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diff --git a/src/lib/libcrypto/rsa/rsa_lib.c b/src/lib/libcrypto/rsa/rsa_lib.c
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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
70int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to,
71 RSA *rsa, int padding)
72 {
73 return(rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding));
74 }
75
76int RSA_private_encrypt(int flen, const unsigned char *from, unsigned char *to,
77 RSA *rsa, int padding)
78 {
79#ifdef OPENSSL_FIPS
80 if(FIPS_mode() && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW))
81 {
82 RSAerr(RSA_F_RSA_PRIVATE_ENCRYPT, RSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE);
83 return 0;
84 }
85#endif
86 return(rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding));
87 }
88
89int RSA_private_decrypt(int flen, const unsigned char *from, unsigned char *to,
90 RSA *rsa, int padding)
91 {
92 return(rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding));
93 }
94
95int RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to,
96 RSA *rsa, int padding)
97 {
98#ifdef OPENSSL_FIPS
99 if(FIPS_mode() && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW))
100 {
101 RSAerr(RSA_F_RSA_PUBLIC_DECRYPT, RSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE);
102 return 0;
103 }
104#endif
105 return(rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding));
106 }
107
108int RSA_size(const RSA *r)
109 {
110 return(BN_num_bytes(r->n));
111 }
112
113void RSA_blinding_off(RSA *rsa)
114 {
115 if (rsa->blinding != NULL)
116 {
117 BN_BLINDING_free(rsa->blinding);
118 rsa->blinding=NULL;
119 }
120 rsa->flags &= ~RSA_FLAG_BLINDING;
121 rsa->flags |= RSA_FLAG_NO_BLINDING;
122 }
123
124int RSA_blinding_on(RSA *rsa, BN_CTX *ctx)
125 {
126 int ret=0;
127
128 if (rsa->blinding != NULL)
129 RSA_blinding_off(rsa);
130
131 rsa->blinding = RSA_setup_blinding(rsa, ctx);
132 if (rsa->blinding == NULL)
133 goto err;
134
135 rsa->flags |= RSA_FLAG_BLINDING;
136 rsa->flags &= ~RSA_FLAG_NO_BLINDING;
137 ret=1;
138err:
139 return(ret);
140 }
141
142static BIGNUM *rsa_get_public_exp(const BIGNUM *d, const BIGNUM *p,
143 const BIGNUM *q, BN_CTX *ctx)
144{
145 BIGNUM *ret = NULL, *r0, *r1, *r2;
146
147 if (d == NULL || p == NULL || q == NULL)
148 return NULL;
149
150 BN_CTX_start(ctx);
151 r0 = BN_CTX_get(ctx);
152 r1 = BN_CTX_get(ctx);
153 r2 = BN_CTX_get(ctx);
154 if (r2 == NULL)
155 goto err;
156
157 if (!BN_sub(r1, p, BN_value_one())) goto err;
158 if (!BN_sub(r2, q, BN_value_one())) goto err;
159 if (!BN_mul(r0, r1, r2, ctx)) goto err;
160
161 ret = BN_mod_inverse(NULL, d, r0, ctx);
162err:
163 BN_CTX_end(ctx);
164 return ret;
165}
166
167BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx)
168{
169 BIGNUM local_n;
170 BIGNUM *e,*n;
171 BN_CTX *ctx;
172 BN_BLINDING *ret = NULL;
173
174 if (in_ctx == NULL)
175 {
176 if ((ctx = BN_CTX_new()) == NULL) return 0;
177 }
178 else
179 ctx = in_ctx;
180
181 BN_CTX_start(ctx);
182 e = BN_CTX_get(ctx);
183 if (e == NULL)
184 {
185 RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE);
186 goto err;
187 }
188
189 if (rsa->e == NULL)
190 {
191 e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx);
192 if (e == NULL)
193 {
194 RSAerr(RSA_F_RSA_SETUP_BLINDING, RSA_R_NO_PUBLIC_EXPONENT);
195 goto err;
196 }
197 }
198 else
199 e = rsa->e;
200
201
202 if ((RAND_status() == 0) && rsa->d != NULL && rsa->d->d != NULL)
203 {
204 /* if PRNG is not properly seeded, resort to secret
205 * exponent as unpredictable seed */
206 RAND_add(rsa->d->d, rsa->d->dmax * sizeof rsa->d->d[0], 0.0);
207 }
208
209 if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
210 {
211 /* Set BN_FLG_CONSTTIME flag */
212 n = &local_n;
213 BN_with_flags(n, rsa->n, BN_FLG_CONSTTIME);
214 }
215 else
216 n = rsa->n;
217
218 ret = BN_BLINDING_create_param(NULL, e, n, ctx,
219 rsa->meth->bn_mod_exp, rsa->_method_mod_n);
220 if (ret == NULL)
221 {
222 RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_BN_LIB);
223 goto err;
224 }
225 BN_BLINDING_set_thread_id(ret, CRYPTO_thread_id());
226err:
227 BN_CTX_end(ctx);
228 if (in_ctx == NULL)
229 BN_CTX_free(ctx);
230 if(rsa->e == NULL)
231 BN_free(e);
232
233 return ret;
234}
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