@Override
        public String getName() { return "totp-mode"; }
The hash algorithm that should be used to generate TOTP codes. By
default, this will be "sha1". Legal values are "sha1", "sha256", and
"sha512".
extensions/guacamole-auth-totp/src/main/java/org/apache/guacamole/auth/totp/conf/ConfigurationService.java