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1/* $OpenBSD: a_int.c,v 1.30 2015/09/30 17:30:15 jsing Exp $ */
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 <string.h>
61
62#include <openssl/asn1.h>
63#include <openssl/bn.h>
64#include <openssl/err.h>
65
66ASN1_INTEGER *
67ASN1_INTEGER_dup(const ASN1_INTEGER *x)
68{
69 return ASN1_STRING_dup(x);
70}
71
72int
73ASN1_INTEGER_cmp(const ASN1_INTEGER *x, const ASN1_INTEGER *y)
74{
75 int neg, ret;
76
77 /* Compare signs */
78 neg = x->type & V_ASN1_NEG;
79 if (neg != (y->type & V_ASN1_NEG)) {
80 if (neg)
81 return -1;
82 else
83 return 1;
84 }
85
86 ret = ASN1_STRING_cmp(x, y);
87
88 if (neg)
89 return -ret;
90 else
91 return ret;
92}
93
94
95/*
96 * This converts an ASN1 INTEGER into its content encoding.
97 * The internal representation is an ASN1_STRING whose data is a big endian
98 * representation of the value, ignoring the sign. The sign is determined by
99 * the type: V_ASN1_INTEGER for positive and V_ASN1_NEG_INTEGER for negative.
100 *
101 * Positive integers are no problem: they are almost the same as the DER
102 * encoding, except if the first byte is >= 0x80 we need to add a zero pad.
103 *
104 * Negative integers are a bit trickier...
105 * The DER representation of negative integers is in 2s complement form.
106 * The internal form is converted by complementing each octet and finally
107 * adding one to the result. This can be done less messily with a little trick.
108 * If the internal form has trailing zeroes then they will become FF by the
109 * complement and 0 by the add one (due to carry) so just copy as many trailing
110 * zeros to the destination as there are in the source. The carry will add one
111 * to the last none zero octet: so complement this octet and add one and finally
112 * complement any left over until you get to the start of the string.
113 *
114 * Padding is a little trickier too. If the first bytes is > 0x80 then we pad
115 * with 0xff. However if the first byte is 0x80 and one of the following bytes
116 * is non-zero we pad with 0xff. The reason for this distinction is that 0x80
117 * followed by optional zeros isn't padded.
118 */
119
120int
121i2c_ASN1_INTEGER(ASN1_INTEGER *a, unsigned char **pp)
122{
123 int pad = 0, ret, i, neg;
124 unsigned char *p, *n, pb = 0;
125
126 if (a == NULL)
127 return (0);
128 neg = a->type & V_ASN1_NEG;
129 if (a->length == 0)
130 ret = 1;
131 else {
132 ret = a->length;
133 i = a->data[0];
134 if (!neg && (i > 127)) {
135 pad = 1;
136 pb = 0;
137 } else if (neg) {
138 if (i > 128) {
139 pad = 1;
140 pb = 0xFF;
141 } else if (i == 128) {
142 /*
143 * Special case: if any other bytes non zero we pad:
144 * otherwise we don't.
145 */
146 for (i = 1; i < a->length; i++) if (a->data[i]) {
147 pad = 1;
148 pb = 0xFF;
149 break;
150 }
151 }
152 }
153 ret += pad;
154 }
155 if (pp == NULL)
156 return (ret);
157 p= *pp;
158
159 if (pad)
160 *(p++) = pb;
161 if (a->length == 0)
162 *(p++) = 0;
163 else if (!neg)
164 memcpy(p, a->data, a->length);
165 else {
166 /* Begin at the end of the encoding */
167 n = a->data + a->length - 1;
168 p += a->length - 1;
169 i = a->length;
170 /* Copy zeros to destination as long as source is zero */
171 while (!*n) {
172 *(p--) = 0;
173 n--;
174 i--;
175 }
176 /* Complement and increment next octet */
177 *(p--) = ((*(n--)) ^ 0xff) + 1;
178 i--;
179 /* Complement any octets left */
180 for (; i > 0; i--)
181 *(p--) = *(n--) ^ 0xff;
182 }
183
184 *pp += ret;
185 return (ret);
186}
187
188/* Convert just ASN1 INTEGER content octets to ASN1_INTEGER structure */
189
190ASN1_INTEGER *
191c2i_ASN1_INTEGER(ASN1_INTEGER **a, const unsigned char **pp, long len)
192{
193 ASN1_INTEGER *ret = NULL;
194 const unsigned char *p, *pend;
195 unsigned char *to, *s;
196 int i;
197
198 if ((a == NULL) || ((*a) == NULL)) {
199 if ((ret = ASN1_INTEGER_new()) == NULL)
200 return (NULL);
201 } else
202 ret = (*a);
203
204 p = *pp;
205 pend = p + len;
206
207 /* We must malloc stuff, even for 0 bytes otherwise it
208 * signifies a missing NULL parameter. */
209 s = malloc(len + 1);
210 if (s == NULL) {
211 i = ERR_R_MALLOC_FAILURE;
212 goto err;
213 }
214 to = s;
215 if (!len) {
216 /* Strictly speaking this is an illegal INTEGER but we
217 * tolerate it.
218 */
219 ret->type = V_ASN1_INTEGER;
220 } else if (*p & 0x80) /* a negative number */ {
221 ret->type = V_ASN1_NEG_INTEGER;
222 if ((*p == 0xff) && (len != 1)) {
223 p++;
224 len--;
225 }
226 i = len;
227 p += i - 1;
228 to += i - 1;
229 while((!*p) && i) {
230 *(to--) = 0;
231 i--;
232 p--;
233 }
234 /* Special case: if all zeros then the number will be of
235 * the form FF followed by n zero bytes: this corresponds to
236 * 1 followed by n zero bytes. We've already written n zeros
237 * so we just append an extra one and set the first byte to
238 * a 1. This is treated separately because it is the only case
239 * where the number of bytes is larger than len.
240 */
241 if (!i) {
242 *s = 1;
243 s[len] = 0;
244 len++;
245 } else {
246 *(to--) = (*(p--) ^ 0xff) + 1;
247 i--;
248 for (; i > 0; i--)
249 *(to--) = *(p--) ^ 0xff;
250 }
251 } else {
252 ret->type = V_ASN1_INTEGER;
253 if ((*p == 0) && (len != 1)) {
254 p++;
255 len--;
256 }
257 memcpy(s, p, len);
258 }
259
260 free(ret->data);
261 ret->data = s;
262 ret->length = (int)len;
263 if (a != NULL)
264 (*a) = ret;
265 *pp = pend;
266 return (ret);
267
268err:
269 ASN1err(ASN1_F_C2I_ASN1_INTEGER, i);
270 if (a == NULL || *a != ret)
271 ASN1_INTEGER_free(ret);
272 return (NULL);
273}
274
275
276/* This is a version of d2i_ASN1_INTEGER that ignores the sign bit of
277 * ASN1 integers: some broken software can encode a positive INTEGER
278 * with its MSB set as negative (it doesn't add a padding zero).
279 */
280
281ASN1_INTEGER *
282d2i_ASN1_UINTEGER(ASN1_INTEGER **a, const unsigned char **pp, long length)
283{
284 ASN1_INTEGER *ret = NULL;
285 const unsigned char *p;
286 unsigned char *s;
287 long len;
288 int inf, tag, xclass;
289 int i;
290
291 if ((a == NULL) || ((*a) == NULL)) {
292 if ((ret = ASN1_INTEGER_new()) == NULL)
293 return (NULL);
294 } else
295 ret = (*a);
296
297 p = *pp;
298 inf = ASN1_get_object(&p, &len, &tag, &xclass, length);
299 if (inf & 0x80) {
300 i = ASN1_R_BAD_OBJECT_HEADER;
301 goto err;
302 }
303
304 if (tag != V_ASN1_INTEGER) {
305 i = ASN1_R_EXPECTING_AN_INTEGER;
306 goto err;
307 }
308
309 /* We must malloc stuff, even for 0 bytes otherwise it
310 * signifies a missing NULL parameter. */
311 s = malloc(len + 1);
312 if (s == NULL) {
313 i = ERR_R_MALLOC_FAILURE;
314 goto err;
315 }
316 ret->type = V_ASN1_INTEGER;
317 if (len) {
318 if ((*p == 0) && (len != 1)) {
319 p++;
320 len--;
321 }
322 memcpy(s, p, len);
323 p += len;
324 }
325
326 free(ret->data);
327 ret->data = s;
328 ret->length = (int)len;
329 if (a != NULL)
330 (*a) = ret;
331 *pp = p;
332 return (ret);
333
334err:
335 ASN1err(ASN1_F_D2I_ASN1_UINTEGER, i);
336 if (a == NULL || *a != ret)
337 ASN1_INTEGER_free(ret);
338 return (NULL);
339}
340
341int
342ASN1_INTEGER_set(ASN1_INTEGER *a, long v)
343{
344 int j, k;
345 unsigned int i;
346 unsigned char buf[sizeof(long) + 1];
347 long d;
348
349 a->type = V_ASN1_INTEGER;
350 /* XXX ssl/ssl_asn1.c:i2d_SSL_SESSION() depends upon this bound vae */
351 if (a->length < (int)(sizeof(long) + 1)) {
352 free(a->data);
353 a->data = calloc(1, sizeof(long) + 1);
354 }
355 if (a->data == NULL) {
356 ASN1err(ASN1_F_ASN1_INTEGER_SET, ERR_R_MALLOC_FAILURE);
357 return (0);
358 }
359 d = v;
360 if (d < 0) {
361 d = -d;
362 a->type = V_ASN1_NEG_INTEGER;
363 }
364
365 for (i = 0; i < sizeof(long); i++) {
366 if (d == 0)
367 break;
368 buf[i] = (int)d & 0xff;
369 d >>= 8;
370 }
371 j = 0;
372 for (k = i - 1; k >= 0; k--)
373 a->data[j++] = buf[k];
374 a->length = j;
375 return (1);
376}
377
378long
379ASN1_INTEGER_get(const ASN1_INTEGER *a)
380{
381 int neg = 0, i;
382 long r = 0;
383
384 if (a == NULL)
385 return (0L);
386 i = a->type;
387 if (i == V_ASN1_NEG_INTEGER)
388 neg = 1;
389 else if (i != V_ASN1_INTEGER)
390 return -1;
391
392 if (a->length > (int)sizeof(long)) {
393 /* hmm... a bit ugly, return all ones */
394 return -1;
395 }
396 if (a->data == NULL)
397 return 0;
398
399 for (i = 0; i < a->length; i++) {
400 r <<= 8;
401 r |= (unsigned char)a->data[i];
402 }
403 if (neg)
404 r = -r;
405 return (r);
406}
407
408ASN1_INTEGER *
409BN_to_ASN1_INTEGER(const BIGNUM *bn, ASN1_INTEGER *ai)
410{
411 ASN1_INTEGER *ret;
412 int len, j;
413
414 if (ai == NULL)
415 ret = ASN1_INTEGER_new();
416 else
417 ret = ai;
418 if (ret == NULL) {
419 ASN1err(ASN1_F_BN_TO_ASN1_INTEGER, ERR_R_NESTED_ASN1_ERROR);
420 goto err;
421 }
422 if (BN_is_negative(bn))
423 ret->type = V_ASN1_NEG_INTEGER;
424 else
425 ret->type = V_ASN1_INTEGER;
426 j = BN_num_bits(bn);
427 len = ((j == 0) ? 0 : ((j / 8) + 1));
428 if (ret->length < len + 4) {
429 unsigned char *new_data = realloc(ret->data, len + 4);
430 if (!new_data) {
431 ASN1err(ASN1_F_BN_TO_ASN1_INTEGER, ERR_R_MALLOC_FAILURE);
432 goto err;
433 }
434 ret->data = new_data;
435 }
436 ret->length = BN_bn2bin(bn, ret->data);
437
438 /* Correct zero case */
439 if (!ret->length) {
440 ret->data[0] = 0;
441 ret->length = 1;
442 }
443 return (ret);
444
445err:
446 if (ret != ai)
447 ASN1_INTEGER_free(ret);
448 return (NULL);
449}
450
451BIGNUM *
452ASN1_INTEGER_to_BN(const ASN1_INTEGER *ai, BIGNUM *bn)
453{
454 BIGNUM *ret;
455
456 if ((ret = BN_bin2bn(ai->data, ai->length, bn)) == NULL)
457 ASN1err(ASN1_F_ASN1_INTEGER_TO_BN, ASN1_R_BN_LIB);
458 else if (ai->type == V_ASN1_NEG_INTEGER)
459 BN_set_negative(ret, 1);
460 return (ret);
461}
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