]>
Commit | Line | Data |
---|---|---|
72a26733 DSH |
1 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
2 | * All rights reserved. | |
3 | * | |
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. | |
0f113f3e | 7 | * |
72a26733 DSH |
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). | |
0f113f3e | 14 | * |
72a26733 DSH |
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. | |
0f113f3e | 21 | * |
72a26733 DSH |
22 | * Redistribution and use in source and binary forms, with or without |
23 | * modification, are permitted provided that the following conditions | |
24 | * are met: | |
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 :-). | |
0f113f3e | 36 | * 4. If you include any Windows specific code (or a derivative thereof) from |
72a26733 DSH |
37 | * the apps directory (application code) you must include an acknowledgement: |
38 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 39 | * |
72a26733 DSH |
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 | |
50 | * SUCH DAMAGE. | |
0f113f3e | 51 | * |
72a26733 DSH |
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.] | |
56 | */ | |
57 | ||
58 | #include <stdio.h> | |
59 | #include <openssl/crypto.h> | |
b39fc560 | 60 | #include "internal/cryptlib.h" |
72a26733 | 61 | #include <openssl/lhash.h> |
18125f7f | 62 | #include "internal/bn_int.h" |
72a26733 DSH |
63 | #include <openssl/rsa.h> |
64 | #include <openssl/rand.h> | |
72a26733 | 65 | |
26c79d56 KR |
66 | int RSA_bits(const RSA *r) |
67 | { | |
68 | return (BN_num_bits(r->n)); | |
69 | } | |
70 | ||
72a26733 | 71 | int RSA_size(const RSA *r) |
0f113f3e MC |
72 | { |
73 | return (BN_num_bytes(r->n)); | |
74 | } | |
72a26733 DSH |
75 | |
76 | int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to, | |
0f113f3e MC |
77 | RSA *rsa, int padding) |
78 | { | |
79 | return (rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding)); | |
80 | } | |
81 | ||
82 | int RSA_private_encrypt(int flen, const unsigned char *from, | |
83 | unsigned char *to, RSA *rsa, int padding) | |
84 | { | |
85 | return (rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding)); | |
86 | } | |
87 | ||
88 | int RSA_private_decrypt(int flen, const unsigned char *from, | |
89 | unsigned char *to, RSA *rsa, int padding) | |
90 | { | |
91 | return (rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding)); | |
92 | } | |
72a26733 DSH |
93 | |
94 | int RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to, | |
0f113f3e MC |
95 | RSA *rsa, int padding) |
96 | { | |
97 | return (rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding)); | |
98 | } | |
72a26733 DSH |
99 | |
100 | int RSA_flags(const RSA *r) | |
0f113f3e MC |
101 | { |
102 | return ((r == NULL) ? 0 : r->meth->flags); | |
103 | } | |
72a26733 DSH |
104 | |
105 | void RSA_blinding_off(RSA *rsa) | |
0f113f3e | 106 | { |
23a1d5e9 RS |
107 | BN_BLINDING_free(rsa->blinding); |
108 | rsa->blinding = NULL; | |
0f113f3e MC |
109 | rsa->flags &= ~RSA_FLAG_BLINDING; |
110 | rsa->flags |= RSA_FLAG_NO_BLINDING; | |
111 | } | |
72a26733 DSH |
112 | |
113 | int RSA_blinding_on(RSA *rsa, BN_CTX *ctx) | |
0f113f3e MC |
114 | { |
115 | int ret = 0; | |
72a26733 | 116 | |
0f113f3e MC |
117 | if (rsa->blinding != NULL) |
118 | RSA_blinding_off(rsa); | |
72a26733 | 119 | |
0f113f3e MC |
120 | rsa->blinding = RSA_setup_blinding(rsa, ctx); |
121 | if (rsa->blinding == NULL) | |
122 | goto err; | |
72a26733 | 123 | |
0f113f3e MC |
124 | rsa->flags |= RSA_FLAG_BLINDING; |
125 | rsa->flags &= ~RSA_FLAG_NO_BLINDING; | |
126 | ret = 1; | |
127 | err: | |
128 | return (ret); | |
129 | } | |
72a26733 DSH |
130 | |
131 | static BIGNUM *rsa_get_public_exp(const BIGNUM *d, const BIGNUM *p, | |
0f113f3e | 132 | const BIGNUM *q, BN_CTX *ctx) |
72a26733 | 133 | { |
0f113f3e MC |
134 | BIGNUM *ret = NULL, *r0, *r1, *r2; |
135 | ||
136 | if (d == NULL || p == NULL || q == NULL) | |
137 | return NULL; | |
138 | ||
139 | BN_CTX_start(ctx); | |
140 | r0 = BN_CTX_get(ctx); | |
141 | r1 = BN_CTX_get(ctx); | |
142 | r2 = BN_CTX_get(ctx); | |
143 | if (r2 == NULL) | |
144 | goto err; | |
145 | ||
146 | if (!BN_sub(r1, p, BN_value_one())) | |
147 | goto err; | |
148 | if (!BN_sub(r2, q, BN_value_one())) | |
149 | goto err; | |
150 | if (!BN_mul(r0, r1, r2, ctx)) | |
151 | goto err; | |
152 | ||
153 | ret = BN_mod_inverse(NULL, d, r0, ctx); | |
154 | err: | |
155 | BN_CTX_end(ctx); | |
156 | return ret; | |
72a26733 DSH |
157 | } |
158 | ||
159 | BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx) | |
160 | { | |
fd7d2520 | 161 | BIGNUM *e; |
0f113f3e MC |
162 | BN_CTX *ctx; |
163 | BN_BLINDING *ret = NULL; | |
164 | ||
165 | if (in_ctx == NULL) { | |
166 | if ((ctx = BN_CTX_new()) == NULL) | |
167 | return 0; | |
168 | } else | |
169 | ctx = in_ctx; | |
170 | ||
171 | BN_CTX_start(ctx); | |
172 | e = BN_CTX_get(ctx); | |
173 | if (e == NULL) { | |
174 | RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE); | |
175 | goto err; | |
176 | } | |
177 | ||
178 | if (rsa->e == NULL) { | |
179 | e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx); | |
180 | if (e == NULL) { | |
181 | RSAerr(RSA_F_RSA_SETUP_BLINDING, RSA_R_NO_PUBLIC_EXPONENT); | |
182 | goto err; | |
183 | } | |
184 | } else | |
185 | e = rsa->e; | |
186 | ||
187 | if ((RAND_status() == 0) && rsa->d != NULL | |
188 | && bn_get_words(rsa->d) != NULL) { | |
189 | /* | |
190 | * if PRNG is not properly seeded, resort to secret exponent as | |
191 | * unpredictable seed | |
192 | */ | |
193 | RAND_add(bn_get_words(rsa->d), bn_get_dmax(rsa->d) * sizeof(BN_ULONG), | |
194 | 0.0); | |
195 | } | |
196 | ||
fd7d2520 MC |
197 | { |
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); | |
204 | goto err; | |
205 | } | |
206 | BN_with_flags(n, rsa->n, BN_FLG_CONSTTIME); | |
207 | } else { | |
208 | n = rsa->n; | |
0f113f3e | 209 | } |
0f113f3e | 210 | |
fd7d2520 MC |
211 | ret = BN_BLINDING_create_param(NULL, e, n, ctx, rsa->meth->bn_mod_exp, |
212 | rsa->_method_mod_n); | |
213 | /* We MUST free local_n before any further use of rsa->n */ | |
214 | BN_free(local_n); | |
215 | } | |
0f113f3e MC |
216 | if (ret == NULL) { |
217 | RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_BN_LIB); | |
218 | goto err; | |
219 | } | |
0b1a07c8 AG |
220 | |
221 | BN_BLINDING_set_current_thread(ret); | |
222 | ||
0f113f3e MC |
223 | err: |
224 | BN_CTX_end(ctx); | |
23a1d5e9 | 225 | if (ctx != in_ctx) |
0f113f3e | 226 | BN_CTX_free(ctx); |
23a1d5e9 | 227 | if (e != rsa->e) |
0f113f3e | 228 | BN_free(e); |
0f113f3e MC |
229 | |
230 | return ret; | |
72a26733 | 231 | } |