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58964a49 RE |
1 | /* crypto/rsa/rsa_eay.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. | |
0f113f3e | 8 | * |
58964a49 RE |
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). | |
0f113f3e | 15 | * |
58964a49 RE |
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. | |
0f113f3e | 22 | * |
58964a49 RE |
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 :-). | |
0f113f3e | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
58964a49 RE |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 40 | * |
58964a49 RE |
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. | |
0f113f3e | 52 | * |
58964a49 RE |
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 | */ | |
46a64376 | 58 | /* ==================================================================== |
675f605d | 59 | * Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved. |
46a64376 BM |
60 | * |
61 | * Redistribution and use in source and binary forms, with or without | |
62 | * modification, are permitted provided that the following conditions | |
63 | * are met: | |
64 | * | |
65 | * 1. Redistributions of source code must retain the above copyright | |
0f113f3e | 66 | * notice, this list of conditions and the following disclaimer. |
46a64376 BM |
67 | * |
68 | * 2. Redistributions in binary form must reproduce the above copyright | |
69 | * notice, this list of conditions and the following disclaimer in | |
70 | * the documentation and/or other materials provided with the | |
71 | * distribution. | |
72 | * | |
73 | * 3. All advertising materials mentioning features or use of this | |
74 | * software must display the following acknowledgment: | |
75 | * "This product includes software developed by the OpenSSL Project | |
76 | * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" | |
77 | * | |
78 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
79 | * endorse or promote products derived from this software without | |
80 | * prior written permission. For written permission, please contact | |
81 | * openssl-core@openssl.org. | |
82 | * | |
83 | * 5. Products derived from this software may not be called "OpenSSL" | |
84 | * nor may "OpenSSL" appear in their names without prior written | |
85 | * permission of the OpenSSL Project. | |
86 | * | |
87 | * 6. Redistributions of any form whatsoever must retain the following | |
88 | * acknowledgment: | |
89 | * "This product includes software developed by the OpenSSL Project | |
90 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)" | |
91 | * | |
92 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
93 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
94 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
95 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
96 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
97 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
98 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
99 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
100 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
101 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
102 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
103 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
104 | * ==================================================================== | |
105 | * | |
106 | * This product includes cryptographic software written by Eric Young | |
107 | * (eay@cryptsoft.com). This product includes software written by Tim | |
108 | * Hudson (tjh@cryptsoft.com). | |
109 | * | |
110 | */ | |
58964a49 | 111 | |
b39fc560 | 112 | #include "internal/cryptlib.h" |
18125f7f | 113 | #include "internal/bn_int.h" |
ec577822 BM |
114 | #include <openssl/rsa.h> |
115 | #include <openssl/rand.h> | |
58964a49 | 116 | |
c1cd88a0 DSH |
117 | #ifndef RSA_NULL |
118 | ||
29c1f061 | 119 | static int RSA_eay_public_encrypt(int flen, const unsigned char *from, |
0f113f3e | 120 | unsigned char *to, RSA *rsa, int padding); |
29c1f061 | 121 | static int RSA_eay_private_encrypt(int flen, const unsigned char *from, |
0f113f3e | 122 | unsigned char *to, RSA *rsa, int padding); |
29c1f061 | 123 | static int RSA_eay_public_decrypt(int flen, const unsigned char *from, |
0f113f3e | 124 | unsigned char *to, RSA *rsa, int padding); |
29c1f061 | 125 | static int RSA_eay_private_decrypt(int flen, const unsigned char *from, |
0f113f3e MC |
126 | unsigned char *to, RSA *rsa, int padding); |
127 | static int RSA_eay_mod_exp(BIGNUM *r0, const BIGNUM *i, RSA *rsa, | |
128 | BN_CTX *ctx); | |
58964a49 RE |
129 | static int RSA_eay_init(RSA *rsa); |
130 | static int RSA_eay_finish(RSA *rsa); | |
0f113f3e MC |
131 | static RSA_METHOD rsa_pkcs1_eay_meth = { |
132 | "Eric Young's PKCS#1 RSA", | |
133 | RSA_eay_public_encrypt, | |
134 | RSA_eay_public_decrypt, /* signature verification */ | |
135 | RSA_eay_private_encrypt, /* signing */ | |
136 | RSA_eay_private_decrypt, | |
137 | RSA_eay_mod_exp, | |
138 | BN_mod_exp_mont, /* XXX probably we should not use Montgomery | |
139 | * if e == 3 */ | |
140 | RSA_eay_init, | |
141 | RSA_eay_finish, | |
142 | RSA_FLAG_FIPS_METHOD, /* flags */ | |
143 | NULL, | |
144 | 0, /* rsa_sign */ | |
145 | 0, /* rsa_verify */ | |
146 | NULL /* rsa_keygen */ | |
147 | }; | |
58964a49 | 148 | |
7be7c2ed | 149 | const RSA_METHOD *RSA_PKCS1_SSLeay(void) |
0f113f3e MC |
150 | { |
151 | return (&rsa_pkcs1_eay_meth); | |
152 | } | |
58964a49 | 153 | |
29c1f061 | 154 | static int RSA_eay_public_encrypt(int flen, const unsigned char *from, |
0f113f3e MC |
155 | unsigned char *to, RSA *rsa, int padding) |
156 | { | |
157 | BIGNUM *f, *ret; | |
158 | int i, j, k, num = 0, r = -1; | |
159 | unsigned char *buf = NULL; | |
160 | BN_CTX *ctx = NULL; | |
161 | ||
162 | if (BN_num_bits(rsa->n) > OPENSSL_RSA_MAX_MODULUS_BITS) { | |
163 | RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT, RSA_R_MODULUS_TOO_LARGE); | |
164 | return -1; | |
165 | } | |
166 | ||
167 | if (BN_ucmp(rsa->n, rsa->e) <= 0) { | |
168 | RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT, RSA_R_BAD_E_VALUE); | |
169 | return -1; | |
170 | } | |
171 | ||
172 | /* for large moduli, enforce exponent limit */ | |
173 | if (BN_num_bits(rsa->n) > OPENSSL_RSA_SMALL_MODULUS_BITS) { | |
174 | if (BN_num_bits(rsa->e) > OPENSSL_RSA_MAX_PUBEXP_BITS) { | |
175 | RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT, RSA_R_BAD_E_VALUE); | |
176 | return -1; | |
177 | } | |
178 | } | |
179 | ||
180 | if ((ctx = BN_CTX_new()) == NULL) | |
181 | goto err; | |
182 | BN_CTX_start(ctx); | |
183 | f = BN_CTX_get(ctx); | |
184 | ret = BN_CTX_get(ctx); | |
185 | num = BN_num_bytes(rsa->n); | |
186 | buf = OPENSSL_malloc(num); | |
187 | if (!f || !ret || !buf) { | |
188 | RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT, ERR_R_MALLOC_FAILURE); | |
189 | goto err; | |
190 | } | |
191 | ||
192 | switch (padding) { | |
193 | case RSA_PKCS1_PADDING: | |
194 | i = RSA_padding_add_PKCS1_type_2(buf, num, from, flen); | |
195 | break; | |
0f113f3e MC |
196 | case RSA_PKCS1_OAEP_PADDING: |
197 | i = RSA_padding_add_PKCS1_OAEP(buf, num, from, flen, NULL, 0); | |
198 | break; | |
0f113f3e MC |
199 | case RSA_SSLV23_PADDING: |
200 | i = RSA_padding_add_SSLv23(buf, num, from, flen); | |
201 | break; | |
202 | case RSA_NO_PADDING: | |
203 | i = RSA_padding_add_none(buf, num, from, flen); | |
204 | break; | |
205 | default: | |
206 | RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT, RSA_R_UNKNOWN_PADDING_TYPE); | |
207 | goto err; | |
208 | } | |
209 | if (i <= 0) | |
210 | goto err; | |
211 | ||
212 | if (BN_bin2bn(buf, num, f) == NULL) | |
213 | goto err; | |
214 | ||
215 | if (BN_ucmp(f, rsa->n) >= 0) { | |
216 | /* usually the padding functions would catch this */ | |
217 | RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT, | |
218 | RSA_R_DATA_TOO_LARGE_FOR_MODULUS); | |
219 | goto err; | |
220 | } | |
221 | ||
222 | if (rsa->flags & RSA_FLAG_CACHE_PUBLIC) | |
223 | if (!BN_MONT_CTX_set_locked | |
224 | (&rsa->_method_mod_n, CRYPTO_LOCK_RSA, rsa->n, ctx)) | |
225 | goto err; | |
226 | ||
227 | if (!rsa->meth->bn_mod_exp(ret, f, rsa->e, rsa->n, ctx, | |
228 | rsa->_method_mod_n)) | |
229 | goto err; | |
230 | ||
231 | /* | |
232 | * put in leading 0 bytes if the number is less than the length of the | |
233 | * modulus | |
234 | */ | |
235 | j = BN_num_bytes(ret); | |
236 | i = BN_bn2bin(ret, &(to[num - j])); | |
237 | for (k = 0; k < (num - i); k++) | |
238 | to[k] = 0; | |
239 | ||
240 | r = num; | |
241 | err: | |
23a1d5e9 | 242 | if (ctx != NULL) |
0f113f3e | 243 | BN_CTX_end(ctx); |
23a1d5e9 | 244 | BN_CTX_free(ctx); |
4b45c6e5 | 245 | OPENSSL_clear_free(buf, num); |
0f113f3e MC |
246 | return (r); |
247 | } | |
58964a49 | 248 | |
675f605d | 249 | static BN_BLINDING *rsa_get_blinding(RSA *rsa, int *local, BN_CTX *ctx) |
800e400d | 250 | { |
0f113f3e MC |
251 | BN_BLINDING *ret; |
252 | int got_write_lock = 0; | |
253 | CRYPTO_THREADID cur; | |
254 | ||
255 | CRYPTO_r_lock(CRYPTO_LOCK_RSA); | |
256 | ||
257 | if (rsa->blinding == NULL) { | |
258 | CRYPTO_r_unlock(CRYPTO_LOCK_RSA); | |
259 | CRYPTO_w_lock(CRYPTO_LOCK_RSA); | |
260 | got_write_lock = 1; | |
261 | ||
262 | if (rsa->blinding == NULL) | |
263 | rsa->blinding = RSA_setup_blinding(rsa, ctx); | |
264 | } | |
265 | ||
266 | ret = rsa->blinding; | |
267 | if (ret == NULL) | |
268 | goto err; | |
269 | ||
270 | CRYPTO_THREADID_current(&cur); | |
271 | if (!CRYPTO_THREADID_cmp(&cur, BN_BLINDING_thread_id(ret))) { | |
272 | /* rsa->blinding is ours! */ | |
273 | ||
274 | *local = 1; | |
275 | } else { | |
276 | /* resort to rsa->mt_blinding instead */ | |
277 | ||
278 | /* | |
279 | * instructs rsa_blinding_convert(), rsa_blinding_invert() that the | |
280 | * BN_BLINDING is shared, meaning that accesses require locks, and | |
281 | * that the blinding factor must be stored outside the BN_BLINDING | |
282 | */ | |
283 | *local = 0; | |
284 | ||
285 | if (rsa->mt_blinding == NULL) { | |
286 | if (!got_write_lock) { | |
287 | CRYPTO_r_unlock(CRYPTO_LOCK_RSA); | |
288 | CRYPTO_w_lock(CRYPTO_LOCK_RSA); | |
289 | got_write_lock = 1; | |
290 | } | |
291 | ||
292 | if (rsa->mt_blinding == NULL) | |
293 | rsa->mt_blinding = RSA_setup_blinding(rsa, ctx); | |
294 | } | |
295 | ret = rsa->mt_blinding; | |
296 | } | |
5679bcce | 297 | |
675f605d | 298 | err: |
0f113f3e MC |
299 | if (got_write_lock) |
300 | CRYPTO_w_unlock(CRYPTO_LOCK_RSA); | |
301 | else | |
302 | CRYPTO_r_unlock(CRYPTO_LOCK_RSA); | |
303 | return ret; | |
800e400d | 304 | } |
5679bcce | 305 | |
e5641d7f | 306 | static int rsa_blinding_convert(BN_BLINDING *b, BIGNUM *f, BIGNUM *unblind, |
0f113f3e MC |
307 | BN_CTX *ctx) |
308 | { | |
309 | if (unblind == NULL) | |
310 | /* | |
311 | * Local blinding: store the unblinding factor in BN_BLINDING. | |
312 | */ | |
313 | return BN_BLINDING_convert_ex(f, NULL, b, ctx); | |
314 | else { | |
315 | /* | |
316 | * Shared blinding: store the unblinding factor outside BN_BLINDING. | |
317 | */ | |
318 | int ret; | |
319 | CRYPTO_w_lock(CRYPTO_LOCK_RSA_BLINDING); | |
320 | ret = BN_BLINDING_convert_ex(f, unblind, b, ctx); | |
321 | CRYPTO_w_unlock(CRYPTO_LOCK_RSA_BLINDING); | |
322 | return ret; | |
323 | } | |
324 | } | |
e5641d7f BM |
325 | |
326 | static int rsa_blinding_invert(BN_BLINDING *b, BIGNUM *f, BIGNUM *unblind, | |
0f113f3e MC |
327 | BN_CTX *ctx) |
328 | { | |
329 | /* | |
330 | * For local blinding, unblind is set to NULL, and BN_BLINDING_invert_ex | |
331 | * will use the unblinding factor stored in BN_BLINDING. If BN_BLINDING | |
332 | * is shared between threads, unblind must be non-null: | |
333 | * BN_BLINDING_invert_ex will then use the local unblinding factor, and | |
334 | * will only read the modulus from BN_BLINDING. In both cases it's safe | |
335 | * to access the blinding without a lock. | |
336 | */ | |
337 | return BN_BLINDING_invert_ex(f, unblind, b, ctx); | |
338 | } | |
5679bcce | 339 | |
24cff6ce | 340 | /* signing */ |
29c1f061 | 341 | static int RSA_eay_private_encrypt(int flen, const unsigned char *from, |
0f113f3e MC |
342 | unsigned char *to, RSA *rsa, int padding) |
343 | { | |
344 | BIGNUM *f, *ret, *res; | |
345 | int i, j, k, num = 0, r = -1; | |
346 | unsigned char *buf = NULL; | |
347 | BN_CTX *ctx = NULL; | |
348 | int local_blinding = 0; | |
349 | /* | |
350 | * Used only if the blinding structure is shared. A non-NULL unblind | |
351 | * instructs rsa_blinding_convert() and rsa_blinding_invert() to store | |
352 | * the unblinding factor outside the blinding structure. | |
353 | */ | |
354 | BIGNUM *unblind = NULL; | |
355 | BN_BLINDING *blinding = NULL; | |
356 | ||
357 | if ((ctx = BN_CTX_new()) == NULL) | |
358 | goto err; | |
359 | BN_CTX_start(ctx); | |
360 | f = BN_CTX_get(ctx); | |
361 | ret = BN_CTX_get(ctx); | |
362 | num = BN_num_bytes(rsa->n); | |
363 | buf = OPENSSL_malloc(num); | |
364 | if (!f || !ret || !buf) { | |
365 | RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, ERR_R_MALLOC_FAILURE); | |
366 | goto err; | |
367 | } | |
368 | ||
369 | switch (padding) { | |
370 | case RSA_PKCS1_PADDING: | |
371 | i = RSA_padding_add_PKCS1_type_1(buf, num, from, flen); | |
372 | break; | |
373 | case RSA_X931_PADDING: | |
374 | i = RSA_padding_add_X931(buf, num, from, flen); | |
375 | break; | |
376 | case RSA_NO_PADDING: | |
377 | i = RSA_padding_add_none(buf, num, from, flen); | |
378 | break; | |
379 | case RSA_SSLV23_PADDING: | |
380 | default: | |
381 | RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, RSA_R_UNKNOWN_PADDING_TYPE); | |
382 | goto err; | |
383 | } | |
384 | if (i <= 0) | |
385 | goto err; | |
386 | ||
387 | if (BN_bin2bn(buf, num, f) == NULL) | |
388 | goto err; | |
389 | ||
390 | if (BN_ucmp(f, rsa->n) >= 0) { | |
391 | /* usually the padding functions would catch this */ | |
392 | RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, | |
393 | RSA_R_DATA_TOO_LARGE_FOR_MODULUS); | |
394 | goto err; | |
395 | } | |
396 | ||
397 | if (!(rsa->flags & RSA_FLAG_NO_BLINDING)) { | |
398 | blinding = rsa_get_blinding(rsa, &local_blinding, ctx); | |
399 | if (blinding == NULL) { | |
400 | RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, ERR_R_INTERNAL_ERROR); | |
401 | goto err; | |
402 | } | |
403 | } | |
404 | ||
405 | if (blinding != NULL) { | |
406 | if (!local_blinding && ((unblind = BN_CTX_get(ctx)) == NULL)) { | |
407 | RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, ERR_R_MALLOC_FAILURE); | |
408 | goto err; | |
409 | } | |
410 | if (!rsa_blinding_convert(blinding, f, unblind, ctx)) | |
411 | goto err; | |
412 | } | |
413 | ||
414 | if ((rsa->flags & RSA_FLAG_EXT_PKEY) || | |
415 | ((rsa->p != NULL) && | |
416 | (rsa->q != NULL) && | |
417 | (rsa->dmp1 != NULL) && (rsa->dmq1 != NULL) && (rsa->iqmp != NULL))) { | |
418 | if (!rsa->meth->rsa_mod_exp(ret, f, rsa, ctx)) | |
419 | goto err; | |
420 | } else { | |
421 | BIGNUM *d = NULL, *local_d = NULL; | |
422 | ||
423 | if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) { | |
424 | local_d = d = BN_new(); | |
425 | if (!d) { | |
426 | RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, ERR_R_MALLOC_FAILURE); | |
427 | goto err; | |
428 | } | |
429 | BN_with_flags(d, rsa->d, BN_FLG_CONSTTIME); | |
430 | } else | |
431 | d = rsa->d; | |
432 | ||
433 | if (rsa->flags & RSA_FLAG_CACHE_PUBLIC) | |
434 | if (!BN_MONT_CTX_set_locked | |
435 | (&rsa->_method_mod_n, CRYPTO_LOCK_RSA, rsa->n, ctx)) { | |
23a1d5e9 | 436 | BN_free(local_d); |
0f113f3e MC |
437 | goto err; |
438 | } | |
439 | ||
440 | if (!rsa->meth->bn_mod_exp(ret, f, d, rsa->n, ctx, | |
441 | rsa->_method_mod_n)) { | |
23a1d5e9 | 442 | BN_free(local_d); |
0f113f3e MC |
443 | goto err; |
444 | } | |
23a1d5e9 | 445 | BN_free(local_d); |
0f113f3e MC |
446 | } |
447 | ||
448 | if (blinding) | |
449 | if (!rsa_blinding_invert(blinding, ret, unblind, ctx)) | |
450 | goto err; | |
451 | ||
452 | if (padding == RSA_X931_PADDING) { | |
453 | BN_sub(f, rsa->n, ret); | |
454 | if (BN_cmp(ret, f) > 0) | |
455 | res = f; | |
456 | else | |
457 | res = ret; | |
458 | } else | |
459 | res = ret; | |
460 | ||
461 | /* | |
462 | * put in leading 0 bytes if the number is less than the length of the | |
463 | * modulus | |
464 | */ | |
465 | j = BN_num_bytes(res); | |
466 | i = BN_bn2bin(res, &(to[num - j])); | |
467 | for (k = 0; k < (num - i); k++) | |
468 | to[k] = 0; | |
469 | ||
470 | r = num; | |
471 | err: | |
23a1d5e9 | 472 | if (ctx != NULL) |
0f113f3e | 473 | BN_CTX_end(ctx); |
23a1d5e9 | 474 | BN_CTX_free(ctx); |
4b45c6e5 | 475 | OPENSSL_clear_free(buf, num); |
0f113f3e MC |
476 | return (r); |
477 | } | |
58964a49 | 478 | |
29c1f061 | 479 | static int RSA_eay_private_decrypt(int flen, const unsigned char *from, |
0f113f3e MC |
480 | unsigned char *to, RSA *rsa, int padding) |
481 | { | |
482 | BIGNUM *f, *ret; | |
483 | int j, num = 0, r = -1; | |
484 | unsigned char *p; | |
485 | unsigned char *buf = NULL; | |
486 | BN_CTX *ctx = NULL; | |
487 | int local_blinding = 0; | |
488 | /* | |
489 | * Used only if the blinding structure is shared. A non-NULL unblind | |
490 | * instructs rsa_blinding_convert() and rsa_blinding_invert() to store | |
491 | * the unblinding factor outside the blinding structure. | |
492 | */ | |
493 | BIGNUM *unblind = NULL; | |
494 | BN_BLINDING *blinding = NULL; | |
495 | ||
496 | if ((ctx = BN_CTX_new()) == NULL) | |
497 | goto err; | |
498 | BN_CTX_start(ctx); | |
499 | f = BN_CTX_get(ctx); | |
500 | ret = BN_CTX_get(ctx); | |
501 | num = BN_num_bytes(rsa->n); | |
502 | buf = OPENSSL_malloc(num); | |
503 | if (!f || !ret || !buf) { | |
504 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT, ERR_R_MALLOC_FAILURE); | |
505 | goto err; | |
506 | } | |
507 | ||
508 | /* | |
509 | * This check was for equality but PGP does evil things and chops off the | |
510 | * top '0' bytes | |
511 | */ | |
512 | if (flen > num) { | |
513 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT, | |
514 | RSA_R_DATA_GREATER_THAN_MOD_LEN); | |
515 | goto err; | |
516 | } | |
517 | ||
518 | /* make data into a big number */ | |
519 | if (BN_bin2bn(from, (int)flen, f) == NULL) | |
520 | goto err; | |
521 | ||
522 | if (BN_ucmp(f, rsa->n) >= 0) { | |
523 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT, | |
524 | RSA_R_DATA_TOO_LARGE_FOR_MODULUS); | |
525 | goto err; | |
526 | } | |
527 | ||
528 | if (!(rsa->flags & RSA_FLAG_NO_BLINDING)) { | |
529 | blinding = rsa_get_blinding(rsa, &local_blinding, ctx); | |
530 | if (blinding == NULL) { | |
531 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT, ERR_R_INTERNAL_ERROR); | |
532 | goto err; | |
533 | } | |
534 | } | |
535 | ||
536 | if (blinding != NULL) { | |
537 | if (!local_blinding && ((unblind = BN_CTX_get(ctx)) == NULL)) { | |
538 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT, ERR_R_MALLOC_FAILURE); | |
539 | goto err; | |
540 | } | |
541 | if (!rsa_blinding_convert(blinding, f, unblind, ctx)) | |
542 | goto err; | |
543 | } | |
544 | ||
545 | /* do the decrypt */ | |
546 | if ((rsa->flags & RSA_FLAG_EXT_PKEY) || | |
547 | ((rsa->p != NULL) && | |
548 | (rsa->q != NULL) && | |
549 | (rsa->dmp1 != NULL) && (rsa->dmq1 != NULL) && (rsa->iqmp != NULL))) { | |
550 | if (!rsa->meth->rsa_mod_exp(ret, f, rsa, ctx)) | |
551 | goto err; | |
552 | } else { | |
553 | BIGNUM *d = NULL, *local_d = NULL; | |
554 | ||
555 | if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) { | |
556 | local_d = d = BN_new(); | |
557 | if (!d) { | |
558 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT, ERR_R_MALLOC_FAILURE); | |
559 | goto err; | |
560 | } | |
561 | BN_with_flags(d, rsa->d, BN_FLG_CONSTTIME); | |
562 | } else | |
563 | d = rsa->d; | |
564 | ||
565 | if (rsa->flags & RSA_FLAG_CACHE_PUBLIC) | |
566 | if (!BN_MONT_CTX_set_locked | |
567 | (&rsa->_method_mod_n, CRYPTO_LOCK_RSA, rsa->n, ctx)) { | |
23a1d5e9 | 568 | BN_free(local_d); |
0f113f3e MC |
569 | goto err; |
570 | } | |
571 | if (!rsa->meth->bn_mod_exp(ret, f, d, rsa->n, ctx, | |
572 | rsa->_method_mod_n)) { | |
23a1d5e9 | 573 | BN_free(local_d); |
0f113f3e MC |
574 | goto err; |
575 | } | |
23a1d5e9 | 576 | BN_free(local_d); |
0f113f3e MC |
577 | } |
578 | ||
579 | if (blinding) | |
580 | if (!rsa_blinding_invert(blinding, ret, unblind, ctx)) | |
581 | goto err; | |
582 | ||
583 | p = buf; | |
584 | j = BN_bn2bin(ret, p); /* j is only used with no-padding mode */ | |
585 | ||
586 | switch (padding) { | |
587 | case RSA_PKCS1_PADDING: | |
588 | r = RSA_padding_check_PKCS1_type_2(to, num, buf, j, num); | |
589 | break; | |
0f113f3e MC |
590 | case RSA_PKCS1_OAEP_PADDING: |
591 | r = RSA_padding_check_PKCS1_OAEP(to, num, buf, j, num, NULL, 0); | |
592 | break; | |
0f113f3e MC |
593 | case RSA_SSLV23_PADDING: |
594 | r = RSA_padding_check_SSLv23(to, num, buf, j, num); | |
595 | break; | |
596 | case RSA_NO_PADDING: | |
597 | r = RSA_padding_check_none(to, num, buf, j, num); | |
598 | break; | |
599 | default: | |
600 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT, RSA_R_UNKNOWN_PADDING_TYPE); | |
601 | goto err; | |
602 | } | |
603 | if (r < 0) | |
604 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT, RSA_R_PADDING_CHECK_FAILED); | |
605 | ||
606 | err: | |
23a1d5e9 | 607 | if (ctx != NULL) |
0f113f3e | 608 | BN_CTX_end(ctx); |
23a1d5e9 | 609 | BN_CTX_free(ctx); |
4b45c6e5 | 610 | OPENSSL_clear_free(buf, num); |
0f113f3e MC |
611 | return (r); |
612 | } | |
58964a49 | 613 | |
24cff6ce | 614 | /* signature verification */ |
29c1f061 | 615 | static int RSA_eay_public_decrypt(int flen, const unsigned char *from, |
0f113f3e MC |
616 | unsigned char *to, RSA *rsa, int padding) |
617 | { | |
618 | BIGNUM *f, *ret; | |
619 | int i, num = 0, r = -1; | |
620 | unsigned char *p; | |
621 | unsigned char *buf = NULL; | |
622 | BN_CTX *ctx = NULL; | |
623 | ||
624 | if (BN_num_bits(rsa->n) > OPENSSL_RSA_MAX_MODULUS_BITS) { | |
625 | RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, RSA_R_MODULUS_TOO_LARGE); | |
626 | return -1; | |
627 | } | |
628 | ||
629 | if (BN_ucmp(rsa->n, rsa->e) <= 0) { | |
630 | RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, RSA_R_BAD_E_VALUE); | |
631 | return -1; | |
632 | } | |
633 | ||
634 | /* for large moduli, enforce exponent limit */ | |
635 | if (BN_num_bits(rsa->n) > OPENSSL_RSA_SMALL_MODULUS_BITS) { | |
636 | if (BN_num_bits(rsa->e) > OPENSSL_RSA_MAX_PUBEXP_BITS) { | |
637 | RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, RSA_R_BAD_E_VALUE); | |
638 | return -1; | |
639 | } | |
640 | } | |
641 | ||
642 | if ((ctx = BN_CTX_new()) == NULL) | |
643 | goto err; | |
644 | BN_CTX_start(ctx); | |
645 | f = BN_CTX_get(ctx); | |
646 | ret = BN_CTX_get(ctx); | |
647 | num = BN_num_bytes(rsa->n); | |
648 | buf = OPENSSL_malloc(num); | |
649 | if (!f || !ret || !buf) { | |
650 | RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, ERR_R_MALLOC_FAILURE); | |
651 | goto err; | |
652 | } | |
653 | ||
654 | /* | |
655 | * This check was for equality but PGP does evil things and chops off the | |
656 | * top '0' bytes | |
657 | */ | |
658 | if (flen > num) { | |
659 | RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, RSA_R_DATA_GREATER_THAN_MOD_LEN); | |
660 | goto err; | |
661 | } | |
662 | ||
663 | if (BN_bin2bn(from, flen, f) == NULL) | |
664 | goto err; | |
665 | ||
666 | if (BN_ucmp(f, rsa->n) >= 0) { | |
667 | RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, | |
668 | RSA_R_DATA_TOO_LARGE_FOR_MODULUS); | |
669 | goto err; | |
670 | } | |
671 | ||
672 | if (rsa->flags & RSA_FLAG_CACHE_PUBLIC) | |
673 | if (!BN_MONT_CTX_set_locked | |
674 | (&rsa->_method_mod_n, CRYPTO_LOCK_RSA, rsa->n, ctx)) | |
675 | goto err; | |
676 | ||
677 | if (!rsa->meth->bn_mod_exp(ret, f, rsa->e, rsa->n, ctx, | |
678 | rsa->_method_mod_n)) | |
679 | goto err; | |
680 | ||
681 | if ((padding == RSA_X931_PADDING) && ((bn_get_words(ret)[0] & 0xf) != 12)) | |
682 | if (!BN_sub(ret, rsa->n, ret)) | |
683 | goto err; | |
684 | ||
685 | p = buf; | |
686 | i = BN_bn2bin(ret, p); | |
687 | ||
688 | switch (padding) { | |
689 | case RSA_PKCS1_PADDING: | |
690 | r = RSA_padding_check_PKCS1_type_1(to, num, buf, i, num); | |
691 | break; | |
692 | case RSA_X931_PADDING: | |
693 | r = RSA_padding_check_X931(to, num, buf, i, num); | |
694 | break; | |
695 | case RSA_NO_PADDING: | |
696 | r = RSA_padding_check_none(to, num, buf, i, num); | |
697 | break; | |
698 | default: | |
699 | RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, RSA_R_UNKNOWN_PADDING_TYPE); | |
700 | goto err; | |
701 | } | |
702 | if (r < 0) | |
703 | RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, RSA_R_PADDING_CHECK_FAILED); | |
704 | ||
705 | err: | |
23a1d5e9 | 706 | if (ctx != NULL) |
0f113f3e | 707 | BN_CTX_end(ctx); |
23a1d5e9 | 708 | BN_CTX_free(ctx); |
4b45c6e5 | 709 | OPENSSL_clear_free(buf, num); |
0f113f3e MC |
710 | return (r); |
711 | } | |
58964a49 | 712 | |
46ef873f | 713 | static int RSA_eay_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx) |
0f113f3e MC |
714 | { |
715 | BIGNUM *r1, *m1, *vrfy; | |
716 | BIGNUM *local_dmp1, *local_dmq1, *local_c, *local_r1; | |
717 | BIGNUM *dmp1, *dmq1, *c, *pr1; | |
718 | int ret = 0; | |
719 | ||
720 | local_dmp1 = BN_new(); | |
721 | local_dmq1 = BN_new(); | |
722 | local_c = BN_new(); | |
723 | local_r1 = BN_new(); | |
724 | if (!local_dmp1 || !local_dmq1 || !local_c || !local_r1) | |
725 | goto err; | |
726 | ||
727 | BN_CTX_start(ctx); | |
728 | r1 = BN_CTX_get(ctx); | |
729 | m1 = BN_CTX_get(ctx); | |
730 | vrfy = BN_CTX_get(ctx); | |
731 | ||
732 | { | |
733 | BIGNUM *local_p = NULL, *local_q = NULL; | |
734 | BIGNUM *p = NULL, *q = NULL; | |
735 | ||
736 | /* | |
737 | * Make sure BN_mod_inverse in Montgomery intialization uses the | |
738 | * BN_FLG_CONSTTIME flag (unless RSA_FLAG_NO_CONSTTIME is set) | |
739 | */ | |
740 | if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) { | |
741 | local_p = p = BN_new(); | |
742 | if (!p) | |
743 | goto err; | |
744 | BN_with_flags(p, rsa->p, BN_FLG_CONSTTIME); | |
745 | ||
746 | local_q = q = BN_new(); | |
747 | if (!q) { | |
748 | BN_free(local_p); | |
749 | goto err; | |
750 | } | |
751 | BN_with_flags(q, rsa->q, BN_FLG_CONSTTIME); | |
752 | } else { | |
753 | p = rsa->p; | |
754 | q = rsa->q; | |
755 | } | |
756 | ||
757 | if (rsa->flags & RSA_FLAG_CACHE_PRIVATE) { | |
758 | if (!BN_MONT_CTX_set_locked | |
759 | (&rsa->_method_mod_p, CRYPTO_LOCK_RSA, p, ctx) | |
760 | || !BN_MONT_CTX_set_locked(&rsa->_method_mod_q, | |
761 | CRYPTO_LOCK_RSA, q, ctx)) { | |
23a1d5e9 RS |
762 | BN_free(local_p); |
763 | BN_free(local_q); | |
0f113f3e MC |
764 | goto err; |
765 | } | |
766 | } | |
23a1d5e9 RS |
767 | BN_free(local_p); |
768 | BN_free(local_q); | |
0f113f3e MC |
769 | } |
770 | ||
771 | if (rsa->flags & RSA_FLAG_CACHE_PUBLIC) | |
772 | if (!BN_MONT_CTX_set_locked | |
773 | (&rsa->_method_mod_n, CRYPTO_LOCK_RSA, rsa->n, ctx)) | |
774 | goto err; | |
775 | ||
776 | /* compute I mod q */ | |
777 | if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) { | |
778 | c = local_c; | |
779 | BN_with_flags(c, I, BN_FLG_CONSTTIME); | |
780 | if (!BN_mod(r1, c, rsa->q, ctx)) | |
781 | goto err; | |
782 | } else { | |
783 | if (!BN_mod(r1, I, rsa->q, ctx)) | |
784 | goto err; | |
785 | } | |
786 | ||
787 | /* compute r1^dmq1 mod q */ | |
788 | if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) { | |
789 | dmq1 = local_dmq1; | |
790 | BN_with_flags(dmq1, rsa->dmq1, BN_FLG_CONSTTIME); | |
791 | } else | |
792 | dmq1 = rsa->dmq1; | |
793 | if (!rsa->meth->bn_mod_exp(m1, r1, dmq1, rsa->q, ctx, rsa->_method_mod_q)) | |
794 | goto err; | |
795 | ||
796 | /* compute I mod p */ | |
797 | if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) { | |
798 | c = local_c; | |
799 | BN_with_flags(c, I, BN_FLG_CONSTTIME); | |
800 | if (!BN_mod(r1, c, rsa->p, ctx)) | |
801 | goto err; | |
802 | } else { | |
803 | if (!BN_mod(r1, I, rsa->p, ctx)) | |
804 | goto err; | |
805 | } | |
806 | ||
807 | /* compute r1^dmp1 mod p */ | |
808 | if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) { | |
809 | dmp1 = local_dmp1; | |
810 | BN_with_flags(dmp1, rsa->dmp1, BN_FLG_CONSTTIME); | |
811 | } else | |
812 | dmp1 = rsa->dmp1; | |
813 | if (!rsa->meth->bn_mod_exp(r0, r1, dmp1, rsa->p, ctx, rsa->_method_mod_p)) | |
814 | goto err; | |
815 | ||
816 | if (!BN_sub(r0, r0, m1)) | |
817 | goto err; | |
818 | /* | |
819 | * This will help stop the size of r0 increasing, which does affect the | |
820 | * multiply if it optimised for a power of 2 size | |
821 | */ | |
822 | if (BN_is_negative(r0)) | |
823 | if (!BN_add(r0, r0, rsa->p)) | |
824 | goto err; | |
825 | ||
826 | if (!BN_mul(r1, r0, rsa->iqmp, ctx)) | |
827 | goto err; | |
828 | ||
829 | /* Turn BN_FLG_CONSTTIME flag on before division operation */ | |
830 | if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) { | |
831 | pr1 = local_r1; | |
832 | BN_with_flags(pr1, r1, BN_FLG_CONSTTIME); | |
833 | } else | |
834 | pr1 = r1; | |
835 | if (!BN_mod(r0, pr1, rsa->p, ctx)) | |
836 | goto err; | |
837 | ||
838 | /* | |
839 | * If p < q it is occasionally possible for the correction of adding 'p' | |
840 | * if r0 is negative above to leave the result still negative. This can | |
841 | * break the private key operations: the following second correction | |
842 | * should *always* correct this rare occurrence. This will *never* happen | |
843 | * with OpenSSL generated keys because they ensure p > q [steve] | |
844 | */ | |
845 | if (BN_is_negative(r0)) | |
846 | if (!BN_add(r0, r0, rsa->p)) | |
847 | goto err; | |
848 | if (!BN_mul(r1, r0, rsa->q, ctx)) | |
849 | goto err; | |
850 | if (!BN_add(r0, r1, m1)) | |
851 | goto err; | |
852 | ||
853 | if (rsa->e && rsa->n) { | |
739a5eee MC |
854 | if (!rsa->meth->bn_mod_exp(vrfy, r0, rsa->e, rsa->n, ctx, |
855 | rsa->_method_mod_n)) | |
0f113f3e MC |
856 | goto err; |
857 | /* | |
858 | * If 'I' was greater than (or equal to) rsa->n, the operation will | |
859 | * be equivalent to using 'I mod n'. However, the result of the | |
860 | * verify will *always* be less than 'n' so we don't check for | |
861 | * absolute equality, just congruency. | |
862 | */ | |
863 | if (!BN_sub(vrfy, vrfy, I)) | |
864 | goto err; | |
865 | if (!BN_mod(vrfy, vrfy, rsa->n, ctx)) | |
866 | goto err; | |
867 | if (BN_is_negative(vrfy)) | |
868 | if (!BN_add(vrfy, vrfy, rsa->n)) | |
869 | goto err; | |
870 | if (!BN_is_zero(vrfy)) { | |
871 | /* | |
872 | * 'I' and 'vrfy' aren't congruent mod n. Don't leak | |
873 | * miscalculated CRT output, just do a raw (slower) mod_exp and | |
874 | * return that instead. | |
875 | */ | |
876 | ||
877 | BIGNUM *local_d = NULL; | |
878 | BIGNUM *d = NULL; | |
879 | ||
880 | if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) { | |
881 | local_d = d = BN_new(); | |
882 | if (!d) | |
883 | goto err; | |
884 | BN_with_flags(d, rsa->d, BN_FLG_CONSTTIME); | |
885 | } else | |
886 | d = rsa->d; | |
887 | if (!rsa->meth->bn_mod_exp(r0, I, d, rsa->n, ctx, | |
888 | rsa->_method_mod_n)) { | |
23a1d5e9 | 889 | BN_free(local_d); |
0f113f3e MC |
890 | goto err; |
891 | } | |
892 | ||
23a1d5e9 | 893 | BN_free(local_d); |
0f113f3e MC |
894 | } |
895 | } | |
896 | ret = 1; | |
897 | err: | |
23a1d5e9 RS |
898 | BN_free(local_dmp1); |
899 | BN_free(local_dmq1); | |
900 | BN_free(local_c); | |
901 | BN_free(local_r1); | |
0f113f3e MC |
902 | BN_CTX_end(ctx); |
903 | return (ret); | |
904 | } | |
58964a49 | 905 | |
6b691a5c | 906 | static int RSA_eay_init(RSA *rsa) |
0f113f3e MC |
907 | { |
908 | rsa->flags |= RSA_FLAG_CACHE_PUBLIC | RSA_FLAG_CACHE_PRIVATE; | |
909 | return (1); | |
910 | } | |
58964a49 | 911 | |
6b691a5c | 912 | static int RSA_eay_finish(RSA *rsa) |
0f113f3e | 913 | { |
23a1d5e9 RS |
914 | BN_MONT_CTX_free(rsa->_method_mod_n); |
915 | BN_MONT_CTX_free(rsa->_method_mod_p); | |
916 | BN_MONT_CTX_free(rsa->_method_mod_q); | |
0f113f3e MC |
917 | return (1); |
918 | } | |
58964a49 | 919 | |
c1cd88a0 | 920 | #endif |