]>
Commit | Line | Data |
---|---|---|
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 | 285 | int ret; |
ce75ca04 | 286 | CRYPTO_r_lock(CRYPTO_LOCK_RSA_BLINDING); |
800e400d | 287 | ret = BN_BLINDING_convert_ex(f, r, b, ctx); |
ce75ca04 | 288 | CRYPTO_r_unlock(CRYPTO_LOCK_RSA_BLINDING); |
800e400d | 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 | 300 | int ret; |
ce75ca04 | 301 | CRYPTO_w_lock(CRYPTO_LOCK_RSA_BLINDING); |
800e400d | 302 | ret = BN_BLINDING_invert_ex(f, r, b, ctx); |
ce75ca04 | 303 | CRYPTO_w_unlock(CRYPTO_LOCK_RSA_BLINDING); |
800e400d | 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 | { |
499fca2d | 312 | BIGNUM *f, *ret, *br, *res; |
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; | |
499fca2d DSH |
337 | case RSA_X931_PADDING: |
338 | i=RSA_padding_add_X931(buf,num,from,flen); | |
339 | break; | |
58964a49 RE |
340 | case RSA_NO_PADDING: |
341 | i=RSA_padding_add_none(buf,num,from,flen); | |
342 | break; | |
343 | case RSA_SSLV23_PADDING: | |
344 | default: | |
345 | RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,RSA_R_UNKNOWN_PADDING_TYPE); | |
346 | goto err; | |
347 | } | |
348 | if (i <= 0) goto err; | |
349 | ||
46ef873f | 350 | if (BN_bin2bn(buf,num,f) == NULL) goto err; |
24cff6ce | 351 | |
46ef873f | 352 | if (BN_ucmp(f, rsa->n) >= 0) |
24cff6ce BM |
353 | { |
354 | /* usually the padding functions would catch this */ | |
355 | RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,RSA_R_DATA_TOO_LARGE_FOR_MODULUS); | |
356 | goto err; | |
357 | } | |
58964a49 | 358 | |
c554155b | 359 | if (!(rsa->flags & RSA_FLAG_NO_BLINDING)) |
5679bcce | 360 | { |
800e400d | 361 | blinding = rsa_get_blinding(rsa, &br, &local_blinding, ctx); |
5679bcce BM |
362 | if (blinding == NULL) |
363 | { | |
364 | RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, ERR_R_INTERNAL_ERROR); | |
365 | goto err; | |
366 | } | |
367 | } | |
368 | ||
369 | if (blinding != NULL) | |
800e400d NL |
370 | if (!rsa_blinding_convert(blinding, local_blinding, f, br, ctx)) |
371 | goto err; | |
58964a49 | 372 | |
770d19b8 DSH |
373 | if ( (rsa->flags & RSA_FLAG_EXT_PKEY) || |
374 | ((rsa->p != NULL) && | |
58964a49 RE |
375 | (rsa->q != NULL) && |
376 | (rsa->dmp1 != NULL) && | |
377 | (rsa->dmq1 != NULL) && | |
770d19b8 | 378 | (rsa->iqmp != NULL)) ) |
46a64376 BM |
379 | { |
380 | if (!rsa->meth->rsa_mod_exp(ret, f, rsa, ctx)) goto err; | |
381 | } | |
58964a49 RE |
382 | else |
383 | { | |
46a64376 BM |
384 | BIGNUM local_d; |
385 | BIGNUM *d = NULL; | |
386 | ||
387 | if (!(rsa->flags & RSA_FLAG_NO_EXP_CONSTTIME)) | |
388 | { | |
a28a5d9c | 389 | BN_init(&local_d); |
46a64376 BM |
390 | d = &local_d; |
391 | BN_with_flags(d, rsa->d, BN_FLG_EXP_CONSTTIME); | |
392 | } | |
393 | else | |
394 | d = rsa->d; | |
395 | ||
b12753df | 396 | MONT_HELPER(rsa, ctx, n, rsa->flags & RSA_FLAG_CACHE_PUBLIC, goto err); |
46a64376 BM |
397 | |
398 | if (!rsa->meth->bn_mod_exp(ret,f,d,rsa->n,ctx, | |
b12753df | 399 | rsa->_method_mod_n)) goto err; |
58964a49 RE |
400 | } |
401 | ||
5679bcce | 402 | if (blinding) |
800e400d NL |
403 | if (!rsa_blinding_invert(blinding, local_blinding, ret, br, ctx)) |
404 | goto err; | |
58964a49 | 405 | |
499fca2d DSH |
406 | if (padding == RSA_X931_PADDING) |
407 | { | |
408 | BN_sub(f, rsa->n, ret); | |
409 | if (BN_cmp(ret, f)) | |
410 | res = f; | |
411 | else | |
412 | res = ret; | |
413 | } | |
414 | else | |
415 | res = ret; | |
416 | ||
58964a49 RE |
417 | /* put in leading 0 bytes if the number is less than the |
418 | * length of the modulus */ | |
499fca2d DSH |
419 | j=BN_num_bytes(res); |
420 | i=BN_bn2bin(res,&(to[num-j])); | |
58964a49 RE |
421 | for (k=0; k<(num-i); k++) |
422 | to[k]=0; | |
423 | ||
424 | r=num; | |
425 | err: | |
46ef873f GT |
426 | if (ctx != NULL) |
427 | { | |
428 | BN_CTX_end(ctx); | |
429 | BN_CTX_free(ctx); | |
430 | } | |
58964a49 RE |
431 | if (buf != NULL) |
432 | { | |
4579924b | 433 | OPENSSL_cleanse(buf,num); |
26a3a48d | 434 | OPENSSL_free(buf); |
58964a49 RE |
435 | } |
436 | return(r); | |
437 | } | |
438 | ||
29c1f061 | 439 | static int RSA_eay_private_decrypt(int flen, const unsigned char *from, |
6b691a5c | 440 | unsigned char *to, RSA *rsa, int padding) |
58964a49 | 441 | { |
800e400d | 442 | BIGNUM *f, *ret, *br; |
58964a49 RE |
443 | int j,num=0,r= -1; |
444 | unsigned char *p; | |
445 | unsigned char *buf=NULL; | |
446 | BN_CTX *ctx=NULL; | |
5679bcce BM |
447 | int local_blinding = 0; |
448 | BN_BLINDING *blinding = NULL; | |
58964a49 | 449 | |
46ef873f GT |
450 | if((ctx = BN_CTX_new()) == NULL) goto err; |
451 | BN_CTX_start(ctx); | |
800e400d NL |
452 | f = BN_CTX_get(ctx); |
453 | br = BN_CTX_get(ctx); | |
46ef873f | 454 | ret = BN_CTX_get(ctx); |
800e400d | 455 | num = BN_num_bytes(rsa->n); |
46ef873f GT |
456 | buf = OPENSSL_malloc(num); |
457 | if(!f || !ret || !buf) | |
58964a49 RE |
458 | { |
459 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,ERR_R_MALLOC_FAILURE); | |
460 | goto err; | |
461 | } | |
462 | ||
657e60fa | 463 | /* This check was for equality but PGP does evil things |
58964a49 RE |
464 | * and chops off the top '0' bytes */ |
465 | if (flen > num) | |
466 | { | |
467 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_DATA_GREATER_THAN_MOD_LEN); | |
468 | goto err; | |
469 | } | |
470 | ||
471 | /* make data into a big number */ | |
46ef873f | 472 | if (BN_bin2bn(from,(int)flen,f) == NULL) goto err; |
58964a49 | 473 | |
46ef873f | 474 | if (BN_ucmp(f, rsa->n) >= 0) |
24cff6ce BM |
475 | { |
476 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_DATA_TOO_LARGE_FOR_MODULUS); | |
477 | goto err; | |
478 | } | |
479 | ||
c554155b | 480 | if (!(rsa->flags & RSA_FLAG_NO_BLINDING)) |
5679bcce | 481 | { |
800e400d | 482 | blinding = rsa_get_blinding(rsa, &br, &local_blinding, ctx); |
5679bcce BM |
483 | if (blinding == NULL) |
484 | { | |
8afca8d9 | 485 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT, ERR_R_INTERNAL_ERROR); |
5679bcce BM |
486 | goto err; |
487 | } | |
488 | } | |
489 | ||
490 | if (blinding != NULL) | |
800e400d NL |
491 | if (!rsa_blinding_convert(blinding, local_blinding, f, br, ctx)) |
492 | goto err; | |
58964a49 RE |
493 | |
494 | /* do the decrypt */ | |
770d19b8 DSH |
495 | if ( (rsa->flags & RSA_FLAG_EXT_PKEY) || |
496 | ((rsa->p != NULL) && | |
58964a49 RE |
497 | (rsa->q != NULL) && |
498 | (rsa->dmp1 != NULL) && | |
499 | (rsa->dmq1 != NULL) && | |
770d19b8 | 500 | (rsa->iqmp != NULL)) ) |
46a64376 BM |
501 | { |
502 | if (!rsa->meth->rsa_mod_exp(ret, f, rsa, ctx)) goto err; | |
503 | } | |
58964a49 RE |
504 | else |
505 | { | |
46a64376 BM |
506 | BIGNUM local_d; |
507 | BIGNUM *d = NULL; | |
508 | ||
509 | if (!(rsa->flags & RSA_FLAG_NO_EXP_CONSTTIME)) | |
510 | { | |
511 | d = &local_d; | |
512 | BN_with_flags(d, rsa->d, BN_FLG_EXP_CONSTTIME); | |
513 | } | |
514 | else | |
515 | d = rsa->d; | |
516 | ||
b12753df | 517 | MONT_HELPER(rsa, ctx, n, rsa->flags & RSA_FLAG_CACHE_PUBLIC, goto err); |
46a64376 | 518 | if (!rsa->meth->bn_mod_exp(ret,f,d,rsa->n,ctx, |
b12753df | 519 | rsa->_method_mod_n)) |
46a64376 | 520 | goto err; |
58964a49 RE |
521 | } |
522 | ||
5679bcce | 523 | if (blinding) |
800e400d NL |
524 | if (!rsa_blinding_invert(blinding, local_blinding, ret, br, ctx)) |
525 | goto err; | |
58964a49 RE |
526 | |
527 | p=buf; | |
46ef873f | 528 | j=BN_bn2bin(ret,p); /* j is only used with no-padding mode */ |
58964a49 RE |
529 | |
530 | switch (padding) | |
531 | { | |
532 | case RSA_PKCS1_PADDING: | |
dfeab068 | 533 | r=RSA_padding_check_PKCS1_type_2(to,num,buf,j,num); |
58964a49 | 534 | break; |
cf1b7d96 | 535 | #ifndef OPENSSL_NO_SHA |
a4949896 BL |
536 | case RSA_PKCS1_OAEP_PADDING: |
537 | r=RSA_padding_check_PKCS1_OAEP(to,num,buf,j,num,NULL,0); | |
538 | break; | |
79df9d62 | 539 | #endif |
a4949896 | 540 | case RSA_SSLV23_PADDING: |
dfeab068 | 541 | r=RSA_padding_check_SSLv23(to,num,buf,j,num); |
58964a49 RE |
542 | break; |
543 | case RSA_NO_PADDING: | |
dfeab068 | 544 | r=RSA_padding_check_none(to,num,buf,j,num); |
58964a49 RE |
545 | break; |
546 | default: | |
547 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_UNKNOWN_PADDING_TYPE); | |
548 | goto err; | |
549 | } | |
550 | if (r < 0) | |
551 | RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_PADDING_CHECK_FAILED); | |
552 | ||
553 | err: | |
46ef873f GT |
554 | if (ctx != NULL) |
555 | { | |
556 | BN_CTX_end(ctx); | |
557 | BN_CTX_free(ctx); | |
558 | } | |
58964a49 RE |
559 | if (buf != NULL) |
560 | { | |
4579924b | 561 | OPENSSL_cleanse(buf,num); |
26a3a48d | 562 | OPENSSL_free(buf); |
58964a49 RE |
563 | } |
564 | return(r); | |
565 | } | |
566 | ||
24cff6ce | 567 | /* signature verification */ |
29c1f061 | 568 | static int RSA_eay_public_decrypt(int flen, const unsigned char *from, |
6b691a5c | 569 | unsigned char *to, RSA *rsa, int padding) |
58964a49 | 570 | { |
46ef873f | 571 | BIGNUM *f,*ret; |
58964a49 RE |
572 | int i,num=0,r= -1; |
573 | unsigned char *p; | |
574 | unsigned char *buf=NULL; | |
575 | BN_CTX *ctx=NULL; | |
576 | ||
46ef873f GT |
577 | if((ctx = BN_CTX_new()) == NULL) goto err; |
578 | BN_CTX_start(ctx); | |
579 | f = BN_CTX_get(ctx); | |
580 | ret = BN_CTX_get(ctx); | |
58964a49 | 581 | num=BN_num_bytes(rsa->n); |
46ef873f GT |
582 | buf = OPENSSL_malloc(num); |
583 | if(!f || !ret || !buf) | |
58964a49 RE |
584 | { |
585 | RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,ERR_R_MALLOC_FAILURE); | |
586 | goto err; | |
587 | } | |
588 | ||
657e60fa | 589 | /* This check was for equality but PGP does evil things |
58964a49 RE |
590 | * and chops off the top '0' bytes */ |
591 | if (flen > num) | |
592 | { | |
593 | RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_DATA_GREATER_THAN_MOD_LEN); | |
594 | goto err; | |
595 | } | |
596 | ||
46ef873f | 597 | if (BN_bin2bn(from,flen,f) == NULL) goto err; |
24cff6ce | 598 | |
46ef873f | 599 | if (BN_ucmp(f, rsa->n) >= 0) |
24cff6ce BM |
600 | { |
601 | RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_DATA_TOO_LARGE_FOR_MODULUS); | |
602 | goto err; | |
603 | } | |
604 | ||
79221bc2 GT |
605 | MONT_HELPER(rsa, ctx, n, rsa->flags & RSA_FLAG_CACHE_PUBLIC, goto err); |
606 | ||
46ef873f | 607 | if (!rsa->meth->bn_mod_exp(ret,f,rsa->e,rsa->n,ctx, |
03f8b042 | 608 | rsa->_method_mod_n)) goto err; |
58964a49 | 609 | |
499fca2d DSH |
610 | if ((padding == RSA_X931_PADDING) && ((ret->d[0] & 0xf) != 12)) |
611 | BN_sub(ret, rsa->n, ret); | |
612 | ||
58964a49 | 613 | p=buf; |
46ef873f | 614 | i=BN_bn2bin(ret,p); |
58964a49 RE |
615 | |
616 | switch (padding) | |
617 | { | |
618 | case RSA_PKCS1_PADDING: | |
dfeab068 | 619 | r=RSA_padding_check_PKCS1_type_1(to,num,buf,i,num); |
58964a49 | 620 | break; |
499fca2d DSH |
621 | case RSA_X931_PADDING: |
622 | r=RSA_padding_check_X931(to,num,buf,i,num); | |
623 | break; | |
58964a49 | 624 | case RSA_NO_PADDING: |
dfeab068 | 625 | r=RSA_padding_check_none(to,num,buf,i,num); |
58964a49 RE |
626 | break; |
627 | default: | |
628 | RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_UNKNOWN_PADDING_TYPE); | |
629 | goto err; | |
630 | } | |
631 | if (r < 0) | |
632 | RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_PADDING_CHECK_FAILED); | |
633 | ||
634 | err: | |
46ef873f GT |
635 | if (ctx != NULL) |
636 | { | |
637 | BN_CTX_end(ctx); | |
638 | BN_CTX_free(ctx); | |
639 | } | |
58964a49 RE |
640 | if (buf != NULL) |
641 | { | |
4579924b | 642 | OPENSSL_cleanse(buf,num); |
26a3a48d | 643 | OPENSSL_free(buf); |
58964a49 RE |
644 | } |
645 | return(r); | |
646 | } | |
647 | ||
46ef873f | 648 | static int RSA_eay_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx) |
58964a49 | 649 | { |
46ef873f | 650 | BIGNUM *r1,*m1,*vrfy; |
46a64376 BM |
651 | BIGNUM local_dmp1, local_dmq1; |
652 | BIGNUM *dmp1, *dmq1; | |
58964a49 | 653 | int ret=0; |
58964a49 | 654 | |
46ef873f GT |
655 | BN_CTX_start(ctx); |
656 | r1 = BN_CTX_get(ctx); | |
657 | m1 = BN_CTX_get(ctx); | |
658 | vrfy = BN_CTX_get(ctx); | |
58964a49 | 659 | |
79221bc2 GT |
660 | MONT_HELPER(rsa, ctx, p, rsa->flags & RSA_FLAG_CACHE_PRIVATE, goto err); |
661 | MONT_HELPER(rsa, ctx, q, rsa->flags & RSA_FLAG_CACHE_PRIVATE, goto err); | |
b12753df | 662 | MONT_HELPER(rsa, ctx, n, rsa->flags & RSA_FLAG_CACHE_PUBLIC, goto err); |
126fe085 | 663 | |
46ef873f | 664 | if (!BN_mod(r1,I,rsa->q,ctx)) goto err; |
46a64376 BM |
665 | if (!(rsa->flags & RSA_FLAG_NO_EXP_CONSTTIME)) |
666 | { | |
667 | dmq1 = &local_dmq1; | |
668 | BN_with_flags(dmq1, rsa->dmq1, BN_FLG_EXP_CONSTTIME); | |
669 | } | |
670 | else | |
671 | dmq1 = rsa->dmq1; | |
672 | if (!rsa->meth->bn_mod_exp(m1,r1,dmq1,rsa->q,ctx, | |
03f8b042 | 673 | rsa->_method_mod_q)) goto err; |
58964a49 | 674 | |
46ef873f | 675 | if (!BN_mod(r1,I,rsa->p,ctx)) goto err; |
46a64376 BM |
676 | if (!(rsa->flags & RSA_FLAG_NO_EXP_CONSTTIME)) |
677 | { | |
678 | dmp1 = &local_dmp1; | |
679 | BN_with_flags(dmp1, rsa->dmp1, BN_FLG_EXP_CONSTTIME); | |
680 | } | |
681 | else | |
682 | dmp1 = rsa->dmp1; | |
683 | if (!rsa->meth->bn_mod_exp(r0,r1,dmp1,rsa->p,ctx, | |
03f8b042 | 684 | rsa->_method_mod_p)) goto err; |
58964a49 | 685 | |
46ef873f | 686 | if (!BN_sub(r0,r0,m1)) goto err; |
dfeab068 RE |
687 | /* This will help stop the size of r0 increasing, which does |
688 | * affect the multiply if it optimised for a power of 2 size */ | |
ff22e913 | 689 | if (BN_is_negative(r0)) |
dfeab068 | 690 | if (!BN_add(r0,r0,rsa->p)) goto err; |
58964a49 | 691 | |
46ef873f GT |
692 | if (!BN_mul(r1,r0,rsa->iqmp,ctx)) goto err; |
693 | if (!BN_mod(r0,r1,rsa->p,ctx)) goto err; | |
abd4c915 DSH |
694 | /* If p < q it is occasionally possible for the correction of |
695 | * adding 'p' if r0 is negative above to leave the result still | |
696 | * negative. This can break the private key operations: the following | |
697 | * second correction should *always* correct this rare occurrence. | |
698 | * This will *never* happen with OpenSSL generated keys because | |
699 | * they ensure p > q [steve] | |
700 | */ | |
ff22e913 | 701 | if (BN_is_negative(r0)) |
abd4c915 | 702 | if (!BN_add(r0,r0,rsa->p)) goto err; |
46ef873f GT |
703 | if (!BN_mul(r1,r0,rsa->q,ctx)) goto err; |
704 | if (!BN_add(r0,r1,m1)) goto err; | |
58964a49 | 705 | |
6a5b52ef UM |
706 | if (rsa->e && rsa->n) |
707 | { | |
46ef873f | 708 | if (!rsa->meth->bn_mod_exp(vrfy,r0,rsa->e,rsa->n,ctx,rsa->_method_mod_n)) goto err; |
81d1998e GT |
709 | /* If 'I' was greater than (or equal to) rsa->n, the operation |
710 | * will be equivalent to using 'I mod n'. However, the result of | |
711 | * the verify will *always* be less than 'n' so we don't check | |
712 | * for absolute equality, just congruency. */ | |
46ef873f GT |
713 | if (!BN_sub(vrfy, vrfy, I)) goto err; |
714 | if (!BN_mod(vrfy, vrfy, rsa->n, ctx)) goto err; | |
ff22e913 | 715 | if (BN_is_negative(vrfy)) |
46ef873f GT |
716 | if (!BN_add(vrfy, vrfy, rsa->n)) goto err; |
717 | if (!BN_is_zero(vrfy)) | |
46a64376 | 718 | { |
81d1998e GT |
719 | /* 'I' and 'vrfy' aren't congruent mod n. Don't leak |
720 | * miscalculated CRT output, just do a raw (slower) | |
721 | * mod_exp and return that instead. */ | |
46a64376 BM |
722 | |
723 | BIGNUM local_d; | |
724 | BIGNUM *d = NULL; | |
725 | ||
726 | if (!(rsa->flags & RSA_FLAG_NO_EXP_CONSTTIME)) | |
727 | { | |
728 | d = &local_d; | |
729 | BN_with_flags(d, rsa->d, BN_FLG_EXP_CONSTTIME); | |
730 | } | |
731 | else | |
732 | d = rsa->d; | |
733 | if (!rsa->meth->bn_mod_exp(r0,I,d,rsa->n,ctx, | |
734 | rsa->_method_mod_n)) goto err; | |
735 | } | |
6a5b52ef | 736 | } |
58964a49 RE |
737 | ret=1; |
738 | err: | |
46ef873f | 739 | BN_CTX_end(ctx); |
58964a49 RE |
740 | return(ret); |
741 | } | |
742 | ||
6b691a5c | 743 | static int RSA_eay_init(RSA *rsa) |
58964a49 RE |
744 | { |
745 | rsa->flags|=RSA_FLAG_CACHE_PUBLIC|RSA_FLAG_CACHE_PRIVATE; | |
746 | return(1); | |
747 | } | |
748 | ||
6b691a5c | 749 | static int RSA_eay_finish(RSA *rsa) |
58964a49 | 750 | { |
03f8b042 BL |
751 | if (rsa->_method_mod_n != NULL) |
752 | BN_MONT_CTX_free(rsa->_method_mod_n); | |
753 | if (rsa->_method_mod_p != NULL) | |
754 | BN_MONT_CTX_free(rsa->_method_mod_p); | |
755 | if (rsa->_method_mod_q != NULL) | |
756 | BN_MONT_CTX_free(rsa->_method_mod_q); | |
58964a49 RE |
757 | return(1); |
758 | } | |
759 | ||
c1cd88a0 | 760 | #endif |