There have been a number of complaints from a number of sources that names
[openssl.git] / crypto / asn1 / a_enum.c
1 /* crypto/asn1/a_enum.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 /* 
64  * Code for ENUMERATED type: identical to INTEGER apart from a different tag.
65  * for comments on encoding see a_int.c
66  */
67
68 ASN1_ENUMERATED *ASN1_ENUMERATED_new(void)
69 { return M_ASN1_ENUMERATED_new(); }
70
71 void ASN1_ENUMERATED_free(ASN1_ENUMERATED *x)
72 { M_ASN1_ENUMERATED_free(x); }
73
74 int i2d_ASN1_ENUMERATED(ASN1_ENUMERATED *a, unsigned char **pp)
75         {
76         int pad=0,ret,r,i,t;
77         unsigned char *p,*n,pb=0;
78
79         if ((a == NULL) || (a->data == NULL)) return(0);
80         t=a->type;
81         if (a->length == 0)
82                 ret=1;
83         else
84                 {
85                 ret=a->length;
86                 i=a->data[0];
87                 if ((t == V_ASN1_ENUMERATED) && (i > 127)) {
88                         pad=1;
89                         pb=0;
90                 } else if(t == V_ASN1_NEG_ENUMERATED) {
91                         if(i>128) {
92                                 pad=1;
93                                 pb=0xFF;
94                         } else if(i == 128) {
95                                 for(i = 1; i < a->length; i++) if(a->data[i]) {
96                                                 pad=1;
97                                                 pb=0xFF;
98                                                 break;
99                                 }
100                         }
101                 }
102                 ret+=pad;
103                 }
104         r=ASN1_object_size(0,ret,V_ASN1_ENUMERATED);
105         if (pp == NULL) return(r);
106         p= *pp;
107
108         ASN1_put_object(&p,0,ret,V_ASN1_ENUMERATED,V_ASN1_UNIVERSAL);
109         if (pad) *(p++)=pb;
110         if (a->length == 0)
111                 *(p++)=0;
112         else if (t == V_ASN1_ENUMERATED)
113                 {
114                 memcpy(p,a->data,(unsigned int)a->length);
115                 p+=a->length;
116                 }
117         else {
118                 /* Begin at the end of the encoding */
119                 n=a->data + a->length - 1;
120                 p += a->length - 1;
121                 i = a->length;
122                 /* Copy zeros to destination as long as source is zero */
123                 while(!*n) {
124                         *(p--) = 0;
125                         n--;
126                         i--;
127                 }
128                 /* Complement and increment next octet */
129                 *(p--) = ((*(n--)) ^ 0xff) + 1;
130                 i--;
131                 /* Complement any octets left */
132                 for(;i > 0; i--) *(p--) = *(n--) ^ 0xff;
133                 p += a->length;
134         }
135
136         *pp=p;
137         return(r);
138         }
139
140 ASN1_ENUMERATED *d2i_ASN1_ENUMERATED(ASN1_ENUMERATED **a, unsigned char **pp,
141              long length)
142         {
143         ASN1_ENUMERATED *ret=NULL;
144         unsigned char *p,*to,*s;
145         long len;
146         int inf,tag,xclass;
147         int i;
148
149         if ((a == NULL) || ((*a) == NULL))
150                 {
151                 if ((ret=M_ASN1_ENUMERATED_new()) == NULL) return(NULL);
152                 ret->type=V_ASN1_ENUMERATED;
153                 }
154         else
155                 ret=(*a);
156
157         p= *pp;
158         inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
159         if (inf & 0x80)
160                 {
161                 i=ASN1_R_BAD_OBJECT_HEADER;
162                 goto err;
163                 }
164
165         if (tag != V_ASN1_ENUMERATED)
166                 {
167                 i=ASN1_R_EXPECTING_AN_ENUMERATED;
168                 goto err;
169                 }
170
171         /* We must OPENSSL_malloc stuff, even for 0 bytes otherwise it
172          * signifies a missing NULL parameter. */
173         s=(unsigned char *)OPENSSL_malloc((int)len+1);
174         if (s == NULL)
175                 {
176                 i=ERR_R_MALLOC_FAILURE;
177                 goto err;
178                 }
179         to=s;
180         if(!len) {
181                 /* Strictly speaking this is an illegal ENUMERATED but we
182                  * tolerate it.
183                  */
184                 ret->type=V_ASN1_ENUMERATED;
185         } else if (*p & 0x80) /* a negative number */
186                 {
187                 ret->type=V_ASN1_NEG_ENUMERATED;
188                 if ((*p == 0xff) && (len != 1)) {
189                         p++;
190                         len--;
191                 }
192                 i = len;
193                 p += i - 1;
194                 to += i - 1;
195                 while((!*p) && i) {
196                         *(to--) = 0;
197                         i--;
198                         p--;
199                 }
200                 if(!i) {
201                         *s = 1;
202                         s[len] = 0;
203                         p += len;
204                         len++;
205                 } else {
206                         *(to--) = (*(p--) ^ 0xff) + 1;
207                         i--;
208                         for(;i > 0; i--) *(to--) = *(p--) ^ 0xff;
209                         p += len;
210                 }
211         } else {
212                 ret->type=V_ASN1_ENUMERATED;
213                 if ((*p == 0) && (len != 1))
214                         {
215                         p++;
216                         len--;
217                         }
218                 memcpy(s,p,(int)len);
219                 p+=len;
220         }
221
222         if (ret->data != NULL) OPENSSL_free(ret->data);
223         ret->data=s;
224         ret->length=(int)len;
225         if (a != NULL) (*a)=ret;
226         *pp=p;
227         return(ret);
228 err:
229         ASN1err(ASN1_F_D2I_ASN1_ENUMERATED,i);
230         if ((ret != NULL) && ((a == NULL) || (*a != ret)))
231                 M_ASN1_ENUMERATED_free(ret);
232         return(NULL);
233         }
234
235 int ASN1_ENUMERATED_set(ASN1_ENUMERATED *a, long v)
236         {
237         int i,j,k;
238         unsigned char buf[sizeof(long)+1];
239         long d;
240
241         a->type=V_ASN1_ENUMERATED;
242         if (a->length < (sizeof(long)+1))
243                 {
244                 if (a->data != NULL)
245                         OPENSSL_free(a->data);
246                 if ((a->data=(unsigned char *)OPENSSL_malloc(sizeof(long)+1)) != NULL)
247                         memset((char *)a->data,0,sizeof(long)+1);
248                 }
249         if (a->data == NULL)
250                 {
251                 ASN1err(ASN1_F_ASN1_ENUMERATED_SET,ERR_R_MALLOC_FAILURE);
252                 return(0);
253                 }
254         d=v;
255         if (d < 0)
256                 {
257                 d= -d;
258                 a->type=V_ASN1_NEG_ENUMERATED;
259                 }
260
261         for (i=0; i<sizeof(long); i++)
262                 {
263                 if (d == 0) break;
264                 buf[i]=(int)d&0xff;
265                 d>>=8;
266                 }
267         j=0;
268         for (k=i-1; k >=0; k--)
269                 a->data[j++]=buf[k];
270         a->length=j;
271         return(1);
272         }
273
274 long ASN1_ENUMERATED_get(ASN1_ENUMERATED *a)
275         {
276         int neg=0,i;
277         long r=0;
278
279         if (a == NULL) return(0L);
280         i=a->type;
281         if (i == V_ASN1_NEG_ENUMERATED)
282                 neg=1;
283         else if (i != V_ASN1_ENUMERATED)
284                 return(0);
285         
286         if (a->length > sizeof(long))
287                 {
288                 /* hmm... a bit ugly */
289                 return(0xffffffffL);
290                 }
291         if (a->data == NULL)
292                 return(0);
293
294         for (i=0; i<a->length; i++)
295                 {
296                 r<<=8;
297                 r|=(unsigned char)a->data[i];
298                 }
299         if (neg) r= -r;
300         return(r);
301         }
302
303 ASN1_ENUMERATED *BN_to_ASN1_ENUMERATED(BIGNUM *bn, ASN1_ENUMERATED *ai)
304         {
305         ASN1_ENUMERATED *ret;
306         int len,j;
307
308         if (ai == NULL)
309                 ret=M_ASN1_ENUMERATED_new();
310         else
311                 ret=ai;
312         if (ret == NULL)
313                 {
314                 ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED,ERR_R_NESTED_ASN1_ERROR);
315                 goto err;
316                 }
317         if(bn->neg) ret->type = V_ASN1_NEG_ENUMERATED;
318         else ret->type=V_ASN1_ENUMERATED;
319         j=BN_num_bits(bn);
320         len=((j == 0)?0:((j/8)+1));
321         ret->data=(unsigned char *)OPENSSL_malloc(len+4);
322         ret->length=BN_bn2bin(bn,ret->data);
323         return(ret);
324 err:
325         if (ret != ai) M_ASN1_ENUMERATED_free(ret);
326         return(NULL);
327         }
328
329 BIGNUM *ASN1_ENUMERATED_to_BN(ASN1_ENUMERATED *ai, BIGNUM *bn)
330         {
331         BIGNUM *ret;
332
333         if ((ret=BN_bin2bn(ai->data,ai->length,bn)) == NULL)
334                 ASN1err(ASN1_F_ASN1_ENUMERATED_TO_BN,ASN1_R_BN_LIB);
335         if(ai->type == V_ASN1_NEG_ENUMERATED) bn->neg = 1;
336         return(ret);
337         }