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
70#ifdef OPENSSL_FIPS
71#include <openssl/fips.h>
72#endif
73
74const char RSA_version[]="RSA" OPENSSL_VERSION_PTEXT;
75
76static const RSA_METHOD *default_RSA_meth=NULL;
77
78RSA *RSA_new(void)
79	{
80	RSA *r=RSA_new_method(NULL);
81
82	return r;
83	}
84
85void RSA_set_default_method(const RSA_METHOD *meth)
86	{
87	default_RSA_meth = meth;
88	}
89
90const RSA_METHOD *RSA_get_default_method(void)
91	{
92	if (default_RSA_meth == NULL)
93		{
94#ifdef OPENSSL_FIPS
95		if (FIPS_mode())
96			return FIPS_rsa_pkcs1_ssleay();
97		else
98			return RSA_PKCS1_SSLeay();
99#else
100#ifdef RSA_NULL
101		default_RSA_meth=RSA_null_method();
102#else
103		default_RSA_meth=RSA_PKCS1_SSLeay();
104#endif
105#endif
106		}
107
108	return default_RSA_meth;
109	}
110
111const RSA_METHOD *RSA_get_method(const RSA *rsa)
112	{
113	return rsa->meth;
114	}
115
116int RSA_set_method(RSA *rsa, const RSA_METHOD *meth)
117	{
118	/* NB: The caller is specifically setting a method, so it's not up to us
119	 * to deal with which ENGINE it comes from. */
120	const RSA_METHOD *mtmp;
121	mtmp = rsa->meth;
122	if (mtmp->finish) mtmp->finish(rsa);
123#ifndef OPENSSL_NO_ENGINE
124	if (rsa->engine)
125		{
126		ENGINE_finish(rsa->engine);
127		rsa->engine = NULL;
128		}
129#endif
130	rsa->meth = meth;
131	if (meth->init) meth->init(rsa);
132	return 1;
133	}
134
135RSA *RSA_new_method(ENGINE *engine)
136	{
137	RSA *ret;
138
139	ret=(RSA *)OPENSSL_malloc(sizeof(RSA));
140	if (ret == NULL)
141		{
142		RSAerr(RSA_F_RSA_NEW_METHOD,ERR_R_MALLOC_FAILURE);
143		return NULL;
144		}
145
146	ret->meth = RSA_get_default_method();
147#ifndef OPENSSL_NO_ENGINE
148	if (engine)
149		{
150		if (!ENGINE_init(engine))
151			{
152			RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB);
153			OPENSSL_free(ret);
154			return NULL;
155			}
156		ret->engine = engine;
157		}
158	else
159		ret->engine = ENGINE_get_default_RSA();
160	if(ret->engine)
161		{
162		ret->meth = ENGINE_get_RSA(ret->engine);
163		if(!ret->meth)
164			{
165			RSAerr(RSA_F_RSA_NEW_METHOD,
166				ERR_R_ENGINE_LIB);
167			ENGINE_finish(ret->engine);
168			OPENSSL_free(ret);
169			return NULL;
170			}
171		}
172#endif
173
174	ret->pad=0;
175	ret->version=0;
176	ret->n=NULL;
177	ret->e=NULL;
178	ret->d=NULL;
179	ret->p=NULL;
180	ret->q=NULL;
181	ret->dmp1=NULL;
182	ret->dmq1=NULL;
183	ret->iqmp=NULL;
184	ret->references=1;
185	ret->_method_mod_n=NULL;
186	ret->_method_mod_p=NULL;
187	ret->_method_mod_q=NULL;
188	ret->blinding=NULL;
189	ret->mt_blinding=NULL;
190	ret->bignum_data=NULL;
191	ret->flags=ret->meth->flags & ~RSA_FLAG_NON_FIPS_ALLOW;
192	if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data))
193		{
194#ifndef OPENSSL_NO_ENGINE
195	if (ret->engine)
196		ENGINE_finish(ret->engine);
197#endif
198		OPENSSL_free(ret);
199		return(NULL);
200		}
201
202	if ((ret->meth->init != NULL) && !ret->meth->init(ret))
203		{
204#ifndef OPENSSL_NO_ENGINE
205		if (ret->engine)
206			ENGINE_finish(ret->engine);
207#endif
208		CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data);
209		OPENSSL_free(ret);
210		ret=NULL;
211		}
212	return(ret);
213	}
214
215void RSA_free(RSA *r)
216	{
217	int i;
218
219	if (r == NULL) return;
220
221	i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_RSA);
222#ifdef REF_PRINT
223	REF_PRINT("RSA",r);
224#endif
225	if (i > 0) return;
226#ifdef REF_CHECK
227	if (i < 0)
228		{
229		fprintf(stderr,"RSA_free, bad reference count\n");
230		abort();
231		}
232#endif
233
234	if (r->meth->finish)
235		r->meth->finish(r);
236#ifndef OPENSSL_NO_ENGINE
237	if (r->engine)
238		ENGINE_finish(r->engine);
239#endif
240
241	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, r, &r->ex_data);
242
243	if (r->n != NULL) BN_clear_free(r->n);
244	if (r->e != NULL) BN_clear_free(r->e);
245	if (r->d != NULL) BN_clear_free(r->d);
246	if (r->p != NULL) BN_clear_free(r->p);
247	if (r->q != NULL) BN_clear_free(r->q);
248	if (r->dmp1 != NULL) BN_clear_free(r->dmp1);
249	if (r->dmq1 != NULL) BN_clear_free(r->dmq1);
250	if (r->iqmp != NULL) BN_clear_free(r->iqmp);
251	if (r->blinding != NULL) BN_BLINDING_free(r->blinding);
252	if (r->mt_blinding != NULL) BN_BLINDING_free(r->mt_blinding);
253	if (r->bignum_data != NULL) OPENSSL_free_locked(r->bignum_data);
254	OPENSSL_free(r);
255	}
256
257int RSA_up_ref(RSA *r)
258	{
259	int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_RSA);
260#ifdef REF_PRINT
261	REF_PRINT("RSA",r);
262#endif
263#ifdef REF_CHECK
264	if (i < 2)
265		{
266		fprintf(stderr, "RSA_up_ref, bad reference count\n");
267		abort();
268		}
269#endif
270	return ((i > 1) ? 1 : 0);
271	}
272
273int RSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
274	     CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
275        {
276	return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_RSA, argl, argp,
277				new_func, dup_func, free_func);
278        }
279
280int RSA_set_ex_data(RSA *r, int idx, void *arg)
281	{
282	return(CRYPTO_set_ex_data(&r->ex_data,idx,arg));
283	}
284
285void *RSA_get_ex_data(const RSA *r, int idx)
286	{
287	return(CRYPTO_get_ex_data(&r->ex_data,idx));
288	}
289
290int RSA_memory_lock(RSA *r)
291	{
292	int i,j,k,off;
293	char *p;
294	BIGNUM *bn,**t[6],*b;
295	BN_ULONG *ul;
296
297	if (r->d == NULL) return(1);
298	t[0]= &r->d;
299	t[1]= &r->p;
300	t[2]= &r->q;
301	t[3]= &r->dmp1;
302	t[4]= &r->dmq1;
303	t[5]= &r->iqmp;
304	k=sizeof(BIGNUM)*6;
305	off=k/sizeof(BN_ULONG)+1;
306	j=1;
307	for (i=0; i<6; i++)
308		j+= (*t[i])->top;
309	if ((p=OPENSSL_malloc_locked((off+j)*sizeof(BN_ULONG))) == NULL)
310		{
311		RSAerr(RSA_F_RSA_MEMORY_LOCK,ERR_R_MALLOC_FAILURE);
312		return(0);
313		}
314	bn=(BIGNUM *)p;
315	ul=(BN_ULONG *)&(p[off]);
316	for (i=0; i<6; i++)
317		{
318		b= *(t[i]);
319		*(t[i])= &(bn[i]);
320		memcpy((char *)&(bn[i]),(char *)b,sizeof(BIGNUM));
321		bn[i].flags=BN_FLG_STATIC_DATA;
322		bn[i].d=ul;
323		memcpy((char *)ul,b->d,sizeof(BN_ULONG)*b->top);
324		ul+=b->top;
325		BN_clear_free(b);
326		}
327
328	/* I should fix this so it can still be done */
329	r->flags&= ~(RSA_FLAG_CACHE_PRIVATE|RSA_FLAG_CACHE_PUBLIC);
330
331	r->bignum_data=p;
332	return(1);
333	}
334