@Override
        public byte[] encode(final byte[] in) {
            return encode(in, MAP);
        }
A mod of Square's Okio Base64 encoder
<p>
Original author: Alexander Y. Kleymenov

@see <a href="https://github.com/square/okio/blob/okio-parent-1.15.0/okio/src/main/java/okio/Base64.java">Okio</a>
crypto/support/hashes/bcrypt/src/main/java/org/apache/shiro/crypto/support/hashes/bcrypt/OpenBSDBase64.java