 0) && (c->inf & 1)))
273                 {
274                 c->error=ERR_R_ASN1_LENGTH_MISMATCH;
275                 return(0);
276                 }
277         return(1);
278         }
279
280 int asn1_GetSequence(ASN1_CTX *c, long *length)
281         {
282         unsigned char *q;
283
284         q=c->p;
285         c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass),
286                 *length);
287         if (c->inf & 0x80)
288                 {
289                 c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL;
290                 return(0);
291                 }
292         if (c->tag != V_ASN1_SEQUENCE)
293                 {
294                 c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
295                 return(0);
296                 }
297         (*length)-=(c->p-q);
298         if (c->max && (*length < 0))
299                 {
300                 c->error=ERR_R_ASN1_LENGTH_MISMATCH;
301                 return(0);
302                 }
303         if (c->inf == (1|V_ASN1_CONSTRUCTED))
304                 c->slen= *length+ *(c->pp)-c->p;
305         c->eos=0;
306         return(1);
307         }
308
309 ASN1_STRING *ASN1_STRING_dup(ASN1_STRING *str)
310         {
311         ASN1_STRING *ret;
312
313         if (str == NULL) return(NULL);
314         if ((ret=ASN1_STRING_type_new(str->type)) == NULL)
315                 return(NULL);
316         if (!ASN1_STRING_set(ret,str->data,str->length))
317                 {
318                 ASN1_STRING_free(ret);
319                 return(NULL);
320                 }
321         ret->flags = str->flags;
322         return(ret);
323         }
324
325 int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
326         {
327         unsigned char *c;
328         const char *data=_data;
329
330         if (len < 0)
331                 {
332                 if (data == NULL)
333                         return(0);
334                 else
335                         len=strlen(data);
336                 }
337         if ((str->length < len) || (str->data == NULL))
338                 {
339                 c=str->data;
340                 if (c == NULL)
341                         str->data=OPENSSL_malloc(len+1);
342                 else
343                         str->data=OPENSSL_realloc(c,len+1);
344
345                 if (str->data == NULL)
346                         {
347                         str->data=c;
348                         return(0);
349                         }
350                 }
351         str->length=len;
352         if (data != NULL)
353                 {
354                 memcpy(str->data,data,len);
355                 /* an allowance for strings :-) */
356                 str->data[len]='\0';
357                 }
358         return(1);
359         }
360
361 ASN1_STRING *ASN1_STRING_new(void)
362         {
363         return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
364         }
365
366
367 ASN1_STRING *ASN1_STRING_type_new(int type)
368         {
369         ASN1_STRING *ret;
370
371         ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
372         if (ret == NULL)
373                 {
374                 ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE);
375                 return(NULL);
376                 }
377         ret->length=0;
378         ret->type=type;
379         ret->data=NULL;
380         ret->flags=0;
381         return(ret);
382         }
383
384 void ASN1_STRING_free(ASN1_STRING *a)
385         {
386         if (a == NULL) return;
387         if (a->data != NULL) OPENSSL_free(a->data);
388         OPENSSL_free(a);
389         }
390
391 int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b)
392         {
393         int i;
394
395         i=(a->length-b->length);
396         if (i == 0)
397                 {
398                 i=memcmp(a->data,b->data,a->length);
399                 if (i == 0)
400                         return(a->type-b->type);
401                 else
402                         return(i);
403                 }
404         else
405                 return(i);
406         }
407
408 void asn1_add_error(unsigned char *address, int offset)
409         {
410         char buf1[16],buf2[16];
411
412         sprintf(buf1,"%lu",(unsigned long)address);
413         sprintf(buf2,"%d",offset);
414         ERR_add_error_data(4,"address=",buf1," offset=",buf2);
415         }
416
417 int ASN1_STRING_length(ASN1_STRING *x)
418 { return M_ASN1_STRING_length(x); }
419
420 void ASN1_STRING_length_set(ASN1_STRING *x, int len)
421 { M_ASN1_STRING_length_set(x, len); return; }
422
423 int ASN1_STRING_type(ASN1_STRING *x)
424 { return M_ASN1_STRING_type(x); }
425
426 unsigned char * ASN1_STRING_data(ASN1_STRING *x)
427 { return M_ASN1_STRING_data(x); }