|
1 /* crypto/dsa/dsa_key.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 #include <stdio.h> |
|
60 #include <time.h> |
|
61 #include "cryptlib.h" |
|
62 #ifndef OPENSSL_NO_SHA |
|
63 #include <openssl/bn.h> |
|
64 #include <openssl/dsa.h> |
|
65 #include <openssl/rand.h> |
|
66 |
|
67 static int dsa_builtin_keygen(DSA *dsa); |
|
68 |
|
69 EXPORT_C int DSA_generate_key(DSA *dsa) |
|
70 { |
|
71 if(dsa->meth->dsa_keygen) |
|
72 return dsa->meth->dsa_keygen(dsa); |
|
73 return dsa_builtin_keygen(dsa); |
|
74 } |
|
75 |
|
76 static int dsa_builtin_keygen(DSA *dsa) |
|
77 { |
|
78 int ok=0; |
|
79 BN_CTX *ctx=NULL; |
|
80 BIGNUM *pub_key=NULL,*priv_key=NULL; |
|
81 |
|
82 if ((ctx=BN_CTX_new()) == NULL) goto err; |
|
83 |
|
84 if (dsa->priv_key == NULL) |
|
85 { |
|
86 if ((priv_key=BN_new()) == NULL) goto err; |
|
87 } |
|
88 else |
|
89 priv_key=dsa->priv_key; |
|
90 |
|
91 do |
|
92 if (!BN_rand_range(priv_key,dsa->q)) goto err; |
|
93 while (BN_is_zero(priv_key)); |
|
94 |
|
95 if (dsa->pub_key == NULL) |
|
96 { |
|
97 if ((pub_key=BN_new()) == NULL) goto err; |
|
98 } |
|
99 else |
|
100 pub_key=dsa->pub_key; |
|
101 |
|
102 { |
|
103 BIGNUM local_prk; |
|
104 BIGNUM *prk; |
|
105 |
|
106 if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0) |
|
107 { |
|
108 BN_init(&local_prk); |
|
109 prk = &local_prk; |
|
110 BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME); |
|
111 } |
|
112 else |
|
113 prk = priv_key; |
|
114 |
|
115 if (!BN_mod_exp(pub_key,dsa->g,prk,dsa->p,ctx)) goto err; |
|
116 } |
|
117 |
|
118 dsa->priv_key=priv_key; |
|
119 dsa->pub_key=pub_key; |
|
120 ok=1; |
|
121 |
|
122 err: |
|
123 if ((pub_key != NULL) && (dsa->pub_key == NULL)) BN_free(pub_key); |
|
124 if ((priv_key != NULL) && (dsa->priv_key == NULL)) BN_free(priv_key); |
|
125 if (ctx != NULL) BN_CTX_free(ctx); |
|
126 return(ok); |
|
127 } |
|
128 #endif |