int DSA_generate_key(DSA *dsa)
{
int ok=0;
BN_CTX *ctx=NULL;
BIGNUM *pub_key=NULL,*priv_key=NULL;
if ((ctx=BN_CTX_new()) == NULL) goto err;
if (dsa->priv_key == NULL)
{
if ((priv_key=BN_new()) == NULL) goto err;
}
else
priv_key=dsa->priv_key;
do
if (!BN_rand_range(priv_key,dsa->q)) goto err;
while (BN_is_zero(priv_key));
if (dsa->pub_key == NULL)
{
if ((pub_key=BN_new()) == NULL) goto err;
}
else
pub_key=dsa->pub_key;
if (!BN_mod_exp(pub_key,dsa->g,priv_key,dsa->p,ctx)) goto err;
dsa->priv_key=priv_key;
dsa->pub_key=pub_key;
if(!fips_check_dsa(dsa))
goto err;
ok=1;
err:
if ((pub_key != NULL) && (dsa->pub_key == NULL)) BN_free(pub_key);
if ((priv_key != NULL) && (dsa->priv_key == NULL)) BN_free(priv_key);
if (ctx != NULL) BN_CTX_free(ctx);
return(ok);
}
static int dsa_builtin_keygen(DSA *dsa)
{
int ok = 0;
BN_CTX *ctx = NULL;
BIGNUM *pub_key = NULL, *priv_key = NULL;
if (FIPS_mode()
&& (BN_num_bits(dsa->p) < OPENSSL_DSA_FIPS_MIN_MODULUS_BITS)) {
DSAerr(DSA_F_DSA_BUILTIN_KEYGEN, DSA_R_KEY_SIZE_TOO_SMALL);
goto err;
}
if ((ctx = BN_CTX_new()) == NULL)
goto err;
if (dsa->priv_key == NULL) {
if ((priv_key = BN_new()) == NULL)
goto err;
} else
priv_key = dsa->priv_key;
do
if (!BN_rand_range(priv_key, dsa->q))
goto err;
while (BN_is_zero(priv_key)) ;
if (dsa->pub_key == NULL) {
if ((pub_key = BN_new()) == NULL)
goto err;
} else
pub_key = dsa->pub_key;
{
BIGNUM local_prk;
BIGNUM *prk;
if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0) {
BN_init(&local_prk);
prk = &local_prk;
BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME);
} else
prk = priv_key;
if (!BN_mod_exp(pub_key, dsa->g, prk, dsa->p, ctx))
goto err;
}
dsa->priv_key = priv_key;
dsa->pub_key = pub_key;
if (fips_dsa_pairwise_fail)
BN_add_word(dsa->pub_key, 1);
if (!fips_check_dsa(dsa))
goto err;
ok = 1;
err:
if ((pub_key != NULL) && (dsa->pub_key == NULL))
BN_free(pub_key);
if ((priv_key != NULL) && (dsa->priv_key == NULL))
BN_free(priv_key);
if (ctx != NULL)
BN_CTX_free(ctx);
return (ok);
}