asn1_lib.c revision 76866 
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, 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
210static 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
233int 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
261int 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
280int 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;
305	c->eos=0;
306	return(1);
307	}
308
309ASN1_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
325int 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
361ASN1_STRING *ASN1_STRING_new(void)
362	{
363	return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
364	}
365
366
367ASN1_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
384void 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
391int 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
408void 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
417int ASN1_STRING_length(ASN1_STRING *x)
418{ return M_ASN1_STRING_length(x); }
419
420void ASN1_STRING_length_set(ASN1_STRING *x, int len)
421{ M_ASN1_STRING_length_set(x, len); return; }
422
423int ASN1_STRING_type(ASN1_STRING *x)
424{ return M_ASN1_STRING_type(x); }
425
426unsigned char * ASN1_STRING_data(ASN1_STRING *x)
427{ return M_ASN1_STRING_data(x); }
428