Given final block not properly padded

Given final block not properly padded

JAVA语言DES算法：http://blog.youkuaiyun.com/ljheee/article/details/51471098

获取Cipher对象的时候一定要写成

Cipher cipher = Cipher.getInstance("DES/ECB/NoPadding");

不要写成

Cipher cipher = Cipher.getInstance("DES");

否则解密的时候会报错：

Given final block not properly padded

原因是Cipher cipher = Cipher.getInstance("DES");与Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");等同，填充方式错误，加密的时候会得到16长度的字节数组。

DES加密算法原理[pdf文档]：http://download.youkuaiyun.com/detail/ljheee/9527833

还有一类常见错误

javax.crypto.IllegalBlockSizeException: Input length must be multiple of 8 when decrypting with padded cipher

解密时，要求传入的参数是8的倍数。

JCE详解传送门：http://docs.oracle.com/javase/1.5.0/docs/guide/security/jce/JCERefGuide.html

参考、转载地址:http://blog.youkuaiyun.com/zbz0425/article/details/14223537