Information about a given DSA Key

Information about a given DSA Key

Reading the answer http://superuser.com/a/13189/246855 to the question
What is better for GPG keys - RSA or DSA?, I decided to examine the 2048
bit DSA key I use to figure out which secure hash algorithm was used to
create the key.
However, I am unable to figure out how to find out the function used to
generate the key, as Google and ssh-keygen and openssl dsa give me
nothing.
In summary, How do I figure out the Secure hash function used to generate
a given 2048 bit DSA key.