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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 RSA_METHOD *default_RSA_meth=NULL;
70static int rsa_meth_num=0;
71static STACK_OF(CRYPTO_EX_DATA_FUNCS) *rsa_meth=NULL;
72
73RSA *RSA_new(void)
74 {
75 return(RSA_new_method(NULL));
76 }
77
78void RSA_set_default_openssl_method(RSA_METHOD *meth)
79 {
80 ENGINE *e;
81 /* We'll need to notify the "openssl" ENGINE of this
82 * change too. We won't bother locking things down at
83 * our end as there was never any locking in these
84 * functions! */
85 if(default_RSA_meth != meth)
86 {
87 default_RSA_meth = meth;
88 e = ENGINE_by_id("openssl");
89 if(e)
90 {
91 ENGINE_set_RSA(e, meth);
92 ENGINE_free(e);
93 }
94 }
95 }
96
97RSA_METHOD *RSA_get_default_openssl_method(void)
98{
99 if (default_RSA_meth == NULL)
100 {
101#ifdef RSA_NULL
102 default_RSA_meth=RSA_null_method();
103#else
104#ifdef RSAref
105 default_RSA_meth=RSA_PKCS1_RSAref();
106#else
107 default_RSA_meth=RSA_PKCS1_SSLeay();
108#endif
109#endif
110 }
111
112 return default_RSA_meth;
113}
114
115RSA_METHOD *RSA_get_method(RSA *rsa)
116{
117 return ENGINE_get_RSA(rsa->engine);
118}
119
120#if 0
121RSA_METHOD *RSA_set_method(RSA *rsa, RSA_METHOD *meth)
122{
123 RSA_METHOD *mtmp;
124 mtmp = rsa->meth;
125 if (mtmp->finish) mtmp->finish(rsa);
126 rsa->meth = meth;
127 if (meth->init) meth->init(rsa);
128 return mtmp;
129}
130#else
131int RSA_set_method(RSA *rsa, ENGINE *engine)
132{
133 ENGINE *mtmp;
134 RSA_METHOD *meth;
135 mtmp = rsa->engine;
136 meth = ENGINE_get_RSA(mtmp);
137 if (!ENGINE_init(engine))
138 return 0;
139 if (meth->finish) meth->finish(rsa);
140 rsa->engine = engine;
141 meth = ENGINE_get_RSA(engine);
142 if (meth->init) meth->init(rsa);
143 /* SHOULD ERROR CHECK THIS!!! */
144 ENGINE_finish(mtmp);
145 return 1;
146}
147#endif
148
149#if 0
150RSA *RSA_new_method(RSA_METHOD *meth)
151#else
152RSA *RSA_new_method(ENGINE *engine)
153#endif
154 {
155 RSA_METHOD *meth;
156 RSA *ret;
157
158 ret=(RSA *)OPENSSL_malloc(sizeof(RSA));
159 if (ret == NULL)
160 {
161 RSAerr(RSA_F_RSA_NEW_METHOD,ERR_R_MALLOC_FAILURE);
162 return(NULL);
163 }
164
165 if (engine == NULL)
166 {
167 if((ret->engine=ENGINE_get_default_RSA()) == NULL)
168 {
169 OPENSSL_free(ret);
170 return NULL;
171 }
172 }
173 else
174 ret->engine=engine;
175 meth = ENGINE_get_RSA(ret->engine);
176
177 ret->pad=0;
178 ret->version=0;
179 ret->n=NULL;
180 ret->e=NULL;
181 ret->d=NULL;
182 ret->p=NULL;
183 ret->q=NULL;
184 ret->dmp1=NULL;
185 ret->dmq1=NULL;
186 ret->iqmp=NULL;
187 ret->references=1;
188 ret->_method_mod_n=NULL;
189 ret->_method_mod_p=NULL;
190 ret->_method_mod_q=NULL;
191 ret->blinding=NULL;
192 ret->bignum_data=NULL;
193 ret->flags=meth->flags;
194 CRYPTO_new_ex_data(rsa_meth,ret,&ret->ex_data);
195 if ((meth->init != NULL) && !meth->init(ret))
196 {
197 CRYPTO_free_ex_data(rsa_meth,ret,&ret->ex_data);
198 OPENSSL_free(ret);
199 ret=NULL;
200 }
201 return(ret);
202 }
203
204void RSA_free(RSA *r)
205 {
206 RSA_METHOD *meth;
207 int i;
208
209 if (r == NULL) return;
210
211 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_RSA);
212#ifdef REF_PRINT
213 REF_PRINT("RSA",r);
214#endif
215 if (i > 0) return;
216#ifdef REF_CHECK
217 if (i < 0)
218 {
219 fprintf(stderr,"RSA_free, bad reference count\n");
220 abort();
221 }
222#endif
223
224 meth = ENGINE_get_RSA(r->engine);
225 if (meth->finish != NULL)
226 meth->finish(r);
227 ENGINE_finish(r->engine);
228
229 CRYPTO_free_ex_data(rsa_meth,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->bignum_data != NULL) OPENSSL_free_locked(r->bignum_data);
241 OPENSSL_free(r);
242 }
243
244int RSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
245 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
246 {
247 rsa_meth_num++;
248 return(CRYPTO_get_ex_new_index(rsa_meth_num-1,
249 &rsa_meth,argl,argp,new_func,dup_func,free_func));
250 }
251
252int RSA_set_ex_data(RSA *r, int idx, void *arg)
253 {
254 return(CRYPTO_set_ex_data(&r->ex_data,idx,arg));
255 }
256
257void *RSA_get_ex_data(RSA *r, int idx)
258 {
259 return(CRYPTO_get_ex_data(&r->ex_data,idx));
260 }
261
262int RSA_size(RSA *r)
263 {
264 return(BN_num_bytes(r->n));
265 }
266
267int RSA_public_encrypt(int flen, unsigned char *from, unsigned char *to,
268 RSA *rsa, int padding)
269 {
270 return(ENGINE_get_RSA(rsa->engine)->rsa_pub_enc(flen,
271 from, to, rsa, padding));
272 }
273
274int RSA_private_encrypt(int flen, unsigned char *from, unsigned char *to,
275 RSA *rsa, int padding)
276 {
277 return(ENGINE_get_RSA(rsa->engine)->rsa_priv_enc(flen,
278 from, to, rsa, padding));
279 }
280
281int RSA_private_decrypt(int flen, unsigned char *from, unsigned char *to,
282 RSA *rsa, int padding)
283 {
284 return(ENGINE_get_RSA(rsa->engine)->rsa_priv_dec(flen,
285 from, to, rsa, padding));
286 }
287
288int RSA_public_decrypt(int flen, unsigned char *from, unsigned char *to,
289 RSA *rsa, int padding)
290 {
291 return(ENGINE_get_RSA(rsa->engine)->rsa_pub_dec(flen,
292 from, to, rsa, padding));
293 }
294
295int RSA_flags(RSA *r)
296 {
297 return((r == NULL)?0:ENGINE_get_RSA(r->engine)->flags);
298 }
299
300void RSA_blinding_off(RSA *rsa)
301 {
302 if (rsa->blinding != NULL)
303 {
304 BN_BLINDING_free(rsa->blinding);
305 rsa->blinding=NULL;
306 }
307 rsa->flags&= ~RSA_FLAG_BLINDING;
308 }
309
310int RSA_blinding_on(RSA *rsa, BN_CTX *p_ctx)
311 {
312 BIGNUM *A,*Ai;
313 BN_CTX *ctx;
314 int ret=0;
315
316 if (p_ctx == NULL)
317 {
318 if ((ctx=BN_CTX_new()) == NULL) goto err;
319 }
320 else
321 ctx=p_ctx;
322
323 if (rsa->blinding != NULL)
324 BN_BLINDING_free(rsa->blinding);
325
326 BN_CTX_start(ctx);
327 A = BN_CTX_get(ctx);
328 if (!BN_rand_range(A,rsa->n)) goto err;
329 if ((Ai=BN_mod_inverse(NULL,A,rsa->n,ctx)) == NULL) goto err;
330
331 if (!ENGINE_get_RSA(rsa->engine)->bn_mod_exp(A,A,
332 rsa->e,rsa->n,ctx,rsa->_method_mod_n))
333 goto err;
334 rsa->blinding=BN_BLINDING_new(A,Ai,rsa->n);
335 rsa->flags|=RSA_FLAG_BLINDING;
336 BN_free(Ai);
337 ret=1;
338err:
339 BN_CTX_end(ctx);
340 if (ctx != p_ctx) BN_CTX_free(ctx);
341 return(ret);
342 }
343
344int RSA_memory_lock(RSA *r)
345 {
346 int i,j,k,off;
347 char *p;
348 BIGNUM *bn,**t[6],*b;
349 BN_ULONG *ul;
350
351 if (r->d == NULL) return(1);
352 t[0]= &r->d;
353 t[1]= &r->p;
354 t[2]= &r->q;
355 t[3]= &r->dmp1;
356 t[4]= &r->dmq1;
357 t[5]= &r->iqmp;
358 k=sizeof(BIGNUM)*6;
359 off=k/sizeof(BN_ULONG)+1;
360 j=1;
361 for (i=0; i<6; i++)
362 j+= (*t[i])->top;
363 if ((p=OPENSSL_malloc_locked((off+j)*sizeof(BN_ULONG))) == NULL)
364 {
365 RSAerr(RSA_F_MEMORY_LOCK,ERR_R_MALLOC_FAILURE);
366 return(0);
367 }
368 bn=(BIGNUM *)p;
369 ul=(BN_ULONG *)&(p[off]);
370 for (i=0; i<6; i++)
371 {
372 b= *(t[i]);
373 *(t[i])= &(bn[i]);
374 memcpy((char *)&(bn[i]),(char *)b,sizeof(BIGNUM));
375 bn[i].flags=BN_FLG_STATIC_DATA;
376 bn[i].d=ul;
377 memcpy((char *)ul,b->d,sizeof(BN_ULONG)*b->top);
378 ul+=b->top;
379 BN_clear_free(b);
380 }
381
382 /* I should fix this so it can still be done */
383 r->flags&= ~(RSA_FLAG_CACHE_PRIVATE|RSA_FLAG_CACHE_PUBLIC);
384
385 r->bignum_data=p;
386 return(1);
387 }
388
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