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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
63ASN1_INTEGER *ASN1_INTEGER_new(void)
64{ return M_ASN1_INTEGER_new();}
65
66void ASN1_INTEGER_free(ASN1_INTEGER *x)
67{ M_ASN1_INTEGER_free(x);}
68
69ASN1_INTEGER *ASN1_INTEGER_dup(ASN1_INTEGER *x)
70{ return M_ASN1_INTEGER_dup(x);}
71
72int ASN1_INTEGER_cmp(ASN1_INTEGER *x, ASN1_INTEGER *y)
73{ return M_ASN1_INTEGER_cmp(x,y);}
74
75/*
76 * This converts an ASN1 INTEGER into its DER encoding.
77 * The internal representation is an ASN1_STRING whose data is a big endian
78 * representation of the value, ignoring the sign. The sign is determined by
79 * the type: V_ASN1_INTEGER for positive and V_ASN1_NEG_INTEGER for negative.
80 *
81 * Positive integers are no problem: they are almost the same as the DER
82 * encoding, except if the first byte is >= 0x80 we need to add a zero pad.
83 *
84 * Negative integers are a bit trickier...
85 * The DER representation of negative integers is in 2s complement form.
86 * The internal form is converted by complementing each octet and finally
87 * adding one to the result. This can be done less messily with a little trick.
88 * If the internal form has trailing zeroes then they will become FF by the
89 * complement and 0 by the add one (due to carry) so just copy as many trailing
90 * zeros to the destination as there are in the source. The carry will add one
91 * to the last none zero octet: so complement this octet and add one and finally
92 * complement any left over until you get to the start of the string.
93 *
94 * Padding is a little trickier too. If the first bytes is > 0x80 then we pad
95 * with 0xff. However if the first byte is 0x80 and one of the following bytes
96 * is non-zero we pad with 0xff. The reason for this distinction is that 0x80
97 * followed by optional zeros isn't padded.
98 */
99
100int i2d_ASN1_INTEGER(ASN1_INTEGER *a, unsigned char **pp)
101 {
102 int pad=0,ret,r,i,t;
103 unsigned char *p,*n,pb=0;
104
105 if ((a == NULL) || (a->data == NULL)) return(0);
106 t=a->type;
107 if (a->length == 0)
108 ret=1;
109 else
110 {
111 ret=a->length;
112 i=a->data[0];
113 if ((t == V_ASN1_INTEGER) && (i > 127)) {
114 pad=1;
115 pb=0;
116 } else if(t == V_ASN1_NEG_INTEGER) {
117 if(i>128) {
118 pad=1;
119 pb=0xFF;
120 } else if(i == 128) {
121 /*
122 * Special case: if any other bytes non zero we pad:
123 * otherwise we don't.
124 */
125 for(i = 1; i < a->length; i++) if(a->data[i]) {
126 pad=1;
127 pb=0xFF;
128 break;
129 }
130 }
131 }
132 ret+=pad;
133 }
134 r=ASN1_object_size(0,ret,V_ASN1_INTEGER);
135 if (pp == NULL) return(r);
136 p= *pp;
137
138 ASN1_put_object(&p,0,ret,V_ASN1_INTEGER,V_ASN1_UNIVERSAL);
139 if (pad) *(p++)=pb;
140 if (a->length == 0) *(p++)=0;
141 else if (t == V_ASN1_INTEGER) memcpy(p,a->data,(unsigned int)a->length);
142 else {
143 /* Begin at the end of the encoding */
144 n=a->data + a->length - 1;
145 p += a->length - 1;
146 i = a->length;
147 /* Copy zeros to destination as long as source is zero */
148 while(!*n) {
149 *(p--) = 0;
150 n--;
151 i--;
152 }
153 /* Complement and increment next octet */
154 *(p--) = ((*(n--)) ^ 0xff) + 1;
155 i--;
156 /* Complement any octets left */
157 for(;i > 0; i--) *(p--) = *(n--) ^ 0xff;
158 }
159
160 *pp+=r;
161 return(r);
162 }
163
164ASN1_INTEGER *d2i_ASN1_INTEGER(ASN1_INTEGER **a, unsigned char **pp,
165 long length)
166 {
167 ASN1_INTEGER *ret=NULL;
168 unsigned char *p,*to,*s, *pend;
169 long len;
170 int inf,tag,xclass;
171 int i;
172
173 if ((a == NULL) || ((*a) == NULL))
174 {
175 if ((ret=M_ASN1_INTEGER_new()) == NULL) return(NULL);
176 ret->type=V_ASN1_INTEGER;
177 }
178 else
179 ret=(*a);
180
181 p= *pp;
182 inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
183 pend = p + len;
184 if (inf & 0x80)
185 {
186 i=ASN1_R_BAD_OBJECT_HEADER;
187 goto err;
188 }
189
190 if (tag != V_ASN1_INTEGER)
191 {
192 i=ASN1_R_EXPECTING_AN_INTEGER;
193 goto err;
194 }
195
196 /* We must Malloc stuff, even for 0 bytes otherwise it
197 * signifies a missing NULL parameter. */
198 s=(unsigned char *)Malloc((int)len+1);
199 if (s == NULL)
200 {
201 i=ERR_R_MALLOC_FAILURE;
202 goto err;
203 }
204 to=s;
205 if(!len) {
206 /* Strictly speaking this is an illegal INTEGER but we
207 * tolerate it.
208 */
209 ret->type=V_ASN1_INTEGER;
210 } else if (*p & 0x80) /* a negative number */
211 {
212 ret->type=V_ASN1_NEG_INTEGER;
213 if ((*p == 0xff) && (len != 1)) {
214 p++;
215 len--;
216 }
217 i = len;
218 p += i - 1;
219 to += i - 1;
220 while((!*p) && i) {
221 *(to--) = 0;
222 i--;
223 p--;
224 }
225 /* Special case: if all zeros then the number will be of
226 * the form FF followed by n zero bytes: this corresponds to
227 * 1 followed by n zero bytes. We've already written n zeros
228 * so we just append an extra one and set the first byte to
229 * a 1. This is treated separately because it is the only case
230 * where the number of bytes is larger than len.
231 */
232 if(!i) {
233 *s = 1;
234 s[len] = 0;
235 len++;
236 } else {
237 *(to--) = (*(p--) ^ 0xff) + 1;
238 i--;
239 for(;i > 0; i--) *(to--) = *(p--) ^ 0xff;
240 }
241 } else {
242 ret->type=V_ASN1_INTEGER;
243 if ((*p == 0) && (len != 1))
244 {
245 p++;
246 len--;
247 }
248 memcpy(s,p,(int)len);
249 }
250
251 if (ret->data != NULL) Free(ret->data);
252 ret->data=s;
253 ret->length=(int)len;
254 if (a != NULL) (*a)=ret;
255 *pp=pend;
256 return(ret);
257err:
258 ASN1err(ASN1_F_D2I_ASN1_INTEGER,i);
259 if ((ret != NULL) && ((a == NULL) || (*a != ret)))
260 M_ASN1_INTEGER_free(ret);
261 return(NULL);
262 }
263
264/* This is a version of d2i_ASN1_INTEGER that ignores the sign bit of
265 * ASN1 integers: some broken software can encode a positive INTEGER
266 * with its MSB set as negative (it doesn't add a padding zero).
267 */
268
269ASN1_INTEGER *d2i_ASN1_UINTEGER(ASN1_INTEGER **a, unsigned char **pp,
270 long length)
271 {
272 ASN1_INTEGER *ret=NULL;
273 unsigned char *p,*to,*s;
274 long len;
275 int inf,tag,xclass;
276 int i;
277
278 if ((a == NULL) || ((*a) == NULL))
279 {
280 if ((ret=M_ASN1_INTEGER_new()) == NULL) return(NULL);
281 ret->type=V_ASN1_INTEGER;
282 }
283 else
284 ret=(*a);
285
286 p= *pp;
287 inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
288 if (inf & 0x80)
289 {
290 i=ASN1_R_BAD_OBJECT_HEADER;
291 goto err;
292 }
293
294 if (tag != V_ASN1_INTEGER)
295 {
296 i=ASN1_R_EXPECTING_AN_INTEGER;
297 goto err;
298 }
299
300 /* We must Malloc stuff, even for 0 bytes otherwise it
301 * signifies a missing NULL parameter. */
302 s=(unsigned char *)Malloc((int)len+1);
303 if (s == NULL)
304 {
305 i=ERR_R_MALLOC_FAILURE;
306 goto err;
307 }
308 to=s;
309 ret->type=V_ASN1_INTEGER;
310 if(len) {
311 if ((*p == 0) && (len != 1))
312 {
313 p++;
314 len--;
315 }
316 memcpy(s,p,(int)len);
317 p+=len;
318 }
319
320 if (ret->data != NULL) Free(ret->data);
321 ret->data=s;
322 ret->length=(int)len;
323 if (a != NULL) (*a)=ret;
324 *pp=p;
325 return(ret);
326err:
327 ASN1err(ASN1_F_D2I_ASN1_UINTEGER,i);
328 if ((ret != NULL) && ((a == NULL) || (*a != ret)))
329 M_ASN1_INTEGER_free(ret);
330 return(NULL);
331 }
332
333int ASN1_INTEGER_set(ASN1_INTEGER *a, long v)
334 {
335 int i,j,k;
336 unsigned char buf[sizeof(long)+1];
337 long d;
338
339 a->type=V_ASN1_INTEGER;
340 if (a->length < (sizeof(long)+1))
341 {
342 if (a->data != NULL)
343 Free(a->data);
344 if ((a->data=(unsigned char *)Malloc(sizeof(long)+1)) != NULL)
345 memset((char *)a->data,0,sizeof(long)+1);
346 }
347 if (a->data == NULL)
348 {
349 ASN1err(ASN1_F_ASN1_INTEGER_SET,ERR_R_MALLOC_FAILURE);
350 return(0);
351 }
352 d=v;
353 if (d < 0)
354 {
355 d= -d;
356 a->type=V_ASN1_NEG_INTEGER;
357 }
358
359 for (i=0; i<sizeof(long); i++)
360 {
361 if (d == 0) break;
362 buf[i]=(int)d&0xff;
363 d>>=8;
364 }
365 j=0;
366 for (k=i-1; k >=0; k--)
367 a->data[j++]=buf[k];
368 a->length=j;
369 return(1);
370 }
371
372long ASN1_INTEGER_get(ASN1_INTEGER *a)
373 {
374 int neg=0,i;
375 long r=0;
376
377 if (a == NULL) return(0L);
378 i=a->type;
379 if (i == V_ASN1_NEG_INTEGER)
380 neg=1;
381 else if (i != V_ASN1_INTEGER)
382 return(0);
383
384 if (a->length > sizeof(long))
385 {
386 /* hmm... a bit ugly */
387 return(0xffffffffL);
388 }
389 if (a->data == NULL)
390 return(0);
391
392 for (i=0; i<a->length; i++)
393 {
394 r<<=8;
395 r|=(unsigned char)a->data[i];
396 }
397 if (neg) r= -r;
398 return(r);
399 }
400
401ASN1_INTEGER *BN_to_ASN1_INTEGER(BIGNUM *bn, ASN1_INTEGER *ai)
402 {
403 ASN1_INTEGER *ret;
404 int len,j;
405
406 if (ai == NULL)
407 ret=M_ASN1_INTEGER_new();
408 else
409 ret=ai;
410 if (ret == NULL)
411 {
412 ASN1err(ASN1_F_BN_TO_ASN1_INTEGER,ERR_R_NESTED_ASN1_ERROR);
413 goto err;
414 }
415 if(bn->neg) ret->type = V_ASN1_NEG_INTEGER;
416 else ret->type=V_ASN1_INTEGER;
417 j=BN_num_bits(bn);
418 len=((j == 0)?0:((j/8)+1));
419 ret->data=(unsigned char *)Malloc(len+4);
420 ret->length=BN_bn2bin(bn,ret->data);
421 return(ret);
422err:
423 if (ret != ai) M_ASN1_INTEGER_free(ret);
424 return(NULL);
425 }
426
427BIGNUM *ASN1_INTEGER_to_BN(ASN1_INTEGER *ai, BIGNUM *bn)
428 {
429 BIGNUM *ret;
430
431 if ((ret=BN_bin2bn(ai->data,ai->length,bn)) == NULL)
432 ASN1err(ASN1_F_ASN1_INTEGER_TO_BN,ASN1_R_BN_LIB);
433 if(ai->type == V_ASN1_NEG_INTEGER) bn->neg = 1;
434 return(ret);
435 }
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