DES加密解密类

public class DES {

//十六进制符号表
static final char[] hex = new char[] {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
//默认密钥
private String encryptKey = "abcd1234";

//密钥缩位映射表1，共56位
//左边28位
static final int []keyMapC1 =new int[]{57,49,41,33,25,17,9, 
   1,58,50,42,34,26,18,10,2,59,51,43,35,27, 19,11,3,60,52,44,36
};
//右边28位
static final int []keyMapD1 = new int[]{63,55,47,39,31,23,15, 
   7,62,54,46,38,30,22,14,6,61,53,45,37,29,21,13,5,28,20,12,4
};

//密钥缩位表2，共48位
static final int []keyMap2 = new int[]{14,17,11,24,1,5, 
   3,28,15,6,21,10,23,19,12,4,26,8,16,7,27,20,13,2, 
   41,52,31,37,47,55,30,40,51,45,33,48,44,49,39,56,34,53, 
   46,42,50,36,29,32
};

//密钥变换循环移位表,16位
static final int []ccmovebit = new int[]{1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};

//密钥产生过程中使用的临时数组
private int [][]C = new int[17][28];

private int [][]D = new int[17][28];
private int [][]keyMap = new int[17][48];

//开始S盒加密时换位表1,64位
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 
     };

//结束S盒加密时换位表2,64位
static final  int _ip[] = {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 
        };

 //放大换位表: 32bit->48bit
static final int e[] = {32,1, 2, 3, 4, 5,4, 5, 6, 7, 8, 9, 
        8, 9, 10,11,12,13,12,13,14,15,16,17, 
        16,17,18,19,20,21,20,21,22,23,24,25, 
        24,25,26,27,28,29,28,29,30,31,32,1 
        };

//缩小换位表：48bit->32bit
static final int e2[] = {16,7,20,21,29,12,28,17,1,15,23,26, 
        5,18,31,10,2,8,24,14,32,27,3,9,19,13,30,6,22,11,4,25
        };

//S盒矩阵