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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 BM |
58 | /* ==================================================================== |
59 | * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved. | |
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 RE |
111 | |
112 | #include <stdio.h> | |
113 | #include "cryptlib.h" | |
ec577822 BM |
114 | #include <openssl/bn.h> |
115 | #include <openssl/rsa.h> | |
116 | #include <openssl/rand.h> | |
58964a49 | 117 | |
c1cd88a0 DSH |
118 | #ifndef RSA_NULL |
119 | ||
29c1f061 | 120 | static int RSA_eay_public_encrypt(int flen, const unsigned char *from, |
58964a49 | 121 | unsigned char *to, RSA *rsa,int padding); |
29c1f061 | 122 | static int RSA_eay_private_encrypt(int flen, const unsigned char *from, |
58964a49 | 123 | unsigned char *to, RSA *rsa,int padding); |
29c1f061 | 124 | static int RSA_eay_public_decrypt(int flen, const unsigned char *from, |
58964a49 | 125 | unsigned char *to, RSA *rsa,int padding); |
29c1f061 | 126 | static int RSA_eay_private_decrypt(int flen, const unsigned char *from, |
58964a49 | 127 | unsigned char *to, RSA *rsa,int padding); |
46ef873f | 128 | static int RSA_eay_mod_exp(BIGNUM *r0, const BIGNUM *i, RSA *rsa, BN_CTX *ctx); |
58964a49 RE |
129 | static int RSA_eay_init(RSA *rsa); |
130 | static int RSA_eay_finish(RSA *rsa); | |
58964a49 RE |
131 | static RSA_METHOD rsa_pkcs1_eay_meth={ |
132 | "Eric Young's PKCS#1 RSA", | |
133 | RSA_eay_public_encrypt, | |
24cff6ce BM |
134 | RSA_eay_public_decrypt, /* signature verification */ |
135 | RSA_eay_private_encrypt, /* signing */ | |
58964a49 RE |
136 | RSA_eay_private_decrypt, |
137 | RSA_eay_mod_exp, | |
123d24d6 | 138 | BN_mod_exp_mont, /* XXX probably we should not use Montgomery if e == 3 */ |
58964a49 RE |
139 | RSA_eay_init, |
140 | RSA_eay_finish, | |
be6d7700 | 141 | 0, /* flags */ |
58964a49 | 142 | NULL, |
be6d7700 | 143 | 0, /* rsa_sign */ |
2814c629 GT |
144 | 0, /* rsa_verify */ |
145 | NULL /* rsa_keygen */ | |
58964a49 RE |
146 | }; |
147 | ||
7be7c2ed | 148 | const RSA_METHOD *RSA_PKCS1_SSLeay(void) |
58964a49 RE |
149 | { |
150 | return(&rsa_pkcs1_eay_meth); | |
151 | } | |
152 | ||
79221bc2 GT |
153 | /* Usage example; |
154 | * MONT_HELPER(rsa, bn_ctx, p, rsa->flags & RSA_FLAG_CACHE_PRIVATE, goto err); | |
155 | */ | |
156 | #define MONT_HELPER(rsa, ctx, m, pre_cond, err_instr) \ | |
157 | if((pre_cond) && ((rsa)->_method_mod_##m == NULL) && \ | |
6ec8e63a DSH |
158 | !BN_MONT_CTX_set_locked(&((rsa)->_method_mod_##m), \ |
159 | CRYPTO_LOCK_RSA, \ | |
79221bc2 GT |
160 | (rsa)->m, (ctx))) \ |
161 | err_instr | |
162 | ||
29c1f061 | 163 | static int RSA_eay_public_encrypt(int flen, const unsigned char *from, |
6b691a5c | 164 | unsigned char *to, RSA *rsa, int padding) |
58964a49 | 165 | { |
46ef873f | 166 | BIGNUM *f,*ret; |
58964a49 RE |
167 | int i,j,k,num=0,r= -1; |
168 | unsigned char *buf=NULL; | |
169 | BN_CTX *ctx=NULL; | |
170 | ||
171 | if ((ctx=BN_CTX_new()) == NULL) goto err; | |
46ef873f GT |
172 | BN_CTX_start(ctx); |
173 | f = BN_CTX_get(ctx); | |
174 | ret = BN_CTX_get(ctx); | |
58964a49 | 175 | num=BN_num_bytes(rsa->n); |
46ef873f GT |
176 | buf = OPENSSL_malloc(num); |
177 | if (!f || !ret || !buf) | |
58964a49 RE |
178 | { |
179 | RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT,ERR_R_MALLOC_FAILURE); | |
180 | goto err; | |
181 | } | |
182 | ||
183 | switch (padding) | |
184 | { | |
185 | case RSA_PKCS1_PADDING: | |
186 | i=RSA_padding_add_PKCS1_type_2(buf,num,from,flen); | |
187 | break; | |
cf1b7d96 | 188 | #ifndef OPENSSL_NO_SHA |
a4949896 BL |
189 | case RSA_PKCS1_OAEP_PADDING: |
190 | i=RSA_padding_add_PKCS1_OAEP(buf,num,from,flen,NULL,0); | |
191 | break; | |
79df9d62 | 192 | #endif |
58964a49 RE |
193 | case RSA_SSLV23_PADDING: |
194 | i=RSA_padding_add_SSLv23(buf,num,from,flen); | |
195 | break; | |
196 | case RSA_NO_PADDING: | |
197 | i=RSA_padding_add_none(buf,num,from,flen); | |
198 | break; | |
199 | default: | |
200 | RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT,RSA_R_UNKNOWN_PADDING_TYPE); | |
201 | goto err; | |
202 | } | |
203 | if (i <= 0) goto err; | |
204 | ||
46ef873f | 205 | if (BN_bin2bn(buf,num,f) == NULL) goto err; |
58964a49 | 206 | |
46ef873f | 207 | if (BN_ucmp(f, rsa->n) >= 0) |
24cff6ce BM |
208 | { |
209 | /* usually the padding functions would catch this */ | |
210 | RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT,RSA_R_DATA_TOO_LARGE_FOR_MODULUS); | |
211 | goto err; | |
212 | } | |
213 | ||
79221bc2 GT |
214 | MONT_HELPER(rsa, ctx, n, rsa->flags & RSA_FLAG_CACHE_PUBLIC, goto err); |
215 | ||
46ef873f | 216 | if (!rsa->meth->bn_mod_exp(ret,f,rsa->e,rsa->n,ctx, |
03f8b042 | 217 | rsa->_method_mod_n)) goto err; |
58964a49 RE |
218 | |
219 | /* put in leading 0 bytes if the number is less than the | |
220 | * length of the modulus */ | |
46ef873f GT |
221 | j=BN_num_bytes(ret); |
222 | i=BN_bn2bin(ret,&(to[num-j])); | |
58964a49 RE |
223 | for (k=0; k<(num-i); k++) |
224 | to[k]=0; | |
225 | ||
226 | r=num; | |
227 | err: | |
46ef873f GT |
228 | if (ctx != NULL) |
229 | { | |
230 | BN_CTX_end(ctx); | |
231 | BN_CTX_free(ctx); | |
232 | } | |
58964a49 RE |
233 | if (buf != NULL) |
234 | { | |
4579924b | 235 | OPENSSL_cleanse(buf,num); |
26a3a48d | 236 | OPENSSL_free(buf); |
58964a49 RE |
237 | } |
238 | return(r); | |
239 | } | |
240 | ||
800e400d NL |
241 | static BN_BLINDING *rsa_get_blinding(RSA *rsa, BIGNUM **r, int *local, BN_CTX *ctx) |
242 | { | |
243 | BN_BLINDING *ret; | |
c554155b | 244 | |
800e400d NL |
245 | if (rsa->blinding == NULL) |
246 | { | |
247 | if (rsa->blinding == NULL) | |
248 | { | |
249 | CRYPTO_w_lock(CRYPTO_LOCK_RSA); | |
250 | if (rsa->blinding == NULL) | |
251 | rsa->blinding = RSA_setup_blinding(rsa, ctx); | |
252 | CRYPTO_w_unlock(CRYPTO_LOCK_RSA); | |
253 | } | |
254 | } | |
c554155b | 255 | |
800e400d NL |
256 | ret = rsa->blinding; |
257 | if (ret == NULL) | |
258 | return NULL; | |
5679bcce | 259 | |
800e400d NL |
260 | if (BN_BLINDING_get_thread_id(ret) != CRYPTO_thread_id()) |
261 | { | |
262 | *local = 0; | |
263 | if (rsa->mt_blinding == NULL) | |
264 | { | |
265 | CRYPTO_w_lock(CRYPTO_LOCK_RSA); | |
266 | if (rsa->mt_blinding == NULL) | |
267 | rsa->mt_blinding = RSA_setup_blinding(rsa, ctx); | |
268 | CRYPTO_w_unlock(CRYPTO_LOCK_RSA); | |
269 | } | |
270 | ret = rsa->mt_blinding; | |
271 | } | |
272 | else | |
273 | *local = 1; | |
5679bcce | 274 | |
800e400d NL |
275 | return ret; |
276 | } | |
5679bcce | 277 | |
800e400d NL |
278 | static int rsa_blinding_convert(BN_BLINDING *b, int local, BIGNUM *f, |
279 | BIGNUM *r, BN_CTX *ctx) | |
280 | { | |
281 | if (local) | |
282 | return BN_BLINDING_convert_ex(f, NULL, b, ctx); | |
283 | else | |
5679bcce | 284 | { |
800e400d NL |
285 | int ret; |
286 | CRYPTO_w_lock(CRYPTO_LOCK_RSA_BLINDING); | |
287 | ret = BN_BLINDING_convert_ex(f, r, b, ctx); | |
288 | CRYPTO_w_unlock(CRYPTO_LOCK_RSA_BLINDING); | |
289 | return ret; | |
5679bcce | 290 | } |
800e400d NL |
291 | } |
292 | ||
293 | static int rsa_blinding_invert(BN_BLINDING *b, int local, BIGNUM *f, | |
294 | BIGNUM *r, BN_CTX *ctx) | |
295 | { | |
296 | if (local) | |
297 | return BN_BLINDING_invert_ex(f, NULL, b, ctx); | |
5679bcce BM |
298 | else |
299 | { | |
800e400d NL |
300 | int ret; |
301 | CRYPTO_r_lock(CRYPTO_LOCK_RSA_BLINDING); | |
302 | ret = BN_BLINDING_invert_ex(f, r, b, ctx); | |
303 | CRYPTO_r_unlock(CRYPTO_LOCK_RSA_BLINDING); | |
304 | return ret; | |
5679bcce | 305 | } |
800e400d | 306 | } |
5679bcce | 307 | |
24cff6ce | 308 | /* signing */ |
29c1f061 | 309 | static int RSA_eay_private_encrypt(int flen, const unsigned char *from, |
6b691a5c | 310 | unsigned char *to, RSA *rsa, int padding) |
58964a49 | 311 | { |
800e400d | 312 | BIGNUM *f, *ret, *br; |
58964a49 RE |
313 | int i,j,k,num=0,r= -1; |
314 | unsigned char *buf=NULL; | |
315 | BN_CTX *ctx=NULL; | |
5679bcce BM |
316 | int local_blinding = 0; |
317 | BN_BLINDING *blinding = NULL; | |
58964a49 RE |
318 | |
319 | if ((ctx=BN_CTX_new()) == NULL) goto err; | |
46ef873f | 320 | BN_CTX_start(ctx); |
800e400d NL |
321 | f = BN_CTX_get(ctx); |
322 | br = BN_CTX_get(ctx); | |
46ef873f | 323 | ret = BN_CTX_get(ctx); |
800e400d | 324 | num = BN_num_bytes(rsa->n); |
46ef873f GT |
325 | buf = OPENSSL_malloc(num); |
326 | if(!f || !ret || !buf) | |
58964a49 RE |
327 | { |
328 | RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,ERR_R_MALLOC_FAILURE); | |
329 | goto err; | |
330 | } | |
331 | ||
332 | switch (padding) | |
333 | { | |
334 | case RSA_PKCS1_PADDING: | |
335 | i=RSA_padding_add_PKCS1_type_1(buf,num,from,flen); | |
336 | break; | |
337 | case RSA_NO_PADDING: | |
338 | i=RSA_padding_add_none(buf,num,from,flen); | |
339 | break; | |
340 | case RSA_SSLV23_PADDING: | |
341 | default: | |
342 | RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,RSA_R_UNKNOWN_PADDING_TYPE); | |
343 | goto err; | |
344 | } | |
345 | if (i <= 0) goto err; | |
346 | ||
46ef873f | 347 | if (BN_bin2bn(buf,num,f) == NULL) goto err; |
24cff6ce | 348 | |
46ef873f | 349 | if (BN_ucmp(f, rsa->n) >= 0) |
24cff6ce BM |
350 | { |
351 | /* usually the padding functions would catch this */ | |
352 | RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,RSA_R_DATA_TOO_LARGE_FOR_MODULUS); | |
353 | goto err; | |
354 | } | |
58964a49 | 355 | |
c554155b | 356 | if (!(rsa->flags & RSA_FLAG_NO_BLINDING)) |
5679bcce | 357 | { |
800e400d | 358 | blinding = rsa_get_blinding(rsa, &br, &local_blinding, ctx); |
5679bcce BM |
359 | if (blinding == NULL) |
360 | { | |
361 | RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, ERR_R_INTERNAL_ERROR); | |
362 | goto err; | |
363 | } | |
364 | } | |
365 | ||
366 | if (blinding != NULL) | |
800e400d NL |
367 | if (!rsa_blinding_convert(blinding, local_blinding, f, br, ctx)) |
368 | goto err; | |
58964a49 | 369 | |
770d19b8 DSH |
370 | if ( (rsa->flags & RSA_FLAG_EXT_PKEY) || |
371 | ((rsa->p != NULL) && | |
58964a49 RE |
372 | (rsa->q != NULL) && |
373 | (rsa->dmp1 != NULL) && | |
374 | (rsa->dmq1 != NULL) && | |
770d19b8 | 375 | (rsa->iqmp != NULL)) ) |
46a64376 BM |
376 | { |
377 | if (!rsa->meth->rsa_mod_exp(ret, f, rsa, ctx)) goto err; | |
378 | } | |
58964a49 RE |
379 | else |
380 | { | |
46a64376 BM |
381 | BIGNUM local_d; |
382 | BIGNUM *d = NULL; | |
383 | ||
384 | if (!(rsa->flags & RSA_FLAG_NO_EXP_CONSTTIME)) | |
385 | { | |
386 | d = &local_d; | |
387 | BN_with_flags(d, rsa->d, BN_FLG_EXP_CONSTTIME); | |
388 | } | |
389 | else | |
390 | d = rsa->d; | |
391 | ||
b12753df | 392 | MONT_HELPER(rsa, ctx, n, rsa->flags & RSA_FLAG_CACHE_PUBLIC, goto err); |
46a64376 BM |
393 | |
394 | if (!rsa->meth->bn_mod_exp(ret,f,d,rsa->n,ctx, | |
b12753df | 395 | rsa->_method_mod_n)) goto err; |
58964a49 RE |
396 | } |
397 | ||
5679bcce | 398 | if (blinding) |
800e400d NL |
399 | if (!rsa_blinding_invert(blinding, local_blinding, ret, br, ctx)) |
400 | goto err; | |
58964a49 RE |
401 | |
402 | /* put in leading 0 bytes if the number is less than the | |
403 | * length of the modulus */ | |
46ef873f GT |
404 | j=BN_num_bytes(ret); |
405 | i=BN_bn2bin(ret,&(to[num-j])); | |
58964a49 RE |
406 | for (k=0; k<(num-i); k++) |
407 | to[k]=0; | |
408 | ||
409 | r=num; | |
410 | err: | |
46ef873f GT |
411 | if (ctx != NULL) |
412 | { | |
413 | BN_CTX_end(ctx); | |
414 | BN_CTX_free(ctx); | |
415 | } | |
58964a49 RE |
416 | if (buf != NULL) |
417 | { | |
4579924b | 418 | OPENSSL_cleanse(buf,num); |
26a3a48d | 419 | OPENSSL_free(buf); |
58964a49 RE |
420 | } |
421 | return(r); | |
422 | } | |
423 | ||
29c1f061 | 424 | static int RSA_eay_private_decrypt(int flen, const unsigned char *from, |
6b691a5c | 425 | unsigned char *to, RSA *rsa, int padding) |
58964a49 | 426 | { |
800e400d | 427 | BIGNUM *f, *ret, *br; |
58964a49 RE |
428 | int j,num=0,r= -1; |
429 | unsigned char *p; | |
430 | unsigned char *buf=NULL; | |
431 | BN_CTX *ctx=NULL; | |
5679bcce BM |
432 | int local_blinding = 0; |
433 | BN_BLINDING *blinding = NULL; | |
58964a49 | 434 | |
46ef873f GT |
435 | if((ctx = BN_CTX_new()) == NULL) goto err; |
436 | BN_CTX_start(ctx); | |
800e400d NL |
437 | f = BN_CTX_get(ctx); |
438 | br = BN_CTX_get(ctx); | |
46ef873f | 439 | ret = BN_CTX_get(ctx); |
800e400d | 440 | num = BN_num_bytes(rsa->n); |
46ef873f GT |
441 | buf = OPENSSL_malloc(num); |
442 | if(!f || !ret || !buf) | |
58964a49 RE |
443 | { |
444 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,ERR_R_MALLOC_FAILURE); | |
445 | goto err; | |
446 | } | |
447 | ||
657e60fa | 448 | /* This check was for equality but PGP does evil things |
58964a49 RE |
449 | * and chops off the top '0' bytes */ |
450 | if (flen > num) | |
451 | { | |
452 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_DATA_GREATER_THAN_MOD_LEN); | |
453 | goto err; | |
454 | } | |
455 | ||
456 | /* make data into a big number */ | |
46ef873f | 457 | if (BN_bin2bn(from,(int)flen,f) == NULL) goto err; |
58964a49 | 458 | |
46ef873f | 459 | if (BN_ucmp(f, rsa->n) >= 0) |
24cff6ce BM |
460 | { |
461 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_DATA_TOO_LARGE_FOR_MODULUS); | |
462 | goto err; | |
463 | } | |
464 | ||
c554155b | 465 | if (!(rsa->flags & RSA_FLAG_NO_BLINDING)) |
5679bcce | 466 | { |
800e400d | 467 | blinding = rsa_get_blinding(rsa, &br, &local_blinding, ctx); |
5679bcce BM |
468 | if (blinding == NULL) |
469 | { | |
8afca8d9 | 470 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT, ERR_R_INTERNAL_ERROR); |
5679bcce BM |
471 | goto err; |
472 | } | |
473 | } | |
474 | ||
475 | if (blinding != NULL) | |
800e400d NL |
476 | if (!rsa_blinding_convert(blinding, local_blinding, f, br, ctx)) |
477 | goto err; | |
58964a49 RE |
478 | |
479 | /* do the decrypt */ | |
770d19b8 DSH |
480 | if ( (rsa->flags & RSA_FLAG_EXT_PKEY) || |
481 | ((rsa->p != NULL) && | |
58964a49 RE |
482 | (rsa->q != NULL) && |
483 | (rsa->dmp1 != NULL) && | |
484 | (rsa->dmq1 != NULL) && | |
770d19b8 | 485 | (rsa->iqmp != NULL)) ) |
46a64376 BM |
486 | { |
487 | if (!rsa->meth->rsa_mod_exp(ret, f, rsa, ctx)) goto err; | |
488 | } | |
58964a49 RE |
489 | else |
490 | { | |
46a64376 BM |
491 | BIGNUM local_d; |
492 | BIGNUM *d = NULL; | |
493 | ||
494 | if (!(rsa->flags & RSA_FLAG_NO_EXP_CONSTTIME)) | |
495 | { | |
496 | d = &local_d; | |
497 | BN_with_flags(d, rsa->d, BN_FLG_EXP_CONSTTIME); | |
498 | } | |
499 | else | |
500 | d = rsa->d; | |
501 | ||
b12753df | 502 | MONT_HELPER(rsa, ctx, n, rsa->flags & RSA_FLAG_CACHE_PUBLIC, goto err); |
46a64376 | 503 | if (!rsa->meth->bn_mod_exp(ret,f,d,rsa->n,ctx, |
b12753df | 504 | rsa->_method_mod_n)) |
46a64376 | 505 | goto err; |
58964a49 RE |
506 | } |
507 | ||
5679bcce | 508 | if (blinding) |
800e400d NL |
509 | if (!rsa_blinding_invert(blinding, local_blinding, ret, br, ctx)) |
510 | goto err; | |
58964a49 RE |
511 | |
512 | p=buf; | |
46ef873f | 513 | j=BN_bn2bin(ret,p); /* j is only used with no-padding mode */ |
58964a49 RE |
514 | |
515 | switch (padding) | |
516 | { | |
517 | case RSA_PKCS1_PADDING: | |
dfeab068 | 518 | r=RSA_padding_check_PKCS1_type_2(to,num,buf,j,num); |
58964a49 | 519 | break; |
cf1b7d96 | 520 | #ifndef OPENSSL_NO_SHA |
a4949896 BL |
521 | case RSA_PKCS1_OAEP_PADDING: |
522 | r=RSA_padding_check_PKCS1_OAEP(to,num,buf,j,num,NULL,0); | |
523 | break; | |
79df9d62 | 524 | #endif |
a4949896 | 525 | case RSA_SSLV23_PADDING: |
dfeab068 | 526 | r=RSA_padding_check_SSLv23(to,num,buf,j,num); |
58964a49 RE |
527 | break; |
528 | case RSA_NO_PADDING: | |
dfeab068 | 529 | r=RSA_padding_check_none(to,num,buf,j,num); |
58964a49 RE |
530 | break; |
531 | default: | |
532 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_UNKNOWN_PADDING_TYPE); | |
533 | goto err; | |
534 | } | |
535 | if (r < 0) | |
536 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_PADDING_CHECK_FAILED); | |
537 | ||
538 | err: | |
46ef873f GT |
539 | if (ctx != NULL) |
540 | { | |
541 | BN_CTX_end(ctx); | |
542 | BN_CTX_free(ctx); | |
543 | } | |
58964a49 RE |
544 | if (buf != NULL) |
545 | { | |
4579924b | 546 | OPENSSL_cleanse(buf,num); |
26a3a48d | 547 | OPENSSL_free(buf); |
58964a49 RE |
548 | } |
549 | return(r); | |
550 | } | |
551 | ||
24cff6ce | 552 | /* signature verification */ |
29c1f061 | 553 | static int RSA_eay_public_decrypt(int flen, const unsigned char *from, |
6b691a5c | 554 | unsigned char *to, RSA *rsa, int padding) |
58964a49 | 555 | { |
46ef873f | 556 | BIGNUM *f,*ret; |
58964a49 RE |
557 | int i,num=0,r= -1; |
558 | unsigned char *p; | |
559 | unsigned char *buf=NULL; | |
560 | BN_CTX *ctx=NULL; | |
561 | ||
46ef873f GT |
562 | if((ctx = BN_CTX_new()) == NULL) goto err; |
563 | BN_CTX_start(ctx); | |
564 | f = BN_CTX_get(ctx); | |
565 | ret = BN_CTX_get(ctx); | |
58964a49 | 566 | num=BN_num_bytes(rsa->n); |
46ef873f GT |
567 | buf = OPENSSL_malloc(num); |
568 | if(!f || !ret || !buf) | |
58964a49 RE |
569 | { |
570 | RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,ERR_R_MALLOC_FAILURE); | |
571 | goto err; | |
572 | } | |
573 | ||
657e60fa | 574 | /* This check was for equality but PGP does evil things |
58964a49 RE |
575 | * and chops off the top '0' bytes */ |
576 | if (flen > num) | |
577 | { | |
578 | RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_DATA_GREATER_THAN_MOD_LEN); | |
579 | goto err; | |
580 | } | |
581 | ||
46ef873f | 582 | if (BN_bin2bn(from,flen,f) == NULL) goto err; |
24cff6ce | 583 | |
46ef873f | 584 | if (BN_ucmp(f, rsa->n) >= 0) |
24cff6ce BM |
585 | { |
586 | RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_DATA_TOO_LARGE_FOR_MODULUS); | |
587 | goto err; | |
588 | } | |
589 | ||
79221bc2 GT |
590 | MONT_HELPER(rsa, ctx, n, rsa->flags & RSA_FLAG_CACHE_PUBLIC, goto err); |
591 | ||
46ef873f | 592 | if (!rsa->meth->bn_mod_exp(ret,f,rsa->e,rsa->n,ctx, |
03f8b042 | 593 | rsa->_method_mod_n)) goto err; |
58964a49 RE |
594 | |
595 | p=buf; | |
46ef873f | 596 | i=BN_bn2bin(ret,p); |
58964a49 RE |
597 | |
598 | switch (padding) | |
599 | { | |
600 | case RSA_PKCS1_PADDING: | |
dfeab068 | 601 | r=RSA_padding_check_PKCS1_type_1(to,num,buf,i,num); |
58964a49 RE |
602 | break; |
603 | case RSA_NO_PADDING: | |
dfeab068 | 604 | r=RSA_padding_check_none(to,num,buf,i,num); |
58964a49 RE |
605 | break; |
606 | default: | |
607 | RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_UNKNOWN_PADDING_TYPE); | |
608 | goto err; | |
609 | } | |
610 | if (r < 0) | |
611 | RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_PADDING_CHECK_FAILED); | |
612 | ||
613 | err: | |
46ef873f GT |
614 | if (ctx != NULL) |
615 | { | |
616 | BN_CTX_end(ctx); | |
617 | BN_CTX_free(ctx); | |
618 | } | |
58964a49 RE |
619 | if (buf != NULL) |
620 | { | |
4579924b | 621 | OPENSSL_cleanse(buf,num); |
26a3a48d | 622 | OPENSSL_free(buf); |
58964a49 RE |
623 | } |
624 | return(r); | |
625 | } | |
626 | ||
46ef873f | 627 | static int RSA_eay_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx) |
58964a49 | 628 | { |
46ef873f | 629 | BIGNUM *r1,*m1,*vrfy; |
46a64376 BM |
630 | BIGNUM local_dmp1, local_dmq1; |
631 | BIGNUM *dmp1, *dmq1; | |
58964a49 | 632 | int ret=0; |
58964a49 | 633 | |
46ef873f GT |
634 | BN_CTX_start(ctx); |
635 | r1 = BN_CTX_get(ctx); | |
636 | m1 = BN_CTX_get(ctx); | |
637 | vrfy = BN_CTX_get(ctx); | |
58964a49 | 638 | |
79221bc2 GT |
639 | MONT_HELPER(rsa, ctx, p, rsa->flags & RSA_FLAG_CACHE_PRIVATE, goto err); |
640 | MONT_HELPER(rsa, ctx, q, rsa->flags & RSA_FLAG_CACHE_PRIVATE, goto err); | |
b12753df | 641 | MONT_HELPER(rsa, ctx, n, rsa->flags & RSA_FLAG_CACHE_PUBLIC, goto err); |
126fe085 | 642 | |
46ef873f | 643 | if (!BN_mod(r1,I,rsa->q,ctx)) goto err; |
46a64376 BM |
644 | if (!(rsa->flags & RSA_FLAG_NO_EXP_CONSTTIME)) |
645 | { | |
646 | dmq1 = &local_dmq1; | |
647 | BN_with_flags(dmq1, rsa->dmq1, BN_FLG_EXP_CONSTTIME); | |
648 | } | |
649 | else | |
650 | dmq1 = rsa->dmq1; | |
651 | if (!rsa->meth->bn_mod_exp(m1,r1,dmq1,rsa->q,ctx, | |
03f8b042 | 652 | rsa->_method_mod_q)) goto err; |
58964a49 | 653 | |
46ef873f | 654 | if (!BN_mod(r1,I,rsa->p,ctx)) goto err; |
46a64376 BM |
655 | if (!(rsa->flags & RSA_FLAG_NO_EXP_CONSTTIME)) |
656 | { | |
657 | dmp1 = &local_dmp1; | |
658 | BN_with_flags(dmp1, rsa->dmp1, BN_FLG_EXP_CONSTTIME); | |
659 | } | |
660 | else | |
661 | dmp1 = rsa->dmp1; | |
662 | if (!rsa->meth->bn_mod_exp(r0,r1,dmp1,rsa->p,ctx, | |
03f8b042 | 663 | rsa->_method_mod_p)) goto err; |
58964a49 | 664 | |
46ef873f | 665 | if (!BN_sub(r0,r0,m1)) goto err; |
dfeab068 RE |
666 | /* This will help stop the size of r0 increasing, which does |
667 | * affect the multiply if it optimised for a power of 2 size */ | |
ff22e913 | 668 | if (BN_is_negative(r0)) |
dfeab068 | 669 | if (!BN_add(r0,r0,rsa->p)) goto err; |
58964a49 | 670 | |
46ef873f GT |
671 | if (!BN_mul(r1,r0,rsa->iqmp,ctx)) goto err; |
672 | if (!BN_mod(r0,r1,rsa->p,ctx)) goto err; | |
abd4c915 DSH |
673 | /* If p < q it is occasionally possible for the correction of |
674 | * adding 'p' if r0 is negative above to leave the result still | |
675 | * negative. This can break the private key operations: the following | |
676 | * second correction should *always* correct this rare occurrence. | |
677 | * This will *never* happen with OpenSSL generated keys because | |
678 | * they ensure p > q [steve] | |
679 | */ | |
ff22e913 | 680 | if (BN_is_negative(r0)) |
abd4c915 | 681 | if (!BN_add(r0,r0,rsa->p)) goto err; |
46ef873f GT |
682 | if (!BN_mul(r1,r0,rsa->q,ctx)) goto err; |
683 | if (!BN_add(r0,r1,m1)) goto err; | |
58964a49 | 684 | |
6a5b52ef UM |
685 | if (rsa->e && rsa->n) |
686 | { | |
46ef873f | 687 | if (!rsa->meth->bn_mod_exp(vrfy,r0,rsa->e,rsa->n,ctx,rsa->_method_mod_n)) goto err; |
81d1998e GT |
688 | /* If 'I' was greater than (or equal to) rsa->n, the operation |
689 | * will be equivalent to using 'I mod n'. However, the result of | |
690 | * the verify will *always* be less than 'n' so we don't check | |
691 | * for absolute equality, just congruency. */ | |
46ef873f GT |
692 | if (!BN_sub(vrfy, vrfy, I)) goto err; |
693 | if (!BN_mod(vrfy, vrfy, rsa->n, ctx)) goto err; | |
ff22e913 | 694 | if (BN_is_negative(vrfy)) |
46ef873f GT |
695 | if (!BN_add(vrfy, vrfy, rsa->n)) goto err; |
696 | if (!BN_is_zero(vrfy)) | |
46a64376 | 697 | { |
81d1998e GT |
698 | /* 'I' and 'vrfy' aren't congruent mod n. Don't leak |
699 | * miscalculated CRT output, just do a raw (slower) | |
700 | * mod_exp and return that instead. */ | |
46a64376 BM |
701 | |
702 | BIGNUM local_d; | |
703 | BIGNUM *d = NULL; | |
704 | ||
705 | if (!(rsa->flags & RSA_FLAG_NO_EXP_CONSTTIME)) | |
706 | { | |
707 | d = &local_d; | |
708 | BN_with_flags(d, rsa->d, BN_FLG_EXP_CONSTTIME); | |
709 | } | |
710 | else | |
711 | d = rsa->d; | |
712 | if (!rsa->meth->bn_mod_exp(r0,I,d,rsa->n,ctx, | |
713 | rsa->_method_mod_n)) goto err; | |
714 | } | |
6a5b52ef | 715 | } |
58964a49 RE |
716 | ret=1; |
717 | err: | |
46ef873f | 718 | BN_CTX_end(ctx); |
58964a49 RE |
719 | return(ret); |
720 | } | |
721 | ||
6b691a5c | 722 | static int RSA_eay_init(RSA *rsa) |
58964a49 RE |
723 | { |
724 | rsa->flags|=RSA_FLAG_CACHE_PUBLIC|RSA_FLAG_CACHE_PRIVATE; | |
725 | return(1); | |
726 | } | |
727 | ||
6b691a5c | 728 | static int RSA_eay_finish(RSA *rsa) |
58964a49 | 729 | { |
03f8b042 BL |
730 | if (rsa->_method_mod_n != NULL) |
731 | BN_MONT_CTX_free(rsa->_method_mod_n); | |
732 | if (rsa->_method_mod_p != NULL) | |
733 | BN_MONT_CTX_free(rsa->_method_mod_p); | |
734 | if (rsa->_method_mod_q != NULL) | |
735 | BN_MONT_CTX_free(rsa->_method_mod_q); | |
58964a49 RE |
736 | return(1); |
737 | } | |
738 | ||
c1cd88a0 | 739 | #endif |