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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. | |
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 | */ | |
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 | |
66 | * notice, this list of conditions and the following disclaimer. | |
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 | |
73e45b2d | 112 | |
a27de7b7 | 113 | |
58964a49 | 114 | #include "cryptlib.h" |
18125f7f | 115 | #include "internal/bn_int.h" |
ec577822 BM |
116 | #include <openssl/rsa.h> |
117 | #include <openssl/rand.h> | |
58964a49 | 118 | |
c1cd88a0 DSH |
119 | #ifndef RSA_NULL |
120 | ||
29c1f061 | 121 | static int RSA_eay_public_encrypt(int flen, const unsigned char *from, |
58964a49 | 122 | unsigned char *to, RSA *rsa,int padding); |
29c1f061 | 123 | static int RSA_eay_private_encrypt(int flen, const unsigned char *from, |
58964a49 | 124 | unsigned char *to, RSA *rsa,int padding); |
29c1f061 | 125 | static int RSA_eay_public_decrypt(int flen, const unsigned char *from, |
58964a49 | 126 | unsigned char *to, RSA *rsa,int padding); |
29c1f061 | 127 | static int RSA_eay_private_decrypt(int flen, const unsigned char *from, |
58964a49 | 128 | unsigned char *to, RSA *rsa,int padding); |
46ef873f | 129 | static int RSA_eay_mod_exp(BIGNUM *r0, const BIGNUM *i, RSA *rsa, BN_CTX *ctx); |
58964a49 RE |
130 | static int RSA_eay_init(RSA *rsa); |
131 | static int RSA_eay_finish(RSA *rsa); | |
58964a49 RE |
132 | static RSA_METHOD rsa_pkcs1_eay_meth={ |
133 | "Eric Young's PKCS#1 RSA", | |
134 | RSA_eay_public_encrypt, | |
24cff6ce BM |
135 | RSA_eay_public_decrypt, /* signature verification */ |
136 | RSA_eay_private_encrypt, /* signing */ | |
58964a49 RE |
137 | RSA_eay_private_decrypt, |
138 | RSA_eay_mod_exp, | |
123d24d6 | 139 | BN_mod_exp_mont, /* XXX probably we should not use Montgomery if e == 3 */ |
58964a49 RE |
140 | RSA_eay_init, |
141 | RSA_eay_finish, | |
c553721e | 142 | RSA_FLAG_FIPS_METHOD, /* flags */ |
58964a49 | 143 | NULL, |
be6d7700 | 144 | 0, /* rsa_sign */ |
2814c629 GT |
145 | 0, /* rsa_verify */ |
146 | NULL /* rsa_keygen */ | |
58964a49 RE |
147 | }; |
148 | ||
7be7c2ed | 149 | const RSA_METHOD *RSA_PKCS1_SSLeay(void) |
58964a49 RE |
150 | { |
151 | return(&rsa_pkcs1_eay_meth); | |
152 | } | |
153 | ||
29c1f061 | 154 | static int RSA_eay_public_encrypt(int flen, const unsigned char *from, |
6b691a5c | 155 | unsigned char *to, RSA *rsa, int padding) |
58964a49 | 156 | { |
46ef873f | 157 | BIGNUM *f,*ret; |
58964a49 RE |
158 | int i,j,k,num=0,r= -1; |
159 | unsigned char *buf=NULL; | |
160 | BN_CTX *ctx=NULL; | |
161 | ||
5e3225cc BM |
162 | if (BN_num_bits(rsa->n) > OPENSSL_RSA_MAX_MODULUS_BITS) |
163 | { | |
164 | RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT, RSA_R_MODULUS_TOO_LARGE); | |
165 | return -1; | |
166 | } | |
167 | ||
168 | if (BN_ucmp(rsa->n, rsa->e) <= 0) | |
169 | { | |
170 | RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT, RSA_R_BAD_E_VALUE); | |
171 | return -1; | |
172 | } | |
173 | ||
174 | /* for large moduli, enforce exponent limit */ | |
175 | if (BN_num_bits(rsa->n) > OPENSSL_RSA_SMALL_MODULUS_BITS) | |
176 | { | |
177 | if (BN_num_bits(rsa->e) > OPENSSL_RSA_MAX_PUBEXP_BITS) | |
178 | { | |
179 | RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT, RSA_R_BAD_E_VALUE); | |
180 | return -1; | |
181 | } | |
182 | } | |
183 | ||
58964a49 | 184 | if ((ctx=BN_CTX_new()) == NULL) goto err; |
46ef873f GT |
185 | BN_CTX_start(ctx); |
186 | f = BN_CTX_get(ctx); | |
187 | ret = BN_CTX_get(ctx); | |
58964a49 | 188 | num=BN_num_bytes(rsa->n); |
46ef873f GT |
189 | buf = OPENSSL_malloc(num); |
190 | if (!f || !ret || !buf) | |
58964a49 RE |
191 | { |
192 | RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT,ERR_R_MALLOC_FAILURE); | |
193 | goto err; | |
194 | } | |
195 | ||
196 | switch (padding) | |
197 | { | |
198 | case RSA_PKCS1_PADDING: | |
199 | i=RSA_padding_add_PKCS1_type_2(buf,num,from,flen); | |
200 | break; | |
cf1b7d96 | 201 | #ifndef OPENSSL_NO_SHA |
a4949896 BL |
202 | case RSA_PKCS1_OAEP_PADDING: |
203 | i=RSA_padding_add_PKCS1_OAEP(buf,num,from,flen,NULL,0); | |
204 | break; | |
79df9d62 | 205 | #endif |
58964a49 RE |
206 | case RSA_SSLV23_PADDING: |
207 | i=RSA_padding_add_SSLv23(buf,num,from,flen); | |
208 | break; | |
209 | case RSA_NO_PADDING: | |
210 | i=RSA_padding_add_none(buf,num,from,flen); | |
211 | break; | |
212 | default: | |
213 | RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT,RSA_R_UNKNOWN_PADDING_TYPE); | |
214 | goto err; | |
215 | } | |
216 | if (i <= 0) goto err; | |
217 | ||
46ef873f | 218 | if (BN_bin2bn(buf,num,f) == NULL) goto err; |
58964a49 | 219 | |
46ef873f | 220 | if (BN_ucmp(f, rsa->n) >= 0) |
7c9882eb | 221 | { |
24cff6ce BM |
222 | /* usually the padding functions would catch this */ |
223 | RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT,RSA_R_DATA_TOO_LARGE_FOR_MODULUS); | |
224 | goto err; | |
225 | } | |
226 | ||
db99c525 BM |
227 | if (rsa->flags & RSA_FLAG_CACHE_PUBLIC) |
228 | if (!BN_MONT_CTX_set_locked(&rsa->_method_mod_n, CRYPTO_LOCK_RSA, rsa->n, ctx)) | |
229 | goto err; | |
79221bc2 | 230 | |
46ef873f | 231 | if (!rsa->meth->bn_mod_exp(ret,f,rsa->e,rsa->n,ctx, |
03f8b042 | 232 | rsa->_method_mod_n)) goto err; |
58964a49 RE |
233 | |
234 | /* put in leading 0 bytes if the number is less than the | |
235 | * length of the modulus */ | |
46ef873f GT |
236 | j=BN_num_bytes(ret); |
237 | i=BN_bn2bin(ret,&(to[num-j])); | |
58964a49 RE |
238 | for (k=0; k<(num-i); k++) |
239 | to[k]=0; | |
240 | ||
241 | r=num; | |
242 | err: | |
46ef873f GT |
243 | if (ctx != NULL) |
244 | { | |
245 | BN_CTX_end(ctx); | |
246 | BN_CTX_free(ctx); | |
247 | } | |
58964a49 RE |
248 | if (buf != NULL) |
249 | { | |
4579924b | 250 | OPENSSL_cleanse(buf,num); |
26a3a48d | 251 | OPENSSL_free(buf); |
58964a49 RE |
252 | } |
253 | return(r); | |
254 | } | |
255 | ||
675f605d | 256 | static BN_BLINDING *rsa_get_blinding(RSA *rsa, int *local, BN_CTX *ctx) |
800e400d NL |
257 | { |
258 | BN_BLINDING *ret; | |
675f605d | 259 | int got_write_lock = 0; |
4c329696 | 260 | CRYPTO_THREADID cur; |
675f605d BM |
261 | |
262 | CRYPTO_r_lock(CRYPTO_LOCK_RSA); | |
c554155b | 263 | |
800e400d NL |
264 | if (rsa->blinding == NULL) |
265 | { | |
675f605d BM |
266 | CRYPTO_r_unlock(CRYPTO_LOCK_RSA); |
267 | CRYPTO_w_lock(CRYPTO_LOCK_RSA); | |
268 | got_write_lock = 1; | |
269 | ||
800e400d | 270 | if (rsa->blinding == NULL) |
675f605d | 271 | rsa->blinding = RSA_setup_blinding(rsa, ctx); |
800e400d | 272 | } |
c554155b | 273 | |
800e400d NL |
274 | ret = rsa->blinding; |
275 | if (ret == NULL) | |
675f605d | 276 | goto err; |
5679bcce | 277 | |
4c329696 GT |
278 | CRYPTO_THREADID_current(&cur); |
279 | if (!CRYPTO_THREADID_cmp(&cur, BN_BLINDING_thread_id(ret))) | |
800e400d | 280 | { |
675f605d BM |
281 | /* rsa->blinding is ours! */ |
282 | ||
283 | *local = 1; | |
284 | } | |
285 | else | |
286 | { | |
287 | /* resort to rsa->mt_blinding instead */ | |
288 | ||
dbd87ffc MC |
289 | /* instructs rsa_blinding_convert(), rsa_blinding_invert() |
290 | * that the BN_BLINDING is shared, meaning that accesses | |
291 | * require locks, and that the blinding factor must be | |
292 | * stored outside the BN_BLINDING | |
293 | */ | |
294 | *local = 0; | |
675f605d | 295 | |
800e400d NL |
296 | if (rsa->mt_blinding == NULL) |
297 | { | |
675f605d BM |
298 | if (!got_write_lock) |
299 | { | |
300 | CRYPTO_r_unlock(CRYPTO_LOCK_RSA); | |
301 | CRYPTO_w_lock(CRYPTO_LOCK_RSA); | |
302 | got_write_lock = 1; | |
303 | } | |
304 | ||
800e400d NL |
305 | if (rsa->mt_blinding == NULL) |
306 | rsa->mt_blinding = RSA_setup_blinding(rsa, ctx); | |
800e400d NL |
307 | } |
308 | ret = rsa->mt_blinding; | |
309 | } | |
5679bcce | 310 | |
675f605d BM |
311 | err: |
312 | if (got_write_lock) | |
313 | CRYPTO_w_unlock(CRYPTO_LOCK_RSA); | |
314 | else | |
315 | CRYPTO_r_unlock(CRYPTO_LOCK_RSA); | |
800e400d NL |
316 | return ret; |
317 | } | |
5679bcce | 318 | |
e5641d7f BM |
319 | static int rsa_blinding_convert(BN_BLINDING *b, BIGNUM *f, BIGNUM *unblind, |
320 | BN_CTX *ctx) | |
321 | { | |
322 | if (unblind == NULL) | |
323 | /* Local blinding: store the unblinding factor | |
324 | * in BN_BLINDING. */ | |
800e400d NL |
325 | return BN_BLINDING_convert_ex(f, NULL, b, ctx); |
326 | else | |
5679bcce | 327 | { |
e5641d7f BM |
328 | /* Shared blinding: store the unblinding factor |
329 | * outside BN_BLINDING. */ | |
800e400d | 330 | int ret; |
ce75ca04 | 331 | CRYPTO_w_lock(CRYPTO_LOCK_RSA_BLINDING); |
e5641d7f | 332 | ret = BN_BLINDING_convert_ex(f, unblind, b, ctx); |
ce75ca04 | 333 | CRYPTO_w_unlock(CRYPTO_LOCK_RSA_BLINDING); |
800e400d | 334 | return ret; |
5679bcce | 335 | } |
e5641d7f BM |
336 | } |
337 | ||
338 | static int rsa_blinding_invert(BN_BLINDING *b, BIGNUM *f, BIGNUM *unblind, | |
339 | BN_CTX *ctx) | |
340 | { | |
341 | /* For local blinding, unblind is set to NULL, and BN_BLINDING_invert_ex | |
342 | * will use the unblinding factor stored in BN_BLINDING. | |
343 | * If BN_BLINDING is shared between threads, unblind must be non-null: | |
344 | * BN_BLINDING_invert_ex will then use the local unblinding factor, | |
345 | * and will only read the modulus from BN_BLINDING. | |
346 | * In both cases it's safe to access the blinding without a lock. | |
347 | */ | |
348 | return BN_BLINDING_invert_ex(f, unblind, b, ctx); | |
349 | } | |
5679bcce | 350 | |
24cff6ce | 351 | /* signing */ |
29c1f061 | 352 | static int RSA_eay_private_encrypt(int flen, const unsigned char *from, |
6b691a5c | 353 | unsigned char *to, RSA *rsa, int padding) |
58964a49 | 354 | { |
e5641d7f | 355 | BIGNUM *f, *ret, *res; |
58964a49 RE |
356 | int i,j,k,num=0,r= -1; |
357 | unsigned char *buf=NULL; | |
358 | BN_CTX *ctx=NULL; | |
5679bcce | 359 | int local_blinding = 0; |
e5641d7f BM |
360 | /* Used only if the blinding structure is shared. A non-NULL unblind |
361 | * instructs rsa_blinding_convert() and rsa_blinding_invert() to store | |
362 | * the unblinding factor outside the blinding structure. */ | |
363 | BIGNUM *unblind = NULL; | |
5679bcce | 364 | BN_BLINDING *blinding = NULL; |
58964a49 RE |
365 | |
366 | if ((ctx=BN_CTX_new()) == NULL) goto err; | |
46ef873f | 367 | BN_CTX_start(ctx); |
800e400d | 368 | f = BN_CTX_get(ctx); |
46ef873f | 369 | ret = BN_CTX_get(ctx); |
800e400d | 370 | num = BN_num_bytes(rsa->n); |
46ef873f GT |
371 | buf = OPENSSL_malloc(num); |
372 | if(!f || !ret || !buf) | |
58964a49 RE |
373 | { |
374 | RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,ERR_R_MALLOC_FAILURE); | |
375 | goto err; | |
376 | } | |
377 | ||
378 | switch (padding) | |
379 | { | |
380 | case RSA_PKCS1_PADDING: | |
381 | i=RSA_padding_add_PKCS1_type_1(buf,num,from,flen); | |
382 | break; | |
499fca2d DSH |
383 | case RSA_X931_PADDING: |
384 | i=RSA_padding_add_X931(buf,num,from,flen); | |
385 | break; | |
58964a49 RE |
386 | case RSA_NO_PADDING: |
387 | i=RSA_padding_add_none(buf,num,from,flen); | |
388 | break; | |
389 | case RSA_SSLV23_PADDING: | |
390 | default: | |
391 | RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,RSA_R_UNKNOWN_PADDING_TYPE); | |
392 | goto err; | |
393 | } | |
394 | if (i <= 0) goto err; | |
395 | ||
46ef873f | 396 | if (BN_bin2bn(buf,num,f) == NULL) goto err; |
24cff6ce | 397 | |
46ef873f | 398 | if (BN_ucmp(f, rsa->n) >= 0) |
24cff6ce BM |
399 | { |
400 | /* usually the padding functions would catch this */ | |
401 | RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,RSA_R_DATA_TOO_LARGE_FOR_MODULUS); | |
402 | goto err; | |
403 | } | |
58964a49 | 404 | |
c554155b | 405 | if (!(rsa->flags & RSA_FLAG_NO_BLINDING)) |
5679bcce | 406 | { |
675f605d | 407 | blinding = rsa_get_blinding(rsa, &local_blinding, ctx); |
5679bcce BM |
408 | if (blinding == NULL) |
409 | { | |
410 | RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, ERR_R_INTERNAL_ERROR); | |
411 | goto err; | |
412 | } | |
413 | } | |
414 | ||
415 | if (blinding != NULL) | |
e5641d7f BM |
416 | { |
417 | if (!local_blinding && ((unblind = BN_CTX_get(ctx)) == NULL)) | |
418 | { | |
419 | RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,ERR_R_MALLOC_FAILURE); | |
420 | goto err; | |
421 | } | |
422 | if (!rsa_blinding_convert(blinding, f, unblind, ctx)) | |
800e400d | 423 | goto err; |
e5641d7f | 424 | } |
58964a49 | 425 | |
770d19b8 DSH |
426 | if ( (rsa->flags & RSA_FLAG_EXT_PKEY) || |
427 | ((rsa->p != NULL) && | |
58964a49 RE |
428 | (rsa->q != NULL) && |
429 | (rsa->dmp1 != NULL) && | |
430 | (rsa->dmq1 != NULL) && | |
770d19b8 | 431 | (rsa->iqmp != NULL)) ) |
46a64376 BM |
432 | { |
433 | if (!rsa->meth->rsa_mod_exp(ret, f, rsa, ctx)) goto err; | |
434 | } | |
58964a49 RE |
435 | else |
436 | { | |
18125f7f | 437 | BIGNUM *d = NULL, *local_d = NULL; |
46a64376 | 438 | |
bd31fb21 | 439 | if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) |
46a64376 | 440 | { |
18125f7f MC |
441 | local_d = d = BN_new(); |
442 | if(!d) | |
443 | { | |
444 | RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,ERR_R_MALLOC_FAILURE); | |
445 | goto err; | |
446 | } | |
bd31fb21 | 447 | BN_with_flags(d, rsa->d, BN_FLG_CONSTTIME); |
46a64376 BM |
448 | } |
449 | else | |
7c9882eb | 450 | d= rsa->d; |
46a64376 | 451 | |
db99c525 BM |
452 | if (rsa->flags & RSA_FLAG_CACHE_PUBLIC) |
453 | if(!BN_MONT_CTX_set_locked(&rsa->_method_mod_n, CRYPTO_LOCK_RSA, rsa->n, ctx)) | |
18125f7f MC |
454 | { |
455 | if(local_d) BN_free(local_d); | |
db99c525 | 456 | goto err; |
18125f7f | 457 | } |
46a64376 BM |
458 | |
459 | if (!rsa->meth->bn_mod_exp(ret,f,d,rsa->n,ctx, | |
18125f7f MC |
460 | rsa->_method_mod_n)) |
461 | { | |
462 | if(local_d) BN_free(local_d); | |
463 | goto err; | |
464 | } | |
465 | if(local_d) BN_free(local_d); | |
58964a49 RE |
466 | } |
467 | ||
5679bcce | 468 | if (blinding) |
e5641d7f | 469 | if (!rsa_blinding_invert(blinding, ret, unblind, ctx)) |
800e400d | 470 | goto err; |
58964a49 | 471 | |
499fca2d DSH |
472 | if (padding == RSA_X931_PADDING) |
473 | { | |
474 | BN_sub(f, rsa->n, ret); | |
fdea4fff | 475 | if (BN_cmp(ret, f) > 0) |
499fca2d DSH |
476 | res = f; |
477 | else | |
478 | res = ret; | |
479 | } | |
480 | else | |
481 | res = ret; | |
482 | ||
58964a49 RE |
483 | /* put in leading 0 bytes if the number is less than the |
484 | * length of the modulus */ | |
499fca2d DSH |
485 | j=BN_num_bytes(res); |
486 | i=BN_bn2bin(res,&(to[num-j])); | |
58964a49 RE |
487 | for (k=0; k<(num-i); k++) |
488 | to[k]=0; | |
489 | ||
490 | r=num; | |
491 | err: | |
46ef873f GT |
492 | if (ctx != NULL) |
493 | { | |
494 | BN_CTX_end(ctx); | |
495 | BN_CTX_free(ctx); | |
496 | } | |
58964a49 RE |
497 | if (buf != NULL) |
498 | { | |
4579924b | 499 | OPENSSL_cleanse(buf,num); |
26a3a48d | 500 | OPENSSL_free(buf); |
58964a49 RE |
501 | } |
502 | return(r); | |
503 | } | |
504 | ||
29c1f061 | 505 | static int RSA_eay_private_decrypt(int flen, const unsigned char *from, |
6b691a5c | 506 | unsigned char *to, RSA *rsa, int padding) |
58964a49 | 507 | { |
e5641d7f | 508 | BIGNUM *f, *ret; |
58964a49 RE |
509 | int j,num=0,r= -1; |
510 | unsigned char *p; | |
511 | unsigned char *buf=NULL; | |
512 | BN_CTX *ctx=NULL; | |
5679bcce | 513 | int local_blinding = 0; |
e5641d7f BM |
514 | /* Used only if the blinding structure is shared. A non-NULL unblind |
515 | * instructs rsa_blinding_convert() and rsa_blinding_invert() to store | |
516 | * the unblinding factor outside the blinding structure. */ | |
517 | BIGNUM *unblind = NULL; | |
5679bcce | 518 | BN_BLINDING *blinding = NULL; |
58964a49 | 519 | |
46ef873f GT |
520 | if((ctx = BN_CTX_new()) == NULL) goto err; |
521 | BN_CTX_start(ctx); | |
800e400d | 522 | f = BN_CTX_get(ctx); |
46ef873f | 523 | ret = BN_CTX_get(ctx); |
800e400d | 524 | num = BN_num_bytes(rsa->n); |
46ef873f GT |
525 | buf = OPENSSL_malloc(num); |
526 | if(!f || !ret || !buf) | |
58964a49 RE |
527 | { |
528 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,ERR_R_MALLOC_FAILURE); | |
529 | goto err; | |
530 | } | |
531 | ||
657e60fa | 532 | /* This check was for equality but PGP does evil things |
58964a49 RE |
533 | * and chops off the top '0' bytes */ |
534 | if (flen > num) | |
535 | { | |
536 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_DATA_GREATER_THAN_MOD_LEN); | |
537 | goto err; | |
538 | } | |
539 | ||
540 | /* make data into a big number */ | |
46ef873f | 541 | if (BN_bin2bn(from,(int)flen,f) == NULL) goto err; |
58964a49 | 542 | |
46ef873f | 543 | if (BN_ucmp(f, rsa->n) >= 0) |
24cff6ce BM |
544 | { |
545 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_DATA_TOO_LARGE_FOR_MODULUS); | |
546 | goto err; | |
547 | } | |
548 | ||
c554155b | 549 | if (!(rsa->flags & RSA_FLAG_NO_BLINDING)) |
5679bcce | 550 | { |
675f605d | 551 | blinding = rsa_get_blinding(rsa, &local_blinding, ctx); |
5679bcce BM |
552 | if (blinding == NULL) |
553 | { | |
8afca8d9 | 554 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT, ERR_R_INTERNAL_ERROR); |
5679bcce BM |
555 | goto err; |
556 | } | |
557 | } | |
558 | ||
559 | if (blinding != NULL) | |
e5641d7f BM |
560 | { |
561 | if (!local_blinding && ((unblind = BN_CTX_get(ctx)) == NULL)) | |
562 | { | |
563 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,ERR_R_MALLOC_FAILURE); | |
800e400d | 564 | goto err; |
e5641d7f BM |
565 | } |
566 | if (!rsa_blinding_convert(blinding, f, unblind, ctx)) | |
567 | goto err; | |
568 | } | |
58964a49 RE |
569 | |
570 | /* do the decrypt */ | |
770d19b8 DSH |
571 | if ( (rsa->flags & RSA_FLAG_EXT_PKEY) || |
572 | ((rsa->p != NULL) && | |
58964a49 RE |
573 | (rsa->q != NULL) && |
574 | (rsa->dmp1 != NULL) && | |
575 | (rsa->dmq1 != NULL) && | |
770d19b8 | 576 | (rsa->iqmp != NULL)) ) |
46a64376 BM |
577 | { |
578 | if (!rsa->meth->rsa_mod_exp(ret, f, rsa, ctx)) goto err; | |
579 | } | |
58964a49 RE |
580 | else |
581 | { | |
18125f7f | 582 | BIGNUM *d = NULL, *local_d = NULL; |
46a64376 | 583 | |
bd31fb21 | 584 | if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) |
46a64376 | 585 | { |
18125f7f MC |
586 | local_d = d = BN_new(); |
587 | if(!d) | |
588 | { | |
589 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,ERR_R_MALLOC_FAILURE); | |
590 | goto err; | |
591 | } | |
bd31fb21 | 592 | BN_with_flags(d, rsa->d, BN_FLG_CONSTTIME); |
46a64376 BM |
593 | } |
594 | else | |
595 | d = rsa->d; | |
596 | ||
db99c525 BM |
597 | if (rsa->flags & RSA_FLAG_CACHE_PUBLIC) |
598 | if (!BN_MONT_CTX_set_locked(&rsa->_method_mod_n, CRYPTO_LOCK_RSA, rsa->n, ctx)) | |
18125f7f MC |
599 | { |
600 | if(local_d) BN_free(local_d); | |
db99c525 | 601 | goto err; |
18125f7f | 602 | } |
46a64376 | 603 | if (!rsa->meth->bn_mod_exp(ret,f,d,rsa->n,ctx, |
b12753df | 604 | rsa->_method_mod_n)) |
18125f7f MC |
605 | { |
606 | if(local_d) BN_free(local_d); | |
607 | goto err; | |
608 | } | |
609 | if(local_d) BN_free(local_d); | |
58964a49 RE |
610 | } |
611 | ||
5679bcce | 612 | if (blinding) |
e5641d7f | 613 | if (!rsa_blinding_invert(blinding, ret, unblind, ctx)) |
800e400d | 614 | goto err; |
58964a49 RE |
615 | |
616 | p=buf; | |
46ef873f | 617 | j=BN_bn2bin(ret,p); /* j is only used with no-padding mode */ |
58964a49 RE |
618 | |
619 | switch (padding) | |
620 | { | |
621 | case RSA_PKCS1_PADDING: | |
dfeab068 | 622 | r=RSA_padding_check_PKCS1_type_2(to,num,buf,j,num); |
58964a49 | 623 | break; |
cf1b7d96 | 624 | #ifndef OPENSSL_NO_SHA |
2440d8b1 | 625 | case RSA_PKCS1_OAEP_PADDING: |
a4949896 | 626 | r=RSA_padding_check_PKCS1_OAEP(to,num,buf,j,num,NULL,0); |
2440d8b1 | 627 | break; |
79df9d62 | 628 | #endif |
a4949896 | 629 | case RSA_SSLV23_PADDING: |
dfeab068 | 630 | r=RSA_padding_check_SSLv23(to,num,buf,j,num); |
58964a49 RE |
631 | break; |
632 | case RSA_NO_PADDING: | |
dfeab068 | 633 | r=RSA_padding_check_none(to,num,buf,j,num); |
58964a49 RE |
634 | break; |
635 | default: | |
636 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_UNKNOWN_PADDING_TYPE); | |
637 | goto err; | |
638 | } | |
639 | if (r < 0) | |
640 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_PADDING_CHECK_FAILED); | |
641 | ||
642 | err: | |
46ef873f GT |
643 | if (ctx != NULL) |
644 | { | |
645 | BN_CTX_end(ctx); | |
646 | BN_CTX_free(ctx); | |
647 | } | |
58964a49 RE |
648 | if (buf != NULL) |
649 | { | |
4579924b | 650 | OPENSSL_cleanse(buf,num); |
26a3a48d | 651 | OPENSSL_free(buf); |
58964a49 RE |
652 | } |
653 | return(r); | |
654 | } | |
655 | ||
24cff6ce | 656 | /* signature verification */ |
29c1f061 | 657 | static int RSA_eay_public_decrypt(int flen, const unsigned char *from, |
6b691a5c | 658 | unsigned char *to, RSA *rsa, int padding) |
58964a49 | 659 | { |
46ef873f | 660 | BIGNUM *f,*ret; |
58964a49 RE |
661 | int i,num=0,r= -1; |
662 | unsigned char *p; | |
663 | unsigned char *buf=NULL; | |
664 | BN_CTX *ctx=NULL; | |
665 | ||
5e3225cc BM |
666 | if (BN_num_bits(rsa->n) > OPENSSL_RSA_MAX_MODULUS_BITS) |
667 | { | |
668 | RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, RSA_R_MODULUS_TOO_LARGE); | |
669 | return -1; | |
670 | } | |
671 | ||
672 | if (BN_ucmp(rsa->n, rsa->e) <= 0) | |
673 | { | |
674 | RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, RSA_R_BAD_E_VALUE); | |
675 | return -1; | |
676 | } | |
677 | ||
678 | /* for large moduli, enforce exponent limit */ | |
679 | if (BN_num_bits(rsa->n) > OPENSSL_RSA_SMALL_MODULUS_BITS) | |
680 | { | |
681 | if (BN_num_bits(rsa->e) > OPENSSL_RSA_MAX_PUBEXP_BITS) | |
682 | { | |
683 | RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, RSA_R_BAD_E_VALUE); | |
684 | return -1; | |
685 | } | |
686 | } | |
687 | ||
46ef873f GT |
688 | if((ctx = BN_CTX_new()) == NULL) goto err; |
689 | BN_CTX_start(ctx); | |
690 | f = BN_CTX_get(ctx); | |
691 | ret = BN_CTX_get(ctx); | |
58964a49 | 692 | num=BN_num_bytes(rsa->n); |
46ef873f GT |
693 | buf = OPENSSL_malloc(num); |
694 | if(!f || !ret || !buf) | |
58964a49 RE |
695 | { |
696 | RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,ERR_R_MALLOC_FAILURE); | |
697 | goto err; | |
698 | } | |
699 | ||
657e60fa | 700 | /* This check was for equality but PGP does evil things |
58964a49 RE |
701 | * and chops off the top '0' bytes */ |
702 | if (flen > num) | |
703 | { | |
704 | RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_DATA_GREATER_THAN_MOD_LEN); | |
705 | goto err; | |
706 | } | |
707 | ||
46ef873f | 708 | if (BN_bin2bn(from,flen,f) == NULL) goto err; |
24cff6ce | 709 | |
46ef873f | 710 | if (BN_ucmp(f, rsa->n) >= 0) |
24cff6ce BM |
711 | { |
712 | RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_DATA_TOO_LARGE_FOR_MODULUS); | |
713 | goto err; | |
714 | } | |
715 | ||
db99c525 BM |
716 | if (rsa->flags & RSA_FLAG_CACHE_PUBLIC) |
717 | if (!BN_MONT_CTX_set_locked(&rsa->_method_mod_n, CRYPTO_LOCK_RSA, rsa->n, ctx)) | |
718 | goto err; | |
79221bc2 | 719 | |
46ef873f | 720 | if (!rsa->meth->bn_mod_exp(ret,f,rsa->e,rsa->n,ctx, |
03f8b042 | 721 | rsa->_method_mod_n)) goto err; |
58964a49 | 722 | |
18125f7f | 723 | if ((padding == RSA_X931_PADDING) && ((bn_get_words(ret)[0] & 0xf) != 12)) |
776654ad | 724 | if (!BN_sub(ret, rsa->n, ret)) goto err; |
499fca2d | 725 | |
58964a49 | 726 | p=buf; |
46ef873f | 727 | i=BN_bn2bin(ret,p); |
58964a49 RE |
728 | |
729 | switch (padding) | |
730 | { | |
731 | case RSA_PKCS1_PADDING: | |
dfeab068 | 732 | r=RSA_padding_check_PKCS1_type_1(to,num,buf,i,num); |
58964a49 | 733 | break; |
499fca2d DSH |
734 | case RSA_X931_PADDING: |
735 | r=RSA_padding_check_X931(to,num,buf,i,num); | |
736 | break; | |
58964a49 | 737 | case RSA_NO_PADDING: |
dfeab068 | 738 | r=RSA_padding_check_none(to,num,buf,i,num); |
58964a49 RE |
739 | break; |
740 | default: | |
741 | RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_UNKNOWN_PADDING_TYPE); | |
742 | goto err; | |
743 | } | |
744 | if (r < 0) | |
745 | RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_PADDING_CHECK_FAILED); | |
746 | ||
747 | err: | |
46ef873f GT |
748 | if (ctx != NULL) |
749 | { | |
750 | BN_CTX_end(ctx); | |
751 | BN_CTX_free(ctx); | |
752 | } | |
58964a49 RE |
753 | if (buf != NULL) |
754 | { | |
4579924b | 755 | OPENSSL_cleanse(buf,num); |
26a3a48d | 756 | OPENSSL_free(buf); |
58964a49 RE |
757 | } |
758 | return(r); | |
759 | } | |
760 | ||
46ef873f | 761 | static int RSA_eay_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx) |
58964a49 | 762 | { |
46ef873f | 763 | BIGNUM *r1,*m1,*vrfy; |
18125f7f | 764 | BIGNUM *local_dmp1, *local_dmq1, *local_c, *local_r1; |
bd31fb21 | 765 | BIGNUM *dmp1,*dmq1,*c,*pr1; |
58964a49 | 766 | int ret=0; |
58964a49 | 767 | |
18125f7f MC |
768 | |
769 | local_dmp1 = BN_new(); | |
770 | local_dmq1 = BN_new(); | |
771 | local_c = BN_new(); | |
772 | local_r1 = BN_new(); | |
773 | if(!local_dmp1 || !local_dmq1 || !local_c || !local_r1) | |
774 | goto err; | |
775 | ||
46ef873f GT |
776 | BN_CTX_start(ctx); |
777 | r1 = BN_CTX_get(ctx); | |
778 | m1 = BN_CTX_get(ctx); | |
779 | vrfy = BN_CTX_get(ctx); | |
58964a49 | 780 | |
7c9882eb | 781 | { |
18125f7f | 782 | BIGNUM *local_p = NULL, *local_q = NULL; |
7c9882eb | 783 | BIGNUM *p = NULL, *q = NULL; |
bd31fb21 | 784 | |
7c9882eb BM |
785 | /* Make sure BN_mod_inverse in Montgomery intialization uses the |
786 | * BN_FLG_CONSTTIME flag (unless RSA_FLAG_NO_CONSTTIME is set) | |
787 | */ | |
788 | if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) | |
789 | { | |
18125f7f MC |
790 | local_p = p = BN_new(); |
791 | if(!p) goto err; | |
7c9882eb BM |
792 | BN_with_flags(p, rsa->p, BN_FLG_CONSTTIME); |
793 | ||
18125f7f MC |
794 | local_q = q = BN_new(); |
795 | if(!q) | |
796 | { | |
797 | BN_free(local_p); | |
798 | goto err; | |
799 | } | |
7c9882eb BM |
800 | BN_with_flags(q, rsa->q, BN_FLG_CONSTTIME); |
801 | } | |
802 | else | |
803 | { | |
804 | p = rsa->p; | |
805 | q = rsa->q; | |
806 | } | |
807 | ||
db99c525 BM |
808 | if (rsa->flags & RSA_FLAG_CACHE_PRIVATE) |
809 | { | |
18125f7f MC |
810 | if (!BN_MONT_CTX_set_locked(&rsa->_method_mod_p, CRYPTO_LOCK_RSA, p, ctx) || !BN_MONT_CTX_set_locked(&rsa->_method_mod_q, CRYPTO_LOCK_RSA, q, ctx)) |
811 | { | |
812 | if(local_p) BN_free(local_p); | |
813 | if(local_q) BN_free(local_q); | |
db99c525 | 814 | goto err; |
18125f7f | 815 | } |
db99c525 | 816 | } |
18125f7f MC |
817 | if(local_p) BN_free(local_p); |
818 | if(local_q) BN_free(local_q); | |
7c9882eb | 819 | } |
bd31fb21 | 820 | |
db99c525 BM |
821 | if (rsa->flags & RSA_FLAG_CACHE_PUBLIC) |
822 | if (!BN_MONT_CTX_set_locked(&rsa->_method_mod_n, CRYPTO_LOCK_RSA, rsa->n, ctx)) | |
823 | goto err; | |
126fe085 | 824 | |
bd31fb21 BM |
825 | /* compute I mod q */ |
826 | if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) | |
827 | { | |
18125f7f | 828 | c = local_c; |
bd31fb21 BM |
829 | BN_with_flags(c, I, BN_FLG_CONSTTIME); |
830 | if (!BN_mod(r1,c,rsa->q,ctx)) goto err; | |
831 | } | |
832 | else | |
833 | { | |
834 | if (!BN_mod(r1,I,rsa->q,ctx)) goto err; | |
835 | } | |
836 | ||
837 | /* compute r1^dmq1 mod q */ | |
838 | if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) | |
46a64376 | 839 | { |
18125f7f | 840 | dmq1 = local_dmq1; |
bd31fb21 | 841 | BN_with_flags(dmq1, rsa->dmq1, BN_FLG_CONSTTIME); |
46a64376 BM |
842 | } |
843 | else | |
844 | dmq1 = rsa->dmq1; | |
845 | if (!rsa->meth->bn_mod_exp(m1,r1,dmq1,rsa->q,ctx, | |
03f8b042 | 846 | rsa->_method_mod_q)) goto err; |
58964a49 | 847 | |
bd31fb21 BM |
848 | /* compute I mod p */ |
849 | if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) | |
850 | { | |
18125f7f | 851 | c = local_c; |
bd31fb21 BM |
852 | BN_with_flags(c, I, BN_FLG_CONSTTIME); |
853 | if (!BN_mod(r1,c,rsa->p,ctx)) goto err; | |
854 | } | |
855 | else | |
856 | { | |
857 | if (!BN_mod(r1,I,rsa->p,ctx)) goto err; | |
858 | } | |
859 | ||
860 | /* compute r1^dmp1 mod p */ | |
861 | if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) | |
46a64376 | 862 | { |
18125f7f | 863 | dmp1 = local_dmp1; |
bd31fb21 | 864 | BN_with_flags(dmp1, rsa->dmp1, BN_FLG_CONSTTIME); |
46a64376 BM |
865 | } |
866 | else | |
867 | dmp1 = rsa->dmp1; | |
868 | if (!rsa->meth->bn_mod_exp(r0,r1,dmp1,rsa->p,ctx, | |
03f8b042 | 869 | rsa->_method_mod_p)) goto err; |
58964a49 | 870 | |
46ef873f | 871 | if (!BN_sub(r0,r0,m1)) goto err; |
dfeab068 RE |
872 | /* This will help stop the size of r0 increasing, which does |
873 | * affect the multiply if it optimised for a power of 2 size */ | |
ff22e913 | 874 | if (BN_is_negative(r0)) |
dfeab068 | 875 | if (!BN_add(r0,r0,rsa->p)) goto err; |
58964a49 | 876 | |
46ef873f | 877 | if (!BN_mul(r1,r0,rsa->iqmp,ctx)) goto err; |
bd31fb21 BM |
878 | |
879 | /* Turn BN_FLG_CONSTTIME flag on before division operation */ | |
880 | if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) | |
881 | { | |
18125f7f | 882 | pr1 = local_r1; |
bd31fb21 BM |
883 | BN_with_flags(pr1, r1, BN_FLG_CONSTTIME); |
884 | } | |
885 | else | |
886 | pr1 = r1; | |
887 | if (!BN_mod(r0,pr1,rsa->p,ctx)) goto err; | |
888 | ||
abd4c915 | 889 | /* If p < q it is occasionally possible for the correction of |
2440d8b1 | 890 | * adding 'p' if r0 is negative above to leave the result still |
abd4c915 DSH |
891 | * negative. This can break the private key operations: the following |
892 | * second correction should *always* correct this rare occurrence. | |
893 | * This will *never* happen with OpenSSL generated keys because | |
2440d8b1 BM |
894 | * they ensure p > q [steve] |
895 | */ | |
ff22e913 | 896 | if (BN_is_negative(r0)) |
abd4c915 | 897 | if (!BN_add(r0,r0,rsa->p)) goto err; |
46ef873f GT |
898 | if (!BN_mul(r1,r0,rsa->q,ctx)) goto err; |
899 | if (!BN_add(r0,r1,m1)) goto err; | |
58964a49 | 900 | |
6a5b52ef UM |
901 | if (rsa->e && rsa->n) |
902 | { | |
46ef873f | 903 | if (!rsa->meth->bn_mod_exp(vrfy,r0,rsa->e,rsa->n,ctx,rsa->_method_mod_n)) goto err; |
81d1998e GT |
904 | /* If 'I' was greater than (or equal to) rsa->n, the operation |
905 | * will be equivalent to using 'I mod n'. However, the result of | |
906 | * the verify will *always* be less than 'n' so we don't check | |
907 | * for absolute equality, just congruency. */ | |
46ef873f GT |
908 | if (!BN_sub(vrfy, vrfy, I)) goto err; |
909 | if (!BN_mod(vrfy, vrfy, rsa->n, ctx)) goto err; | |
ff22e913 | 910 | if (BN_is_negative(vrfy)) |
46ef873f GT |
911 | if (!BN_add(vrfy, vrfy, rsa->n)) goto err; |
912 | if (!BN_is_zero(vrfy)) | |
46a64376 | 913 | { |
81d1998e GT |
914 | /* 'I' and 'vrfy' aren't congruent mod n. Don't leak |
915 | * miscalculated CRT output, just do a raw (slower) | |
916 | * mod_exp and return that instead. */ | |
46a64376 | 917 | |
18125f7f | 918 | BIGNUM *local_d = NULL; |
46a64376 BM |
919 | BIGNUM *d = NULL; |
920 | ||
bd31fb21 | 921 | if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) |
46a64376 | 922 | { |
18125f7f MC |
923 | local_d = d = BN_new(); |
924 | if(!d) goto err; | |
bd31fb21 | 925 | BN_with_flags(d, rsa->d, BN_FLG_CONSTTIME); |
46a64376 BM |
926 | } |
927 | else | |
928 | d = rsa->d; | |
929 | if (!rsa->meth->bn_mod_exp(r0,I,d,rsa->n,ctx, | |
18125f7f MC |
930 | rsa->_method_mod_n)) |
931 | { | |
932 | if(local_d) BN_free(local_d); | |
933 | goto err; | |
934 | } | |
935 | ||
936 | if(local_d) BN_free(local_d); | |
46a64376 | 937 | } |
6a5b52ef | 938 | } |
58964a49 RE |
939 | ret=1; |
940 | err: | |
18125f7f MC |
941 | if(local_dmp1) BN_free(local_dmp1); |
942 | if(local_dmq1) BN_free(local_dmq1); | |
943 | if(local_c) BN_free(local_c); | |
944 | if(local_r1) BN_free(local_r1); | |
46ef873f | 945 | BN_CTX_end(ctx); |
58964a49 RE |
946 | return(ret); |
947 | } | |
948 | ||
6b691a5c | 949 | static int RSA_eay_init(RSA *rsa) |
58964a49 RE |
950 | { |
951 | rsa->flags|=RSA_FLAG_CACHE_PUBLIC|RSA_FLAG_CACHE_PRIVATE; | |
952 | return(1); | |
953 | } | |
954 | ||
6b691a5c | 955 | static int RSA_eay_finish(RSA *rsa) |
58964a49 | 956 | { |
03f8b042 BL |
957 | if (rsa->_method_mod_n != NULL) |
958 | BN_MONT_CTX_free(rsa->_method_mod_n); | |
959 | if (rsa->_method_mod_p != NULL) | |
960 | BN_MONT_CTX_free(rsa->_method_mod_p); | |
961 | if (rsa->_method_mod_q != NULL) | |
962 | BN_MONT_CTX_free(rsa->_method_mod_q); | |
58964a49 RE |
963 | return(1); |
964 | } | |
965 | ||
c1cd88a0 | 966 | #endif |