DSA_generate_key —
generate DSA key pair
DSA_generate_key()
expects a to contain DSA parameters. It generates a
new key pair and stores it in a->pub_key and
a->priv_key.
DSA_generate_key() returns 1 on success or
0 otherwise. The error codes can be obtained by
ERR_get_error(3).
DSA_generate_key() first appeared in
SSLeay 0.6.0 and has been available since OpenBSD
2.4.