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1/* crypto/rsa/rsa_lib.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 <openssl/crypto.h>
61#include "cryptlib.h"
62#include <openssl/lhash.h>
63#include <openssl/bn.h>
64#include <openssl/rsa.h>
65#include <openssl/rand.h>
66#ifndef OPENSSL_NO_ENGINE
67#include <openssl/engine.h>
68#endif
69
70const char *RSA_version="RSA" OPENSSL_VERSION_PTEXT;
71
72static const RSA_METHOD *default_RSA_meth=NULL;
73
74RSA *RSA_new(void)
75 {
76 RSA *r=RSA_new_method(NULL);
77
78 return r;
79 }
80
81void RSA_set_default_method(const RSA_METHOD *meth)
82 {
83 default_RSA_meth = meth;
84 }
85
86const RSA_METHOD *RSA_get_default_method(void)
87 {
88 if (default_RSA_meth == NULL)
89 {
90#ifdef RSA_NULL
91 default_RSA_meth=RSA_null_method();
92#else
93#if 0 /* was: #ifdef RSAref */
94 default_RSA_meth=RSA_PKCS1_RSAref();
95#else
96 default_RSA_meth=RSA_PKCS1_SSLeay();
97#endif
98#endif
99 }
100
101 return default_RSA_meth;
102 }
103
104const RSA_METHOD *RSA_get_method(const RSA *rsa)
105 {
106 return rsa->meth;
107 }
108
109int RSA_set_method(RSA *rsa, const RSA_METHOD *meth)
110 {
111 /* NB: The caller is specifically setting a method, so it's not up to us
112 * to deal with which ENGINE it comes from. */
113 const RSA_METHOD *mtmp;
114 mtmp = rsa->meth;
115 if (mtmp->finish) mtmp->finish(rsa);
116#ifndef OPENSSL_NO_ENGINE
117 if (rsa->engine)
118 {
119 ENGINE_finish(rsa->engine);
120 rsa->engine = NULL;
121 }
122#endif
123 rsa->meth = meth;
124 if (meth->init) meth->init(rsa);
125 return 1;
126 }
127
128RSA *RSA_new_method(ENGINE *engine)
129 {
130 RSA *ret;
131
132 ret=(RSA *)OPENSSL_malloc(sizeof(RSA));
133 if (ret == NULL)
134 {
135 RSAerr(RSA_F_RSA_NEW_METHOD,ERR_R_MALLOC_FAILURE);
136 return NULL;
137 }
138
139 ret->meth = RSA_get_default_method();
140#ifndef OPENSSL_NO_ENGINE
141 if (engine)
142 {
143 if (!ENGINE_init(engine))
144 {
145 RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB);
146 OPENSSL_free(ret);
147 return NULL;
148 }
149 ret->engine = engine;
150 }
151 else
152 ret->engine = ENGINE_get_default_RSA();
153 if(ret->engine)
154 {
155 ret->meth = ENGINE_get_RSA(ret->engine);
156 if(!ret->meth)
157 {
158 RSAerr(RSA_F_RSA_NEW_METHOD,
159 ERR_R_ENGINE_LIB);
160 ENGINE_finish(ret->engine);
161 OPENSSL_free(ret);
162 return NULL;
163 }
164 }
165#endif
166
167 ret->pad=0;
168 ret->version=0;
169 ret->n=NULL;
170 ret->e=NULL;
171 ret->d=NULL;
172 ret->p=NULL;
173 ret->q=NULL;
174 ret->dmp1=NULL;
175 ret->dmq1=NULL;
176 ret->iqmp=NULL;
177 ret->references=1;
178 ret->_method_mod_n=NULL;
179 ret->_method_mod_p=NULL;
180 ret->_method_mod_q=NULL;
181 ret->blinding=NULL;
182 ret->bignum_data=NULL;
183 ret->flags=ret->meth->flags;
184 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data);
185 if ((ret->meth->init != NULL) && !ret->meth->init(ret))
186 {
187#ifndef OPENSSL_NO_ENGINE
188 if (ret->engine)
189 ENGINE_finish(ret->engine);
190#endif
191 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data);
192 OPENSSL_free(ret);
193 ret=NULL;
194 }
195 return(ret);
196 }
197
198void RSA_free(RSA *r)
199 {
200 int i;
201
202 if (r == NULL) return;
203
204 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_RSA);
205#ifdef REF_PRINT
206 REF_PRINT("RSA",r);
207#endif
208 if (i > 0) return;
209#ifdef REF_CHECK
210 if (i < 0)
211 {
212 fprintf(stderr,"RSA_free, bad reference count\n");
213 abort();
214 }
215#endif
216
217 if (r->meth->finish)
218 r->meth->finish(r);
219#ifndef OPENSSL_NO_ENGINE
220 if (r->engine)
221 ENGINE_finish(r->engine);
222#endif
223
224 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, r, &r->ex_data);
225
226 if (r->n != NULL) BN_clear_free(r->n);
227 if (r->e != NULL) BN_clear_free(r->e);
228 if (r->d != NULL) BN_clear_free(r->d);
229 if (r->p != NULL) BN_clear_free(r->p);
230 if (r->q != NULL) BN_clear_free(r->q);
231 if (r->dmp1 != NULL) BN_clear_free(r->dmp1);
232 if (r->dmq1 != NULL) BN_clear_free(r->dmq1);
233 if (r->iqmp != NULL) BN_clear_free(r->iqmp);
234 if (r->blinding != NULL) BN_BLINDING_free(r->blinding);
235 if (r->bignum_data != NULL) OPENSSL_free_locked(r->bignum_data);
236 OPENSSL_free(r);
237 }
238
239int RSA_up_ref(RSA *r)
240 {
241 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_RSA);
242#ifdef REF_PRINT
243 REF_PRINT("RSA",r);
244#endif
245#ifdef REF_CHECK
246 if (i < 2)
247 {
248 fprintf(stderr, "RSA_up_ref, bad reference count\n");
249 abort();
250 }
251#endif
252 return ((i > 1) ? 1 : 0);
253 }
254
255int RSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
256 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
257 {
258 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_RSA, argl, argp,
259 new_func, dup_func, free_func);
260 }
261
262int RSA_set_ex_data(RSA *r, int idx, void *arg)
263 {
264 return(CRYPTO_set_ex_data(&r->ex_data,idx,arg));
265 }
266
267void *RSA_get_ex_data(const RSA *r, int idx)
268 {
269 return(CRYPTO_get_ex_data(&r->ex_data,idx));
270 }
271
272int RSA_size(const RSA *r)
273 {
274 return(BN_num_bytes(r->n));
275 }
276
277int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to,
278 RSA *rsa, int padding)
279 {
280 return(rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding));
281 }
282
283int RSA_private_encrypt(int flen, const unsigned char *from, unsigned char *to,
284 RSA *rsa, int padding)
285 {
286 return(rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding));
287 }
288
289int RSA_private_decrypt(int flen, const unsigned char *from, unsigned char *to,
290 RSA *rsa, int padding)
291 {
292 return(rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding));
293 }
294
295int RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to,
296 RSA *rsa, int padding)
297 {
298 return(rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding));
299 }
300
301int RSA_flags(const RSA *r)
302 {
303 return((r == NULL)?0:r->meth->flags);
304 }
305
306void RSA_blinding_off(RSA *rsa)
307 {
308 if (rsa->blinding != NULL)
309 {
310 BN_BLINDING_free(rsa->blinding);
311 rsa->blinding=NULL;
312 }
313 rsa->flags &= ~RSA_FLAG_BLINDING;
314 rsa->flags |= RSA_FLAG_NO_BLINDING;
315 }
316
317int RSA_blinding_on(RSA *rsa, BN_CTX *p_ctx)
318 {
319 BIGNUM *A,*Ai = NULL;
320 BN_CTX *ctx;
321 int ret=0;
322
323 if (p_ctx == NULL)
324 {
325 if ((ctx=BN_CTX_new()) == NULL) goto err;
326 }
327 else
328 ctx=p_ctx;
329
330 /* XXXXX: Shouldn't this be RSA_blinding_off(rsa)? */
331 if (rsa->blinding != NULL)
332 {
333 BN_BLINDING_free(rsa->blinding);
334 rsa->blinding = NULL;
335 }
336
337 /* NB: similar code appears in setup_blinding (rsa_eay.c);
338 * this should be placed in a new function of its own, but for reasons
339 * of binary compatibility can't */
340
341 BN_CTX_start(ctx);
342 A = BN_CTX_get(ctx);
343 if ((RAND_status() == 0) && rsa->d != NULL && rsa->d->d != NULL)
344 {
345 /* if PRNG is not properly seeded, resort to secret exponent as unpredictable seed */
346 RAND_add(rsa->d->d, rsa->d->dmax * sizeof rsa->d->d[0], 0);
347 if (!BN_pseudo_rand_range(A,rsa->n)) goto err;
348 }
349 else
350 {
351 if (!BN_rand_range(A,rsa->n)) goto err;
352 }
353 if ((Ai=BN_mod_inverse(NULL,A,rsa->n,ctx)) == NULL) goto err;
354
355 if (!rsa->meth->bn_mod_exp(A,A,rsa->e,rsa->n,ctx,rsa->_method_mod_n))
356 goto err;
357 if ((rsa->blinding=BN_BLINDING_new(A,Ai,rsa->n)) == NULL) goto err;
358 /* to make things thread-safe without excessive locking,
359 * rsa->blinding will be used just by the current thread: */
360 rsa->blinding->thread_id = CRYPTO_thread_id();
361 rsa->flags |= RSA_FLAG_BLINDING;
362 rsa->flags &= ~RSA_FLAG_NO_BLINDING;
363 ret=1;
364err:
365 if (Ai != NULL) BN_free(Ai);
366 BN_CTX_end(ctx);
367 if (ctx != p_ctx) BN_CTX_free(ctx);
368 return(ret);
369 }
370
371int RSA_memory_lock(RSA *r)
372 {
373 int i,j,k,off;
374 char *p;
375 BIGNUM *bn,**t[6],*b;
376 BN_ULONG *ul;
377
378 if (r->d == NULL) return(1);
379 t[0]= &r->d;
380 t[1]= &r->p;
381 t[2]= &r->q;
382 t[3]= &r->dmp1;
383 t[4]= &r->dmq1;
384 t[5]= &r->iqmp;
385 k=sizeof(BIGNUM)*6;
386 off=k/sizeof(BN_ULONG)+1;
387 j=1;
388 for (i=0; i<6; i++)
389 j+= (*t[i])->top;
390 if ((p=OPENSSL_malloc_locked((off+j)*sizeof(BN_ULONG))) == NULL)
391 {
392 RSAerr(RSA_F_MEMORY_LOCK,ERR_R_MALLOC_FAILURE);
393 return(0);
394 }
395 bn=(BIGNUM *)p;
396 ul=(BN_ULONG *)&(p[off]);
397 for (i=0; i<6; i++)
398 {
399 b= *(t[i]);
400 *(t[i])= &(bn[i]);
401 memcpy((char *)&(bn[i]),(char *)b,sizeof(BIGNUM));
402 bn[i].flags=BN_FLG_STATIC_DATA;
403 bn[i].d=ul;
404 memcpy((char *)ul,b->d,sizeof(BN_ULONG)*b->top);
405 ul+=b->top;
406 BN_clear_free(b);
407 }
408
409 /* I should fix this so it can still be done */
410 r->flags&= ~(RSA_FLAG_CACHE_PRIVATE|RSA_FLAG_CACHE_PUBLIC);
411
412 r->bignum_data=p;
413 return(1);
414 }
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