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d02b48c6 | 1 | /* crypto/dsa/dsa_key.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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. | |
ae5c8664 | 8 | * |
d02b48c6 RE |
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). | |
ae5c8664 | 15 | * |
d02b48c6 RE |
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. | |
ae5c8664 | 22 | * |
d02b48c6 RE |
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 :-). | |
ae5c8664 | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d02b48c6 RE |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
ae5c8664 | 40 | * |
d02b48c6 RE |
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. | |
ae5c8664 | 52 | * |
d02b48c6 RE |
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 <time.h> | |
61 | #include "cryptlib.h" | |
751ff1d3 | 62 | #ifndef OPENSSL_NO_SHA |
ae5c8664 MC |
63 | # include <openssl/bn.h> |
64 | # include <openssl/dsa.h> | |
65 | # include <openssl/rand.h> | |
d02b48c6 | 66 | |
ae5c8664 MC |
67 | # ifdef OPENSSL_FIPS |
68 | # include <openssl/fips.h> | |
69 | # endif | |
ed9b0e5c | 70 | |
0e4aa0d2 GT |
71 | static int dsa_builtin_keygen(DSA *dsa); |
72 | ||
6b691a5c | 73 | int DSA_generate_key(DSA *dsa) |
ae5c8664 MC |
74 | { |
75 | # ifdef OPENSSL_FIPS | |
76 | if (FIPS_mode() && !(dsa->meth->flags & DSA_FLAG_FIPS_METHOD) | |
77 | && !(dsa->flags & DSA_FLAG_NON_FIPS_ALLOW)) { | |
78 | DSAerr(DSA_F_DSA_GENERATE_KEY, DSA_R_NON_FIPS_DSA_METHOD); | |
79 | return 0; | |
80 | } | |
81 | # endif | |
82 | if (dsa->meth->dsa_keygen) | |
83 | return dsa->meth->dsa_keygen(dsa); | |
84 | # ifdef OPENSSL_FIPS | |
85 | if (FIPS_mode()) | |
86 | return FIPS_dsa_generate_key(dsa); | |
87 | # endif | |
88 | return dsa_builtin_keygen(dsa); | |
89 | } | |
0e4aa0d2 GT |
90 | |
91 | static int dsa_builtin_keygen(DSA *dsa) | |
ae5c8664 MC |
92 | { |
93 | int ok = 0; | |
94 | BN_CTX *ctx = NULL; | |
95 | BIGNUM *pub_key = NULL, *priv_key = NULL; | |
96 | ||
97 | if ((ctx = BN_CTX_new()) == NULL) | |
98 | goto err; | |
d02b48c6 | 99 | |
ae5c8664 MC |
100 | if (dsa->priv_key == NULL) { |
101 | if ((priv_key = BN_new()) == NULL) | |
102 | goto err; | |
103 | } else | |
104 | priv_key = dsa->priv_key; | |
d02b48c6 | 105 | |
ae5c8664 MC |
106 | do |
107 | if (!BN_rand_range(priv_key, dsa->q)) | |
108 | goto err; | |
109 | while (BN_is_zero(priv_key)) ; | |
d02b48c6 | 110 | |
ae5c8664 MC |
111 | if (dsa->pub_key == NULL) { |
112 | if ((pub_key = BN_new()) == NULL) | |
113 | goto err; | |
114 | } else | |
115 | pub_key = dsa->pub_key; | |
d02b48c6 | 116 | |
ae5c8664 MC |
117 | { |
118 | BIGNUM local_prk; | |
119 | BIGNUM *prk; | |
46a64376 | 120 | |
ae5c8664 MC |
121 | if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0) { |
122 | BN_init(&local_prk); | |
123 | prk = &local_prk; | |
124 | BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME); | |
125 | } else | |
126 | prk = priv_key; | |
d02b48c6 | 127 | |
ae5c8664 MC |
128 | if (!BN_mod_exp(pub_key, dsa->g, prk, dsa->p, ctx)) |
129 | goto err; | |
130 | } | |
d02b48c6 | 131 | |
ae5c8664 MC |
132 | dsa->priv_key = priv_key; |
133 | dsa->pub_key = pub_key; | |
134 | ok = 1; | |
d02b48c6 | 135 | |
ae5c8664 MC |
136 | err: |
137 | if ((pub_key != NULL) && (dsa->pub_key == NULL)) | |
138 | BN_free(pub_key); | |
139 | if ((priv_key != NULL) && (dsa->priv_key == NULL)) | |
140 | BN_free(priv_key); | |
141 | if (ctx != NULL) | |
142 | BN_CTX_free(ctx); | |
143 | return (ok); | |
144 | } | |
d02f751c | 145 | #endif |