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git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/dsa/dsa_key.c
2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
12 #include "internal/cryptlib.h"
13 #include <openssl/bn.h>
16 static int dsa_builtin_keygen(DSA
*dsa
);
18 int DSA_generate_key(DSA
*dsa
)
20 if (dsa
->meth
->dsa_keygen
)
21 return dsa
->meth
->dsa_keygen(dsa
);
22 return dsa_builtin_keygen(dsa
);
25 static int dsa_builtin_keygen(DSA
*dsa
)
29 BIGNUM
*pub_key
= NULL
, *priv_key
= NULL
;
31 if ((ctx
= BN_CTX_new()) == NULL
)
34 if (dsa
->priv_key
== NULL
) {
35 if ((priv_key
= BN_secure_new()) == NULL
)
38 priv_key
= dsa
->priv_key
;
41 if (!BN_priv_rand_range(priv_key
, dsa
->q
))
43 while (BN_is_zero(priv_key
)) ;
45 if (dsa
->pub_key
== NULL
) {
46 if ((pub_key
= BN_new()) == NULL
)
49 pub_key
= dsa
->pub_key
;
52 BIGNUM
*prk
= BN_new();
56 BN_with_flags(prk
, priv_key
, BN_FLG_CONSTTIME
);
58 if (!BN_mod_exp(pub_key
, dsa
->g
, prk
, dsa
->p
, ctx
)) {
62 /* We MUST free prk before any further use of priv_key */
66 dsa
->priv_key
= priv_key
;
67 dsa
->pub_key
= pub_key
;
71 if (pub_key
!= dsa
->pub_key
)
73 if (priv_key
!= dsa
->priv_key
)