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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/engine.h>
66
67const char *RSA_version="RSA" OPENSSL_VERSION_PTEXT;
68
69static const RSA_METHOD *default_RSA_meth=NULL;
70
71RSA *RSA_new(void)
72 {
73 RSA *r=RSA_new_method(NULL);
74
75#ifndef OPENSSL_NO_FORCE_RSA_BLINDING
76 r->flags|=RSA_FLAG_BLINDING;
77#endif
78
79 return r;
80 }
81
82void RSA_set_default_method(const RSA_METHOD *meth)
83 {
84 default_RSA_meth = meth;
85 }
86
87const RSA_METHOD *RSA_get_default_method(void)
88 {
89 if (default_RSA_meth == NULL)
90 {
91#ifdef RSA_NULL
92 default_RSA_meth=RSA_null_method();
93#else
94#if 0 /* was: #ifdef RSAref */
95 default_RSA_meth=RSA_PKCS1_RSAref();
96#else
97 default_RSA_meth=RSA_PKCS1_SSLeay();
98#endif
99#endif
100 }
101
102 return default_RSA_meth;
103 }
104
105const RSA_METHOD *RSA_get_method(const RSA *rsa)
106 {
107 return rsa->meth;
108 }
109
110int RSA_set_method(RSA *rsa, const RSA_METHOD *meth)
111 {
112 /* NB: The caller is specifically setting a method, so it's not up to us
113 * to deal with which ENGINE it comes from. */
114 const RSA_METHOD *mtmp;
115 mtmp = rsa->meth;
116 if (mtmp->finish) mtmp->finish(rsa);
117 if (rsa->engine)
118 {
119 ENGINE_finish(rsa->engine);
120 rsa->engine = NULL;
121 }
122 rsa->meth = meth;
123 if (meth->init) meth->init(rsa);
124 return 1;
125 }
126
127RSA *RSA_new_method(ENGINE *engine)
128 {
129 RSA *ret;
130
131 ret=(RSA *)OPENSSL_malloc(sizeof(RSA));
132 if (ret == NULL)
133 {
134 RSAerr(RSA_F_RSA_NEW_METHOD,ERR_R_MALLOC_FAILURE);
135 return NULL;
136 }
137
138 ret->meth = RSA_get_default_method();
139 if (engine)
140 {
141 if (!ENGINE_init(engine))
142 {
143 RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB);
144 OPENSSL_free(ret);
145 return NULL;
146 }
147 ret->engine = engine;
148 }
149 else
150 ret->engine = ENGINE_get_default_RSA();
151 if(ret->engine)
152 {
153 ret->meth = ENGINE_get_RSA(ret->engine);
154 if(!ret->meth)
155 {
156 RSAerr(RSA_F_RSA_NEW_METHOD,
157 ERR_R_ENGINE_LIB);
158 ENGINE_finish(ret->engine);
159 OPENSSL_free(ret);
160 return NULL;
161 }
162 }
163
164 ret->pad=0;
165 ret->version=0;
166 ret->n=NULL;
167 ret->e=NULL;
168 ret->d=NULL;
169 ret->p=NULL;
170 ret->q=NULL;
171 ret->dmp1=NULL;
172 ret->dmq1=NULL;
173 ret->iqmp=NULL;
174 ret->references=1;
175 ret->_method_mod_n=NULL;
176 ret->_method_mod_p=NULL;
177 ret->_method_mod_q=NULL;
178 ret->blinding=NULL;
179 ret->bignum_data=NULL;
180 ret->flags=ret->meth->flags;
181 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data);
182 if ((ret->meth->init != NULL) && !ret->meth->init(ret))
183 {
184 if (ret->engine)
185 ENGINE_finish(ret->engine);
186 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data);
187 OPENSSL_free(ret);
188 ret=NULL;
189 }
190 return(ret);
191 }
192
193void RSA_free(RSA *r)
194 {
195 int i;
196
197 if (r == NULL) return;
198
199 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_RSA);
200#ifdef REF_PRINT
201 REF_PRINT("RSA",r);
202#endif
203 if (i > 0) return;
204#ifdef REF_CHECK
205 if (i < 0)
206 {
207 fprintf(stderr,"RSA_free, bad reference count\n");
208 abort();
209 }
210#endif
211
212 if (r->meth->finish)
213 r->meth->finish(r);
214 if (r->engine)
215 ENGINE_finish(r->engine);
216
217 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, r, &r->ex_data);
218
219 if (r->n != NULL) BN_clear_free(r->n);
220 if (r->e != NULL) BN_clear_free(r->e);
221 if (r->d != NULL) BN_clear_free(r->d);
222 if (r->p != NULL) BN_clear_free(r->p);
223 if (r->q != NULL) BN_clear_free(r->q);
224 if (r->dmp1 != NULL) BN_clear_free(r->dmp1);
225 if (r->dmq1 != NULL) BN_clear_free(r->dmq1);
226 if (r->iqmp != NULL) BN_clear_free(r->iqmp);
227 if (r->blinding != NULL) BN_BLINDING_free(r->blinding);
228 if (r->bignum_data != NULL) OPENSSL_free_locked(r->bignum_data);
229 OPENSSL_free(r);
230 }
231
232int RSA_up_ref(RSA *r)
233 {
234 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_RSA);
235#ifdef REF_PRINT
236 REF_PRINT("RSA",r);
237#endif
238#ifdef REF_CHECK
239 if (i < 2)
240 {
241 fprintf(stderr, "RSA_up_ref, bad reference count\n");
242 abort();
243 }
244#endif
245 return ((i > 1) ? 1 : 0);
246 }
247
248int RSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
249 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
250 {
251 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_RSA, argl, argp,
252 new_func, dup_func, free_func);
253 }
254
255int RSA_set_ex_data(RSA *r, int idx, void *arg)
256 {
257 return(CRYPTO_set_ex_data(&r->ex_data,idx,arg));
258 }
259
260void *RSA_get_ex_data(const RSA *r, int idx)
261 {
262 return(CRYPTO_get_ex_data(&r->ex_data,idx));
263 }
264
265int RSA_size(const RSA *r)
266 {
267 return(BN_num_bytes(r->n));
268 }
269
270int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to,
271 RSA *rsa, int padding)
272 {
273 return(rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding));
274 }
275
276int RSA_private_encrypt(int flen, const unsigned char *from, unsigned char *to,
277 RSA *rsa, int padding)
278 {
279 return(rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding));
280 }
281
282int RSA_private_decrypt(int flen, const unsigned char *from, unsigned char *to,
283 RSA *rsa, int padding)
284 {
285 return(rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding));
286 }
287
288int RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to,
289 RSA *rsa, int padding)
290 {
291 return(rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding));
292 }
293
294int RSA_flags(const RSA *r)
295 {
296 return((r == NULL)?0:r->meth->flags);
297 }
298
299void RSA_blinding_off(RSA *rsa)
300 {
301 if (rsa->blinding != NULL)
302 {
303 BN_BLINDING_free(rsa->blinding);
304 rsa->blinding=NULL;
305 }
306 rsa->flags&= ~RSA_FLAG_BLINDING;
307 }
308
309int RSA_blinding_on(RSA *rsa, BN_CTX *p_ctx)
310 {
311 BIGNUM *A,*Ai;
312 BN_CTX *ctx;
313 int ret=0;
314
315 if (p_ctx == NULL)
316 {
317 if ((ctx=BN_CTX_new()) == NULL) goto err;
318 }
319 else
320 ctx=p_ctx;
321
322 if (rsa->blinding != NULL)
323 BN_BLINDING_free(rsa->blinding);
324
325 BN_CTX_start(ctx);
326 A = BN_CTX_get(ctx);
327 if (!BN_rand_range(A,rsa->n)) goto err;
328 if ((Ai=BN_mod_inverse(NULL,A,rsa->n,ctx)) == NULL) goto err;
329
330 if (!rsa->meth->bn_mod_exp(A,A,rsa->e,rsa->n,ctx,rsa->_method_mod_n))
331 goto err;
332 rsa->blinding=BN_BLINDING_new(A,Ai,rsa->n);
333 rsa->flags|=RSA_FLAG_BLINDING;
334 BN_free(Ai);
335 ret=1;
336err:
337 BN_CTX_end(ctx);
338 if (ctx != p_ctx) BN_CTX_free(ctx);
339 return(ret);
340 }
341
342int RSA_memory_lock(RSA *r)
343 {
344 int i,j,k,off;
345 char *p;
346 BIGNUM *bn,**t[6],*b;
347 BN_ULONG *ul;
348
349 if (r->d == NULL) return(1);
350 t[0]= &r->d;
351 t[1]= &r->p;
352 t[2]= &r->q;
353 t[3]= &r->dmp1;
354 t[4]= &r->dmq1;
355 t[5]= &r->iqmp;
356 k=sizeof(BIGNUM)*6;
357 off=k/sizeof(BN_ULONG)+1;
358 j=1;
359 for (i=0; i<6; i++)
360 j+= (*t[i])->top;
361 if ((p=OPENSSL_malloc_locked((off+j)*sizeof(BN_ULONG))) == NULL)
362 {
363 RSAerr(RSA_F_MEMORY_LOCK,ERR_R_MALLOC_FAILURE);
364 return(0);
365 }
366 bn=(BIGNUM *)p;
367 ul=(BN_ULONG *)&(p[off]);
368 for (i=0; i<6; i++)
369 {
370 b= *(t[i]);
371 *(t[i])= &(bn[i]);
372 memcpy((char *)&(bn[i]),(char *)b,sizeof(BIGNUM));
373 bn[i].flags=BN_FLG_STATIC_DATA;
374 bn[i].d=ul;
375 memcpy((char *)ul,b->d,sizeof(BN_ULONG)*b->top);
376 ul+=b->top;
377 BN_clear_free(b);
378 }
379
380 /* I should fix this so it can still be done */
381 r->flags&= ~(RSA_FLAG_CACHE_PRIVATE|RSA_FLAG_CACHE_PUBLIC);
382
383 r->bignum_data=p;
384 return(1);
385 }
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