1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.]
59 #include <openssl/crypto.h>
60 #include "internal/cryptlib.h"
61 #include <openssl/lhash.h>
62 #include "internal/bn_int.h"
63 #include <openssl/rsa.h>
64 #include <openssl/rand.h>
66 int RSA_bits(const RSA *r)
68 return (BN_num_bits(r->n));
71 int RSA_size(const RSA *r)
73 return (BN_num_bytes(r->n));
76 int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to,
77 RSA *rsa, int padding)
79 return (rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding));
82 int RSA_private_encrypt(int flen, const unsigned char *from,
83 unsigned char *to, RSA *rsa, int padding)
85 return (rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding));
88 int RSA_private_decrypt(int flen, const unsigned char *from,
89 unsigned char *to, RSA *rsa, int padding)
91 return (rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding));
94 int RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to,
95 RSA *rsa, int padding)
97 return (rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding));
100 int RSA_flags(const RSA *r)
102 return ((r == NULL) ? 0 : r->meth->flags);
105 void RSA_blinding_off(RSA *rsa)
107 BN_BLINDING_free(rsa->blinding);
108 rsa->blinding = NULL;
109 rsa->flags &= ~RSA_FLAG_BLINDING;
110 rsa->flags |= RSA_FLAG_NO_BLINDING;
113 int RSA_blinding_on(RSA *rsa, BN_CTX *ctx)
117 if (rsa->blinding != NULL)
118 RSA_blinding_off(rsa);
120 rsa->blinding = RSA_setup_blinding(rsa, ctx);
121 if (rsa->blinding == NULL)
124 rsa->flags |= RSA_FLAG_BLINDING;
125 rsa->flags &= ~RSA_FLAG_NO_BLINDING;
131 static BIGNUM *rsa_get_public_exp(const BIGNUM *d, const BIGNUM *p,
132 const BIGNUM *q, BN_CTX *ctx)
134 BIGNUM *ret = NULL, *r0, *r1, *r2;
136 if (d == NULL || p == NULL || q == NULL)
140 r0 = BN_CTX_get(ctx);
141 r1 = BN_CTX_get(ctx);
142 r2 = BN_CTX_get(ctx);
146 if (!BN_sub(r1, p, BN_value_one()))
148 if (!BN_sub(r2, q, BN_value_one()))
150 if (!BN_mul(r0, r1, r2, ctx))
153 ret = BN_mod_inverse(NULL, d, r0, ctx);
159 BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx)
163 BN_BLINDING *ret = NULL;
165 if (in_ctx == NULL) {
166 if ((ctx = BN_CTX_new()) == NULL)
174 RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE);
178 if (rsa->e == NULL) {
179 e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx);
181 RSAerr(RSA_F_RSA_SETUP_BLINDING, RSA_R_NO_PUBLIC_EXPONENT);
187 if ((RAND_status() == 0) && rsa->d != NULL
188 && bn_get_words(rsa->d) != NULL) {
190 * if PRNG is not properly seeded, resort to secret exponent as
193 RAND_add(bn_get_words(rsa->d), bn_get_dmax(rsa->d) * sizeof(BN_ULONG),
198 BIGNUM *local_n = NULL, *n;
199 if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) {
200 /* Set BN_FLG_CONSTTIME flag */
201 local_n = n = BN_new();
202 if (local_n == NULL) {
203 RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE);
206 BN_with_flags(n, rsa->n, BN_FLG_CONSTTIME);
211 ret = BN_BLINDING_create_param(NULL, e, n, ctx, rsa->meth->bn_mod_exp,
213 /* We MUST free local_n before any further use of rsa->n */
217 RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_BN_LIB);
220 CRYPTO_THREADID_current(BN_BLINDING_thread_id(ret));