asn1_lib.c revision 656d9c7f52f88b3a3daccafa7655dec086c4756e 
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
65static int asn1_get_length(const unsigned char **pp,int *inf,long *rl,int max);
66static void asn1_put_length(unsigned char **pp, int length);
67const char ASN1_version[]="ASN.1" OPENSSL_VERSION_PTEXT;
68
69static 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
83int ASN1_check_infinite_end(unsigned char **p, long len)
84	{
85	return _asn1_check_infinite_end((const unsigned char **)p, len);
86	}
87
88int ASN1_const_check_infinite_end(const unsigned char **p, long len)
89	{
90	return _asn1_check_infinite_end(p, len);
91	}
92
93
94int 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);
149err:
150	ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG);
151	return(0x80);
152	}
153
154static 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 */
195void 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
225int 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
234static 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
257int 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
285static 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
304int asn1_Finish(ASN1_CTX *c)
305	{
306	return _asn1_Finish((ASN1_const_CTX *)c);
307	}
308
309int asn1_const_Finish(ASN1_const_CTX *c)
310	{
311	return _asn1_Finish(c);
312	}
313
314int 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
343ASN1_STRING *ASN1_STRING_dup(ASN1_STRING *str)
344	{
345	ASN1_STRING *ret;
346
347	if (str == NULL) return(NULL);
348	if ((ret=ASN1_STRING_type_new(str->type)) == NULL)
349		return(NULL);
350	if (!ASN1_STRING_set(ret,str->data,str->length))
351		{
352		ASN1_STRING_free(ret);
353		return(NULL);
354		}
355	ret->flags = str->flags;
356	return(ret);
357	}
358
359int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
360	{
361	unsigned char *c;
362	const char *data=_data;
363
364	if (len < 0)
365		{
366		if (data == NULL)
367			return(0);
368		else
369			len=strlen(data);
370		}
371	if ((str->length < len) || (str->data == NULL))
372		{
373		c=str->data;
374		if (c == NULL)
375			str->data=OPENSSL_malloc(len+1);
376		else
377			str->data=OPENSSL_realloc(c,len+1);
378
379		if (str->data == NULL)
380			{
381			ASN1err(ASN1_F_ASN1_STRING_SET,ERR_R_MALLOC_FAILURE);
382			str->data=c;
383			return(0);
384			}
385		}
386	str->length=len;
387	if (data != NULL)
388		{
389		memcpy(str->data,data,len);
390		/* an allowance for strings :-) */
391		str->data[len]='\0';
392		}
393	return(1);
394	}
395
396void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
397	{
398	if (str->data)
399		OPENSSL_free(str->data);
400	str->data = data;
401	str->length = len;
402	}
403
404ASN1_STRING *ASN1_STRING_new(void)
405	{
406	return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
407	}
408
409
410ASN1_STRING *ASN1_STRING_type_new(int type)
411	{
412	ASN1_STRING *ret;
413
414	ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
415	if (ret == NULL)
416		{
417		ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE);
418		return(NULL);
419		}
420	ret->length=0;
421	ret->type=type;
422	ret->data=NULL;
423	ret->flags=0;
424	return(ret);
425	}
426
427void ASN1_STRING_free(ASN1_STRING *a)
428	{
429	if (a == NULL) return;
430	if (a->data != NULL) OPENSSL_free(a->data);
431	OPENSSL_free(a);
432	}
433
434int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b)
435	{
436	int i;
437
438	i=(a->length-b->length);
439	if (i == 0)
440		{
441		i=memcmp(a->data,b->data,a->length);
442		if (i == 0)
443			return(a->type-b->type);
444		else
445			return(i);
446		}
447	else
448		return(i);
449	}
450
451void asn1_add_error(const unsigned char *address, int offset)
452	{
453	char buf1[DECIMAL_SIZE(address)+1],buf2[DECIMAL_SIZE(offset)+1];
454
455	BIO_snprintf(buf1,sizeof buf1,"%lu",(unsigned long)address);
456	BIO_snprintf(buf2,sizeof buf2,"%d",offset);
457	ERR_add_error_data(4,"address=",buf1," offset=",buf2);
458	}
459
460int ASN1_STRING_length(ASN1_STRING *x)
461{ return M_ASN1_STRING_length(x); }
462
463void ASN1_STRING_length_set(ASN1_STRING *x, int len)
464{ M_ASN1_STRING_length_set(x, len); return; }
465
466int ASN1_STRING_type(ASN1_STRING *x)
467{ return M_ASN1_STRING_type(x); }
468
469unsigned char * ASN1_STRING_data(ASN1_STRING *x)
470{ return M_ASN1_STRING_data(x); }
471