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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. | |
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" | |
751ff1d3 | 62 | #ifndef OPENSSL_NO_SHA |
ec577822 BM |
63 | #include <openssl/bn.h> |
64 | #include <openssl/dsa.h> | |
65 | #include <openssl/rand.h> | |
d02b48c6 | 66 | |
20818e00 DSH |
67 | #ifdef OPENSSL_FIPS |
68 | ||
69 | #include <openssl/fips.h> | |
70 | #include <openssl/evp.h> | |
71 | ||
72 | static int fips_dsa_pairwise_fail = 0; | |
73 | ||
74 | void FIPS_corrupt_dsa_keygen(void) | |
75 | { | |
76 | fips_dsa_pairwise_fail = 1; | |
77 | } | |
78 | ||
79 | static int fips_check_dsa(DSA *dsa) | |
80 | { | |
81 | EVP_PKEY pk; | |
82 | unsigned char tbs[] = "DSA Pairwise Check Data"; | |
83 | pk.type = EVP_PKEY_DSA; | |
84 | pk.pkey.dsa = dsa; | |
85 | ||
86 | if (!fips_pkey_signature_test(&pk, tbs, -1, | |
87 | NULL, 0, EVP_sha1(), 0, NULL)) | |
88 | { | |
89 | FIPSerr(FIPS_F_FIPS_CHECK_DSA,FIPS_R_PAIRWISE_TEST_FAILED); | |
90 | fips_set_selftest_fail(); | |
91 | return 0; | |
92 | } | |
93 | return 1; | |
94 | } | |
95 | ||
96 | #endif | |
97 | ||
0e4aa0d2 GT |
98 | static int dsa_builtin_keygen(DSA *dsa); |
99 | ||
6b691a5c | 100 | int DSA_generate_key(DSA *dsa) |
0e4aa0d2 GT |
101 | { |
102 | if(dsa->meth->dsa_keygen) | |
103 | return dsa->meth->dsa_keygen(dsa); | |
104 | return dsa_builtin_keygen(dsa); | |
105 | } | |
106 | ||
107 | static int dsa_builtin_keygen(DSA *dsa) | |
d02b48c6 RE |
108 | { |
109 | int ok=0; | |
d02b48c6 RE |
110 | BN_CTX *ctx=NULL; |
111 | BIGNUM *pub_key=NULL,*priv_key=NULL; | |
112 | ||
20818e00 DSH |
113 | #ifdef OPENSSL_FIPS |
114 | if (FIPS_mode() && (BN_num_bits(dsa->p) < OPENSSL_DSA_FIPS_MIN_MODULUS_BITS)) | |
115 | { | |
116 | DSAerr(DSA_F_DSA_BUILTIN_KEYGEN, DSA_R_KEY_SIZE_TOO_SMALL); | |
117 | goto err; | |
118 | } | |
119 | #endif | |
120 | ||
d02b48c6 RE |
121 | if ((ctx=BN_CTX_new()) == NULL) goto err; |
122 | ||
123 | if (dsa->priv_key == NULL) | |
124 | { | |
125 | if ((priv_key=BN_new()) == NULL) goto err; | |
126 | } | |
127 | else | |
128 | priv_key=dsa->priv_key; | |
129 | ||
12c2fe8d UM |
130 | do |
131 | if (!BN_rand_range(priv_key,dsa->q)) goto err; | |
132 | while (BN_is_zero(priv_key)); | |
d02b48c6 RE |
133 | |
134 | if (dsa->pub_key == NULL) | |
135 | { | |
136 | if ((pub_key=BN_new()) == NULL) goto err; | |
137 | } | |
138 | else | |
139 | pub_key=dsa->pub_key; | |
46a64376 BM |
140 | |
141 | { | |
142 | BIGNUM local_prk; | |
143 | BIGNUM *prk; | |
144 | ||
145 | if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0) | |
146 | { | |
a28a5d9c | 147 | BN_init(&local_prk); |
46a64376 | 148 | prk = &local_prk; |
bd31fb21 | 149 | BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME); |
46a64376 BM |
150 | } |
151 | else | |
152 | prk = priv_key; | |
d02b48c6 | 153 | |
46a64376 BM |
154 | if (!BN_mod_exp(pub_key,dsa->g,prk,dsa->p,ctx)) goto err; |
155 | } | |
d02b48c6 RE |
156 | |
157 | dsa->priv_key=priv_key; | |
158 | dsa->pub_key=pub_key; | |
20818e00 DSH |
159 | #ifdef OPENSSL_FIPS |
160 | if (fips_dsa_pairwise_fail) | |
161 | BN_add_word(dsa->pub_key, 1); | |
162 | if(!fips_check_dsa(dsa)) | |
163 | #endif | |
164 | goto err; | |
d02b48c6 RE |
165 | ok=1; |
166 | ||
167 | err: | |
168 | if ((pub_key != NULL) && (dsa->pub_key == NULL)) BN_free(pub_key); | |
169 | if ((priv_key != NULL) && (dsa->priv_key == NULL)) BN_free(priv_key); | |
170 | if (ctx != NULL) BN_CTX_free(ctx); | |
171 | return(ok); | |
172 | } | |
d02f751c | 173 | #endif |