def get_base64(self):
return base64.encodestring(str(self)).replace('<STR_LIT:\n>', '<STR_LIT>')<EOL>
Return a base64 string containing the public part of this key.  Nothing
secret is revealed.  This format is compatible with that used to store
public key files or recognized host keys.

@return: a base64 string containing the public part of the key.
@rtype: str