一个DES的加密解密算法完整实现 包括S盒等重要实现，另外此程序还实现了文件数据流的加密解密

DESAlgorithm.java

DesHelper.java

DESStream.java

// des算法初始置换表ip

　　public static final int[] IP = { 58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44,

　　　　　　36, 28, 20, 12, 4, 62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48, 40,

　　　　　　32, 24, 16, 8, 57, 49, 41, 33, 25, 17, 9, 1, 59, 51, 43, 35, 27,

　　　　　　19, 11, 3, 61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23,

　　　　　　15, 7 }



　　// des算法终结置换表ip-1

　　public static final int[] IP_1 = { 40, 8, 48, 16, 56, 24, 64, 32, 39, 7,

　　　　　　47, 15, 55, 23, 63, 31, 38, 6, 46, 14, 54, 22, 62, 30, 37, 5, 45,

　　　　　　13, 53, 21, 61, 29, 36, 4, 44, 12, 52, 20, 60, 28, 35, 3, 43, 11,

　　　　　　51, 19, 59, 27, 34, 2, 42, 10, 50, 18, 58, 26, 33, 1, 41, 9, 49,

　　　　　　17, 57, 25 } 等-A DES, encryption and decryption algorithms, including the full realization of S boxes and other important implementation, the program also implements other file data stream encryption and decryption

DESAlgorithm.java

DesHelper.java

DESStream.java

// des算法初始置换表ip

　　public static final int[] IP = { 58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44,

　　　　　　36, 28, 20, 12, 4, 62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48, 40,

　　　　　　32, 24, 16, 8, 57, 49, 41, 33, 25, 17, 9, 1, 59, 51, 43, 35, 27,

　　　　　　19, 11, 3, 61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23,

　　　　　　15, 7 }



　　// des算法终结置换表ip-1

　　public static final int[] IP_1 = { 40, 8, 48, 16, 56, 24, 64, 32, 39, 7,

　　　　　　47, 15, 55, 23, 63, 31, 38, 6, 46, 14, 54, 22, 62, 30, 37, 5, 45,

　　　　　　13, 53, 21, 61, 29, 36, 4, 44, 12, 52, 20, 60, 28, 35, 3, 43, 11,

　　　　　　51, 19, 59, 27, 34, 2, 42, 10, 50, 18, 58, 26, 33, 1, 41, 9, 49,

　　　　　　17, 57, 25 } and so on