DES安全编码组件
支持 DES、DESede(TripleDES,就是3DES)、AES、Blowfish、RC2、RC4(ARCFOUR)
DES key size must be equal to 56
DESede(TripleDES) key size must be equal to 112 or 168
AES key size must be equal to 128, 192 or 256,but 192 and 256 bits may not be available
Blowfish key size must be multiple of 8, and can only range from 32 to 448 (inclusive)
RC2 key size must be between 40 and 1024 bits
RC4(ARCFOUR) key size must be between 40 and 1024 bits
具体内容 需要关注 JDK Document http://.../docs/technotes/guides/security/SunProviders.html
