public byte[] getPasswordSalt() {
        return passwordSalt;
    }
Returns the random salt that was used when generating this user's
password hash. This may be null if the user was not retrieved from the
database, and setPassword() has not yet been called.

@return
    The random salt that was used when generating this user's password
    hash.
extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-base/src/main/java/org/apache/guacamole/auth/jdbc/user/UserModel.java