DES加密算法

我用c做过一个
#include<fstream.h>
static char IP_Table[64] = {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};
static char IPR_Table[64] = {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};
static char E_Table[48] = {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,
           28,29,30,31,32,31};
static char P_Table[32] ={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};
static char PC1_Table[56] = {
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,
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
};
static char PC2_Table[48] = {
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
};
static char LOOP_Table[16] = {
1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1
};
static char S_box[8][4][16] = {
// S1
14,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7,
               0,15,7,4,14,2,13,1,10,6,12,11,9,5,3,8,
               4,1,14,8,13,6,2,11,15,12,9,7,3,10,5,0,
               15,12,8,2,4,9,1,7,5,11,3,14,10,0,6,13,
// S2
    15,1,8,14,6,11,3,4,9,7,2,13,12,0,5,10,
               3,13,4,7,15,2,8,14,12,0,1,10,6,9,11,5,
               0,14,7,11,10,4,13,1,5,8,12,6,9,3,2,15,
               13,8,10,1,3,15,4,2,11,6,7,12,0,5,14,9,
// S3
    10,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8,
                13,7,0,9,3,4,6,10,2,8,5,14,12,11,15,1,
               13,6,4,9,8,15,3,0,11,1,2,12,5,10,14,7,
               1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12,
// S4
    7,13,14,3,0,6,9,10,1,2,8,5,11,12,4,15,
               13,8,11,5,6,15,0,3,4,7,2,12,1,10,14,9,
               10,6,9,0,12,11,7,13,15,1,3,14,5,2,8,4,
               3,15,0,6,10,1,13,8,9,4,5,11,12,7,2,14,
// S5
    2,12,4,1,7,10,11,6,8,5,3,15,13,0,14,9,
               14,11,2,12,4,7,13,1,5,0,15,10,3,9,8,6,
               4,2,1,11,10,13,7,8,15,9,12,5,6,3,0,14,
               11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3,
// S6
    12,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11,
               10,15,4,2,7,12,9,5,6,1,13,14,0,11,3,8,
                9,14,15,5,2,8,12,3,7,0,4,10,1,13,11,6,
               4,3,2,12,9,5,15,10,11,14,1,7,6,0,8,13,
// S7
    4,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1,
               13,0,11,7,4,9,1,10,14,3,5,12,2,15,8,6,
               1,4,11,13,12,3,7,14,10,15,6,8,0,5,9,2,
               6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12,
// S8
    13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7,
               1,15,13,8,10,3,7,4,12,5,6,11,0,14,9,2,
               7,11,4,1,9,12,14,2,0,6,10,13,15,3,5,8,
               2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11
};
//order key
static char orderkey[2][16]={
0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
15, 14, 13, 12, 11, 10,  9,  8,  7,  6,  5,  4,  3,  2,  1,  0
};
//key
static char subKey[16][48];
//const static char
//*********************************************************************
//代码入口void init(char *ycode,char *mcode){
for(char i=7,b=63;i>=0;i--){
unsigned char a=ycode[i];
for(char j=0;j<8;j++){
mcode[b--]=a%2;
a=a/2;
}
}
}
void uninit(char *mcode,char *ycode){
for(char i=0,b=0;i<8;i++){
ycode[i]=0;
for(char j=0;j<8;j++){
ycode[i]=ycode[i]*2;
ycode[i]=ycode[i]+mcode[b++];
}
}
}
void cp(char *ycode,char *mcode,int n){
for(int i=0;i<n;i++)
mcode[i]=ycode[i];
}
void exchange(char *r,char *t,int n,const char *order){
char *s=new char[n];
for(int i=0;i<n;i++)
s[i]=r[order[i]-1];
cp(s,t,n);
}
void schange(int i,char *in,char *out){
char c=S_box[i][in[0]*2+in[5]][in[1]*8+in[2]*4+in[3]*2+in[4]];
for(int j=3;j>=0;j--){
out[j]=c%2;
c=c/2;}
}
void sbox(char *ycode){
for(int i=0;i<8;i++){
schange(i,&ycode[6*i],&ycode[4*i]);
}
}
void rol(char *mcode,int n,int k){
char *c=new char[k];
for(int i=0;i<k;i++)
c[i]=mcode[i];
for(i=k;i<n;i++)
mcode[i-k]=mcode[i];
for(i=0;i<k;i++)
mcode[i+n-k]=c[i];
}
void xor(char *s,char *r,char *t,int n){
for(int i=0;i<n;i++)
t[i]=(s[i]+r[i])%2;
}
void f(char *r,char i){
char t[48];
exchange(r,t,48,E_Table); //32~48放大换位
xor(t,subKey[i],t,48); //48+48与密钥
sbox(t); //S盒变换
exchange(t,r,32,P_Table); //32~32单纯换位
}
void makekey(char *ykey){
char mkey[64];
init(ykey,mkey); //位至字节转换
exchange(mkey,mkey,56,PC1_Table); //PC1换位
for(int i=0;i<16;i++){ //16次密钥计算循环
rol(mkey,28,LOOP_Table[i]);
rol(mkey+28,28,LOOP_Table[i]); //循环移位
exchange(mkey,subKey[i],48,PC2_Table); //PC2换位输出至密钥I
}
}
void run(char *ycode,char *scode,int order){
char mcode[64],tmp[32];
init(ycode,mcode); //位至字节转换
exchange(mcode,mcode,64,IP_Table); //初始置换IP
for(int i=0;i<16;i++){ //16次密文计算循环
cp(mcode+32,tmp,32); //tmp=R(i)
f(mcode+32,orderkey[order][i]); //R(i)=f(Ri,Ki)
xor(mcode,mcode+32,mcode+32,32); //R(i+1)=L(i)xorR(i)
cp(tmp,mcode,32); //L(i+1)=tmp
}
cp(mcode,tmp,32);
cp(mcode+32,mcode,32);
cp(tmp,mcode+32,32); //左右交换
exchange(mcode,mcode,64,IPR_Table); //逆置换IP
uninit(mcode,scode); //字节至位转换
}
//代码结尾
//调试主程序void main(){
char key[]="computer",code[]="security";
// cin>>key;
// cin>>code;
cout<<"key:\n"<<key<<endl;
makekey(key);
cout<<"Before encrypting:\n"<<code<<endl;
run(code,code,0);
cout<<"after encrypting:\n"<<code<<endl;
run(code,code,1);
cout<<"after decrypting:\n"<<code<<endl;
}

public class DESCodec
{
    private final boolean DEBUG = false;
    private final boolean DEBUG2 = false;
    static final byte ENCRYPT = 0;
    static final byte DECRYPT = 1;
    private int ek[];
    private int dk[];
    private static final short bytebit[] = {
        128, 64, 32, 16, 8, 4, 2, 1
    };
    private static final int bigbyte[] = {
        0x800000, 0x400000, 0x200000, 0x100000, 0x80000, 0x40000, 0x20000, 0x10000, 32768, 16384,
        8192, 4096, 2048, 1024, 512, 256, 128, 64, 32, 16,
        8, 4, 2, 1
    };
    private static final byte pc1[] = {
        56, 48, 40, 32, 24, 16, 8, 0, 57, 49,
        41, 33, 25, 17, 9, 1, 58, 50, 42, 34,
        26, 18, 10, 2, 59, 51, 43, 35, 62, 54,
        46, 38, 30, 22, 14, 6, 61, 53, 45, 37,
        29, 21, 13, 5, 60, 52, 44, 36, 28, 20,
        12, 4, 27, 19, 11, 3
    };
    private static final byte totrot[] = {
        1, 2, 4, 6, 8, 10, 12, 14, 15, 17,
        19, 21, 23, 25, 27, 28
    };
    private static final byte pc2[] = {
        13, 16, 10, 23, 0, 4, 2, 27, 14, 5,
        20, 9, 22, 18, 11, 3, 25, 7, 15, 6,
        26, 19, 12, 1, 40, 51, 30, 36, 46, 54,
        29, 39, 50, 44, 32, 47, 43, 48, 38, 55,
        33, 52, 45, 41, 49, 35, 28, 31
    };
    private static final int sp1[] = {
        0x1010400, 0, 0x10000, 0x1010404, 0x1010004, 0x10404, 4, 0x10000, 1024, 0x1010400,
        0x1010404, 1024, 0x1000404, 0x1010004, 0x1000000, 4, 1028, 0x1000400, 0x1000400, 0x10400,
        0x10400, 0x1010000, 0x1010000, 0x1000404, 0x10004, 0x1000004, 0x1000004, 0x10004, 0, 1028,
        0x10404, 0x1000000, 0x10000, 0x1010404, 4, 0x1010000, 0x1010400, 0x1000000, 0x1000000, 1024,
        0x1010004, 0x10000, 0x10400, 0x1000004, 1024, 4, 0x1000404, 0x10404, 0x1010404, 0x10004,
        0x1010000, 0x1000404, 0x1000004, 1028, 0x10404, 0x1010400, 1028, 0x1000400, 0x1000400, 0,
        0x10004, 0x10400, 0, 0x1010004
    };
    private static final int sp2[] = {
        0x80108020, 0x80008000, 32768, 0x108020, 0x100000, 32, 0x80100020, 0x80008020, 0x80000020, 0x80108020,
        0x80108000, 0x80000000, 0x80008000, 0x100000, 32, 0x80100020, 0x108000, 0x100020, 0x80008020, 0,
        0x80000000, 32768, 0x108020, 0x80100000, 0x100020, 0x80000020, 0, 0x108000, 32800, 0x80108000,
        0x80100000, 32800, 0, 0x108020, 0x80100020, 0x100000, 0x80008020, 0x80100000, 0x80108000, 32768,
        0x80100000, 0x80008000, 32, 0x80108020, 0x108020, 32, 32768, 0x80000000, 32800, 0x80108000,
        0x100000, 0x80000020, 0x100020, 0x80008020, 0x80000020, 0x100020, 0x108000, 0, 0x80008000, 32800,
        0x80000000, 0x80100020, 0x80108020, 0x108000
    };
    private static final int sp3[] = {
        520, 0x8020200, 0, 0x8020008, 0x8000200, 0, 0x20208, 0x8000200, 0x20008, 0x8000008,
        0x8000008, 0x20000, 0x8020208, 0x20008, 0x8020000, 520, 0x8000000, 8, 0x8020200, 512,
        0x20200, 0x8020000, 0x8020008, 0x20208, 0x8000208, 0x20200, 0x20000, 0x8000208, 8, 0x8020208,
        512, 0x8000000, 0x8020200, 0x8000000, 0x20008, 520, 0x20000, 0x8020200, 0x8000200, 0,
        512, 0x20008, 0x8020208, 0x8000200, 0x8000008, 512, 0, 0x8020008, 0x8000208, 0x20000,
        0x8000000, 0x8020208, 8, 0x20208, 0x20200, 0x8000008, 0x8020000, 0x8000208, 520, 0x8020000,
        0x20208, 8, 0x8020008, 0x20200
    };
    private static final int sp4[] = {
        0x802001, 8321, 8321, 128, 0x802080, 0x800081, 0x800001, 8193, 0, 0x802000,
        0x802000, 0x802081, 129, 0, 0x800080, 0x800001, 1, 8192, 0x800000, 0x802001,
        128, 0x800000, 8193, 8320, 0x800081, 1, 8320, 0x800080, 8192, 0x802080,
        0x802081, 129, 0x800080, 0x800001, 0x802000, 0x802081, 129, 0, 0, 0x802000,
        8320, 0x800080, 0x800081, 1, 0x802001, 8321, 8321, 128, 0x802081, 129,
        1, 8192, 0x800001, 8193, 0x802080, 0x800081, 8193, 8320, 0x800000, 0x802001,
        128, 0x800000, 8192, 0x802080
    };
    private static final int sp5[] = {
        256, 0x2080100, 0x2080000, 0x42000100, 0x80000, 256, 0x40000000, 0x2080000, 0x40080100, 0x80000,
        0x2000100, 0x40080100, 0x42000100, 0x42080000, 0x80100, 0x40000000, 0x2000000, 0x40080000, 0x40080000, 0,
        0x40000100, 0x42080100, 0x42080100, 0x2000100, 0x42080000, 0x40000100, 0, 0x42000000, 0x2080100, 0x2000000,
        0x42000000, 0x80100, 0x80000, 0x42000100, 256, 0x2000000, 0x40000000, 0x2080000, 0x42000100, 0x40080100,
        0x2000100, 0x40000000, 0x42080000, 0x2080100, 0x40080100, 256, 0x2000000, 0x42080000, 0x42080100, 0x80100,
        0x42000000, 0x42080100, 0x2080000, 0, 0x40080000, 0x42000000, 0x80100, 0x2000100, 0x40000100, 0x80000,
        0, 0x40080000, 0x2080100, 0x40000100
    };
    private static final int sp6[] = {
        0x20000010, 0x20400000, 16384, 0x20404010, 0x20400000, 16, 0x20404010, 0x400000, 0x20004000, 0x404010,
        0x400000, 0x20000010, 0x400010, 0x20004000, 0x20000000, 16400, 0, 0x400010, 0x20004010, 16384,
        0x404000, 0x20004010, 16, 0x20400010, 0x20400010, 0, 0x404010, 0x20404000, 16400, 0x404000,
        0x20404000, 0x20000000, 0x20004000, 16, 0x20400010, 0x404000, 0x20404010, 0x400000, 16400, 0x20000010,
        0x400000, 0x20004000, 0x20000000, 16400, 0x20000010, 0x20404010, 0x404000, 0x20400000, 0x404010, 0x20404000,
        0, 0x20400010, 16, 16384, 0x20400000, 0x404010, 16384, 0x400010, 0x20004010, 0,
        0x20404000, 0x20000000, 0x400010, 0x20004010
    };
    private static final int sp7[] = {
        0x200000, 0x4200002, 0x4000802, 0, 2048, 0x4000802, 0x200802, 0x4200800, 0x4200802, 0x200000,
        0, 0x4000002, 2, 0x4000000, 0x4200002, 2050, 0x4000800, 0x200802, 0x200002, 0x4000800,
        0x4000002, 0x4200000, 0x4200800, 0x200002, 0x4200000, 2048, 2050, 0x4200802, 0x200800, 2,
        0x4000000, 0x200800, 0x4000000, 0x200800, 0x200000, 0x4000802, 0x4000802, 0x4200002, 0x4200002, 2,
        0x200002, 0x4000000, 0x4000800, 0x200000, 0x4200800, 2050, 0x200802, 0x4200800, 2050, 0x4000002,
        0x4200802, 0x4200000, 0x200800, 0, 2, 0x4200802, 0, 0x200802, 0x4200000, 2048,
        0x4000002, 0x4000800, 2048, 0x200002
    };
    private static final int sp8[] = {
        0x10001040, 4096, 0x40000, 0x10041040, 0x10000000, 0x10001040, 64, 0x10000000, 0x40040, 0x10040000,
        0x10041040, 0x41000, 0x10041000, 0x41040, 4096, 64, 0x10040000, 0x10000040, 0x10001000, 4160,
        0x41000, 0x40040, 0x10040040, 0x10041000, 4160, 0, 0, 0x10040040, 0x10000040, 0x10001000,
        0x41040, 0x40000, 0x41040, 0x40000, 0x10041000, 4096, 64, 0x10040040, 4096, 0x41040,
        0x10001000, 64, 0x10000040, 0x10040000, 0x10040040, 0x10000000, 0x40000, 0x10001040, 0, 0x10041040,
        0x40040, 0x10000040, 0x10040000, 0x10001000, 0x10001040, 0, 0x10041040, 0x41000, 0x41000, 4160,
        4160, 0x40040, 0x10000000, 0x10041000
    };

    public byte[] encrypt(byte key[], byte data[])
    {
        setKeys(key);
        byte val[] = new byte[8];
        int padding = 8 - data.length % 8;
        byte ebuf[] = new byte[data.length + padding];
        java.lang.System.arraycopy(data, 0, ebuf, 0, data.length);
        for(int i = data.length; i < ebuf.length; i++)
            ebuf[i] = (byte)padding;        for(int i = 0; i < ebuf.length / 8; i++)
        {
            for(int j = 0; j < 8; j++)
                val[j] = ebuf[i * 8 + j];            des_enc(val, 1);
            java.lang.System.arraycopy(val, 0, ebuf, i * 8, 8);
        }        return ebuf;
    }    public byte[] decrypt(byte key[], byte data[])
    {
        setKeys(key);
        byte val[] = new byte[8];
        byte buffer[] = new byte[data.length];
        for(int i = 0; i < data.length / 8; i++)
        {
            for(int j = 0; j < 8; j++)
                val[j] = data[i * 8 + j];            des_dec(val, 1);
            java.lang.System.arraycopy(val, 0, buffer, i * 8, 8);
        }        byte result[] = new byte[buffer.length - buffer[buffer.length - 1]];
        java.lang.System.arraycopy(buffer, 0, result, 0, result.length);
        return result;
    }    public byte[] encryptAll8BytesBlocks(byte value[], boolean only8bytes)
    {
        byte ebuf[] = new byte[8];
        byte evalue[] = new byte[value.length];
        for(int i = 0; i < value.length / 8; i++)
        {
            for(int j = 0; j < 8; j++)
                ebuf[j] ^= value[i * 8 + j];            des_enc(ebuf, 1);
            if(!only8bytes)
                java.lang.System.arraycopy(ebuf, 0, evalue, i * 8, 8);
        }        if(only8bytes)
            return ebuf;
        else
            return evalue;
    }    public void des_enc(byte data[], int blocks)
    {
        int work[] = new int[2];
        byte cp[] = data;
        for(int i = 0; i < blocks; i++)
        {
            scrunch(cp, work);
            desfunc(work, ek);
            unscrunch(work, cp);
        }    }    public void des_dec(byte data[], int blocks)
    {
        int work[] = new int[2];
        byte cp[] = data;
        for(int i = 0; i < blocks; i++)
        {
            scrunch(cp, work);
            desfunc(work, dk);
            unscrunch(work, cp);
        }    }    public void des_enc(byte key[], byte data[], int blocks)
    {
        int work[] = new int[2];
        byte cp[] = data;
        for(int i = 0; i < blocks; i++)
        {
            scrunch(cp, work);
            desfunc(work, deskey(key, (short)0));
            unscrunch(work, cp);
        }    }    public void des_dec(byte key[], byte data[], int blocks)
    {
        int work[] = new int[2];
        byte cp[] = data;
        for(int i = 0; i < blocks; i++)
        {
            scrunch(cp, work);
            desfunc(work, deskey(key, (short)1));
            unscrunch(work, cp);
        }    }    public void setKeys(byte key[])
    {
        ek = deskey(key, (short)0);
        dk = deskey(key, (short)1);
    }    private void setEncryptionKey(byte key[])
    {
        ek = deskey(key, (short)0);
    }    private void setDecryptionKey(byte key[])
    {
        dk = deskey(key, (short)1);
    }    private void nullKeys()
    {
        ek = null;
        dk = null;
    }    private void nullEncryptionKey()
    {
        ek = null;
    }    private void nullDecryptionKey()
    {
        dk = null;
    }    private int[] deskey(byte key[], short edf)
    {
        byte pc1m[] = new byte[56];
        byte pcr[] = new byte[56];
        int kn[] = new int[32];
        for(int j = 0; j < 56; j++)
        {
            int l = pc1[j];
            int m = l & 0x7;
            pc1m[j] = (byte)((key[l >> 3] & bytebit[m]) == 0 ? 0 : 1);
        }        for(int i = 0; i < 16; i++)
        {
            int m;
            if(edf == 1)
                m = 15 - i << 1;
            else
                m = i << 1;
            int n = m + 1;
            kn[m] = kn[n] = 0;
            for(int j = 0; j < 28; j++)
            {
                int l = j + totrot[i];
                if(l < 28)
                    pcr[j] = pc1m[l];
                else
                    pcr[j] = pc1m[l - 28];
            }            for(int j = 28; j < 56; j++)
            {
                int l = j + totrot[i];
                if(l < 56)
                    pcr[j] = pc1m[l];
                else
                    pcr[j] = pc1m[l - 28];
            }            for(int j = 0; j < 24; j++)
            {
                if(pcr[pc2[j]] != 0)
                    kn[m] |= bigbyte[j];
                if(pcr[pc2[j + 24]] != 0)
                    kn[n] |= bigbyte[j];
            }        }        return cookey(kn);
    }    private int[] cookey(int raw1[])
    {
        int dough[] = new int[32];
        int cook[] = dough;
        int raw0[] = raw1;
        int i = 0;
        int r0 = 0;
        int r1 = 0;
        int c = 0;
        while(i < 16)
        {
            r0 = r1++;
            cook[c] = (raw0[r0] & 0xfc0000) << 6;
            cook[c] |= (raw0[r0] & 0xfc0) << 10;
            cook[c] |= (raw1[r1] & 0xfc0000) >> 10;
            cook[c] |= (raw1[r1] & 0xfc0) >> 6;
            c++;
            cook[c] = (raw0[r0] & 0x3f000) << 12;
            cook[c] |= (raw0[r0] & 0x3f) << 16;
            cook[c] |= (raw1[r1] & 0x3f000) >> 4;
            cook[c] |= raw1[r1] & 0x3f;
            c++;
            i++;
            r1++;
        }
        return cook;
    }

    private void scrunch(byte outof[], int into[])
    {
        int i = 0;
        into[0] = (outof[i] & 0xff) << 24;
        i++;
        into[0] |= (outof[i] & 0xff) << 16;
        i++;
        into[0] |= (outof[i] & 0xff) << 8;
        i++;
        into[0] |= outof[i] & 0xff;
        i++;
        into[1] = (outof[i] & 0xff) << 24;
        i++;
        into[1] |= (outof[i] & 0xff) << 16;
        i++;
        into[1] |= (outof[i] & 0xff) << 8;
        i++;
        into[1] |= outof[i] & 0xff;
    }    private void unscrunch(int outof[], byte into[])
    {
        int i = 0;
        into[i] = (byte)(outof[0] >> 24 & 0xff);
        i++;
        into[i] = (byte)(outof[0] >> 16 & 0xff);
        i++;
        into[i] = (byte)(outof[0] >> 8 & 0xff);
        i++;
        into[i] = (byte)(outof[0] & 0xff);
        i++;
        into[i] = (byte)(outof[1] >> 24 & 0xff);
        i++;
        into[i] = (byte)(outof[1] >> 16 & 0xff);
        i++;
        into[i] = (byte)(outof[1] >> 8 & 0xff);
        i++;
        into[i] = (byte)(outof[1] & 0xff);
    }    private void desfunc(int block[], int keys[])
    {
        int i = 0;
        int k = 0;
        int leftt = block[0];
        int right = block[1];
        int work = (leftt >>> 4 ^ right) & 0xf0f0f0f;
        right ^= work;
        leftt ^= work << 4;
        work = (leftt >>> 16 ^ right) & 0xffff;
        right ^= work;
        leftt ^= work << 16;
        work = (right >>> 2 ^ leftt) & 0x33333333;
        leftt ^= work;
        right ^= work << 2;
        work = (right >>> 8 ^ leftt) & 0xff00ff;
        leftt ^= work;
        right ^= work << 8;
        right = (right << 1 | right >>> 31 & 0x1) & 0xffffffff;
        work = (leftt ^ right) & 0xaaaaaaaa;
        leftt ^= work;
        right ^= work;
        leftt = (leftt << 1 | leftt >>> 31 & 0x1) & 0xffffffff;
        for(int round = 0; round < 8; round++)
        {
            work = right << 28 | right >>> 4;
            long tempkeys = 0L;
            tempkeys = keys[k];
            work ^= keys[k];
            k++;
            int fval = sp7[work & 0x3f];
            fval |= sp5[work >>> 8 & 0x3f];
            fval |= sp3[work >>> 16 & 0x3f];
            fval |= sp1[work >>> 24 & 0x3f];
            work = right ^ keys[k];
            k++;
            fval |= sp8[work & 0x3f];
            fval |= sp6[work >>> 8 & 0x3f];
            fval |= sp4[work >>> 16 & 0x3f];
            fval |= sp2[work >>> 24 & 0x3f];
            leftt ^= fval;
            work = leftt << 28 | leftt >>> 4;
            work ^= keys[k];
            k++;
            fval = sp7[work & 0x3f];
            fval |= sp5[work >>> 8 & 0x3f];
            fval |= sp3[work >>> 16 & 0x3f];
            fval |= sp1[work >>> 24 & 0x3f];
            work = leftt ^ keys[k];
            k++;
            fval |= sp8[work & 0x3f];
            fval |= sp6[work >>> 8 & 0x3f];
            fval |= sp4[work >>> 16 & 0x3f];
            fval |= sp2[work >>> 24 & 0x3f];
            right ^= fval;
        }        right = right << 31 | right >>> 1;
        work = (leftt ^ right) & 0xaaaaaaaa;
        leftt ^= work;
        right ^= work;
        leftt = leftt << 31 | leftt >>> 1;
        work = (leftt >>> 8 ^ right) & 0xff00ff;
        right ^= work;
        leftt ^= work << 8;
        work = (leftt >>> 2 ^ right) & 0x33333333;
        right ^= work;
        leftt ^= work << 2;
        work = (right >>> 16 ^ leftt) & 0xffff;
        leftt ^= work;
        right ^= work << 16;
        work = (right >>> 4 ^ leftt) & 0xf0f0f0f;
        leftt ^= work;
        right ^= work << 4;
        block[0] = right;
        block[1] = leftt;
    }    //example
    public static void main(String[] args)
    {
        byte[] key = new byte[]{0x34, 0x23, 0x57, 0xf3, 0xb2, 0xc7, 0xd1, 0xa9};
        byte[] data = "test data".getBytes();
        DESCodec codec = new DESCodec();
        byte[] encodedData = codec.encrypt(key, data);
        byte[] decodedData = codec.decrypt(key, encodedData);
        String decodedStr = new String(decodedData);
        System.out.println(decodedStr);
    }
}

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