]>
Commit | Line | Data |
---|---|---|
031e5cce SM |
1 | /* crypto/rsa/rsa_lib.c */ |
2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) | |
3 | * All rights reserved. | |
d3819813 | 4 | * |
031e5cce SM |
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.] | |
d3819813 MTL |
57 | */ |
58 | ||
59 | #include <stdio.h> | |
60 | #include <openssl/crypto.h> | |
031e5cce | 61 | #include "cryptlib.h" |
d3819813 | 62 | #include <openssl/lhash.h> |
031e5cce SM |
63 | #include <openssl/bn.h> |
64 | #include <openssl/rsa.h> | |
d3819813 | 65 | #include <openssl/rand.h> |
031e5cce SM |
66 | #ifndef OPENSSL_NO_ENGINE |
67 | # include <openssl/engine.h> | |
68 | #endif | |
d3819813 MTL |
69 | |
70 | int RSA_size(const RSA *r) | |
71 | { | |
72 | return (BN_num_bytes(r->n)); | |
73 | } | |
74 | ||
75 | int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to, | |
76 | RSA *rsa, int padding) | |
77 | { | |
031e5cce SM |
78 | #ifdef OPENSSL_FIPS |
79 | if (FIPS_mode() && !(rsa->meth->flags & RSA_FLAG_FIPS_METHOD) | |
80 | && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)) { | |
81 | RSAerr(RSA_F_RSA_PUBLIC_ENCRYPT, RSA_R_NON_FIPS_RSA_METHOD); | |
82 | return -1; | |
83 | } | |
84 | #endif | |
d3819813 MTL |
85 | return (rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding)); |
86 | } | |
87 | ||
88 | int RSA_private_encrypt(int flen, const unsigned char *from, | |
89 | unsigned char *to, RSA *rsa, int padding) | |
90 | { | |
031e5cce SM |
91 | #ifdef OPENSSL_FIPS |
92 | if (FIPS_mode() && !(rsa->meth->flags & RSA_FLAG_FIPS_METHOD) | |
93 | && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)) { | |
94 | RSAerr(RSA_F_RSA_PRIVATE_ENCRYPT, RSA_R_NON_FIPS_RSA_METHOD); | |
95 | return -1; | |
96 | } | |
97 | #endif | |
d3819813 MTL |
98 | return (rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding)); |
99 | } | |
100 | ||
101 | int RSA_private_decrypt(int flen, const unsigned char *from, | |
102 | unsigned char *to, RSA *rsa, int padding) | |
103 | { | |
031e5cce SM |
104 | #ifdef OPENSSL_FIPS |
105 | if (FIPS_mode() && !(rsa->meth->flags & RSA_FLAG_FIPS_METHOD) | |
106 | && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)) { | |
107 | RSAerr(RSA_F_RSA_PRIVATE_DECRYPT, RSA_R_NON_FIPS_RSA_METHOD); | |
108 | return -1; | |
109 | } | |
110 | #endif | |
d3819813 MTL |
111 | return (rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding)); |
112 | } | |
113 | ||
114 | int RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to, | |
115 | RSA *rsa, int padding) | |
116 | { | |
031e5cce SM |
117 | #ifdef OPENSSL_FIPS |
118 | if (FIPS_mode() && !(rsa->meth->flags & RSA_FLAG_FIPS_METHOD) | |
119 | && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)) { | |
120 | RSAerr(RSA_F_RSA_PUBLIC_DECRYPT, RSA_R_NON_FIPS_RSA_METHOD); | |
121 | return -1; | |
122 | } | |
123 | #endif | |
d3819813 MTL |
124 | return (rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding)); |
125 | } | |
126 | ||
127 | int RSA_flags(const RSA *r) | |
128 | { | |
129 | return ((r == NULL) ? 0 : r->meth->flags); | |
130 | } | |
131 | ||
132 | void RSA_blinding_off(RSA *rsa) | |
133 | { | |
031e5cce SM |
134 | if (rsa->blinding != NULL) { |
135 | BN_BLINDING_free(rsa->blinding); | |
136 | rsa->blinding = NULL; | |
137 | } | |
d3819813 MTL |
138 | rsa->flags &= ~RSA_FLAG_BLINDING; |
139 | rsa->flags |= RSA_FLAG_NO_BLINDING; | |
140 | } | |
141 | ||
142 | int RSA_blinding_on(RSA *rsa, BN_CTX *ctx) | |
143 | { | |
144 | int ret = 0; | |
145 | ||
146 | if (rsa->blinding != NULL) | |
147 | RSA_blinding_off(rsa); | |
148 | ||
149 | rsa->blinding = RSA_setup_blinding(rsa, ctx); | |
150 | if (rsa->blinding == NULL) | |
151 | goto err; | |
152 | ||
153 | rsa->flags |= RSA_FLAG_BLINDING; | |
154 | rsa->flags &= ~RSA_FLAG_NO_BLINDING; | |
155 | ret = 1; | |
156 | err: | |
157 | return (ret); | |
158 | } | |
159 | ||
160 | static BIGNUM *rsa_get_public_exp(const BIGNUM *d, const BIGNUM *p, | |
161 | const BIGNUM *q, BN_CTX *ctx) | |
162 | { | |
163 | BIGNUM *ret = NULL, *r0, *r1, *r2; | |
164 | ||
165 | if (d == NULL || p == NULL || q == NULL) | |
166 | return NULL; | |
167 | ||
168 | BN_CTX_start(ctx); | |
169 | r0 = BN_CTX_get(ctx); | |
170 | r1 = BN_CTX_get(ctx); | |
171 | r2 = BN_CTX_get(ctx); | |
172 | if (r2 == NULL) | |
173 | goto err; | |
174 | ||
175 | if (!BN_sub(r1, p, BN_value_one())) | |
176 | goto err; | |
177 | if (!BN_sub(r2, q, BN_value_one())) | |
178 | goto err; | |
179 | if (!BN_mul(r0, r1, r2, ctx)) | |
180 | goto err; | |
181 | ||
182 | ret = BN_mod_inverse(NULL, d, r0, ctx); | |
183 | err: | |
184 | BN_CTX_end(ctx); | |
185 | return ret; | |
186 | } | |
187 | ||
188 | BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx) | |
189 | { | |
031e5cce SM |
190 | BIGNUM local_n; |
191 | BIGNUM *e, *n; | |
d3819813 MTL |
192 | BN_CTX *ctx; |
193 | BN_BLINDING *ret = NULL; | |
194 | ||
195 | if (in_ctx == NULL) { | |
196 | if ((ctx = BN_CTX_new()) == NULL) | |
197 | return 0; | |
198 | } else | |
199 | ctx = in_ctx; | |
200 | ||
201 | BN_CTX_start(ctx); | |
202 | e = BN_CTX_get(ctx); | |
203 | if (e == NULL) { | |
204 | RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE); | |
205 | goto err; | |
206 | } | |
207 | ||
208 | if (rsa->e == NULL) { | |
209 | e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx); | |
210 | if (e == NULL) { | |
211 | RSAerr(RSA_F_RSA_SETUP_BLINDING, RSA_R_NO_PUBLIC_EXPONENT); | |
212 | goto err; | |
213 | } | |
214 | } else | |
215 | e = rsa->e; | |
216 | ||
031e5cce | 217 | if ((RAND_status() == 0) && rsa->d != NULL && rsa->d->d != NULL) { |
d3819813 MTL |
218 | /* |
219 | * if PRNG is not properly seeded, resort to secret exponent as | |
220 | * unpredictable seed | |
221 | */ | |
031e5cce | 222 | RAND_add(rsa->d->d, rsa->d->dmax * sizeof rsa->d->d[0], 0.0); |
d3819813 MTL |
223 | } |
224 | ||
031e5cce SM |
225 | if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) { |
226 | /* Set BN_FLG_CONSTTIME flag */ | |
227 | n = &local_n; | |
d3819813 | 228 | BN_with_flags(n, rsa->n, BN_FLG_CONSTTIME); |
031e5cce SM |
229 | } else |
230 | n = rsa->n; | |
d3819813 | 231 | |
031e5cce SM |
232 | ret = BN_BLINDING_create_param(NULL, e, n, ctx, |
233 | rsa->meth->bn_mod_exp, rsa->_method_mod_n); | |
d3819813 MTL |
234 | if (ret == NULL) { |
235 | RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_BN_LIB); | |
236 | goto err; | |
237 | } | |
031e5cce | 238 | CRYPTO_THREADID_current(BN_BLINDING_thread_id(ret)); |
d3819813 MTL |
239 | err: |
240 | BN_CTX_end(ctx); | |
031e5cce | 241 | if (in_ctx == NULL) |
d3819813 | 242 | BN_CTX_free(ctx); |
031e5cce | 243 | if (rsa->e == NULL) |
d3819813 MTL |
244 | BN_free(e); |
245 | ||
246 | return ret; | |
247 | } |