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72a26733 DSH |
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. | |
0f113f3e | 8 | * |
72a26733 DSH |
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). | |
0f113f3e | 15 | * |
72a26733 DSH |
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. | |
0f113f3e | 22 | * |
72a26733 DSH |
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 :-). | |
0f113f3e | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
72a26733 DSH |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 40 | * |
72a26733 DSH |
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. | |
0f113f3e | 52 | * |
72a26733 DSH |
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> | |
18125f7f | 63 | #include "internal/bn_int.h" |
72a26733 DSH |
64 | #include <openssl/rsa.h> |
65 | #include <openssl/rand.h> | |
72a26733 DSH |
66 | |
67 | int RSA_size(const RSA *r) | |
0f113f3e MC |
68 | { |
69 | return (BN_num_bytes(r->n)); | |
70 | } | |
72a26733 DSH |
71 | |
72 | int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to, | |
0f113f3e MC |
73 | RSA *rsa, int padding) |
74 | { | |
75 | return (rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding)); | |
76 | } | |
77 | ||
78 | int RSA_private_encrypt(int flen, const unsigned char *from, | |
79 | unsigned char *to, RSA *rsa, int padding) | |
80 | { | |
81 | return (rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding)); | |
82 | } | |
83 | ||
84 | int RSA_private_decrypt(int flen, const unsigned char *from, | |
85 | unsigned char *to, RSA *rsa, int padding) | |
86 | { | |
87 | return (rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding)); | |
88 | } | |
72a26733 DSH |
89 | |
90 | int RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to, | |
0f113f3e MC |
91 | RSA *rsa, int padding) |
92 | { | |
93 | return (rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding)); | |
94 | } | |
72a26733 DSH |
95 | |
96 | int RSA_flags(const RSA *r) | |
0f113f3e MC |
97 | { |
98 | return ((r == NULL) ? 0 : r->meth->flags); | |
99 | } | |
72a26733 DSH |
100 | |
101 | void RSA_blinding_off(RSA *rsa) | |
0f113f3e | 102 | { |
23a1d5e9 RS |
103 | BN_BLINDING_free(rsa->blinding); |
104 | rsa->blinding = NULL; | |
0f113f3e MC |
105 | rsa->flags &= ~RSA_FLAG_BLINDING; |
106 | rsa->flags |= RSA_FLAG_NO_BLINDING; | |
107 | } | |
72a26733 DSH |
108 | |
109 | int RSA_blinding_on(RSA *rsa, BN_CTX *ctx) | |
0f113f3e MC |
110 | { |
111 | int ret = 0; | |
72a26733 | 112 | |
0f113f3e MC |
113 | if (rsa->blinding != NULL) |
114 | RSA_blinding_off(rsa); | |
72a26733 | 115 | |
0f113f3e MC |
116 | rsa->blinding = RSA_setup_blinding(rsa, ctx); |
117 | if (rsa->blinding == NULL) | |
118 | goto err; | |
72a26733 | 119 | |
0f113f3e MC |
120 | rsa->flags |= RSA_FLAG_BLINDING; |
121 | rsa->flags &= ~RSA_FLAG_NO_BLINDING; | |
122 | ret = 1; | |
123 | err: | |
124 | return (ret); | |
125 | } | |
72a26733 DSH |
126 | |
127 | static BIGNUM *rsa_get_public_exp(const BIGNUM *d, const BIGNUM *p, | |
0f113f3e | 128 | const BIGNUM *q, BN_CTX *ctx) |
72a26733 | 129 | { |
0f113f3e MC |
130 | BIGNUM *ret = NULL, *r0, *r1, *r2; |
131 | ||
132 | if (d == NULL || p == NULL || q == NULL) | |
133 | return NULL; | |
134 | ||
135 | BN_CTX_start(ctx); | |
136 | r0 = BN_CTX_get(ctx); | |
137 | r1 = BN_CTX_get(ctx); | |
138 | r2 = BN_CTX_get(ctx); | |
139 | if (r2 == NULL) | |
140 | goto err; | |
141 | ||
142 | if (!BN_sub(r1, p, BN_value_one())) | |
143 | goto err; | |
144 | if (!BN_sub(r2, q, BN_value_one())) | |
145 | goto err; | |
146 | if (!BN_mul(r0, r1, r2, ctx)) | |
147 | goto err; | |
148 | ||
149 | ret = BN_mod_inverse(NULL, d, r0, ctx); | |
150 | err: | |
151 | BN_CTX_end(ctx); | |
152 | return ret; | |
72a26733 DSH |
153 | } |
154 | ||
155 | BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx) | |
156 | { | |
0f113f3e MC |
157 | BIGNUM *local_n = NULL; |
158 | BIGNUM *e, *n; | |
159 | BN_CTX *ctx; | |
160 | BN_BLINDING *ret = NULL; | |
161 | ||
162 | if (in_ctx == NULL) { | |
163 | if ((ctx = BN_CTX_new()) == NULL) | |
164 | return 0; | |
165 | } else | |
166 | ctx = in_ctx; | |
167 | ||
168 | BN_CTX_start(ctx); | |
169 | e = BN_CTX_get(ctx); | |
170 | if (e == NULL) { | |
171 | RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE); | |
172 | goto err; | |
173 | } | |
174 | ||
175 | if (rsa->e == NULL) { | |
176 | e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx); | |
177 | if (e == NULL) { | |
178 | RSAerr(RSA_F_RSA_SETUP_BLINDING, RSA_R_NO_PUBLIC_EXPONENT); | |
179 | goto err; | |
180 | } | |
181 | } else | |
182 | e = rsa->e; | |
183 | ||
184 | if ((RAND_status() == 0) && rsa->d != NULL | |
185 | && bn_get_words(rsa->d) != NULL) { | |
186 | /* | |
187 | * if PRNG is not properly seeded, resort to secret exponent as | |
188 | * unpredictable seed | |
189 | */ | |
190 | RAND_add(bn_get_words(rsa->d), bn_get_dmax(rsa->d) * sizeof(BN_ULONG), | |
191 | 0.0); | |
192 | } | |
193 | ||
194 | if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) { | |
195 | /* Set BN_FLG_CONSTTIME flag */ | |
196 | local_n = n = BN_new(); | |
197 | if (!local_n) { | |
198 | RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE); | |
199 | goto err; | |
200 | } | |
201 | BN_with_flags(n, rsa->n, BN_FLG_CONSTTIME); | |
202 | } else | |
203 | n = rsa->n; | |
204 | ||
205 | ret = BN_BLINDING_create_param(NULL, e, n, ctx, | |
206 | rsa->meth->bn_mod_exp, rsa->_method_mod_n); | |
207 | if (ret == NULL) { | |
208 | RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_BN_LIB); | |
209 | goto err; | |
210 | } | |
211 | CRYPTO_THREADID_current(BN_BLINDING_thread_id(ret)); | |
212 | err: | |
213 | BN_CTX_end(ctx); | |
23a1d5e9 | 214 | if (ctx != in_ctx) |
0f113f3e | 215 | BN_CTX_free(ctx); |
23a1d5e9 | 216 | if (e != rsa->e) |
0f113f3e | 217 | BN_free(e); |
23a1d5e9 | 218 | BN_free(local_n); |
0f113f3e MC |
219 | |
220 | return ret; | |
72a26733 | 221 | } |