fdfe9ea8efda48f25d20e54714256d6e933926c2
[openssl.git] / crypto / asn1 / a_bytes.c
1 /* crypto/asn1/a_bytes.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 "asn1_mac.h"
62
63 /* ASN1err(ASN1_F_D2I_ASN1_TYPE_BYTES,ASN1_R_WRONG_TYPE);
64  * ASN1err(ASN1_F_ASN1_COLLATE_PRIMATIVE,ASN1_R_WRONG_TAG);
65  */
66
67 static unsigned long tag2bit[32]={
68 0,      0,      0,      B_ASN1_BIT_STRING,      /* tags  0 -  3 */
69 B_ASN1_OCTET_STRING,    0,      0,              B_ASN1_UNKNOWN,/* tags  4- 7 */
70 B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,/* tags  8-11 */
71 B_ASN1_UTF8STRING,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,/* tags 12-15 */
72 0,      0,      B_ASN1_NUMERICSTRING,B_ASN1_PRINTABLESTRING,
73 B_ASN1_T61STRING,B_ASN1_VIDEOTEXSTRING,B_ASN1_IA5STRING,0,
74 0,B_ASN1_GRAPHICSTRING,B_ASN1_ISO64STRING,B_ASN1_GENERALSTRING,
75 B_ASN1_UNIVERSALSTRING,B_ASN1_UNKNOWN,B_ASN1_BMPSTRING,B_ASN1_UNKNOWN,
76         };
77
78 #ifndef NOPROTO
79 static int asn1_collate_primative(ASN1_STRING *a, ASN1_CTX *c);
80 #else
81 static int asn1_collate_primative();
82 #endif
83
84 /* type is a 'bitmap' of acceptable string types.
85  */
86 ASN1_STRING *d2i_ASN1_type_bytes(ASN1_STRING **a, unsigned char **pp,
87              long length, int type)
88         {
89         ASN1_STRING *ret=NULL;
90         unsigned char *p,*s;
91         long len;
92         int inf,tag,xclass;
93         int i=0;
94
95         p= *pp;
96         inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
97         if (inf & 0x80) goto err;
98
99         if (tag >= 32)
100                 {
101                 i=ASN1_R_TAG_VALUE_TOO_HIGH;;
102                 goto err;
103                 }
104         if (!(tag2bit[tag] & type))
105                 {
106                 i=ASN1_R_WRONG_TYPE;
107                 goto err;
108                 }
109
110         /* If a bit-string, exit early */
111         if (tag == V_ASN1_BIT_STRING)
112                 return(d2i_ASN1_BIT_STRING(a,pp,length));
113
114         if ((a == NULL) || ((*a) == NULL))
115                 {
116                 if ((ret=ASN1_STRING_new()) == NULL) return(NULL);
117                 }
118         else
119                 ret=(*a);
120
121         if (len != 0)
122                 {
123                 s=(unsigned char *)Malloc((int)len+1);
124                 if (s == NULL)
125                         {
126                         i=ERR_R_MALLOC_FAILURE;
127                         goto err;
128                         }
129                 memcpy(s,p,(int)len);
130                 s[len]='\0';
131                 p+=len;
132                 }
133         else
134                 s=NULL;
135
136         if (ret->data != NULL) Free((char *)ret->data);
137         ret->length=(int)len;
138         ret->data=s;
139         ret->type=tag;
140         if (a != NULL) (*a)=ret;
141         *pp=p;
142         return(ret);
143 err:
144         ASN1err(ASN1_F_D2I_ASN1_TYPE_BYTES,i);
145         if ((ret != NULL) && ((a == NULL) || (*a != ret)))
146                 ASN1_STRING_free(ret);
147         return(NULL);
148         }
149
150 int i2d_ASN1_bytes(ASN1_STRING *a, unsigned char **pp, int tag, int xclass)
151         {
152         int ret,r,constructed;
153         unsigned char *p;
154
155         if (a == NULL)  return(0);
156
157         if (tag == V_ASN1_BIT_STRING)
158                 return(i2d_ASN1_BIT_STRING(a,pp));
159                 
160         ret=a->length;
161         r=ASN1_object_size(0,ret,tag);
162         if (pp == NULL) return(r);
163         p= *pp;
164
165         if ((tag == V_ASN1_SEQUENCE) || (tag == V_ASN1_SET))
166                 constructed=1;
167         else
168                 constructed=0;
169         ASN1_put_object(&p,constructed,ret,tag,xclass);
170         memcpy(p,a->data,a->length);
171         p+=a->length;
172         *pp= p;
173         return(r);
174         }
175
176 ASN1_STRING *d2i_ASN1_bytes(ASN1_STRING **a, unsigned char **pp, long length,
177              int Ptag, int Pclass)
178         {
179         ASN1_STRING *ret=NULL;
180         unsigned char *p,*s;
181         long len;
182         int inf,tag,xclass;
183         int i=0;
184
185         if ((a == NULL) || ((*a) == NULL))
186                 {
187                 if ((ret=ASN1_STRING_new()) == NULL) return(NULL);
188                 }
189         else
190                 ret=(*a);
191
192         p= *pp;
193         inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
194         if (inf & 0x80)
195                 {
196                 i=ASN1_R_BAD_OBJECT_HEADER;
197                 goto err;
198                 }
199
200         if (tag != Ptag)
201                 {
202                 i=ASN1_R_WRONG_TAG;
203                 goto err;
204                 }
205
206         if (inf & V_ASN1_CONSTRUCTED)
207                 {
208                 ASN1_CTX c;
209
210                 c.pp=pp;
211                 c.p=p;
212                 c.inf=inf;
213                 c.slen=len;
214                 c.tag=Ptag;
215                 c.xclass=Pclass;
216                 c.max=(length == 0)?0:(p+length);
217                 if (!asn1_collate_primative(ret,&c)) 
218                         goto err; 
219                 else
220                         {
221                         p=c.p;
222                         }
223                 }
224         else
225                 {
226                 if (len != 0)
227                         {
228                         if ((ret->length < len) || (ret->data == NULL))
229                                 {
230                                 if (ret->data != NULL) Free((char *)ret->data);
231                                 s=(unsigned char *)Malloc((int)len);
232                                 if (s == NULL)
233                                         {
234                                         i=ERR_R_MALLOC_FAILURE;
235                                         goto err;
236                                         }
237                                 }
238                         else
239                                 s=ret->data;
240                         memcpy(s,p,(int)len);
241                         p+=len;
242                         }
243                 else
244                         {
245                         s=NULL;
246                         if (ret->data != NULL) Free((char *)ret->data);
247                         }
248
249                 ret->length=(int)len;
250                 ret->data=s;
251                 ret->type=Ptag;
252                 }
253
254         if (a != NULL) (*a)=ret;
255         *pp=p;
256         return(ret);
257 err:
258         if ((ret != NULL) && ((a == NULL) || (*a != ret)))
259                 ASN1_STRING_free(ret);
260         ASN1err(ASN1_F_D2I_ASN1_BYTES,i);
261         return(NULL);
262         }
263
264
265 /* We are about to parse 0..n d2i_ASN1_bytes objects, we are to collapes
266  * them into the one struture that is then returned */
267 /* There have been a few bug fixes for this function from
268  * Paul Keogh <paul.keogh@sse.ie>, many thanks to him */
269 static int asn1_collate_primative(ASN1_STRING *a, ASN1_CTX *c)
270         {
271         ASN1_STRING *os=NULL;
272         BUF_MEM b;
273         int num;
274
275         b.length=0;
276         b.max=0;
277         b.data=NULL;
278
279         if (a == NULL)
280                 {
281                 c->error=ERR_R_PASSED_NULL_PARAMETER;
282                 goto err;
283                 }
284
285         num=0;
286         for (;;)
287                 {
288                 if (c->inf & 1)
289                         {
290                         c->eos=ASN1_check_infinite_end(&c->p,
291                                 (long)(c->max-c->p));
292                         if (c->eos) break;
293                         }
294                 else
295                         {
296                         if (c->slen <= 0) break;
297                         }
298
299                 c->q=c->p;
300                 if (d2i_ASN1_bytes(&os,&c->p,c->max-c->p,c->tag,c->xclass)
301                         == NULL)
302                         {
303                         c->error=ERR_R_ASN1_LIB;
304                         goto err;
305                         }
306
307                 if (!BUF_MEM_grow(&b,num+os->length))
308                         {
309                         c->error=ERR_R_BUF_LIB;
310                         goto err;
311                         }
312                 memcpy(&(b.data[num]),os->data,os->length);
313                 if (!(c->inf & 1))
314                         c->slen-=(c->p-c->q);
315                 num+=os->length;
316                 }
317
318         if (!asn1_Finish(c)) goto err;
319
320         a->length=num;
321         if (a->data != NULL) Free(a->data);
322         a->data=(unsigned char *)b.data;
323         if (os != NULL) ASN1_STRING_free(os);
324         return(1);
325 err:
326         ASN1err(ASN1_F_ASN1_COLLATE_PRIMATIVE,c->error);
327         if (os != NULL) ASN1_STRING_free(os);
328         if (b.data != NULL) Free(b.data);
329         return(0);
330         }
331