asn1_lib.c revision 101386 
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 (*plength > (omax - (p - *pp)))
128		{
129		ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_TOO_LONG);
130		/* Set this so that even if things are not long enough
131		 * the values are set correctly */
132		ret|=0x80;
133		}
134	*pp=p;
135	return(ret|inf);
136err:
137	ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG);
138	return(0x80);
139	}
140
141static int asn1_get_length(unsigned char **pp, int *inf, long *rl, int max)
142	{
143	unsigned char *p= *pp;
144	long ret=0;
145	int i;
146
147	if (max-- < 1) return(0);
148	if (*p == 0x80)
149		{
150		*inf=1;
151		ret=0;
152		p++;
153		}
154	else
155		{
156		*inf=0;
157		i= *p&0x7f;
158		if (*(p++) & 0x80)
159			{
160			if (i > sizeof(long))
161				return 0;
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	if (ret < 0)
174		return 0;
175	*pp=p;
176	*rl=ret;
177	return(1);
178	}
179
180/* class 0 is constructed
181 * constructed == 2 for indefinite length constructed */
182void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
183	     int xclass)
184	{
185	unsigned char *p= *pp;
186	int i, ttag;
187
188	i=(constructed)?V_ASN1_CONSTRUCTED:0;
189	i|=(xclass&V_ASN1_PRIVATE);
190	if (tag < 31)
191		*(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG);
192	else
193		{
194		*(p++)=i|V_ASN1_PRIMITIVE_TAG;
195		for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7;
196		ttag = i;
197		while(i-- > 0)
198			{
199			p[i] = tag & 0x7f;
200			if(i != (ttag - 1)) p[i] |= 0x80;
201			tag >>= 7;
202			}
203		p += ttag;
204		}
205	if ((constructed == 2) && (length == 0))
206		*(p++)=0x80; /* der_put_length would output 0 instead */
207	else
208		asn1_put_length(&p,length);
209	*pp=p;
210	}
211
212static void asn1_put_length(unsigned char **pp, int length)
213	{
214	unsigned char *p= *pp;
215	int i,l;
216	if (length <= 127)
217		*(p++)=(unsigned char)length;
218	else
219		{
220		l=length;
221		for (i=0; l > 0; i++)
222			l>>=8;
223		*(p++)=i|0x80;
224		l=i;
225		while (i-- > 0)
226			{
227			p[i]=length&0xff;
228			length>>=8;
229			}
230		p+=l;
231		}
232	*pp=p;
233	}
234
235int ASN1_object_size(int constructed, int length, int tag)
236	{
237	int ret;
238
239	ret=length;
240	ret++;
241	if (tag >= 31)
242		{
243		while (tag > 0)
244			{
245			tag>>=7;
246			ret++;
247			}
248		}
249	if ((length == 0) && (constructed == 2))
250		ret+=2;
251	ret++;
252	if (length > 127)
253		{
254		while (length > 0)
255			{
256			length>>=8;
257			ret++;
258			}
259		}
260	return(ret);
261	}
262
263int asn1_Finish(ASN1_CTX *c)
264	{
265	if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos))
266		{
267		if (!ASN1_check_infinite_end(&c->p,c->slen))
268			{
269			c->error=ERR_R_MISSING_ASN1_EOS;
270			return(0);
271			}
272		}
273	if (	((c->slen != 0) && !(c->inf & 1)) ||
274		((c->slen < 0) && (c->inf & 1)))
275		{
276		c->error=ERR_R_ASN1_LENGTH_MISMATCH;
277		return(0);
278		}
279	return(1);
280	}
281
282int asn1_GetSequence(ASN1_CTX *c, long *length)
283	{
284	unsigned char *q;
285
286	q=c->p;
287	c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass),
288		*length);
289	if (c->inf & 0x80)
290		{
291		c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL;
292		return(0);
293		}
294	if (c->tag != V_ASN1_SEQUENCE)
295		{
296		c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
297		return(0);
298		}
299	(*length)-=(c->p-q);
300	if (c->max && (*length < 0))
301		{
302		c->error=ERR_R_ASN1_LENGTH_MISMATCH;
303		return(0);
304		}
305	if (c->inf == (1|V_ASN1_CONSTRUCTED))
306		c->slen= *length;
307	c->eos=0;
308	return(1);
309	}
310
311ASN1_STRING *ASN1_STRING_dup(ASN1_STRING *str)
312	{
313	ASN1_STRING *ret;
314
315	if (str == NULL) return(NULL);
316	if ((ret=ASN1_STRING_type_new(str->type)) == NULL)
317		return(NULL);
318	if (!ASN1_STRING_set(ret,str->data,str->length))
319		{
320		ASN1_STRING_free(ret);
321		return(NULL);
322		}
323	ret->flags = str->flags;
324	return(ret);
325	}
326
327int 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=OPENSSL_malloc(len+1);
344		else
345			str->data=OPENSSL_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 allowance for strings :-) */
358		str->data[len]='\0';
359		}
360	return(1);
361	}
362
363ASN1_STRING *ASN1_STRING_new(void)
364	{
365	return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
366	}
367
368
369ASN1_STRING *ASN1_STRING_type_new(int type)
370	{
371	ASN1_STRING *ret;
372
373	ret=(ASN1_STRING *)OPENSSL_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
386void ASN1_STRING_free(ASN1_STRING *a)
387	{
388	if (a == NULL) return;
389	if (a->data != NULL) OPENSSL_free(a->data);
390	OPENSSL_free(a);
391	}
392
393int 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
410void asn1_add_error(unsigned char *address, int offset)
411	{
412	char buf1[DECIMAL_SIZE(address)+1],buf2[DECIMAL_SIZE(offset)+1];
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
419int ASN1_STRING_length(ASN1_STRING *x)
420{ return M_ASN1_STRING_length(x); }
421
422void ASN1_STRING_length_set(ASN1_STRING *x, int len)
423{ M_ASN1_STRING_length_set(x, len); return; }
424
425int ASN1_STRING_type(ASN1_STRING *x)
426{ return M_ASN1_STRING_type(x); }
427
428unsigned char * ASN1_STRING_data(ASN1_STRING *x)
429{ return M_ASN1_STRING_data(x); }
430