Branch data Line data Source code
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 : : #define OPENSSL_FIPSAPI
60 : :
61 : : #include <stdio.h>
62 : : #include <openssl/crypto.h>
63 : : #include "cryptlib.h"
64 : : #include <openssl/lhash.h>
65 : : #include <openssl/bn.h>
66 : : #include <openssl/rsa.h>
67 : : #include <openssl/rand.h>
68 : :
69 : 9961 : int RSA_size(const RSA *r)
70 : : {
71 : 9961 : return(BN_num_bytes(r->n));
72 : : }
73 : :
74 : 528 : int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to,
75 : : RSA *rsa, int padding)
76 : : {
77 : 528 : return(rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding));
78 : : }
79 : :
80 : 815 : int RSA_private_encrypt(int flen, const unsigned char *from, unsigned char *to,
81 : : RSA *rsa, int padding)
82 : : {
83 : 815 : return(rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding));
84 : : }
85 : :
86 : 123934 : int RSA_private_decrypt(int flen, const unsigned char *from, unsigned char *to,
87 : : RSA *rsa, int padding)
88 : : {
89 : 123934 : return(rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding));
90 : : }
91 : :
92 : 1653 : int RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to,
93 : : RSA *rsa, int padding)
94 : : {
95 : 1653 : return(rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding));
96 : : }
97 : :
98 : 1036 : int RSA_flags(const RSA *r)
99 : : {
100 [ + - ]: 1036 : return((r == NULL)?0:r->meth->flags);
101 : : }
102 : :
103 : 0 : void RSA_blinding_off(RSA *rsa)
104 : : {
105 [ # # ]: 0 : if (rsa->blinding != NULL)
106 : : {
107 : 0 : BN_BLINDING_free(rsa->blinding);
108 : 0 : rsa->blinding=NULL;
109 : : }
110 : 0 : rsa->flags &= ~RSA_FLAG_BLINDING;
111 : 0 : rsa->flags |= RSA_FLAG_NO_BLINDING;
112 : 0 : }
113 : :
114 : 0 : int RSA_blinding_on(RSA *rsa, BN_CTX *ctx)
115 : : {
116 : 0 : int ret=0;
117 : :
118 [ # # ]: 0 : if (rsa->blinding != NULL)
119 : 0 : RSA_blinding_off(rsa);
120 : :
121 : 0 : rsa->blinding = RSA_setup_blinding(rsa, ctx);
122 [ # # ]: 0 : if (rsa->blinding == NULL)
123 : : goto err;
124 : :
125 : 0 : rsa->flags |= RSA_FLAG_BLINDING;
126 : 0 : rsa->flags &= ~RSA_FLAG_NO_BLINDING;
127 : 0 : ret=1;
128 : : err:
129 : 0 : return(ret);
130 : : }
131 : :
132 : 0 : static BIGNUM *rsa_get_public_exp(const BIGNUM *d, const BIGNUM *p,
133 : : const BIGNUM *q, BN_CTX *ctx)
134 : : {
135 : 0 : BIGNUM *ret = NULL, *r0, *r1, *r2;
136 : :
137 [ # # ][ # # ]: 0 : if (d == NULL || p == NULL || q == NULL)
138 : : return NULL;
139 : :
140 : 0 : BN_CTX_start(ctx);
141 : 0 : r0 = BN_CTX_get(ctx);
142 : 0 : r1 = BN_CTX_get(ctx);
143 : 0 : r2 = BN_CTX_get(ctx);
144 [ # # ]: 0 : if (r2 == NULL)
145 : : goto err;
146 : :
147 [ # # ]: 0 : if (!BN_sub(r1, p, BN_value_one())) goto err;
148 [ # # ]: 0 : if (!BN_sub(r2, q, BN_value_one())) goto err;
149 [ # # ]: 0 : if (!BN_mul(r0, r1, r2, ctx)) goto err;
150 : :
151 : 0 : ret = BN_mod_inverse(NULL, d, r0, ctx);
152 : : err:
153 : 0 : BN_CTX_end(ctx);
154 : 0 : return ret;
155 : : }
156 : :
157 : 1102 : BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx)
158 : : {
159 : : BIGNUM local_n;
160 : : BIGNUM *e,*n;
161 : : BN_CTX *ctx;
162 : 1102 : BN_BLINDING *ret = NULL;
163 : :
164 [ - + ]: 1102 : if (in_ctx == NULL)
165 : : {
166 [ # # ]: 0 : if ((ctx = BN_CTX_new()) == NULL) return 0;
167 : : }
168 : : else
169 : : ctx = in_ctx;
170 : :
171 : 1102 : BN_CTX_start(ctx);
172 : 1102 : e = BN_CTX_get(ctx);
173 [ - + ]: 1102 : if (e == NULL)
174 : : {
175 : 0 : RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE);
176 : 0 : goto err;
177 : : }
178 : :
179 [ - + ]: 1102 : if (rsa->e == NULL)
180 : : {
181 : 0 : e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx);
182 [ # # ]: 0 : if (e == NULL)
183 : : {
184 : 0 : RSAerr(RSA_F_RSA_SETUP_BLINDING, RSA_R_NO_PUBLIC_EXPONENT);
185 : 0 : goto err;
186 : : }
187 : : }
188 : : else
189 : : e = rsa->e;
190 : :
191 : :
192 [ - + ][ # # ]: 1102 : if ((RAND_status() == 0) && rsa->d != NULL && rsa->d->d != NULL)
[ # # ]
193 : : {
194 : : /* if PRNG is not properly seeded, resort to secret
195 : : * exponent as unpredictable seed */
196 : 0 : RAND_add(rsa->d->d, rsa->d->dmax * sizeof rsa->d->d[0], 0.0);
197 : : }
198 : :
199 [ + + ]: 1102 : if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
200 : : {
201 : : /* Set BN_FLG_CONSTTIME flag */
202 : 1099 : n = &local_n;
203 : 1099 : BN_with_flags(n, rsa->n, BN_FLG_CONSTTIME);
204 : : }
205 : : else
206 : 3 : n = rsa->n;
207 : :
208 : 1102 : ret = BN_BLINDING_create_param(NULL, e, n, ctx,
209 : 1102 : rsa->meth->bn_mod_exp, rsa->_method_mod_n);
210 [ - + ]: 1102 : if (ret == NULL)
211 : : {
212 : 0 : RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_BN_LIB);
213 : 0 : goto err;
214 : : }
215 : 1102 : CRYPTO_THREADID_current(BN_BLINDING_thread_id(ret));
216 : : err:
217 : 1102 : BN_CTX_end(ctx);
218 [ - + ]: 1102 : if (in_ctx == NULL)
219 : 0 : BN_CTX_free(ctx);
220 [ - + ]: 1102 : if(rsa->e == NULL)
221 : 0 : BN_free(e);
222 : :
223 : 1102 : return ret;
224 : : }
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