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.]
61 #include <openssl/crypto.h>
63 #include <openssl/lhash.h>
64 #include <openssl/bn.h>
65 #include <openssl/rsa.h>
66 #include <openssl/rand.h>
67 #ifndef OPENSSL_NO_ENGINE
68 #include <openssl/engine.h>
71 const char *RSA_version="RSA" OPENSSL_VERSION_PTEXT;
73 static const RSA_METHOD *default_RSA_meth=NULL;
77 RSA *r=RSA_new_method(NULL);
79 #ifndef OPENSSL_NO_FORCE_RSA_BLINDING
80 r->flags|=RSA_FLAG_BLINDING;
85 void RSA_set_default_method(const RSA_METHOD *meth)
87 default_RSA_meth = meth;
90 const RSA_METHOD *RSA_get_default_method(void)
92 if (default_RSA_meth == NULL)
95 default_RSA_meth=RSA_null_method();
97 #if 0 /* was: #ifdef RSAref */
98 default_RSA_meth=RSA_PKCS1_RSAref();
100 default_RSA_meth=RSA_PKCS1_SSLeay();
105 return default_RSA_meth;
108 const RSA_METHOD *RSA_get_method(const RSA *rsa)
113 int RSA_set_method(RSA *rsa, const RSA_METHOD *meth)
115 /* NB: The caller is specifically setting a method, so it's not up to us
116 * to deal with which ENGINE it comes from. */
117 const RSA_METHOD *mtmp;
119 if (mtmp->finish) mtmp->finish(rsa);
120 #ifndef OPENSSL_NO_ENGINE
123 ENGINE_finish(rsa->engine);
128 if (meth->init) meth->init(rsa);
132 RSA *RSA_new_method(ENGINE *engine)
136 ret=(RSA *)OPENSSL_malloc(sizeof(RSA));
139 RSAerr(RSA_F_RSA_NEW_METHOD,ERR_R_MALLOC_FAILURE);
143 ret->meth = RSA_get_default_method();
144 #ifndef OPENSSL_NO_ENGINE
147 if (!ENGINE_init(engine))
149 RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB);
153 ret->engine = engine;
156 ret->engine = ENGINE_get_default_RSA();
159 ret->meth = ENGINE_get_RSA(ret->engine);
162 RSAerr(RSA_F_RSA_NEW_METHOD,
164 ENGINE_finish(ret->engine);
182 ret->_method_mod_n=NULL;
183 ret->_method_mod_p=NULL;
184 ret->_method_mod_q=NULL;
186 ret->mt_blinding=NULL;
187 ret->bignum_data=NULL;
188 ret->flags=ret->meth->flags;
189 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data);
190 if ((ret->meth->init != NULL) && !ret->meth->init(ret))
192 #ifndef OPENSSL_NO_ENGINE
194 ENGINE_finish(ret->engine);
196 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data);
203 void RSA_free(RSA *r)
207 if (r == NULL) return;
209 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_RSA);
217 fprintf(stderr,"RSA_free, bad reference count\n");
224 #ifndef OPENSSL_NO_ENGINE
226 ENGINE_finish(r->engine);
229 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, r, &r->ex_data);
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->mt_blinding != NULL) BN_BLINDING_free(r->mt_blinding);
241 if (r->bignum_data != NULL) OPENSSL_free_locked(r->bignum_data);
245 int RSA_up_ref(RSA *r)
247 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_RSA);
254 fprintf(stderr, "RSA_up_ref, bad reference count\n");
258 return ((i > 1) ? 1 : 0);
261 int RSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
262 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
264 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_RSA, argl, argp,
265 new_func, dup_func, free_func);
268 int RSA_set_ex_data(RSA *r, int idx, void *arg)
270 return(CRYPTO_set_ex_data(&r->ex_data,idx,arg));
273 void *RSA_get_ex_data(const RSA *r, int idx)
275 return(CRYPTO_get_ex_data(&r->ex_data,idx));
278 int RSA_size(const RSA *r)
280 return(BN_num_bytes(r->n));
283 int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to,
284 RSA *rsa, int padding)
286 return(rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding));
289 int RSA_private_encrypt(int flen, const unsigned char *from, unsigned char *to,
290 RSA *rsa, int padding)
292 return(rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding));
295 int RSA_private_decrypt(int flen, const unsigned char *from, unsigned char *to,
296 RSA *rsa, int padding)
298 return(rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding));
301 int RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to,
302 RSA *rsa, int padding)
304 return(rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding));
307 int RSA_flags(const RSA *r)
309 return((r == NULL)?0:r->meth->flags);
312 void RSA_blinding_off(RSA *rsa)
314 if (rsa->blinding != NULL)
316 BN_BLINDING_free(rsa->blinding);
319 rsa->flags &= ~RSA_FLAG_BLINDING;
320 rsa->flags |= RSA_FLAG_NO_BLINDING;
323 int RSA_blinding_on(RSA *rsa, BN_CTX *ctx)
327 if (rsa->blinding != NULL)
328 RSA_blinding_off(rsa);
330 rsa->blinding = RSA_setup_blinding(rsa, ctx);
331 if (rsa->blinding == NULL)
334 rsa->flags |= RSA_FLAG_BLINDING;
335 rsa->flags &= ~RSA_FLAG_NO_BLINDING;
341 static BIGNUM *rsa_get_public_exp(const BIGNUM *d, const BIGNUM *p,
342 const BIGNUM *q, BN_CTX *ctx)
344 BIGNUM *ret = NULL, *r0, *r1, *r2;
346 if (d == NULL || p == NULL || q == NULL)
350 r0 = BN_CTX_get(ctx);
351 r1 = BN_CTX_get(ctx);
352 r2 = BN_CTX_get(ctx);
356 if (!BN_sub(r1, p, BN_value_one())) goto err;
357 if (!BN_sub(r2, q, BN_value_one())) goto err;
358 if (!BN_mul(r0, r1, r2, ctx)) goto err;
360 ret = BN_mod_inverse(NULL, d, r0, ctx);
366 BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx)
370 BN_BLINDING *ret = NULL;
374 if ((ctx = BN_CTX_new()) == NULL) return 0;
383 RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE);
389 e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx);
392 RSAerr(RSA_F_RSA_SETUP_BLINDING, RSA_R_NO_PUBLIC_EXPONENT);
400 if ((RAND_status() == 0) && rsa->d != NULL && rsa->d->d != NULL)
402 /* if PRNG is not properly seeded, resort to secret
403 * exponent as unpredictable seed */
404 RAND_add(rsa->d->d, rsa->d->dmax * sizeof rsa->d->d[0], 0.0);
407 ret = BN_BLINDING_create_param(NULL, e, rsa->n, ctx,
408 rsa->meth->bn_mod_exp, rsa->_method_mod_n);
411 RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_BN_LIB);
414 BN_BLINDING_set_thread_id(ret, CRYPTO_thread_id());
425 int RSA_memory_lock(RSA *r)
429 BIGNUM *bn,**t[6],*b;
432 if (r->d == NULL) return(1);
440 off=k/sizeof(BN_ULONG)+1;
444 if ((p=OPENSSL_malloc_locked((off+j)*sizeof(BN_ULONG))) == NULL)
446 RSAerr(RSA_F_RSA_MEMORY_LOCK,ERR_R_MALLOC_FAILURE);
450 ul=(BN_ULONG *)&(p[off]);
455 memcpy((char *)&(bn[i]),(char *)b,sizeof(BIGNUM));
456 bn[i].flags=BN_FLG_STATIC_DATA;
458 memcpy((char *)ul,b->d,sizeof(BN_ULONG)*b->top);
463 /* I should fix this so it can still be done */
464 r->flags&= ~(RSA_FLAG_CACHE_PRIVATE|RSA_FLAG_CACHE_PUBLIC);