There is RSAPrivateKey_dup, why no counterpart for DSA/DH cert

[Bruce (Riji) Cai]

Hi,

My questions actually are two:

 1.  dup, which should stand for duplicate, in what case we should use such API.
 2.  RSA is only one kind of cert alg, so I expect counterpart for other alg 
certificate such as DH/DSA, but I can't find them in openssl 1.0.1c

Thanks