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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_dup(ASN1_INTEGER *x)
64{ return M_ASN1_INTEGER_dup(x);}
65
66int ASN1_INTEGER_cmp(ASN1_INTEGER *x, ASN1_INTEGER *y)
67{ return M_ASN1_INTEGER_cmp(x,y);}
68
69/*
70 * This converts an ASN1 INTEGER into its content encoding.
71 * The internal representation is an ASN1_STRING whose data is a big endian
72 * representation of the value, ignoring the sign. The sign is determined by
73 * the type: V_ASN1_INTEGER for positive and V_ASN1_NEG_INTEGER for negative.
74 *
75 * Positive integers are no problem: they are almost the same as the DER
76 * encoding, except if the first byte is >= 0x80 we need to add a zero pad.
77 *
78 * Negative integers are a bit trickier...
79 * The DER representation of negative integers is in 2s complement form.
80 * The internal form is converted by complementing each octet and finally
81 * adding one to the result. This can be done less messily with a little trick.
82 * If the internal form has trailing zeroes then they will become FF by the
83 * complement and 0 by the add one (due to carry) so just copy as many trailing
84 * zeros to the destination as there are in the source. The carry will add one
85 * to the last none zero octet: so complement this octet and add one and finally
86 * complement any left over until you get to the start of the string.
87 *
88 * Padding is a little trickier too. If the first bytes is > 0x80 then we pad
89 * with 0xff. However if the first byte is 0x80 and one of the following bytes
90 * is non-zero we pad with 0xff. The reason for this distinction is that 0x80
91 * followed by optional zeros isn't padded.
92 */
93
94int i2c_ASN1_INTEGER(ASN1_INTEGER *a, unsigned char **pp)
95 {
96 int pad=0,ret,i,neg;
97 unsigned char *p,*n,pb=0;
98
99 if ((a == NULL) || (a->data == NULL)) return(0);
100 neg=a->type & V_ASN1_NEG;
101 if (a->length == 0)
102 ret=1;
103 else
104 {
105 ret=a->length;
106 i=a->data[0];
107 if (!neg && (i > 127)) {
108 pad=1;
109 pb=0;
110 } else if(neg) {
111 if(i>128) {
112 pad=1;
113 pb=0xFF;
114 } else if(i == 128) {
115 /*
116 * Special case: if any other bytes non zero we pad:
117 * otherwise we don't.
118 */
119 for(i = 1; i < a->length; i++) if(a->data[i]) {
120 pad=1;
121 pb=0xFF;
122 break;
123 }
124 }
125 }
126 ret+=pad;
127 }
128 if (pp == NULL) return(ret);
129 p= *pp;
130
131 if (pad) *(p++)=pb;
132 if (a->length == 0) *(p++)=0;
133 else if (!neg) memcpy(p,a->data,(unsigned int)a->length);
134 else {
135 /* Begin at the end of the encoding */
136 n=a->data + a->length - 1;
137 p += a->length - 1;
138 i = a->length;
139 /* Copy zeros to destination as long as source is zero */
140 while(!*n) {
141 *(p--) = 0;
142 n--;
143 i--;
144 }
145 /* Complement and increment next octet */
146 *(p--) = ((*(n--)) ^ 0xff) + 1;
147 i--;
148 /* Complement any octets left */
149 for(;i > 0; i--) *(p--) = *(n--) ^ 0xff;
150 }
151
152 *pp+=ret;
153 return(ret);
154 }
155
156/* Convert just ASN1 INTEGER content octets to ASN1_INTEGER structure */
157
158ASN1_INTEGER *c2i_ASN1_INTEGER(ASN1_INTEGER **a, unsigned char **pp,
159 long len)
160 {
161 ASN1_INTEGER *ret=NULL;
162 unsigned char *p,*to,*s, *pend;
163 int i;
164
165 if ((a == NULL) || ((*a) == NULL))
166 {
167 if ((ret=M_ASN1_INTEGER_new()) == NULL) return(NULL);
168 ret->type=V_ASN1_INTEGER;
169 }
170 else
171 ret=(*a);
172
173 p= *pp;
174 pend = p + len;
175
176 /* We must OPENSSL_malloc stuff, even for 0 bytes otherwise it
177 * signifies a missing NULL parameter. */
178 s=(unsigned char *)OPENSSL_malloc((int)len+1);
179 if (s == NULL)
180 {
181 i=ERR_R_MALLOC_FAILURE;
182 goto err;
183 }
184 to=s;
185 if(!len) {
186 /* Strictly speaking this is an illegal INTEGER but we
187 * tolerate it.
188 */
189 ret->type=V_ASN1_INTEGER;
190 } else if (*p & 0x80) /* a negative number */
191 {
192 ret->type=V_ASN1_NEG_INTEGER;
193 if ((*p == 0xff) && (len != 1)) {
194 p++;
195 len--;
196 }
197 i = len;
198 p += i - 1;
199 to += i - 1;
200 while((!*p) && i) {
201 *(to--) = 0;
202 i--;
203 p--;
204 }
205 /* Special case: if all zeros then the number will be of
206 * the form FF followed by n zero bytes: this corresponds to
207 * 1 followed by n zero bytes. We've already written n zeros
208 * so we just append an extra one and set the first byte to
209 * a 1. This is treated separately because it is the only case
210 * where the number of bytes is larger than len.
211 */
212 if(!i) {
213 *s = 1;
214 s[len] = 0;
215 len++;
216 } else {
217 *(to--) = (*(p--) ^ 0xff) + 1;
218 i--;
219 for(;i > 0; i--) *(to--) = *(p--) ^ 0xff;
220 }
221 } else {
222 ret->type=V_ASN1_INTEGER;
223 if ((*p == 0) && (len != 1))
224 {
225 p++;
226 len--;
227 }
228 memcpy(s,p,(int)len);
229 }
230
231 if (ret->data != NULL) OPENSSL_free(ret->data);
232 ret->data=s;
233 ret->length=(int)len;
234 if (a != NULL) (*a)=ret;
235 *pp=pend;
236 return(ret);
237err:
238 ASN1err(ASN1_F_D2I_ASN1_INTEGER,i);
239 if ((ret != NULL) && ((a == NULL) || (*a != ret)))
240 M_ASN1_INTEGER_free(ret);
241 return(NULL);
242 }
243
244
245/* This is a version of d2i_ASN1_INTEGER that ignores the sign bit of
246 * ASN1 integers: some broken software can encode a positive INTEGER
247 * with its MSB set as negative (it doesn't add a padding zero).
248 */
249
250ASN1_INTEGER *d2i_ASN1_UINTEGER(ASN1_INTEGER **a, unsigned char **pp,
251 long length)
252 {
253 ASN1_INTEGER *ret=NULL;
254 unsigned char *p,*to,*s;
255 long len;
256 int inf,tag,xclass;
257 int i;
258
259 if ((a == NULL) || ((*a) == NULL))
260 {
261 if ((ret=M_ASN1_INTEGER_new()) == NULL) return(NULL);
262 ret->type=V_ASN1_INTEGER;
263 }
264 else
265 ret=(*a);
266
267 p= *pp;
268 inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
269 if (inf & 0x80)
270 {
271 i=ASN1_R_BAD_OBJECT_HEADER;
272 goto err;
273 }
274
275 if (tag != V_ASN1_INTEGER)
276 {
277 i=ASN1_R_EXPECTING_AN_INTEGER;
278 goto err;
279 }
280
281 /* We must OPENSSL_malloc stuff, even for 0 bytes otherwise it
282 * signifies a missing NULL parameter. */
283 s=(unsigned char *)OPENSSL_malloc((int)len+1);
284 if (s == NULL)
285 {
286 i=ERR_R_MALLOC_FAILURE;
287 goto err;
288 }
289 to=s;
290 ret->type=V_ASN1_INTEGER;
291 if(len) {
292 if ((*p == 0) && (len != 1))
293 {
294 p++;
295 len--;
296 }
297 memcpy(s,p,(int)len);
298 p+=len;
299 }
300
301 if (ret->data != NULL) OPENSSL_free(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 M_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 OPENSSL_free(a->data);
325 if ((a->data=(unsigned char *)OPENSSL_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 -1;
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=M_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 if (ret->length < len+4)
401 {
402 unsigned char *new_data=OPENSSL_realloc(ret->data, len+4);
403 if (!new_data)
404 {
405 ASN1err(ASN1_F_BN_TO_ASN1_INTEGER,ERR_R_MALLOC_FAILURE);
406 goto err;
407 }
408 ret->data=new_data;
409 }
410 ret->length=BN_bn2bin(bn,ret->data);
411 /* Correct zero case */
412 if(!ret->length)
413 {
414 ret->data[0] = 0;
415 ret->length = 1;
416 }
417 return(ret);
418err:
419 if (ret != ai) M_ASN1_INTEGER_free(ret);
420 return(NULL);
421 }
422
423BIGNUM *ASN1_INTEGER_to_BN(ASN1_INTEGER *ai, BIGNUM *bn)
424 {
425 BIGNUM *ret;
426
427 if ((ret=BN_bin2bn(ai->data,ai->length,bn)) == NULL)
428 ASN1err(ASN1_F_ASN1_INTEGER_TO_BN,ASN1_R_BN_LIB);
429 else if(ai->type == V_ASN1_NEG_INTEGER) ret->neg = 1;
430 return(ret);
431 }
432
433IMPLEMENT_STACK_OF(ASN1_INTEGER)
434IMPLEMENT_ASN1_SET_OF(ASN1_INTEGER)
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