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 <openssl/asn1.h>
62
63 static int asn1_collate_primitive(ASN1_STRING *a, ASN1_const_CTX *c);
64 /* type is a 'bitmap' of acceptable string types.
65 */
66 ASN1_STRING *d2i_ASN1_type_bytes(ASN1_STRING **a, const unsigned char **pp,
67 long length, int type)
68 {
69 ASN1_STRING *ret=NULL;
70 const unsigned char *p;
71 unsigned char *s;
72 long len;
73 int inf,tag,xclass;
74 int i=0;
75
76 p= *pp;
77 inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
78 if (inf & 0x80) goto err;
79
80 if (tag >= 32)
81 {
82 i=ASN1_R_TAG_VALUE_TOO_HIGH;
83 goto err;
84 }
85 if (!(ASN1_tag2bit(tag) & type))
86 {
87 i=ASN1_R_WRONG_TYPE;
88 goto err;
89 }
90
91 /* If a bit-string, exit early */
92 if (tag == V_ASN1_BIT_STRING)
93 return(d2i_ASN1_BIT_STRING(a,pp,length));
94
95 if ((a == NULL) || ((*a) == NULL))
96 {
97 if ((ret=ASN1_STRING_new()) == NULL) return(NULL);
98 }
99 else
100 ret=(*a);
101
102 if (len != 0)
103 {
104 s=(unsigned char *)OPENSSL_malloc((int)len+1);
105 if (s == NULL)
106 {
107 i=ERR_R_MALLOC_FAILURE;
108 goto err;
109 }
110 memcpy(s,p,(int)len);
111 s[len]='\0';
112 p+=len;
113 }
114 else
115 s=NULL;
116
117 if (ret->data != NULL) OPENSSL_free(ret->data);
118 ret->length=(int)len;
119 ret->data=s;
120 ret->type=tag;
121 if (a != NULL) (*a)=ret;
122 *pp=p;
123 return(ret);
124 err:
125 ASN1err(ASN1_F_D2I_ASN1_TYPE_BYTES,i);
126 if ((ret != NULL) && ((a == NULL) || (*a != ret)))
127 ASN1_STRING_free(ret);
128 return(NULL);
129 }
130
131 int i2d_ASN1_bytes(ASN1_STRING *a, unsigned char **pp, int tag, int xclass)
132 {
133 int ret,r,constructed;
134 unsigned char *p;
135
136 if (a == NULL) return(0);
137
138 if (tag == V_ASN1_BIT_STRING)
139 return(i2d_ASN1_BIT_STRING(a,pp));
140
141 ret=a->length;
142 r=ASN1_object_size(0,ret,tag);
143 if (pp == NULL) return(r);
144 p= *pp;
145
146 if ((tag == V_ASN1_SEQUENCE) || (tag == V_ASN1_SET))
147 constructed=1;
148 else
149 constructed=0;
150 ASN1_put_object(&p,constructed,ret,tag,xclass);
151 memcpy(p,a->data,a->length);
152 p+=a->length;
153 *pp= p;
154 return(r);
155 }
156
157 ASN1_STRING *d2i_ASN1_bytes(ASN1_STRING **a, const unsigned char **pp,
158 long length, int Ptag, int Pclass)
159 {
160 ASN1_STRING *ret=NULL;
161 const unsigned char *p;
162 unsigned char *s;
163 long len;
164 int inf,tag,xclass;
165 int i=0;
166
167 if ((a == NULL) || ((*a) == NULL))
168 {
169 if ((ret=ASN1_STRING_new()) == NULL) return(NULL);
170 }
171 else
172 ret=(*a);
173
174 p= *pp;
175 inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
176 if (inf & 0x80)
177 {
178 i=ASN1_R_BAD_OBJECT_HEADER;
179 goto err;
180 }
181
182 if (tag != Ptag)
183 {
184 i=ASN1_R_WRONG_TAG;
185 goto err;
186 }
187
188 if (inf & V_ASN1_CONSTRUCTED)
189 {
190 ASN1_const_CTX c;
191
192 c.pp=pp;
193 c.p=p;
194 c.inf=inf;
195 c.slen=len;
196 c.tag=Ptag;
197 c.xclass=Pclass;
198 c.max=(length == 0)?0:(p+length);
199 if (!asn1_collate_primitive(ret,&c))
200 goto err;
201 else
202 {
203 p=c.p;
204 }
205 }
206 else
207 {
208 if (len != 0)
209 {
210 if ((ret->length < len) || (ret->data == NULL))
211 {
212 if (ret->data != NULL) OPENSSL_free(ret->data);
213 s=(unsigned char *)OPENSSL_malloc((int)len + 1);
214 if (s == NULL)
215 {
216 i=ERR_R_MALLOC_FAILURE;
217 goto err;
218 }
219 }
220 else
221 s=ret->data;
222 memcpy(s,p,(int)len);
223 s[len] = '\0';
224 p+=len;
225 }
226 else
227 {
228 s=NULL;
229 if (ret->data != NULL) OPENSSL_free(ret->data);
230 }
231
232 ret->length=(int)len;
233 ret->data=s;
234 ret->type=Ptag;
235 }
236
237 if (a != NULL) (*a)=ret;
238 *pp=p;
239 return(ret);
240 err:
241 if ((ret != NULL) && ((a == NULL) || (*a != ret)))
242 ASN1_STRING_free(ret);
243 ASN1err(ASN1_F_D2I_ASN1_BYTES,i);
244 return(NULL);
245 }
246
247
248 /* We are about to parse 0..n d2i_ASN1_bytes objects, we are to collapse
249 * them into the one structure that is then returned */
250 /* There have been a few bug fixes for this function from
251 * Paul Keogh <paul.keogh@sse.ie>, many thanks to him */
252 static int asn1_collate_primitive(ASN1_STRING *a, ASN1_const_CTX *c)
253 {
254 ASN1_STRING *os=NULL;
255 BUF_MEM b;
256 int num;
257
258 b.length=0;
259 b.max=0;
260 b.data=NULL;
261
262 if (a == NULL)
263 {
264 c->error=ERR_R_PASSED_NULL_PARAMETER;
265 goto err;
266 }
267
268 num=0;
269 for (;;)
270 {
271 if (c->inf & 1)
272 {
273 c->eos=ASN1_const_check_infinite_end(&c->p,
274 (long)(c->max-c->p));
275 if (c->eos) break;
276 }
277 else
278 {
279 if (c->slen <= 0) break;
280 }
281
282 c->q=c->p;
283 if (d2i_ASN1_bytes(&os,&c->p,c->max-c->p,c->tag,c->xclass)
284 == NULL)
285 {
286 c->error=ERR_R_ASN1_LIB;
287 goto err;
288 }
289
290 if (!BUF_MEM_grow_clean(&b,num+os->length))
291 {
292 c->error=ERR_R_BUF_LIB;
293 goto err;
294 }
295 memcpy(&(b.data[num]),os->data,os->length);
296 if (!(c->inf & 1))
297 c->slen-=(c->p-c->q);
298 num+=os->length;
299 }
300
301 if (!asn1_const_Finish(c)) goto err;
302
303 a->length=num;
304 if (a->data != NULL) OPENSSL_free(a->data);
305 a->data=(unsigned char *)b.data;
306 if (os != NULL) ASN1_STRING_free(os);
307 return(1);
308 err:
309 ASN1err(ASN1_F_ASN1_COLLATE_PRIMITIVE,c->error);
310 if (os != NULL) ASN1_STRING_free(os);
311 if (b.data != NULL) OPENSSL_free(b.data);
312 return(0);
313 }