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authorcvs2svn <admin@example.com>2002-03-12 00:05:45 +0000
committercvs2svn <admin@example.com>2002-03-12 00:05:45 +0000
commit3779f2f4a8b544a7e4c362915322726b66cff114 (patch)
treeb6d77e66cbfdf6c0d8953fba2917f26f86fa50f6 /src/lib/libcrypto/asn1/a_int.c
parentf39945c2b3b0f9e4950384bdb8effdac6eed9199 (diff)
downloadopenbsd-OPENBSD_3_1_BASE.tar.gz
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This commit was manufactured by cvs2git to create tag 'OPENBSD_3_1_BASE'.OPENBSD_3_1_BASE
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diff --git a/src/lib/libcrypto/asn1/a_int.c b/src/lib/libcrypto/asn1/a_int.c
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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/* Output ASN1 INTEGER including tag+length */
76
77int i2d_ASN1_INTEGER(ASN1_INTEGER *a, unsigned char **pp)
78{
79 int len, ret;
80 if(!a) return 0;
81 len = i2c_ASN1_INTEGER(a, NULL);
82 ret=ASN1_object_size(0,len,V_ASN1_INTEGER);
83 if(pp) {
84 ASN1_put_object(pp,0,len,V_ASN1_INTEGER,V_ASN1_UNIVERSAL);
85 i2c_ASN1_INTEGER(a, pp);
86 }
87 return ret;
88}
89
90/*
91 * This converts an ASN1 INTEGER into its content encoding.
92 * The internal representation is an ASN1_STRING whose data is a big endian
93 * representation of the value, ignoring the sign. The sign is determined by
94 * the type: V_ASN1_INTEGER for positive and V_ASN1_NEG_INTEGER for negative.
95 *
96 * Positive integers are no problem: they are almost the same as the DER
97 * encoding, except if the first byte is >= 0x80 we need to add a zero pad.
98 *
99 * Negative integers are a bit trickier...
100 * The DER representation of negative integers is in 2s complement form.
101 * The internal form is converted by complementing each octet and finally
102 * adding one to the result. This can be done less messily with a little trick.
103 * If the internal form has trailing zeroes then they will become FF by the
104 * complement and 0 by the add one (due to carry) so just copy as many trailing
105 * zeros to the destination as there are in the source. The carry will add one
106 * to the last none zero octet: so complement this octet and add one and finally
107 * complement any left over until you get to the start of the string.
108 *
109 * Padding is a little trickier too. If the first bytes is > 0x80 then we pad
110 * with 0xff. However if the first byte is 0x80 and one of the following bytes
111 * is non-zero we pad with 0xff. The reason for this distinction is that 0x80
112 * followed by optional zeros isn't padded.
113 */
114
115int i2c_ASN1_INTEGER(ASN1_INTEGER *a, unsigned char **pp)
116 {
117 int pad=0,ret,i,neg;
118 unsigned char *p,*n,pb=0;
119
120 if ((a == NULL) || (a->data == NULL)) return(0);
121 neg=a->type & V_ASN1_NEG;
122 if (a->length == 0)
123 ret=1;
124 else
125 {
126 ret=a->length;
127 i=a->data[0];
128 if (!neg && (i > 127)) {
129 pad=1;
130 pb=0;
131 } else if(neg) {
132 if(i>128) {
133 pad=1;
134 pb=0xFF;
135 } else if(i == 128) {
136 /*
137 * Special case: if any other bytes non zero we pad:
138 * otherwise we don't.
139 */
140 for(i = 1; i < a->length; i++) if(a->data[i]) {
141 pad=1;
142 pb=0xFF;
143 break;
144 }
145 }
146 }
147 ret+=pad;
148 }
149 if (pp == NULL) return(ret);
150 p= *pp;
151
152 if (pad) *(p++)=pb;
153 if (a->length == 0) *(p++)=0;
154 else if (!neg) memcpy(p,a->data,(unsigned int)a->length);
155 else {
156 /* Begin at the end of the encoding */
157 n=a->data + a->length - 1;
158 p += a->length - 1;
159 i = a->length;
160 /* Copy zeros to destination as long as source is zero */
161 while(!*n) {
162 *(p--) = 0;
163 n--;
164 i--;
165 }
166 /* Complement and increment next octet */
167 *(p--) = ((*(n--)) ^ 0xff) + 1;
168 i--;
169 /* Complement any octets left */
170 for(;i > 0; i--) *(p--) = *(n--) ^ 0xff;
171 }
172
173 *pp+=ret;
174 return(ret);
175 }
176
177/* Convert DER encoded ASN1 INTEGER to ASN1_INTEGER structure */
178ASN1_INTEGER *d2i_ASN1_INTEGER(ASN1_INTEGER **a, unsigned char **pp,
179 long length)
180{
181 unsigned char *p;
182 long len;
183 int i;
184 int inf,tag,xclass;
185 ASN1_INTEGER *ret;
186
187 p= *pp;
188 inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
189 if (inf & 0x80)
190 {
191 i=ASN1_R_BAD_OBJECT_HEADER;
192 goto err;
193 }
194
195 if (tag != V_ASN1_INTEGER)
196 {
197 i=ASN1_R_EXPECTING_AN_INTEGER;
198 goto err;
199 }
200 ret = c2i_ASN1_INTEGER(a, &p, len);
201 if(ret) *pp = p;
202 return ret;
203err:
204 ASN1err(ASN1_F_D2I_ASN1_INTEGER,i);
205 return(NULL);
206
207}
208
209
210/* Convert just ASN1 INTEGER content octets to ASN1_INTEGER structure */
211
212ASN1_INTEGER *c2i_ASN1_INTEGER(ASN1_INTEGER **a, unsigned char **pp,
213 long len)
214 {
215 ASN1_INTEGER *ret=NULL;
216 unsigned char *p,*to,*s, *pend;
217 int i;
218
219 if ((a == NULL) || ((*a) == NULL))
220 {
221 if ((ret=M_ASN1_INTEGER_new()) == NULL) return(NULL);
222 ret->type=V_ASN1_INTEGER;
223 }
224 else
225 ret=(*a);
226
227 p= *pp;
228 pend = p + len;
229
230 /* We must OPENSSL_malloc stuff, even for 0 bytes otherwise it
231 * signifies a missing NULL parameter. */
232 s=(unsigned char *)OPENSSL_malloc((int)len+1);
233 if (s == NULL)
234 {
235 i=ERR_R_MALLOC_FAILURE;
236 goto err;
237 }
238 to=s;
239 if(!len) {
240 /* Strictly speaking this is an illegal INTEGER but we
241 * tolerate it.
242 */
243 ret->type=V_ASN1_INTEGER;
244 } else if (*p & 0x80) /* a negative number */
245 {
246 ret->type=V_ASN1_NEG_INTEGER;
247 if ((*p == 0xff) && (len != 1)) {
248 p++;
249 len--;
250 }
251 i = len;
252 p += i - 1;
253 to += i - 1;
254 while((!*p) && i) {
255 *(to--) = 0;
256 i--;
257 p--;
258 }
259 /* Special case: if all zeros then the number will be of
260 * the form FF followed by n zero bytes: this corresponds to
261 * 1 followed by n zero bytes. We've already written n zeros
262 * so we just append an extra one and set the first byte to
263 * a 1. This is treated separately because it is the only case
264 * where the number of bytes is larger than len.
265 */
266 if(!i) {
267 *s = 1;
268 s[len] = 0;
269 len++;
270 } else {
271 *(to--) = (*(p--) ^ 0xff) + 1;
272 i--;
273 for(;i > 0; i--) *(to--) = *(p--) ^ 0xff;
274 }
275 } else {
276 ret->type=V_ASN1_INTEGER;
277 if ((*p == 0) && (len != 1))
278 {
279 p++;
280 len--;
281 }
282 memcpy(s,p,(int)len);
283 }
284
285 if (ret->data != NULL) OPENSSL_free(ret->data);
286 ret->data=s;
287 ret->length=(int)len;
288 if (a != NULL) (*a)=ret;
289 *pp=pend;
290 return(ret);
291err:
292 ASN1err(ASN1_F_D2I_ASN1_INTEGER,i);
293 if ((ret != NULL) && ((a == NULL) || (*a != ret)))
294 M_ASN1_INTEGER_free(ret);
295 return(NULL);
296 }
297
298
299/* This is a version of d2i_ASN1_INTEGER that ignores the sign bit of
300 * ASN1 integers: some broken software can encode a positive INTEGER
301 * with its MSB set as negative (it doesn't add a padding zero).
302 */
303
304ASN1_INTEGER *d2i_ASN1_UINTEGER(ASN1_INTEGER **a, unsigned char **pp,
305 long length)
306 {
307 ASN1_INTEGER *ret=NULL;
308 unsigned char *p,*to,*s;
309 long len;
310 int inf,tag,xclass;
311 int i;
312
313 if ((a == NULL) || ((*a) == NULL))
314 {
315 if ((ret=M_ASN1_INTEGER_new()) == NULL) return(NULL);
316 ret->type=V_ASN1_INTEGER;
317 }
318 else
319 ret=(*a);
320
321 p= *pp;
322 inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
323 if (inf & 0x80)
324 {
325 i=ASN1_R_BAD_OBJECT_HEADER;
326 goto err;
327 }
328
329 if (tag != V_ASN1_INTEGER)
330 {
331 i=ASN1_R_EXPECTING_AN_INTEGER;
332 goto err;
333 }
334
335 /* We must OPENSSL_malloc stuff, even for 0 bytes otherwise it
336 * signifies a missing NULL parameter. */
337 s=(unsigned char *)OPENSSL_malloc((int)len+1);
338 if (s == NULL)
339 {
340 i=ERR_R_MALLOC_FAILURE;
341 goto err;
342 }
343 to=s;
344 ret->type=V_ASN1_INTEGER;
345 if(len) {
346 if ((*p == 0) && (len != 1))
347 {
348 p++;
349 len--;
350 }
351 memcpy(s,p,(int)len);
352 p+=len;
353 }
354
355 if (ret->data != NULL) OPENSSL_free(ret->data);
356 ret->data=s;
357 ret->length=(int)len;
358 if (a != NULL) (*a)=ret;
359 *pp=p;
360 return(ret);
361err:
362 ASN1err(ASN1_F_D2I_ASN1_UINTEGER,i);
363 if ((ret != NULL) && ((a == NULL) || (*a != ret)))
364 M_ASN1_INTEGER_free(ret);
365 return(NULL);
366 }
367
368int ASN1_INTEGER_set(ASN1_INTEGER *a, long v)
369 {
370 int i,j,k;
371 unsigned char buf[sizeof(long)+1];
372 long d;
373
374 a->type=V_ASN1_INTEGER;
375 if (a->length < (sizeof(long)+1))
376 {
377 if (a->data != NULL)
378 OPENSSL_free(a->data);
379 if ((a->data=(unsigned char *)OPENSSL_malloc(sizeof(long)+1)) != NULL)
380 memset((char *)a->data,0,sizeof(long)+1);
381 }
382 if (a->data == NULL)
383 {
384 ASN1err(ASN1_F_ASN1_INTEGER_SET,ERR_R_MALLOC_FAILURE);
385 return(0);
386 }
387 d=v;
388 if (d < 0)
389 {
390 d= -d;
391 a->type=V_ASN1_NEG_INTEGER;
392 }
393
394 for (i=0; i<sizeof(long); i++)
395 {
396 if (d == 0) break;
397 buf[i]=(int)d&0xff;
398 d>>=8;
399 }
400 j=0;
401 for (k=i-1; k >=0; k--)
402 a->data[j++]=buf[k];
403 a->length=j;
404 return(1);
405 }
406
407long ASN1_INTEGER_get(ASN1_INTEGER *a)
408 {
409 int neg=0,i;
410 long r=0;
411
412 if (a == NULL) return(0L);
413 i=a->type;
414 if (i == V_ASN1_NEG_INTEGER)
415 neg=1;
416 else if (i != V_ASN1_INTEGER)
417 return(0);
418
419 if (a->length > sizeof(long))
420 {
421 /* hmm... a bit ugly */
422 return(0xffffffffL);
423 }
424 if (a->data == NULL)
425 return(0);
426
427 for (i=0; i<a->length; i++)
428 {
429 r<<=8;
430 r|=(unsigned char)a->data[i];
431 }
432 if (neg) r= -r;
433 return(r);
434 }
435
436ASN1_INTEGER *BN_to_ASN1_INTEGER(BIGNUM *bn, ASN1_INTEGER *ai)
437 {
438 ASN1_INTEGER *ret;
439 int len,j;
440
441 if (ai == NULL)
442 ret=M_ASN1_INTEGER_new();
443 else
444 ret=ai;
445 if (ret == NULL)
446 {
447 ASN1err(ASN1_F_BN_TO_ASN1_INTEGER,ERR_R_NESTED_ASN1_ERROR);
448 goto err;
449 }
450 if(bn->neg) ret->type = V_ASN1_NEG_INTEGER;
451 else ret->type=V_ASN1_INTEGER;
452 j=BN_num_bits(bn);
453 len=((j == 0)?0:((j/8)+1));
454 ret->data=(unsigned char *)OPENSSL_malloc(len+4);
455 ret->length=BN_bn2bin(bn,ret->data);
456 return(ret);
457err:
458 if (ret != ai) M_ASN1_INTEGER_free(ret);
459 return(NULL);
460 }
461
462BIGNUM *ASN1_INTEGER_to_BN(ASN1_INTEGER *ai, BIGNUM *bn)
463 {
464 BIGNUM *ret;
465
466 if ((ret=BN_bin2bn(ai->data,ai->length,bn)) == NULL)
467 ASN1err(ASN1_F_ASN1_INTEGER_TO_BN,ASN1_R_BN_LIB);
468 else if(ai->type == V_ASN1_NEG_INTEGER) ret->neg = 1;
469 return(ret);
470 }
471
472IMPLEMENT_STACK_OF(ASN1_INTEGER)
473IMPLEMENT_ASN1_SET_OF(ASN1_INTEGER)
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-03-22 12:57:26 +0000