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diff --git a/src/lib/libcrypto/rsa/rsa_eay.c b/src/lib/libcrypto/rsa/rsa_eay.c
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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 */
58
59#include <stdio.h>
60#include "cryptlib.h"
61#include <openssl/bn.h>
62#include <openssl/rsa.h>
63#include <openssl/rand.h>
64#include <openssl/engine.h>
65
66#ifndef RSA_NULL
67
68static int RSA_eay_public_encrypt(int flen, unsigned char *from,
69 unsigned char *to, RSA *rsa,int padding);
70static int RSA_eay_private_encrypt(int flen, unsigned char *from,
71 unsigned char *to, RSA *rsa,int padding);
72static int RSA_eay_public_decrypt(int flen, unsigned char *from,
73 unsigned char *to, RSA *rsa,int padding);
74static int RSA_eay_private_decrypt(int flen, unsigned char *from,
75 unsigned char *to, RSA *rsa,int padding);
76static int RSA_eay_mod_exp(BIGNUM *r0, BIGNUM *i, RSA *rsa);
77static int RSA_eay_init(RSA *rsa);
78static int RSA_eay_finish(RSA *rsa);
79static RSA_METHOD rsa_pkcs1_eay_meth={
80 "Eric Young's PKCS#1 RSA",
81 RSA_eay_public_encrypt,
82 RSA_eay_public_decrypt,
83 RSA_eay_private_encrypt,
84 RSA_eay_private_decrypt,
85 RSA_eay_mod_exp,
86 BN_mod_exp_mont,
87 RSA_eay_init,
88 RSA_eay_finish,
89 0,
90 NULL,
91 };
92
93RSA_METHOD *RSA_PKCS1_SSLeay(void)
94 {
95 return(&rsa_pkcs1_eay_meth);
96 }
97
98static int RSA_eay_public_encrypt(int flen, unsigned char *from,
99 unsigned char *to, RSA *rsa, int padding)
100 {
101 const RSA_METHOD *meth;
102 BIGNUM f,ret;
103 int i,j,k,num=0,r= -1;
104 unsigned char *buf=NULL;
105 BN_CTX *ctx=NULL;
106
107 meth = ENGINE_get_RSA(rsa->engine);
108 BN_init(&f);
109 BN_init(&ret);
110 if ((ctx=BN_CTX_new()) == NULL) goto err;
111 num=BN_num_bytes(rsa->n);
112 if ((buf=(unsigned char *)OPENSSL_malloc(num)) == NULL)
113 {
114 RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT,ERR_R_MALLOC_FAILURE);
115 goto err;
116 }
117
118 switch (padding)
119 {
120 case RSA_PKCS1_PADDING:
121 i=RSA_padding_add_PKCS1_type_2(buf,num,from,flen);
122 break;
123#ifndef NO_SHA
124 case RSA_PKCS1_OAEP_PADDING:
125 i=RSA_padding_add_PKCS1_OAEP(buf,num,from,flen,NULL,0);
126 break;
127#endif
128 case RSA_SSLV23_PADDING:
129 i=RSA_padding_add_SSLv23(buf,num,from,flen);
130 break;
131 case RSA_NO_PADDING:
132 i=RSA_padding_add_none(buf,num,from,flen);
133 break;
134 default:
135 RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT,RSA_R_UNKNOWN_PADDING_TYPE);
136 goto err;
137 }
138 if (i <= 0) goto err;
139
140 if (BN_bin2bn(buf,num,&f) == NULL) goto err;
141
142 if ((rsa->_method_mod_n == NULL) && (rsa->flags & RSA_FLAG_CACHE_PUBLIC))
143 {
144 if ((rsa->_method_mod_n=BN_MONT_CTX_new()) != NULL)
145 if (!BN_MONT_CTX_set(rsa->_method_mod_n,rsa->n,ctx))
146 goto err;
147 }
148
149 if (!meth->bn_mod_exp(&ret,&f,rsa->e,rsa->n,ctx,
150 rsa->_method_mod_n)) goto err;
151
152 /* put in leading 0 bytes if the number is less than the
153 * length of the modulus */
154 j=BN_num_bytes(&ret);
155 i=BN_bn2bin(&ret,&(to[num-j]));
156 for (k=0; k<(num-i); k++)
157 to[k]=0;
158
159 r=num;
160err:
161 if (ctx != NULL) BN_CTX_free(ctx);
162 BN_clear_free(&f);
163 BN_clear_free(&ret);
164 if (buf != NULL)
165 {
166 memset(buf,0,num);
167 OPENSSL_free(buf);
168 }
169 return(r);
170 }
171
172static int RSA_eay_private_encrypt(int flen, unsigned char *from,
173 unsigned char *to, RSA *rsa, int padding)
174 {
175 const RSA_METHOD *meth;
176 BIGNUM f,ret;
177 int i,j,k,num=0,r= -1;
178 unsigned char *buf=NULL;
179 BN_CTX *ctx=NULL;
180
181 meth = ENGINE_get_RSA(rsa->engine);
182 BN_init(&f);
183 BN_init(&ret);
184
185 if ((ctx=BN_CTX_new()) == NULL) goto err;
186 num=BN_num_bytes(rsa->n);
187 if ((buf=(unsigned char *)OPENSSL_malloc(num)) == NULL)
188 {
189 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,ERR_R_MALLOC_FAILURE);
190 goto err;
191 }
192
193 switch (padding)
194 {
195 case RSA_PKCS1_PADDING:
196 i=RSA_padding_add_PKCS1_type_1(buf,num,from,flen);
197 break;
198 case RSA_NO_PADDING:
199 i=RSA_padding_add_none(buf,num,from,flen);
200 break;
201 case RSA_SSLV23_PADDING:
202 default:
203 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,RSA_R_UNKNOWN_PADDING_TYPE);
204 goto err;
205 }
206 if (i <= 0) goto err;
207
208 if (BN_bin2bn(buf,num,&f) == NULL) goto err;
209
210 if ((rsa->flags & RSA_FLAG_BLINDING) && (rsa->blinding == NULL))
211 RSA_blinding_on(rsa,ctx);
212 if (rsa->flags & RSA_FLAG_BLINDING)
213 if (!BN_BLINDING_convert(&f,rsa->blinding,ctx)) goto err;
214
215 if ( (rsa->flags & RSA_FLAG_EXT_PKEY) ||
216 ((rsa->p != NULL) &&
217 (rsa->q != NULL) &&
218 (rsa->dmp1 != NULL) &&
219 (rsa->dmq1 != NULL) &&
220 (rsa->iqmp != NULL)) )
221 { if (!meth->rsa_mod_exp(&ret,&f,rsa)) goto err; }
222 else
223 {
224 if (!meth->bn_mod_exp(&ret,&f,rsa->d,rsa->n,ctx,NULL)) goto err;
225 }
226
227 if (rsa->flags & RSA_FLAG_BLINDING)
228 if (!BN_BLINDING_invert(&ret,rsa->blinding,ctx)) goto err;
229
230 /* put in leading 0 bytes if the number is less than the
231 * length of the modulus */
232 j=BN_num_bytes(&ret);
233 i=BN_bn2bin(&ret,&(to[num-j]));
234 for (k=0; k<(num-i); k++)
235 to[k]=0;
236
237 r=num;
238err:
239 if (ctx != NULL) BN_CTX_free(ctx);
240 BN_clear_free(&ret);
241 BN_clear_free(&f);
242 if (buf != NULL)
243 {
244 memset(buf,0,num);
245 OPENSSL_free(buf);
246 }
247 return(r);
248 }
249
250static int RSA_eay_private_decrypt(int flen, unsigned char *from,
251 unsigned char *to, RSA *rsa, int padding)
252 {
253 const RSA_METHOD *meth;
254 BIGNUM f,ret;
255 int j,num=0,r= -1;
256 unsigned char *p;
257 unsigned char *buf=NULL;
258 BN_CTX *ctx=NULL;
259
260 meth = ENGINE_get_RSA(rsa->engine);
261 BN_init(&f);
262 BN_init(&ret);
263 ctx=BN_CTX_new();
264 if (ctx == NULL) goto err;
265
266 num=BN_num_bytes(rsa->n);
267
268 if ((buf=(unsigned char *)OPENSSL_malloc(num)) == NULL)
269 {
270 RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,ERR_R_MALLOC_FAILURE);
271 goto err;
272 }
273
274 /* This check was for equality but PGP does evil things
275 * and chops off the top '0' bytes */
276 if (flen > num)
277 {
278 RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_DATA_GREATER_THAN_MOD_LEN);
279 goto err;
280 }
281
282 /* make data into a big number */
283 if (BN_bin2bn(from,(int)flen,&f) == NULL) goto err;
284
285 if ((rsa->flags & RSA_FLAG_BLINDING) && (rsa->blinding == NULL))
286 RSA_blinding_on(rsa,ctx);
287 if (rsa->flags & RSA_FLAG_BLINDING)
288 if (!BN_BLINDING_convert(&f,rsa->blinding,ctx)) goto err;
289
290 /* do the decrypt */
291 if ( (rsa->flags & RSA_FLAG_EXT_PKEY) ||
292 ((rsa->p != NULL) &&
293 (rsa->q != NULL) &&
294 (rsa->dmp1 != NULL) &&
295 (rsa->dmq1 != NULL) &&
296 (rsa->iqmp != NULL)) )
297 { if (!meth->rsa_mod_exp(&ret,&f,rsa)) goto err; }
298 else
299 {
300 if (!meth->bn_mod_exp(&ret,&f,rsa->d,rsa->n,ctx,NULL))
301 goto err;
302 }
303
304 if (rsa->flags & RSA_FLAG_BLINDING)
305 if (!BN_BLINDING_invert(&ret,rsa->blinding,ctx)) goto err;
306
307 p=buf;
308 j=BN_bn2bin(&ret,p); /* j is only used with no-padding mode */
309
310 switch (padding)
311 {
312 case RSA_PKCS1_PADDING:
313 r=RSA_padding_check_PKCS1_type_2(to,num,buf,j,num);
314 break;
315#ifndef NO_SHA
316 case RSA_PKCS1_OAEP_PADDING:
317 r=RSA_padding_check_PKCS1_OAEP(to,num,buf,j,num,NULL,0);
318 break;
319#endif
320 case RSA_SSLV23_PADDING:
321 r=RSA_padding_check_SSLv23(to,num,buf,j,num);
322 break;
323 case RSA_NO_PADDING:
324 r=RSA_padding_check_none(to,num,buf,j,num);
325 break;
326 default:
327 RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_UNKNOWN_PADDING_TYPE);
328 goto err;
329 }
330 if (r < 0)
331 RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_PADDING_CHECK_FAILED);
332
333err:
334 if (ctx != NULL) BN_CTX_free(ctx);
335 BN_clear_free(&f);
336 BN_clear_free(&ret);
337 if (buf != NULL)
338 {
339 memset(buf,0,num);
340 OPENSSL_free(buf);
341 }
342 return(r);
343 }
344
345static int RSA_eay_public_decrypt(int flen, unsigned char *from,
346 unsigned char *to, RSA *rsa, int padding)
347 {
348 const RSA_METHOD *meth;
349 BIGNUM f,ret;
350 int i,num=0,r= -1;
351 unsigned char *p;
352 unsigned char *buf=NULL;
353 BN_CTX *ctx=NULL;
354
355 meth = ENGINE_get_RSA(rsa->engine);
356 BN_init(&f);
357 BN_init(&ret);
358 ctx=BN_CTX_new();
359 if (ctx == NULL) goto err;
360
361 num=BN_num_bytes(rsa->n);
362 buf=(unsigned char *)OPENSSL_malloc(num);
363 if (buf == NULL)
364 {
365 RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,ERR_R_MALLOC_FAILURE);
366 goto err;
367 }
368
369 /* This check was for equality but PGP does evil things
370 * and chops off the top '0' bytes */
371 if (flen > num)
372 {
373 RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_DATA_GREATER_THAN_MOD_LEN);
374 goto err;
375 }
376
377 if (BN_bin2bn(from,flen,&f) == NULL) goto err;
378 /* do the decrypt */
379 if ((rsa->_method_mod_n == NULL) && (rsa->flags & RSA_FLAG_CACHE_PUBLIC))
380 {
381 if ((rsa->_method_mod_n=BN_MONT_CTX_new()) != NULL)
382 if (!BN_MONT_CTX_set(rsa->_method_mod_n,rsa->n,ctx))
383 goto err;
384 }
385
386 if (!meth->bn_mod_exp(&ret,&f,rsa->e,rsa->n,ctx,
387 rsa->_method_mod_n)) goto err;
388
389 p=buf;
390 i=BN_bn2bin(&ret,p);
391
392 switch (padding)
393 {
394 case RSA_PKCS1_PADDING:
395 r=RSA_padding_check_PKCS1_type_1(to,num,buf,i,num);
396 break;
397 case RSA_NO_PADDING:
398 r=RSA_padding_check_none(to,num,buf,i,num);
399 break;
400 default:
401 RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_UNKNOWN_PADDING_TYPE);
402 goto err;
403 }
404 if (r < 0)
405 RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_PADDING_CHECK_FAILED);
406
407err:
408 if (ctx != NULL) BN_CTX_free(ctx);
409 BN_clear_free(&f);
410 BN_clear_free(&ret);
411 if (buf != NULL)
412 {
413 memset(buf,0,num);
414 OPENSSL_free(buf);
415 }
416 return(r);
417 }
418
419static int RSA_eay_mod_exp(BIGNUM *r0, BIGNUM *I, RSA *rsa)
420 {
421 const RSA_METHOD *meth;
422 BIGNUM r1,m1,vrfy;
423 int ret=0;
424 BN_CTX *ctx;
425
426 meth = ENGINE_get_RSA(rsa->engine);
427 if ((ctx=BN_CTX_new()) == NULL) goto err;
428 BN_init(&m1);
429 BN_init(&r1);
430 BN_init(&vrfy);
431
432 if (rsa->flags & RSA_FLAG_CACHE_PRIVATE)
433 {
434 if (rsa->_method_mod_p == NULL)
435 {
436 if ((rsa->_method_mod_p=BN_MONT_CTX_new()) != NULL)
437 if (!BN_MONT_CTX_set(rsa->_method_mod_p,rsa->p,
438 ctx))
439 goto err;
440 }
441 if (rsa->_method_mod_q == NULL)
442 {
443 if ((rsa->_method_mod_q=BN_MONT_CTX_new()) != NULL)
444 if (!BN_MONT_CTX_set(rsa->_method_mod_q,rsa->q,
445 ctx))
446 goto err;
447 }
448 }
449
450 if (!BN_mod(&r1,I,rsa->q,ctx)) goto err;
451 if (!meth->bn_mod_exp(&m1,&r1,rsa->dmq1,rsa->q,ctx,
452 rsa->_method_mod_q)) goto err;
453
454 if (!BN_mod(&r1,I,rsa->p,ctx)) goto err;
455 if (!meth->bn_mod_exp(r0,&r1,rsa->dmp1,rsa->p,ctx,
456 rsa->_method_mod_p)) goto err;
457
458 if (!BN_sub(r0,r0,&m1)) goto err;
459 /* This will help stop the size of r0 increasing, which does
460 * affect the multiply if it optimised for a power of 2 size */
461 if (r0->neg)
462 if (!BN_add(r0,r0,rsa->p)) goto err;
463
464 if (!BN_mul(&r1,r0,rsa->iqmp,ctx)) goto err;
465 if (!BN_mod(r0,&r1,rsa->p,ctx)) goto err;
466 /* If p < q it is occasionally possible for the correction of
467 * adding 'p' if r0 is negative above to leave the result still
468 * negative. This can break the private key operations: the following
469 * second correction should *always* correct this rare occurrence.
470 * This will *never* happen with OpenSSL generated keys because
471 * they ensure p > q [steve]
472 */
473 if (r0->neg)
474 if (!BN_add(r0,r0,rsa->p)) goto err;
475 if (!BN_mul(&r1,r0,rsa->q,ctx)) goto err;
476 if (!BN_add(r0,&r1,&m1)) goto err;
477
478 if (rsa->e && rsa->n)
479 {
480 if (!meth->bn_mod_exp(&vrfy,r0,rsa->e,rsa->n,ctx,NULL)) goto err;
481 if (BN_cmp(I, &vrfy) != 0)
482 {
483 if (!meth->bn_mod_exp(r0,I,rsa->d,rsa->n,ctx,NULL)) goto err;
484 }
485 }
486 ret=1;
487err:
488 BN_clear_free(&m1);
489 BN_clear_free(&r1);
490 BN_clear_free(&vrfy);
491 BN_CTX_free(ctx);
492 return(ret);
493 }
494
495static int RSA_eay_init(RSA *rsa)
496 {
497 rsa->flags|=RSA_FLAG_CACHE_PUBLIC|RSA_FLAG_CACHE_PRIVATE;
498 return(1);
499 }
500
501static int RSA_eay_finish(RSA *rsa)
502 {
503 if (rsa->_method_mod_n != NULL)
504 BN_MONT_CTX_free(rsa->_method_mod_n);
505 if (rsa->_method_mod_p != NULL)
506 BN_MONT_CTX_free(rsa->_method_mod_p);
507 if (rsa->_method_mod_q != NULL)
508 BN_MONT_CTX_free(rsa->_method_mod_q);
509 return(1);
510 }
511
512#endif
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-08-15 09:33:06 +0000