1 /* crypto/rsa/rsa_lib.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
60 #include <openssl/crypto.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>
70 const char RSA_version[]="RSA" OPENSSL_VERSION_PTEXT;
72 static const RSA_METHOD *default_RSA_meth=NULL;
76 RSA *r=RSA_new_method(NULL);
81 void RSA_set_default_method(const RSA_METHOD *meth)
83 default_RSA_meth = meth;
86 const RSA_METHOD *RSA_get_default_method(void)
88 if (default_RSA_meth == NULL)
91 default_RSA_meth=RSA_null_method();
93 #if 0 /* was: #ifdef RSAref */
94 default_RSA_meth=RSA_PKCS1_RSAref();
96 default_RSA_meth=RSA_PKCS1_SSLeay();
101 return default_RSA_meth;
104 const RSA_METHOD *RSA_get_method(const RSA *rsa)
109 int RSA_set_method(RSA *rsa, const RSA_METHOD *meth)
111 /* NB: The caller is specifically setting a method, so it's not up to us
112 * to deal with which ENGINE it comes from. */
113 const RSA_METHOD *mtmp;
115 if (mtmp->finish) mtmp->finish(rsa);
116 #ifndef OPENSSL_NO_ENGINE
119 ENGINE_finish(rsa->engine);
124 if (meth->init) meth->init(rsa);
128 RSA *RSA_new_method(ENGINE *engine)
132 ret=(RSA *)OPENSSL_malloc(sizeof(RSA));
135 RSAerr(RSA_F_RSA_NEW_METHOD,ERR_R_MALLOC_FAILURE);
139 ret->meth = RSA_get_default_method();
140 #ifndef OPENSSL_NO_ENGINE
143 if (!ENGINE_init(engine))
145 RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB);
149 ret->engine = engine;
152 ret->engine = ENGINE_get_default_RSA();
155 ret->meth = ENGINE_get_RSA(ret->engine);
158 RSAerr(RSA_F_RSA_NEW_METHOD,
160 ENGINE_finish(ret->engine);
178 ret->_method_mod_n=NULL;
179 ret->_method_mod_p=NULL;
180 ret->_method_mod_q=NULL;
182 ret->mt_blinding=NULL;
183 ret->bignum_data=NULL;
184 ret->flags=ret->meth->flags;
185 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data);
186 if ((ret->meth->init != NULL) && !ret->meth->init(ret))
188 #ifndef OPENSSL_NO_ENGINE
190 ENGINE_finish(ret->engine);
192 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data);
199 void RSA_free(RSA *r)
203 if (r == NULL) return;
205 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_RSA);
213 fprintf(stderr,"RSA_free, bad reference count\n");
220 #ifndef OPENSSL_NO_ENGINE
222 ENGINE_finish(r->engine);
225 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, r, &r->ex_data);
227 if (r->n != NULL) BN_clear_free(r->n);
228 if (r->e != NULL) BN_clear_free(r->e);
229 if (r->d != NULL) BN_clear_free(r->d);
230 if (r->p != NULL) BN_clear_free(r->p);
231 if (r->q != NULL) BN_clear_free(r->q);
232 if (r->dmp1 != NULL) BN_clear_free(r->dmp1);
233 if (r->dmq1 != NULL) BN_clear_free(r->dmq1);
234 if (r->iqmp != NULL) BN_clear_free(r->iqmp);
235 if (r->blinding != NULL) BN_BLINDING_free(r->blinding);
236 if (r->mt_blinding != NULL) BN_BLINDING_free(r->mt_blinding);
237 if (r->bignum_data != NULL) OPENSSL_free_locked(r->bignum_data);
241 int RSA_up_ref(RSA *r)
243 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_RSA);
250 fprintf(stderr, "RSA_up_ref, bad reference count\n");
254 return ((i > 1) ? 1 : 0);
257 int RSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
258 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
260 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_RSA, argl, argp,
261 new_func, dup_func, free_func);
264 int RSA_set_ex_data(RSA *r, int idx, void *arg)
266 return(CRYPTO_set_ex_data(&r->ex_data,idx,arg));
269 void *RSA_get_ex_data(const RSA *r, int idx)
271 return(CRYPTO_get_ex_data(&r->ex_data,idx));
274 int RSA_size(const RSA *r)
276 return(BN_num_bytes(r->n));
279 int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to,
280 RSA *rsa, int padding)
282 return(rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding));
285 int RSA_private_encrypt(int flen, const unsigned char *from, unsigned char *to,
286 RSA *rsa, int padding)
288 return(rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding));
291 int RSA_private_decrypt(int flen, const unsigned char *from, unsigned char *to,
292 RSA *rsa, int padding)
294 return(rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding));
297 int RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to,
298 RSA *rsa, int padding)
300 return(rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding));
303 int RSA_flags(const RSA *r)
305 return((r == NULL)?0:r->meth->flags);
308 void RSA_blinding_off(RSA *rsa)
310 if (rsa->blinding != NULL)
312 BN_BLINDING_free(rsa->blinding);
315 rsa->flags &= ~RSA_FLAG_BLINDING;
316 rsa->flags |= RSA_FLAG_NO_BLINDING;
319 int RSA_blinding_on(RSA *rsa, BN_CTX *ctx)
323 if (rsa->blinding != NULL)
324 RSA_blinding_off(rsa);
326 rsa->blinding = RSA_setup_blinding(rsa, ctx);
327 if (rsa->blinding == NULL)
330 rsa->flags |= RSA_FLAG_BLINDING;
331 rsa->flags &= ~RSA_FLAG_NO_BLINDING;
337 static BIGNUM *rsa_get_public_exp(const BIGNUM *d, const BIGNUM *p,
338 const BIGNUM *q, BN_CTX *ctx)
340 BIGNUM *ret = NULL, *r0, *r1, *r2;
342 if (d == NULL || p == NULL || q == NULL)
346 r0 = BN_CTX_get(ctx);
347 r1 = BN_CTX_get(ctx);
348 r2 = BN_CTX_get(ctx);
352 if (!BN_sub(r1, p, BN_value_one())) goto err;
353 if (!BN_sub(r2, q, BN_value_one())) goto err;
354 if (!BN_mul(r0, r1, r2, ctx)) goto err;
356 ret = BN_mod_inverse(NULL, d, r0, ctx);
362 BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx)
367 BN_BLINDING *ret = NULL;
371 if ((ctx = BN_CTX_new()) == NULL) return 0;
380 RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE);
386 e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx);
389 RSAerr(RSA_F_RSA_SETUP_BLINDING, RSA_R_NO_PUBLIC_EXPONENT);
397 if ((RAND_status() == 0) && rsa->d != NULL && rsa->d->d != NULL)
399 /* if PRNG is not properly seeded, resort to secret
400 * exponent as unpredictable seed */
401 RAND_add(rsa->d->d, rsa->d->dmax * sizeof rsa->d->d[0], 0.0);
404 if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
406 /* Set BN_FLG_CONSTTIME flag */
408 BN_with_flags(n, rsa->n, BN_FLG_CONSTTIME);
413 ret = BN_BLINDING_create_param(NULL, e, n, ctx,
414 rsa->meth->bn_mod_exp, rsa->_method_mod_n);
417 RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_BN_LIB);
420 CRYPTO_THREADID_current(BN_BLINDING_thread_id(ret));
431 int RSA_memory_lock(RSA *r)
435 BIGNUM *bn,**t[6],*b;
438 if (r->d == NULL) return(1);
446 off=k/sizeof(BN_ULONG)+1;
450 if ((p=OPENSSL_malloc_locked((off+j)*sizeof(BN_ULONG))) == NULL)
452 RSAerr(RSA_F_RSA_MEMORY_LOCK,ERR_R_MALLOC_FAILURE);
456 ul=(BN_ULONG *)&(p[off]);
461 memcpy((char *)&(bn[i]),(char *)b,sizeof(BIGNUM));
462 bn[i].flags=BN_FLG_STATIC_DATA;
464 memcpy((char *)ul,b->d,sizeof(BN_ULONG)*b->top);
469 /* I should fix this so it can still be done */
470 r->flags&= ~(RSA_FLAG_CACHE_PRIVATE|RSA_FLAG_CACHE_PUBLIC);