jce

jdk8：
jce 下载地址：http://www.oracle.com/technetwork/java/javase/downloads/jce8-download-2133166.html

jdk7：

http://www.oracle.com/technetwork/java/javase/downloads/jce-7-download-432124.html

http://docs.oracle.com/javase/6/docs/technotes/guides/security/crypto/HowToImplAProvider.html

http://docs.oracle.com/javase/6/docs/technotes/guides/security/crypto/CryptoSpec.html