PBKDF2WithHmacSHA1 for mosquitto-auth-plug PBKDF2 java mosquitto-auth-plug mosquitto
BASE64 commons-codec-1.10.jar maven：
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>1.10</version>
</dependency>
pbkdf2-check ref https://github.com/jpmens/mosquitto-auth-plug/blob/master/pbkdf2-check.c