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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 "cryptlib.h"
61#include <openssl/asn1.h>
62#include <openssl/asn1_mac.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 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);
138err:
139 ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG);
140 return(0x80);
141 }
142
143static 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 */
180void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
181 int xclass)
182 {
183 unsigned char *p= *pp;
184 int i;
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 while (tag > 0x7f)
194 {
195 *(p++)=(tag&0x7f)|0x80;
196 tag>>=7;
197 }
198 *(p++)=(tag&0x7f);
199 }
200 if ((constructed == 2) && (length == 0))
201 *(p++)=0x80; /* der_put_length would output 0 instead */
202 else
203 asn1_put_length(&p,length);
204 *pp=p;
205 }
206
207static void asn1_put_length(unsigned char **pp, int length)
208 {
209 unsigned char *p= *pp;
210 int i,l;
211 if (length <= 127)
212 *(p++)=(unsigned char)length;
213 else
214 {
215 l=length;
216 for (i=0; l > 0; i++)
217 l>>=8;
218 *(p++)=i|0x80;
219 l=i;
220 while (i-- > 0)
221 {
222 p[i]=length&0xff;
223 length>>=8;
224 }
225 p+=l;
226 }
227 *pp=p;
228 }
229
230int ASN1_object_size(int constructed, int length, int tag)
231 {
232 int ret;
233
234 ret=length;
235 ret++;
236 if (tag >= 31)
237 {
238 while (tag > 0)
239 {
240 tag>>=7;
241 ret++;
242 }
243 }
244 if ((length == 0) && (constructed == 2))
245 ret+=2;
246 ret++;
247 if (length > 127)
248 {
249 while (length > 0)
250 {
251 length>>=8;
252 ret++;
253 }
254 }
255 return(ret);
256 }
257
258int asn1_Finish(ASN1_CTX *c)
259 {
260 if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos))
261 {
262 if (!ASN1_check_infinite_end(&c->p,c->slen))
263 {
264 c->error=ERR_R_MISSING_ASN1_EOS;
265 return(0);
266 }
267 }
268 if ( ((c->slen != 0) && !(c->inf & 1)) ||
269 ((c->slen < 0) && (c->inf & 1)))
270 {
271 c->error=ERR_R_ASN1_LENGTH_MISMATCH;
272 return(0);
273 }
274 return(1);
275 }
276
277int asn1_GetSequence(ASN1_CTX *c, long *length)
278 {
279 unsigned char *q;
280
281 q=c->p;
282 c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass),
283 *length);
284 if (c->inf & 0x80)
285 {
286 c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL;
287 return(0);
288 }
289 if (c->tag != V_ASN1_SEQUENCE)
290 {
291 c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
292 return(0);
293 }
294 (*length)-=(c->p-q);
295 if (c->max && (*length < 0))
296 {
297 c->error=ERR_R_ASN1_LENGTH_MISMATCH;
298 return(0);
299 }
300 if (c->inf == (1|V_ASN1_CONSTRUCTED))
301 c->slen= *length+ *(c->pp)-c->p;
302 c->eos=0;
303 return(1);
304 }
305
306ASN1_STRING *ASN1_STRING_dup(ASN1_STRING *str)
307 {
308 ASN1_STRING *ret;
309
310 if (str == NULL) return(NULL);
311 if ((ret=ASN1_STRING_type_new(str->type)) == NULL)
312 return(NULL);
313 if (!ASN1_STRING_set(ret,str->data,str->length))
314 {
315 ASN1_STRING_free(ret);
316 return(NULL);
317 }
318 ret->flags = str->flags;
319 return(ret);
320 }
321
322int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
323 {
324 unsigned char *c;
325 const char *data=_data;
326
327 if (len < 0)
328 {
329 if (data == NULL)
330 return(0);
331 else
332 len=strlen(data);
333 }
334 if ((str->length < len) || (str->data == NULL))
335 {
336 c=str->data;
337 if (c == NULL)
338 str->data=Malloc(len+1);
339 else
340 str->data=Realloc(c,len+1);
341
342 if (str->data == NULL)
343 {
344 str->data=c;
345 return(0);
346 }
347 }
348 str->length=len;
349 if (data != NULL)
350 {
351 memcpy(str->data,data,len);
352 /* an allowance for strings :-) */
353 str->data[len]='\0';
354 }
355 return(1);
356 }
357
358ASN1_STRING *ASN1_STRING_new(void)
359 {
360 return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
361 }
362
363
364ASN1_STRING *ASN1_STRING_type_new(int type)
365 {
366 ASN1_STRING *ret;
367
368 ret=(ASN1_STRING *)Malloc(sizeof(ASN1_STRING));
369 if (ret == NULL)
370 {
371 ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE);
372 return(NULL);
373 }
374 ret->length=0;
375 ret->type=type;
376 ret->data=NULL;
377 ret->flags=0;
378 return(ret);
379 }
380
381void ASN1_STRING_free(ASN1_STRING *a)
382 {
383 if (a == NULL) return;
384 if (a->data != NULL) Free(a->data);
385 Free(a);
386 }
387
388int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b)
389 {
390 int i;
391
392 i=(a->length-b->length);
393 if (i == 0)
394 {
395 i=memcmp(a->data,b->data,a->length);
396 if (i == 0)
397 return(a->type-b->type);
398 else
399 return(i);
400 }
401 else
402 return(i);
403 }
404
405void asn1_add_error(unsigned char *address, int offset)
406 {
407 char buf1[16],buf2[16];
408
409 sprintf(buf1,"%lu",(unsigned long)address);
410 sprintf(buf2,"%d",offset);
411 ERR_add_error_data(4,"address=",buf1," offset=",buf2);
412 }
413
414int ASN1_STRING_length(ASN1_STRING *x)
415{ return M_ASN1_STRING_length(x); }
416
417void ASN1_STRING_length_set(ASN1_STRING *x, int len)
418{ M_ASN1_STRING_length_set(x, len); return; }
419
420int ASN1_STRING_type(ASN1_STRING *x)
421{ return M_ASN1_STRING_type(x); }
422
423unsigned char * ASN1_STRING_data(ASN1_STRING *x)
424{ return M_ASN1_STRING_data(x); }
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