public int getRecommendedKeyLength() {
            return recommendedKeyLength;
        }
Returns the recommended length of keys generated for TOTP in this
mode, in bytes. Keys are recommended to be the same length as the
hash involved.

@return
    The recommended length of keys generated for TOTP in this mode,
    in bytes.
extensions/guacamole-auth-totp/src/main/java/org/apache/guacamole/totp/TOTPGenerator.java