[Cryptography Team] Reading ssh pub/private keys

[Bert Freudenberg]

Hi folks,

I have an ssh-format keypair and would like to extract the (p,q,g,x)  
and (p,q,g,y) DSA tuples from that. The private key looks like this:

-----BEGIN DSA PRIVATE KEY-----
MIIBuwIB..............XCIa3cIp
-----END DSA PRIVATE KEY-----

and the public key:

ssh-dss AAAAB3NzaC1k.........nNEnWCasjXraVA==

So this looks like Base64-encoded numbers, but how are they encoded?  
The only reference I found was this:

http://www.openssh.com/txt/draft-ietf-secsh-publickeyfile-02.txt

But it does not detail how the "binary blob" translates to DSA tuples.

- Bert -