I finally found it.
echo -n ${key}258EAFA5-E914-47DA-95CA-C5AB0DC85B11|openssl dgst -sha1
-binary|base64
Thanks,
Jerry
Mon Mar  6 14:48:17 UTC 2017 
 Jerry Geis <jerry.geis at gmail.com>
I finally found it.
echo -n ${key}258EAFA5-E914-47DA-95CA-C5AB0DC85B11|openssl dgst -sha1
-binary|base64
Thanks,
Jerry