Branch data Line data Source code
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 : : #define OPENSSL_FIPSAPI
60 : :
61 : : #include <stdio.h>
62 : : #include <time.h>
63 : : #include "cryptlib.h"
64 : : #ifndef OPENSSL_NO_SHA
65 : : #include <openssl/bn.h>
66 : : #include <openssl/dsa.h>
67 : : #include <openssl/rand.h>
68 : :
69 : : #ifdef OPENSSL_FIPS
70 : :
71 : : #include <openssl/fips.h>
72 : : #include <openssl/evp.h>
73 : :
74 : : static int fips_check_dsa(DSA *dsa)
75 : : {
76 : : EVP_PKEY pk;
77 : : unsigned char tbs[] = "DSA Pairwise Check Data";
78 : : pk.type = EVP_PKEY_DSA;
79 : : pk.pkey.dsa = dsa;
80 : :
81 : : if (!fips_pkey_signature_test(FIPS_TEST_PAIRWISE,
82 : : &pk, tbs, 0, NULL, 0, NULL, 0, NULL))
83 : : {
84 : : FIPSerr(FIPS_F_FIPS_CHECK_DSA,FIPS_R_PAIRWISE_TEST_FAILED);
85 : : fips_set_selftest_fail();
86 : : return 0;
87 : : }
88 : : return 1;
89 : : }
90 : :
91 : : #endif
92 : :
93 : : static int dsa_builtin_keygen(DSA *dsa);
94 : :
95 : 4 : int DSA_generate_key(DSA *dsa)
96 : : {
97 [ - + ]: 4 : if(dsa->meth->dsa_keygen)
98 : 0 : return dsa->meth->dsa_keygen(dsa);
99 : 4 : return dsa_builtin_keygen(dsa);
100 : : }
101 : :
102 : 4 : static int dsa_builtin_keygen(DSA *dsa)
103 : : {
104 : 4 : int ok=0;
105 : 4 : BN_CTX *ctx=NULL;
106 : 4 : BIGNUM *pub_key=NULL,*priv_key=NULL;
107 : :
108 : : #ifdef OPENSSL_FIPS
109 : : if (FIPS_module_mode() && !(dsa->flags & DSA_FLAG_NON_FIPS_ALLOW)
110 : : && (BN_num_bits(dsa->p) < OPENSSL_DSA_FIPS_MIN_MODULUS_BITS))
111 : : {
112 : : DSAerr(DSA_F_DSA_BUILTIN_KEYGEN, DSA_R_KEY_SIZE_TOO_SMALL);
113 : : goto err;
114 : : }
115 : : if (!fips_check_dsa_prng(dsa, 0, 0))
116 : : goto err;
117 : : #endif
118 : :
119 [ + - ]: 4 : if ((ctx=BN_CTX_new()) == NULL) goto err;
120 : :
121 [ + + ]: 4 : if (dsa->priv_key == NULL)
122 : : {
123 [ + - ]: 4 : if ((priv_key=BN_new()) == NULL) goto err;
124 : : }
125 : : else
126 : : priv_key=dsa->priv_key;
127 : :
128 : : do
129 [ + - ]: 4 : if (!BN_rand_range(priv_key,dsa->q)) goto err;
130 [ - + ]: 4 : while (BN_is_zero(priv_key));
131 : :
132 [ + + ]: 4 : if (dsa->pub_key == NULL)
133 : : {
134 [ + - ]: 2 : if ((pub_key=BN_new()) == NULL) goto err;
135 : : }
136 : : else
137 : : pub_key=dsa->pub_key;
138 : :
139 : : {
140 : : BIGNUM local_prk;
141 : : BIGNUM *prk;
142 : :
143 [ + + ]: 4 : if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0)
144 : : {
145 : 2 : BN_init(&local_prk);
146 : 2 : prk = &local_prk;
147 : 2 : BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME);
148 : : }
149 : : else
150 : : prk = priv_key;
151 : :
152 [ + - ]: 4 : if (!BN_mod_exp(pub_key,dsa->g,prk,dsa->p,ctx)) goto err;
153 : : }
154 : :
155 : 4 : dsa->priv_key=priv_key;
156 : 4 : dsa->pub_key=pub_key;
157 : : #ifdef OPENSSL_FIPS
158 : : if(!fips_check_dsa(dsa))
159 : : {
160 : : dsa->pub_key = NULL;
161 : : dsa->priv_key = NULL;
162 : : goto err;
163 : : }
164 : : #endif
165 : 4 : ok=1;
166 : :
167 : : err:
168 [ + - ][ - + ]: 4 : if ((pub_key != NULL) && (dsa->pub_key == NULL)) BN_free(pub_key);
169 [ + - ][ - + ]: 4 : if ((priv_key != NULL) && (dsa->priv_key == NULL)) BN_free(priv_key);
170 [ + - ]: 4 : if (ctx != NULL) BN_CTX_free(ctx);
171 : 4 : return(ok);
172 : : }
173 : : #endif
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