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 "internal/bn_int.h"
64 #include <openssl/rsa.h>
65 #include <openssl/rand.h>
67 int RSA_size(const RSA *r)
69 return (BN_num_bytes(r->n));
72 int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to,
73 RSA *rsa, int padding)
75 return (rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding));
78 int RSA_private_encrypt(int flen, const unsigned char *from,
79 unsigned char *to, RSA *rsa, int padding)
81 return (rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding));
84 int RSA_private_decrypt(int flen, const unsigned char *from,
85 unsigned char *to, RSA *rsa, int padding)
87 return (rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding));
90 int RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to,
91 RSA *rsa, int padding)
93 return (rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding));
96 int RSA_flags(const RSA *r)
98 return ((r == NULL) ? 0 : r->meth->flags);
101 void RSA_blinding_off(RSA *rsa)
103 BN_BLINDING_free(rsa->blinding);
104 rsa->blinding = NULL;
105 rsa->flags &= ~RSA_FLAG_BLINDING;
106 rsa->flags |= RSA_FLAG_NO_BLINDING;
109 int RSA_blinding_on(RSA *rsa, BN_CTX *ctx)
113 if (rsa->blinding != NULL)
114 RSA_blinding_off(rsa);
116 rsa->blinding = RSA_setup_blinding(rsa, ctx);
117 if (rsa->blinding == NULL)
120 rsa->flags |= RSA_FLAG_BLINDING;
121 rsa->flags &= ~RSA_FLAG_NO_BLINDING;
127 static BIGNUM *rsa_get_public_exp(const BIGNUM *d, const BIGNUM *p,
128 const BIGNUM *q, BN_CTX *ctx)
130 BIGNUM *ret = NULL, *r0, *r1, *r2;
132 if (d == NULL || p == NULL || q == NULL)
136 r0 = BN_CTX_get(ctx);
137 r1 = BN_CTX_get(ctx);
138 r2 = BN_CTX_get(ctx);
142 if (!BN_sub(r1, p, BN_value_one()))
144 if (!BN_sub(r2, q, BN_value_one()))
146 if (!BN_mul(r0, r1, r2, ctx))
149 ret = BN_mod_inverse(NULL, d, r0, ctx);
155 BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx)
157 BIGNUM *local_n = NULL;
160 BN_BLINDING *ret = NULL;
162 if (in_ctx == NULL) {
163 if ((ctx = BN_CTX_new()) == NULL)
171 RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE);
175 if (rsa->e == NULL) {
176 e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx);
178 RSAerr(RSA_F_RSA_SETUP_BLINDING, RSA_R_NO_PUBLIC_EXPONENT);
184 if ((RAND_status() == 0) && rsa->d != NULL
185 && bn_get_words(rsa->d) != NULL) {
187 * if PRNG is not properly seeded, resort to secret exponent as
190 RAND_add(bn_get_words(rsa->d), bn_get_dmax(rsa->d) * sizeof(BN_ULONG),
194 if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) {
195 /* Set BN_FLG_CONSTTIME flag */
196 local_n = n = BN_new();
198 RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE);
201 BN_with_flags(n, rsa->n, BN_FLG_CONSTTIME);
205 ret = BN_BLINDING_create_param(NULL, e, n, ctx,
206 rsa->meth->bn_mod_exp, rsa->_method_mod_n);
208 RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_BN_LIB);
211 CRYPTO_THREADID_current(BN_BLINDING_thread_id(ret));