rsa_eng.c revision 296465 
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#ifdef OPENSSL_FIPS
84    if (FIPS_mode() && !(meth->flags & RSA_FLAG_FIPS_METHOD)) {
85        RSAerr(RSA_F_RSA_SET_DEFAULT_METHOD, RSA_R_NON_FIPS_METHOD);
86        return;
87    }
88#endif
89    default_RSA_meth = meth;
90}
91
92const RSA_METHOD *RSA_get_default_method(void)
93{
94    if (default_RSA_meth == NULL) {
95#ifdef RSA_NULL
96        default_RSA_meth = RSA_null_method();
97#else
98# if 0                          /* was: #ifdef RSAref */
99        default_RSA_meth = RSA_PKCS1_RSAref();
100# else
101        default_RSA_meth = RSA_PKCS1_SSLeay();
102# endif
103#endif
104    }
105
106    return default_RSA_meth;
107}
108
109const RSA_METHOD *RSA_get_method(const RSA *rsa)
110{
111    return rsa->meth;
112}
113
114int RSA_set_method(RSA *rsa, const RSA_METHOD *meth)
115{
116    /*
117     * NB: The caller is specifically setting a method, so it's not up to us
118     * to deal with which ENGINE it comes from.
119     */
120    const RSA_METHOD *mtmp;
121#ifdef OPENSSL_FIPS
122    if (FIPS_mode() && !(meth->flags & RSA_FLAG_FIPS_METHOD)) {
123        RSAerr(RSA_F_RSA_SET_METHOD, RSA_R_NON_FIPS_METHOD);
124        return 0;
125    }
126#endif
127    mtmp = rsa->meth;
128    if (mtmp->finish)
129        mtmp->finish(rsa);
130#ifndef OPENSSL_NO_ENGINE
131    if (rsa->engine) {
132        ENGINE_finish(rsa->engine);
133        rsa->engine = NULL;
134    }
135#endif
136    rsa->meth = meth;
137    if (meth->init)
138        meth->init(rsa);
139    return 1;
140}
141
142RSA *RSA_new_method(ENGINE *engine)
143{
144    RSA *ret;
145
146    ret = (RSA *)OPENSSL_malloc(sizeof(RSA));
147    if (ret == NULL) {
148        RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
149        return NULL;
150    }
151
152    ret->meth = RSA_get_default_method();
153#ifndef OPENSSL_NO_ENGINE
154    if (engine) {
155        if (!ENGINE_init(engine)) {
156            RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB);
157            OPENSSL_free(ret);
158            return NULL;
159        }
160        ret->engine = engine;
161    } else
162        ret->engine = ENGINE_get_default_RSA();
163    if (ret->engine) {
164        ret->meth = ENGINE_get_RSA(ret->engine);
165        if (!ret->meth) {
166            RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB);
167            ENGINE_finish(ret->engine);
168            OPENSSL_free(ret);
169            return NULL;
170        }
171    }
172#endif
173#ifdef OPENSSL_FIPS
174    if (FIPS_mode() && !(ret->meth->flags & RSA_FLAG_FIPS_METHOD)) {
175        RSAerr(RSA_F_RSA_NEW_METHOD, RSA_R_NON_FIPS_METHOD);
176# ifndef OPENSSL_NO_ENGINE
177        if (ret->engine)
178            ENGINE_finish(ret->engine);
179# endif
180        OPENSSL_free(ret);
181        return NULL;
182    }
183#endif
184
185    ret->pad = 0;
186    ret->version = 0;
187    ret->n = NULL;
188    ret->e = NULL;
189    ret->d = NULL;
190    ret->p = NULL;
191    ret->q = NULL;
192    ret->dmp1 = NULL;
193    ret->dmq1 = NULL;
194    ret->iqmp = NULL;
195    ret->references = 1;
196    ret->_method_mod_n = NULL;
197    ret->_method_mod_p = NULL;
198    ret->_method_mod_q = NULL;
199    ret->blinding = NULL;
200    ret->mt_blinding = NULL;
201    ret->bignum_data = NULL;
202    ret->flags = ret->meth->flags & ~RSA_FLAG_NON_FIPS_ALLOW;
203    if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data)) {
204#ifndef OPENSSL_NO_ENGINE
205        if (ret->engine)
206            ENGINE_finish(ret->engine);
207#endif
208        OPENSSL_free(ret);
209        return (NULL);
210    }
211
212    if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
213#ifndef OPENSSL_NO_ENGINE
214        if (ret->engine)
215            ENGINE_finish(ret->engine);
216#endif
217        CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data);
218        OPENSSL_free(ret);
219        ret = NULL;
220    }
221    return (ret);
222}
223
224void RSA_free(RSA *r)
225{
226    int i;
227
228    if (r == NULL)
229        return;
230
231    i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_RSA);
232#ifdef REF_PRINT
233    REF_PRINT("RSA", r);
234#endif
235    if (i > 0)
236        return;
237#ifdef REF_CHECK
238    if (i < 0) {
239        fprintf(stderr, "RSA_free, bad reference count\n");
240        abort();
241    }
242#endif
243
244    if (r->meth->finish)
245        r->meth->finish(r);
246#ifndef OPENSSL_NO_ENGINE
247    if (r->engine)
248        ENGINE_finish(r->engine);
249#endif
250
251    CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, r, &r->ex_data);
252
253    if (r->n != NULL)
254        BN_clear_free(r->n);
255    if (r->e != NULL)
256        BN_clear_free(r->e);
257    if (r->d != NULL)
258        BN_clear_free(r->d);
259    if (r->p != NULL)
260        BN_clear_free(r->p);
261    if (r->q != NULL)
262        BN_clear_free(r->q);
263    if (r->dmp1 != NULL)
264        BN_clear_free(r->dmp1);
265    if (r->dmq1 != NULL)
266        BN_clear_free(r->dmq1);
267    if (r->iqmp != NULL)
268        BN_clear_free(r->iqmp);
269    if (r->blinding != NULL)
270        BN_BLINDING_free(r->blinding);
271    if (r->mt_blinding != NULL)
272        BN_BLINDING_free(r->mt_blinding);
273    if (r->bignum_data != NULL)
274        OPENSSL_free_locked(r->bignum_data);
275    OPENSSL_free(r);
276}
277
278int RSA_up_ref(RSA *r)
279{
280    int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_RSA);
281#ifdef REF_PRINT
282    REF_PRINT("RSA", r);
283#endif
284#ifdef REF_CHECK
285    if (i < 2) {
286        fprintf(stderr, "RSA_up_ref, bad reference count\n");
287        abort();
288    }
289#endif
290    return ((i > 1) ? 1 : 0);
291}
292
293int RSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
294                         CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
295{
296    return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_RSA, argl, argp,
297                                   new_func, dup_func, free_func);
298}
299
300int RSA_set_ex_data(RSA *r, int idx, void *arg)
301{
302    return (CRYPTO_set_ex_data(&r->ex_data, idx, arg));
303}
304
305void *RSA_get_ex_data(const RSA *r, int idx)
306{
307    return (CRYPTO_get_ex_data(&r->ex_data, idx));
308}
309
310int RSA_flags(const RSA *r)
311{
312    return ((r == NULL) ? 0 : r->meth->flags);
313}
314
315int RSA_memory_lock(RSA *r)
316{
317    int i, j, k, off;
318    char *p;
319    BIGNUM *bn, **t[6], *b;
320    BN_ULONG *ul;
321
322    if (r->d == NULL)
323        return (1);
324    t[0] = &r->d;
325    t[1] = &r->p;
326    t[2] = &r->q;
327    t[3] = &r->dmp1;
328    t[4] = &r->dmq1;
329    t[5] = &r->iqmp;
330    k = sizeof(BIGNUM) * 6;
331    off = k / sizeof(BN_ULONG) + 1;
332    j = 1;
333    for (i = 0; i < 6; i++)
334        j += (*t[i])->top;
335    if ((p = OPENSSL_malloc_locked((off + j) * sizeof(BN_ULONG))) == NULL) {
336        RSAerr(RSA_F_RSA_MEMORY_LOCK, ERR_R_MALLOC_FAILURE);
337        return (0);
338    }
339    bn = (BIGNUM *)p;
340    ul = (BN_ULONG *)&(p[off]);
341    for (i = 0; i < 6; i++) {
342        b = *(t[i]);
343        *(t[i]) = &(bn[i]);
344        memcpy((char *)&(bn[i]), (char *)b, sizeof(BIGNUM));
345        bn[i].flags = BN_FLG_STATIC_DATA;
346        bn[i].d = ul;
347        memcpy((char *)ul, b->d, sizeof(BN_ULONG) * b->top);
348        ul += b->top;
349        BN_clear_free(b);
350    }
351
352    /* I should fix this so it can still be done */
353    r->flags &= ~(RSA_FLAG_CACHE_PRIVATE | RSA_FLAG_CACHE_PUBLIC);
354
355    r->bignum_data = p;
356    return (1);
357}
358