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(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
69int ASN1_check_infinite_end(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
83
84int ASN1_get_object(unsigned char **pp, long *plength, int *ptag, int *pclass,
85	     long omax)
86	{
87	int i,ret;
88	long l;
89	unsigned char *p= *pp;
90	int tag,xclass,inf;
91	long max=omax;
92
93	if (!max) goto err;
94	ret=(*p&V_ASN1_CONSTRUCTED);
95	xclass=(*p&V_ASN1_PRIVATE);
96	i= *p&V_ASN1_PRIMITIVE_TAG;
97	if (i == V_ASN1_PRIMITIVE_TAG)
98		{		/* high-tag */
99		p++;
100		if (--max == 0) goto err;
101		l=0;
102		while (*p&0x80)
103			{
104			l<<=7L;
105			l|= *(p++)&0x7f;
106			if (--max == 0) goto err;
107			if (l > (INT_MAX >> 7L)) goto err;
108			}
109		l<<=7L;
110		l|= *(p++)&0x7f;
111		tag=(int)l;
112		if (--max == 0) goto err;
113		}
114	else
115		{
116		tag=i;
117		p++;
118		if (--max == 0) goto err;
119		}
120	*ptag=tag;
121	*pclass=xclass;
122	if (!asn1_get_length(&p,&inf,plength,(int)max)) goto err;
123
124#if 0
125	fprintf(stderr,"p=%d + *plength=%ld > omax=%ld + *pp=%d  (%d > %d)\n",
126		(int)p,*plength,omax,(int)*pp,(int)(p+ *plength),
127		(int)(omax+ *pp));
128
129#endif
130	if (*plength > (omax - (p - *pp)))
131		{
132		ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_TOO_LONG);
133		/* Set this so that even if things are not long enough
134		 * the values are set correctly */
135		ret|=0x80;
136		}
137	*pp=p;
138	return(ret|inf);
139err:
140	ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG);
141	return(0x80);
142	}
143
144static int asn1_get_length(unsigned char **pp, int *inf, long *rl, int max)
145	{
146	unsigned char *p= *pp;
147	unsigned long ret=0;
148	int i;
149
150	if (max-- < 1) return(0);
151	if (*p == 0x80)
152		{
153		*inf=1;
154		ret=0;
155		p++;
156		}
157	else
158		{
159		*inf=0;
160		i= *p&0x7f;
161		if (*(p++) & 0x80)
162			{
163			if (i > sizeof(long))
164				return 0;
165			if (max-- == 0) return(0);
166			while (i-- > 0)
167				{
168				ret<<=8L;
169				ret|= *(p++);
170				if (max-- == 0) return(0);
171				}
172			}
173		else
174			ret=i;
175		}
176	if (ret > LONG_MAX)
177		return 0;
178	*pp=p;
179	*rl=(long)ret;
180	return(1);
181	}
182
183/* class 0 is constructed
184 * constructed == 2 for indefinite length constructed */
185void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
186	     int xclass)
187	{
188	unsigned char *p= *pp;
189	int i, ttag;
190
191	i=(constructed)?V_ASN1_CONSTRUCTED:0;
192	i|=(xclass&V_ASN1_PRIVATE);
193	if (tag < 31)
194		*(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG);
195	else
196		{
197		*(p++)=i|V_ASN1_PRIMITIVE_TAG;
198		for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7;
199		ttag = i;
200		while(i-- > 0)
201			{
202			p[i] = tag & 0x7f;
203			if(i != (ttag - 1)) p[i] |= 0x80;
204			tag >>= 7;
205			}
206		p += ttag;
207		}
208	if ((constructed == 2) && (length == 0))
209		*(p++)=0x80; /* der_put_length would output 0 instead */
210	else
211		asn1_put_length(&p,length);
212	*pp=p;
213	}
214
215static void asn1_put_length(unsigned char **pp, int length)
216	{
217	unsigned char *p= *pp;
218	int i,l;
219	if (length <= 127)
220		*(p++)=(unsigned char)length;
221	else
222		{
223		l=length;
224		for (i=0; l > 0; i++)
225			l>>=8;
226		*(p++)=i|0x80;
227		l=i;
228		while (i-- > 0)
229			{
230			p[i]=length&0xff;
231			length>>=8;
232			}
233		p+=l;
234		}
235	*pp=p;
236	}
237
238int ASN1_object_size(int constructed, int length, int tag)
239	{
240	int ret;
241
242	ret=length;
243	ret++;
244	if (tag >= 31)
245		{
246		while (tag > 0)
247			{
248			tag>>=7;
249			ret++;
250			}
251		}
252	if ((length == 0) && (constructed == 2))
253		ret+=2;
254	ret++;
255	if (length > 127)
256		{
257		while (length > 0)
258			{
259			length>>=8;
260			ret++;
261			}
262		}
263	return(ret);
264	}
265
266int asn1_Finish(ASN1_CTX *c)
267	{
268	if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos))
269		{
270		if (!ASN1_check_infinite_end(&c->p,c->slen))
271			{
272			c->error=ERR_R_MISSING_ASN1_EOS;
273			return(0);
274			}
275		}
276	if (	((c->slen != 0) && !(c->inf & 1)) ||
277		((c->slen < 0) && (c->inf & 1)))
278		{
279		c->error=ERR_R_ASN1_LENGTH_MISMATCH;
280		return(0);
281		}
282	return(1);
283	}
284
285int asn1_GetSequence(ASN1_CTX *c, long *length)
286	{
287	unsigned char *q;
288
289	q=c->p;
290	c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass),
291		*length);
292	if (c->inf & 0x80)
293		{
294		c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL;
295		return(0);
296		}
297	if (c->tag != V_ASN1_SEQUENCE)
298		{
299		c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
300		return(0);
301		}
302	(*length)-=(c->p-q);
303	if (c->max && (*length < 0))
304		{
305		c->error=ERR_R_ASN1_LENGTH_MISMATCH;
306		return(0);
307		}
308	if (c->inf == (1|V_ASN1_CONSTRUCTED))
309		c->slen= *length+ *(c->pp)-c->p;
310	c->eos=0;
311	return(1);
312	}
313
314ASN1_STRING *ASN1_STRING_dup(ASN1_STRING *str)
315	{
316	ASN1_STRING *ret;
317
318	if (str == NULL) return(NULL);
319	if ((ret=ASN1_STRING_type_new(str->type)) == NULL)
320		return(NULL);
321	if (!ASN1_STRING_set(ret,str->data,str->length))
322		{
323		ASN1_STRING_free(ret);
324		return(NULL);
325		}
326	ret->flags = str->flags;
327	return(ret);
328	}
329
330int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
331	{
332	unsigned char *c;
333	const char *data=_data;
334
335	if (len < 0)
336		{
337		if (data == NULL)
338			return(0);
339		else
340			len=strlen(data);
341		}
342	if ((str->length < len) || (str->data == NULL))
343		{
344		c=str->data;
345		if (c == NULL)
346			str->data=OPENSSL_malloc(len+1);
347		else
348			str->data=OPENSSL_realloc(c,len+1);
349
350		if (str->data == NULL)
351			{
352			ASN1err(ASN1_F_ASN1_STRING_SET,ERR_R_MALLOC_FAILURE);
353			str->data=c;
354			return(0);
355			}
356		}
357	str->length=len;
358	if (data != NULL)
359		{
360		memcpy(str->data,data,len);
361		/* an allowance for strings :-) */
362		str->data[len]='\0';
363		}
364	return(1);
365	}
366
367ASN1_STRING *ASN1_STRING_new(void)
368	{
369	return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
370	}
371
372
373ASN1_STRING *ASN1_STRING_type_new(int type)
374	{
375	ASN1_STRING *ret;
376
377	ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
378	if (ret == NULL)
379		{
380		ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE);
381		return(NULL);
382		}
383	ret->length=0;
384	ret->type=type;
385	ret->data=NULL;
386	ret->flags=0;
387	return(ret);
388	}
389
390void ASN1_STRING_free(ASN1_STRING *a)
391	{
392	if (a == NULL) return;
393	if (a->data != NULL) OPENSSL_free(a->data);
394	OPENSSL_free(a);
395	}
396
397int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b)
398	{
399	int i;
400
401	i=(a->length-b->length);
402	if (i == 0)
403		{
404		i=memcmp(a->data,b->data,a->length);
405		if (i == 0)
406			return(a->type-b->type);
407		else
408			return(i);
409		}
410	else
411		return(i);
412	}
413
414void asn1_add_error(unsigned char *address, int offset)
415	{
416	char buf1[DECIMAL_SIZE(address)+1],buf2[DECIMAL_SIZE(offset)+1];
417
418	BIO_snprintf(buf1,sizeof buf1,"%lu",(unsigned long)address);
419	BIO_snprintf(buf2,sizeof buf2,"%d",offset);
420	ERR_add_error_data(4,"address=",buf1," offset=",buf2);
421	}
422
423int ASN1_STRING_length(ASN1_STRING *x)
424{ return M_ASN1_STRING_length(x); }
425
426void ASN1_STRING_length_set(ASN1_STRING *x, int len)
427{ M_ASN1_STRING_length_set(x, len); return; }
428
429int ASN1_STRING_type(ASN1_STRING *x)
430{ return M_ASN1_STRING_type(x); }
431
432unsigned char * ASN1_STRING_data(ASN1_STRING *x)
433{ return M_ASN1_STRING_data(x); }
434