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1/* crypto/asn1/a_int.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 * This converts an ASN1 INTEGER into its DER encoding.
65 * The internal representation is an ASN1_STRING whose data is a big endian
66 * representation of the value, ignoring the sign. The sign is determined by
67 * the type: V_ASN1_INTEGER for positive and V_ASN1_NEG_INTEGER for negative.
68 *
69 * Positive integers are no problem: they are almost the same as the DER
70 * encoding, except if the first byte is >= 0x80 we need to add a zero pad.
71 *
72 * Negative integers are a bit trickier...
73 * The DER representation of negative integers is in 2s complement form.
74 * The internal form is converted by complementing each octet and finally
75 * adding one to the result. This can be done less messily with a little trick.
76 * If the internal form has trailing zeroes then they will become FF by the
77 * complement and 0 by the add one (due to carry) so just copy as many trailing
78 * zeros to the destination as there are in the source. The carry will add one
79 * to the last none zero octet: so complement this octet and add one and finally
80 * complement any left over until you get to the start of the string.
81 *
82 * Padding is a little trickier too. If the first bytes is > 0x80 then we pad
83 * with 0xff. However if the first byte is 0x80 and one of the following bytes
84 * is non-zero we pad with 0xff. The reason for this distinction is that 0x80
85 * followed by optional zeros isn't padded.
86 */
87
88int i2d_ASN1_INTEGER(ASN1_INTEGER *a, unsigned char **pp)
89 {
90 int pad=0,ret,r,i,t;
91 unsigned char *p,*n,pb=0;
92
93 if ((a == NULL) || (a->data == NULL)) return(0);
94 t=a->type;
95 if (a->length == 0)
96 ret=1;
97 else
98 {
99 ret=a->length;
100 i=a->data[0];
101 if ((t == V_ASN1_INTEGER) && (i > 127)) {
102 pad=1;
103 pb=0;
104 } else if(t == V_ASN1_NEG_INTEGER) {
105 if(i>128) {
106 pad=1;
107 pb=0xFF;
108 } else if(i == 128) {
109 /*
110 * Special case: if any other bytes non zero we pad:
111 * otherwise we don't.
112 */
113 for(i = 1; i < a->length; i++) if(a->data[i]) {
114 pad=1;
115 pb=0xFF;
116 break;
117 }
118 }
119 }
120 ret+=pad;
121 }
122 r=ASN1_object_size(0,ret,V_ASN1_INTEGER);
123 if (pp == NULL) return(r);
124 p= *pp;
125
126 ASN1_put_object(&p,0,ret,V_ASN1_INTEGER,V_ASN1_UNIVERSAL);
127 if (pad) *(p++)=pb;
128 if (a->length == 0) *(p++)=0;
129 else if (t == V_ASN1_INTEGER) memcpy(p,a->data,(unsigned int)a->length);
130 else {
131 /* Begin at the end of the encoding */
132 n=a->data + a->length - 1;
133 p += a->length - 1;
134 i = a->length;
135 /* Copy zeros to destination as long as source is zero */
136 while(!*n) {
137 *(p--) = 0;
138 n--;
139 i--;
140 }
141 /* Complement and increment next octet */
142 *(p--) = ((*(n--)) ^ 0xff) + 1;
143 i--;
144 /* Complement any octets left */
145 for(;i > 0; i--) *(p--) = *(n--) ^ 0xff;
146 }
147
148 *pp+=r;
149 return(r);
150 }
151
152ASN1_INTEGER *d2i_ASN1_INTEGER(ASN1_INTEGER **a, unsigned char **pp,
153 long length)
154 {
155 ASN1_INTEGER *ret=NULL;
156 unsigned char *p,*to,*s, *pend;
157 long len;
158 int inf,tag,xclass;
159 int i;
160
161 if ((a == NULL) || ((*a) == NULL))
162 {
163 if ((ret=ASN1_INTEGER_new()) == NULL) return(NULL);
164 ret->type=V_ASN1_INTEGER;
165 }
166 else
167 ret=(*a);
168
169 p= *pp;
170 inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
171 pend = p + len;
172 if (inf & 0x80)
173 {
174 i=ASN1_R_BAD_OBJECT_HEADER;
175 goto err;
176 }
177
178 if (tag != V_ASN1_INTEGER)
179 {
180 i=ASN1_R_EXPECTING_AN_INTEGER;
181 goto err;
182 }
183
184 /* We must Malloc stuff, even for 0 bytes otherwise it
185 * signifies a missing NULL parameter. */
186 s=(unsigned char *)Malloc((int)len+1);
187 if (s == NULL)
188 {
189 i=ERR_R_MALLOC_FAILURE;
190 goto err;
191 }
192 to=s;
193 if (*p & 0x80) /* a negative number */
194 {
195 ret->type=V_ASN1_NEG_INTEGER;
196 if ((*p == 0xff) && (len != 1)) {
197 p++;
198 len--;
199 }
200 i = len;
201 p += i - 1;
202 to += i - 1;
203 while((!*p) && i) {
204 *(to--) = 0;
205 i--;
206 p--;
207 }
208 /* Special case: if all zeros then the number will be of
209 * the form FF followed by n zero bytes: this corresponds to
210 * 1 followed by n zero bytes. We've already written n zeros
211 * so we just append an extra one and set the first byte to
212 * a 1. This is treated separately because it is the only case
213 * where the number of bytes is larger than len.
214 */
215 if(!i) {
216 *s = 1;
217 s[len] = 0;
218 len++;
219 } else {
220 *(to--) = (*(p--) ^ 0xff) + 1;
221 i--;
222 for(;i > 0; i--) *(to--) = *(p--) ^ 0xff;
223 }
224 } else {
225 ret->type=V_ASN1_INTEGER;
226 if ((*p == 0) && (len != 1))
227 {
228 p++;
229 len--;
230 }
231 memcpy(s,p,(int)len);
232 }
233
234 if (ret->data != NULL) Free((char *)ret->data);
235 ret->data=s;
236 ret->length=(int)len;
237 if (a != NULL) (*a)=ret;
238 *pp=pend;
239 return(ret);
240err:
241 ASN1err(ASN1_F_D2I_ASN1_INTEGER,i);
242 if ((ret != NULL) && ((a == NULL) || (*a != ret)))
243 ASN1_INTEGER_free(ret);
244 return(NULL);
245 }
246
247/* This is a version of d2i_ASN1_INTEGER that ignores the sign bit of
248 * ASN1 integers: some broken software can encode a positive INTEGER
249 * with its MSB set as negative (it doesn't add a padding zero).
250 */
251
252ASN1_INTEGER *d2i_ASN1_UINTEGER(ASN1_INTEGER **a, unsigned char **pp,
253 long length)
254 {
255 ASN1_INTEGER *ret=NULL;
256 unsigned char *p,*to,*s;
257 long len;
258 int inf,tag,xclass;
259 int i;
260
261 if ((a == NULL) || ((*a) == NULL))
262 {
263 if ((ret=ASN1_INTEGER_new()) == NULL) return(NULL);
264 ret->type=V_ASN1_INTEGER;
265 }
266 else
267 ret=(*a);
268
269 p= *pp;
270 inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
271 if (inf & 0x80)
272 {
273 i=ASN1_R_BAD_OBJECT_HEADER;
274 goto err;
275 }
276
277 if (tag != V_ASN1_INTEGER)
278 {
279 i=ASN1_R_EXPECTING_AN_INTEGER;
280 goto err;
281 }
282
283 /* We must Malloc stuff, even for 0 bytes otherwise it
284 * signifies a missing NULL parameter. */
285 s=(unsigned char *)Malloc((int)len+1);
286 if (s == NULL)
287 {
288 i=ERR_R_MALLOC_FAILURE;
289 goto err;
290 }
291 to=s;
292 ret->type=V_ASN1_INTEGER;
293 if ((*p == 0) && (len != 1))
294 {
295 p++;
296 len--;
297 }
298 memcpy(s,p,(int)len);
299 p+=len;
300
301 if (ret->data != NULL) Free((char *)ret->data);
302 ret->data=s;
303 ret->length=(int)len;
304 if (a != NULL) (*a)=ret;
305 *pp=p;
306 return(ret);
307err:
308 ASN1err(ASN1_F_D2I_ASN1_UINTEGER,i);
309 if ((ret != NULL) && ((a == NULL) || (*a != ret)))
310 ASN1_INTEGER_free(ret);
311 return(NULL);
312 }
313
314int ASN1_INTEGER_set(ASN1_INTEGER *a, long v)
315 {
316 int i,j,k;
317 unsigned char buf[sizeof(long)+1];
318 long d;
319
320 a->type=V_ASN1_INTEGER;
321 if (a->length < (sizeof(long)+1))
322 {
323 if (a->data != NULL)
324 Free((char *)a->data);
325 if ((a->data=(unsigned char *)Malloc(sizeof(long)+1)) != NULL)
326 memset((char *)a->data,0,sizeof(long)+1);
327 }
328 if (a->data == NULL)
329 {
330 ASN1err(ASN1_F_ASN1_INTEGER_SET,ERR_R_MALLOC_FAILURE);
331 return(0);
332 }
333 d=v;
334 if (d < 0)
335 {
336 d= -d;
337 a->type=V_ASN1_NEG_INTEGER;
338 }
339
340 for (i=0; i<sizeof(long); i++)
341 {
342 if (d == 0) break;
343 buf[i]=(int)d&0xff;
344 d>>=8;
345 }
346 j=0;
347 for (k=i-1; k >=0; k--)
348 a->data[j++]=buf[k];
349 a->length=j;
350 return(1);
351 }
352
353long ASN1_INTEGER_get(ASN1_INTEGER *a)
354 {
355 int neg=0,i;
356 long r=0;
357
358 if (a == NULL) return(0L);
359 i=a->type;
360 if (i == V_ASN1_NEG_INTEGER)
361 neg=1;
362 else if (i != V_ASN1_INTEGER)
363 return(0);
364
365 if (a->length > sizeof(long))
366 {
367 /* hmm... a bit ugly */
368 return(0xffffffffL);
369 }
370 if (a->data == NULL)
371 return(0);
372
373 for (i=0; i<a->length; i++)
374 {
375 r<<=8;
376 r|=(unsigned char)a->data[i];
377 }
378 if (neg) r= -r;
379 return(r);
380 }
381
382ASN1_INTEGER *BN_to_ASN1_INTEGER(BIGNUM *bn, ASN1_INTEGER *ai)
383 {
384 ASN1_INTEGER *ret;
385 int len,j;
386
387 if (ai == NULL)
388 ret=ASN1_INTEGER_new();
389 else
390 ret=ai;
391 if (ret == NULL)
392 {
393 ASN1err(ASN1_F_BN_TO_ASN1_INTEGER,ERR_R_NESTED_ASN1_ERROR);
394 goto err;
395 }
396 if(bn->neg) ret->type = V_ASN1_NEG_INTEGER;
397 else ret->type=V_ASN1_INTEGER;
398 j=BN_num_bits(bn);
399 len=((j == 0)?0:((j/8)+1));
400 ret->data=(unsigned char *)Malloc(len+4);
401 ret->length=BN_bn2bin(bn,ret->data);
402 return(ret);
403err:
404 if (ret != ai) ASN1_INTEGER_free(ret);
405 return(NULL);
406 }
407
408BIGNUM *ASN1_INTEGER_to_BN(ASN1_INTEGER *ai, BIGNUM *bn)
409 {
410 BIGNUM *ret;
411
412 if ((ret=BN_bin2bn(ai->data,ai->length,bn)) == NULL)
413 ASN1err(ASN1_F_ASN1_INTEGER_TO_BN,ASN1_R_BN_LIB);
414 if(ai->type == V_ASN1_NEG_INTEGER) bn->neg = 1;
415 return(ret);
416 }
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