xref: /freebsd-src/crypto/openssl/crypto/rsa/rsa_lib.c (revision cd844e7a7df72952bb1135fea0a4c6ee372a7027) 
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 /* $FreeBSD$ */
59 
60 #include <stdio.h>
61 #include <openssl/crypto.h>
62 #include "cryptlib.h"
63 #include <openssl/lhash.h>
64 #include <openssl/bn.h>
65 #include <openssl/rsa.h>
66 #include <openssl/rand.h>
67 #ifndef OPENSSL_NO_ENGINE
68 #include <openssl/engine.h>
69 #endif
70 
71 const char RSA_version[]="RSA" OPENSSL_VERSION_PTEXT;
72 
73 static const RSA_METHOD *default_RSA_meth=NULL;
74 
75 RSA *RSA_new(void)
76 	{
77 	RSA *r=RSA_new_method(NULL);
78 
79 #ifndef OPENSSL_NO_FORCE_RSA_BLINDING
80 	r->flags|=RSA_FLAG_BLINDING;
81 #endif
82 	return r;
83 	}
84 
85 void RSA_set_default_method(const RSA_METHOD *meth)
86 	{
87 	default_RSA_meth = meth;
88 	}
89 
90 const RSA_METHOD *RSA_get_default_method(void)
91 	{
92 	if (default_RSA_meth == NULL)
93 		{
94 #ifdef RSA_NULL
95 		default_RSA_meth=RSA_null_method();
96 #else
97 #if 0 /* was: #ifdef RSAref */
98 		default_RSA_meth=RSA_PKCS1_RSAref();
99 #else
100 		default_RSA_meth=RSA_PKCS1_SSLeay();
101 #endif
102 #endif
103 		}
104 
105 	return default_RSA_meth;
106 	}
107 
108 const RSA_METHOD *RSA_get_method(const RSA *rsa)
109 	{
110 	return rsa->meth;
111 	}
112 
113 int RSA_set_method(RSA *rsa, const RSA_METHOD *meth)
114 	{
115 	/* NB: The caller is specifically setting a method, so it's not up to us
116 	 * to deal with which ENGINE it comes from. */
117 	const RSA_METHOD *mtmp;
118 	mtmp = rsa->meth;
119 	if (mtmp->finish) mtmp->finish(rsa);
120 #ifndef OPENSSL_NO_ENGINE
121 	if (rsa->engine)
122 		{
123 		ENGINE_finish(rsa->engine);
124 		rsa->engine = NULL;
125 		}
126 #endif
127 	rsa->meth = meth;
128 	if (meth->init) meth->init(rsa);
129 	return 1;
130 	}
131 
132 RSA *RSA_new_method(ENGINE *engine)
133 	{
134 	RSA *ret;
135 
136 	ret=(RSA *)OPENSSL_malloc(sizeof(RSA));
137 	if (ret == NULL)
138 		{
139 		RSAerr(RSA_F_RSA_NEW_METHOD,ERR_R_MALLOC_FAILURE);
140 		return NULL;
141 		}
142 
143 	ret->meth = RSA_get_default_method();
144 #ifndef OPENSSL_NO_ENGINE
145 	if (engine)
146 		{
147 		if (!ENGINE_init(engine))
148 			{
149 			RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB);
150 			OPENSSL_free(ret);
151 			return NULL;
152 			}
153 		ret->engine = engine;
154 		}
155 	else
156 		ret->engine = ENGINE_get_default_RSA();
157 	if(ret->engine)
158 		{
159 		ret->meth = ENGINE_get_RSA(ret->engine);
160 		if(!ret->meth)
161 			{
162 			RSAerr(RSA_F_RSA_NEW_METHOD,
163 				ERR_R_ENGINE_LIB);
164 			ENGINE_finish(ret->engine);
165 			OPENSSL_free(ret);
166 			return NULL;
167 			}
168 		}
169 #endif
170 
171 	ret->pad=0;
172 	ret->version=0;
173 	ret->n=NULL;
174 	ret->e=NULL;
175 	ret->d=NULL;
176 	ret->p=NULL;
177 	ret->q=NULL;
178 	ret->dmp1=NULL;
179 	ret->dmq1=NULL;
180 	ret->iqmp=NULL;
181 	ret->references=1;
182 	ret->_method_mod_n=NULL;
183 	ret->_method_mod_p=NULL;
184 	ret->_method_mod_q=NULL;
185 	ret->blinding=NULL;
186 	ret->mt_blinding=NULL;
187 	ret->bignum_data=NULL;
188 	ret->flags=ret->meth->flags;
189 	CRYPTO_new_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data);
190 	if ((ret->meth->init != NULL) && !ret->meth->init(ret))
191 		{
192 #ifndef OPENSSL_NO_ENGINE
193 		if (ret->engine)
194 			ENGINE_finish(ret->engine);
195 #endif
196 		CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data);
197 		OPENSSL_free(ret);
198 		ret=NULL;
199 		}
200 	return(ret);
201 	}
202 
203 void RSA_free(RSA *r)
204 	{
205 	int i;
206 
207 	if (r == NULL) return;
208 
209 	i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_RSA);
210 #ifdef REF_PRINT
211 	REF_PRINT("RSA",r);
212 #endif
213 	if (i > 0) return;
214 #ifdef REF_CHECK
215 	if (i < 0)
216 		{
217 		fprintf(stderr,"RSA_free, bad reference count\n");
218 		abort();
219 		}
220 #endif
221 
222 	if (r->meth->finish)
223 		r->meth->finish(r);
224 #ifndef OPENSSL_NO_ENGINE
225 	if (r->engine)
226 		ENGINE_finish(r->engine);
227 #endif
228 
229 	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, r, &r->ex_data);
230 
231 	if (r->n != NULL) BN_clear_free(r->n);
232 	if (r->e != NULL) BN_clear_free(r->e);
233 	if (r->d != NULL) BN_clear_free(r->d);
234 	if (r->p != NULL) BN_clear_free(r->p);
235 	if (r->q != NULL) BN_clear_free(r->q);
236 	if (r->dmp1 != NULL) BN_clear_free(r->dmp1);
237 	if (r->dmq1 != NULL) BN_clear_free(r->dmq1);
238 	if (r->iqmp != NULL) BN_clear_free(r->iqmp);
239 	if (r->blinding != NULL) BN_BLINDING_free(r->blinding);
240 	if (r->mt_blinding != NULL) BN_BLINDING_free(r->mt_blinding);
241 	if (r->bignum_data != NULL) OPENSSL_free_locked(r->bignum_data);
242 	OPENSSL_free(r);
243 	}
244 
245 int RSA_up_ref(RSA *r)
246 	{
247 	int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_RSA);
248 #ifdef REF_PRINT
249 	REF_PRINT("RSA",r);
250 #endif
251 #ifdef REF_CHECK
252 	if (i < 2)
253 		{
254 		fprintf(stderr, "RSA_up_ref, bad reference count\n");
255 		abort();
256 		}
257 #endif
258 	return ((i > 1) ? 1 : 0);
259 	}
260 
261 int RSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
262 	     CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
263         {
264 	return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_RSA, argl, argp,
265 				new_func, dup_func, free_func);
266         }
267 
268 int RSA_set_ex_data(RSA *r, int idx, void *arg)
269 	{
270 	return(CRYPTO_set_ex_data(&r->ex_data,idx,arg));
271 	}
272 
273 void *RSA_get_ex_data(const RSA *r, int idx)
274 	{
275 	return(CRYPTO_get_ex_data(&r->ex_data,idx));
276 	}
277 
278 int RSA_size(const RSA *r)
279 	{
280 	return(BN_num_bytes(r->n));
281 	}
282 
283 int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to,
284 	     RSA *rsa, int padding)
285 	{
286 	return(rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding));
287 	}
288 
289 int RSA_private_encrypt(int flen, const unsigned char *from, unsigned char *to,
290 	     RSA *rsa, int padding)
291 	{
292 	return(rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding));
293 	}
294 
295 int RSA_private_decrypt(int flen, const unsigned char *from, unsigned char *to,
296 	     RSA *rsa, int padding)
297 	{
298 	return(rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding));
299 	}
300 
301 int RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to,
302 	     RSA *rsa, int padding)
303 	{
304 	return(rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding));
305 	}
306 
307 int RSA_flags(const RSA *r)
308 	{
309 	return((r == NULL)?0:r->meth->flags);
310 	}
311 
312 void RSA_blinding_off(RSA *rsa)
313 	{
314 	if (rsa->blinding != NULL)
315 		{
316 		BN_BLINDING_free(rsa->blinding);
317 		rsa->blinding=NULL;
318 		}
319 	rsa->flags &= ~RSA_FLAG_BLINDING;
320 	rsa->flags |= RSA_FLAG_NO_BLINDING;
321 	}
322 
323 int RSA_blinding_on(RSA *rsa, BN_CTX *ctx)
324 	{
325 	int ret=0;
326 
327 	if (rsa->blinding != NULL)
328 		RSA_blinding_off(rsa);
329 
330 	rsa->blinding = RSA_setup_blinding(rsa, ctx);
331 	if (rsa->blinding == NULL)
332 		goto err;
333 
334 	rsa->flags |= RSA_FLAG_BLINDING;
335 	rsa->flags &= ~RSA_FLAG_NO_BLINDING;
336 	ret=1;
337 err:
338 	return(ret);
339 	}
340 
341 static BIGNUM *rsa_get_public_exp(const BIGNUM *d, const BIGNUM *p,
342 	const BIGNUM *q, BN_CTX *ctx)
343 {
344 	BIGNUM *ret = NULL, *r0, *r1, *r2;
345 
346 	if (d == NULL || p == NULL || q == NULL)
347 		return NULL;
348 
349 	BN_CTX_start(ctx);
350 	r0 = BN_CTX_get(ctx);
351 	r1 = BN_CTX_get(ctx);
352 	r2 = BN_CTX_get(ctx);
353 	if (r2 == NULL)
354 		goto err;
355 
356 	if (!BN_sub(r1, p, BN_value_one())) goto err;
357 	if (!BN_sub(r2, q, BN_value_one())) goto err;
358 	if (!BN_mul(r0, r1, r2, ctx)) goto err;
359 
360 	ret = BN_mod_inverse(NULL, d, r0, ctx);
361 err:
362 	BN_CTX_end(ctx);
363 	return ret;
364 }
365 
366 BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx)
367 {
368 	BIGNUM *e;
369 	BN_CTX *ctx;
370 	BN_BLINDING *ret = NULL;
371 
372 	if (in_ctx == NULL)
373 		{
374 		if ((ctx = BN_CTX_new()) == NULL) return 0;
375 		}
376 	else
377 		ctx = in_ctx;
378 
379 	BN_CTX_start(ctx);
380 	e  = BN_CTX_get(ctx);
381 	if (e == NULL)
382 		{
383 		RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE);
384 		goto err;
385 		}
386 
387 	if (rsa->e == NULL)
388 		{
389 		e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx);
390 		if (e == NULL)
391 			{
392 			RSAerr(RSA_F_RSA_SETUP_BLINDING, RSA_R_NO_PUBLIC_EXPONENT);
393 			goto err;
394 			}
395 		}
396 	else
397 		e = rsa->e;
398 
399 
400 	if ((RAND_status() == 0) && rsa->d != NULL && rsa->d->d != NULL)
401 		{
402 		/* if PRNG is not properly seeded, resort to secret
403 		 * exponent as unpredictable seed */
404 		RAND_add(rsa->d->d, rsa->d->dmax * sizeof rsa->d->d[0], 0.0);
405 		}
406 
407 	ret = BN_BLINDING_create_param(NULL, e, rsa->n, ctx,
408 			rsa->meth->bn_mod_exp, rsa->_method_mod_n);
409 	if (ret == NULL)
410 		{
411 		RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_BN_LIB);
412 		goto err;
413 		}
414 	BN_BLINDING_set_thread_id(ret, CRYPTO_thread_id());
415 err:
416 	BN_CTX_end(ctx);
417 	if (in_ctx == NULL)
418 		BN_CTX_free(ctx);
419 	if(rsa->e == NULL)
420 		BN_free(e);
421 
422 	return ret;
423 }
424 
425 int RSA_memory_lock(RSA *r)
426 	{
427 	int i,j,k,off;
428 	char *p;
429 	BIGNUM *bn,**t[6],*b;
430 	BN_ULONG *ul;
431 
432 	if (r->d == NULL) return(1);
433 	t[0]= &r->d;
434 	t[1]= &r->p;
435 	t[2]= &r->q;
436 	t[3]= &r->dmp1;
437 	t[4]= &r->dmq1;
438 	t[5]= &r->iqmp;
439 	k=sizeof(BIGNUM)*6;
440 	off=k/sizeof(BN_ULONG)+1;
441 	j=1;
442 	for (i=0; i<6; i++)
443 		j+= (*t[i])->top;
444 	if ((p=OPENSSL_malloc_locked((off+j)*sizeof(BN_ULONG))) == NULL)
445 		{
446 		RSAerr(RSA_F_RSA_MEMORY_LOCK,ERR_R_MALLOC_FAILURE);
447 		return(0);
448 		}
449 	bn=(BIGNUM *)p;
450 	ul=(BN_ULONG *)&(p[off]);
451 	for (i=0; i<6; i++)
452 		{
453 		b= *(t[i]);
454 		*(t[i])= &(bn[i]);
455 		memcpy((char *)&(bn[i]),(char *)b,sizeof(BIGNUM));
456 		bn[i].flags=BN_FLG_STATIC_DATA;
457 		bn[i].d=ul;
458 		memcpy((char *)ul,b->d,sizeof(BN_ULONG)*b->top);
459 		ul+=b->top;
460 		BN_clear_free(b);
461 		}
462 
463 	/* I should fix this so it can still be done */
464 	r->flags&= ~(RSA_FLAG_CACHE_PRIVATE|RSA_FLAG_CACHE_PUBLIC);
465 
466 	r->bignum_data=p;
467 	return(1);
468 	}
469