rsa_lib.c revision 296341 
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#ifdef OPENSSL_FIPS
94        if (FIPS_mode())
95            return FIPS_rsa_pkcs1_ssleay();
96        else
97            return RSA_PKCS1_SSLeay();
98#else
99# ifdef RSA_NULL
100        default_RSA_meth = RSA_null_method();
101# else
102        default_RSA_meth = RSA_PKCS1_SSLeay();
103# endif
104#endif
105    }
106
107    return default_RSA_meth;
108}
109
110const RSA_METHOD *RSA_get_method(const RSA *rsa)
111{
112    return rsa->meth;
113}
114
115int RSA_set_method(RSA *rsa, const RSA_METHOD *meth)
116{
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     */
121    const RSA_METHOD *mtmp;
122    mtmp = rsa->meth;
123    if (mtmp->finish)
124        mtmp->finish(rsa);
125#ifndef OPENSSL_NO_ENGINE
126    if (rsa->engine) {
127        ENGINE_finish(rsa->engine);
128        rsa->engine = NULL;
129    }
130#endif
131    rsa->meth = meth;
132    if (meth->init)
133        meth->init(rsa);
134    return 1;
135}
136
137RSA *RSA_new_method(ENGINE *engine)
138{
139    RSA *ret;
140
141    ret = (RSA *)OPENSSL_malloc(sizeof(RSA));
142    if (ret == NULL) {
143        RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
144        return NULL;
145    }
146
147    ret->meth = RSA_get_default_method();
148#ifndef OPENSSL_NO_ENGINE
149    if (engine) {
150        if (!ENGINE_init(engine)) {
151            RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB);
152            OPENSSL_free(ret);
153            return NULL;
154        }
155        ret->engine = engine;
156    } else
157        ret->engine = ENGINE_get_default_RSA();
158    if (ret->engine) {
159        ret->meth = ENGINE_get_RSA(ret->engine);
160        if (!ret->meth) {
161            RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB);
162            ENGINE_finish(ret->engine);
163            OPENSSL_free(ret);
164            return NULL;
165        }
166    }
167#endif
168
169    ret->pad = 0;
170    ret->version = 0;
171    ret->n = NULL;
172    ret->e = NULL;
173    ret->d = NULL;
174    ret->p = NULL;
175    ret->q = NULL;
176    ret->dmp1 = NULL;
177    ret->dmq1 = NULL;
178    ret->iqmp = NULL;
179    ret->references = 1;
180    ret->_method_mod_n = NULL;
181    ret->_method_mod_p = NULL;
182    ret->_method_mod_q = NULL;
183    ret->blinding = NULL;
184    ret->mt_blinding = NULL;
185    ret->bignum_data = NULL;
186    ret->flags = ret->meth->flags & ~RSA_FLAG_NON_FIPS_ALLOW;
187    if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data)) {
188#ifndef OPENSSL_NO_ENGINE
189        if (ret->engine)
190            ENGINE_finish(ret->engine);
191#endif
192        OPENSSL_free(ret);
193        return (NULL);
194    }
195
196    if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
197#ifndef OPENSSL_NO_ENGINE
198        if (ret->engine)
199            ENGINE_finish(ret->engine);
200#endif
201        CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data);
202        OPENSSL_free(ret);
203        ret = NULL;
204    }
205    return (ret);
206}
207
208void RSA_free(RSA *r)
209{
210    int i;
211
212    if (r == NULL)
213        return;
214
215    i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_RSA);
216#ifdef REF_PRINT
217    REF_PRINT("RSA", r);
218#endif
219    if (i > 0)
220        return;
221#ifdef REF_CHECK
222    if (i < 0) {
223        fprintf(stderr, "RSA_free, bad reference count\n");
224        abort();
225    }
226#endif
227
228    if (r->meth->finish)
229        r->meth->finish(r);
230#ifndef OPENSSL_NO_ENGINE
231    if (r->engine)
232        ENGINE_finish(r->engine);
233#endif
234
235    CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, r, &r->ex_data);
236
237    if (r->n != NULL)
238        BN_clear_free(r->n);
239    if (r->e != NULL)
240        BN_clear_free(r->e);
241    if (r->d != NULL)
242        BN_clear_free(r->d);
243    if (r->p != NULL)
244        BN_clear_free(r->p);
245    if (r->q != NULL)
246        BN_clear_free(r->q);
247    if (r->dmp1 != NULL)
248        BN_clear_free(r->dmp1);
249    if (r->dmq1 != NULL)
250        BN_clear_free(r->dmq1);
251    if (r->iqmp != NULL)
252        BN_clear_free(r->iqmp);
253    if (r->blinding != NULL)
254        BN_BLINDING_free(r->blinding);
255    if (r->mt_blinding != NULL)
256        BN_BLINDING_free(r->mt_blinding);
257    if (r->bignum_data != NULL)
258        OPENSSL_free_locked(r->bignum_data);
259    OPENSSL_free(r);
260}
261
262int RSA_up_ref(RSA *r)
263{
264    int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_RSA);
265#ifdef REF_PRINT
266    REF_PRINT("RSA", r);
267#endif
268#ifdef REF_CHECK
269    if (i < 2) {
270        fprintf(stderr, "RSA_up_ref, bad reference count\n");
271        abort();
272    }
273#endif
274    return ((i > 1) ? 1 : 0);
275}
276
277int RSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
278                         CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
279{
280    return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_RSA, argl, argp,
281                                   new_func, dup_func, free_func);
282}
283
284int RSA_set_ex_data(RSA *r, int idx, void *arg)
285{
286    return (CRYPTO_set_ex_data(&r->ex_data, idx, arg));
287}
288
289void *RSA_get_ex_data(const RSA *r, int idx)
290{
291    return (CRYPTO_get_ex_data(&r->ex_data, idx));
292}
293
294int RSA_memory_lock(RSA *r)
295{
296    int i, j, k, off;
297    char *p;
298    BIGNUM *bn, **t[6], *b;
299    BN_ULONG *ul;
300
301    if (r->d == NULL)
302        return (1);
303    t[0] = &r->d;
304    t[1] = &r->p;
305    t[2] = &r->q;
306    t[3] = &r->dmp1;
307    t[4] = &r->dmq1;
308    t[5] = &r->iqmp;
309    k = sizeof(BIGNUM) * 6;
310    off = k / sizeof(BN_ULONG) + 1;
311    j = 1;
312    for (i = 0; i < 6; i++)
313        j += (*t[i])->top;
314    if ((p = OPENSSL_malloc_locked((off + j) * sizeof(BN_ULONG))) == NULL) {
315        RSAerr(RSA_F_RSA_MEMORY_LOCK, ERR_R_MALLOC_FAILURE);
316        return (0);
317    }
318    bn = (BIGNUM *)p;
319    ul = (BN_ULONG *)&(p[off]);
320    for (i = 0; i < 6; i++) {
321        b = *(t[i]);
322        *(t[i]) = &(bn[i]);
323        memcpy((char *)&(bn[i]), (char *)b, sizeof(BIGNUM));
324        bn[i].flags = BN_FLG_STATIC_DATA;
325        bn[i].d = ul;
326        memcpy((char *)ul, b->d, sizeof(BN_ULONG) * b->top);
327        ul += b->top;
328        BN_clear_free(b);
329    }
330
331    /* I should fix this so it can still be done */
332    r->flags &= ~(RSA_FLAG_CACHE_PRIVATE | RSA_FLAG_CACHE_PUBLIC);
333
334    r->bignum_data = p;
335    return (1);
336}
337