Print out client session data.

def get_session_data(ctx, username, password, salt, server_public, private, preset):
    """Print out client session data."""
    session = SRPClientSession(
        SRPContext(username, password, prime=preset[0], generator=preset[1]),
        private=private)

    session.process(server_public, salt, base64=True)

    click.secho('Client session key: %s' % session.key_b64)
    click.secho('Client session key proof: %s' % session.key_proof_b64)
    click.secho('Client session key hash: %s' % session.key_proof_hash_b64)