📄 des.java
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}//移位完成
/*把ci与di重新组合*/
for(k=0;k<=27;k++)
{
oldKey_byte2[k]=oldkey_c[k];
}
for(k=28;k<=55;k++)
{
oldKey_byte2[k]=oldkey_d[k-28];
}//组合完成
/*根据置换选择函数pc-2生成子密钥ki*/
for(k=0;k<48;k++)
{
newKey_byte[i][k]=oldKey_byte2[s.pc_2[k]-1];
}//生成一次子密钥
}// 已生成16个48位子密钥(此时一个字符代表一位)
//把一个字符转换为一位
for(i=0;i<16;i++)
{
newKey[i]=s.byteToBit(newKey_byte[i]);
}
return newKey;
}//生成子密钥完成
char[] s_Box(char[] s_bit)//输入48位数
{ //换位表p
int[] p = {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
} ;
//选择函数S盒依据表
int[][] 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}
};
int[][] 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}
};
int[][] 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}
};
int[][] 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}
};
int[][] 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}
};
int[][] 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}
};
int[][] 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}
};
int[][] 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}
};
des s=new des();
char[] s_byte=new char[64] ;
char[] s_byte1=new char[64];
char[] s_out_bit=new char[8];
char[] s_out_bit1=new char[4];
char[] s_bit_temp = {'\u0000','\u0000','\u0000','\u0000'} ;
int i,j,row,col;
for(i=0;i<=63;i++) s_byte[i] = '\u0000' ;
for(i=0;i<=63;i++) s_byte1[i] ='\u0000' ;
s_byte=s.bitToByte(s_bit);
for(i=0;i<=7;i++)
{
for(j=0;j<=63;j++)
s_byte1[j] = '\u0000';/*clear temp*/
s_byte1[14] = s_byte[i*6] ; /*get bit 0 in 6 bit*/
s_byte1[15] = s_byte[i*6+5] ;/*get bit 5 in 6 bit*/
s_bit_temp=s.byteToBit(s_byte1) ;/* 0000 00?? */
row =(short)s_bit_temp[0] ;/*get row[i]*/
for(j=0;j<=63;j++)
s_byte1[j] = '\u0000' ;/*clear temp*/
s_byte1[12] = s_byte[i*6+1] ;/*0000 ????*/
s_byte1[13] = s_byte[i*6+2] ;
s_byte1[14] = s_byte[i*6+3] ;
s_byte1[15] = s_byte[i*6+4] ;
s_bit_temp=s.byteToBit(s_byte1) ;
col =(short)s_bit_temp[0] ;/*get column in S table*/
/*get number from S table with row and col*/
switch (i)
{
case 0 :
s_out_bit[i] = (char)s1[row][col] ;
break ;
case 1 :
s_out_bit[i] = (char)s2[row][col] ;
break ;
case 2 :
s_out_bit[i] = (char)s3[row][col] ;
break ;
case 3 :
s_out_bit[i] = (char)s4[row][col] ;
break ;
case 4 :
s_out_bit[i] = (char)s5[row][col] ;
break ;
case 5 :
s_out_bit[i] = (char)s6[row][col] ;
break ;
case 6 :
s_out_bit[i] = (char)s7[row][col] ;
break ;
case 7 :
s_out_bit[i] = (char)s8[row][col] ;
break ;
} ;
} /*s_out_bit[0-7]:0000???? 0000???? 0000???? 0000????...0000???? */
/*change 64bit to 32bit : clean 0000(high 4bit)*/
s_out_bit1[0] = (char)(((short)(s_out_bit[0]<<12)) + ((short)(s_out_bit[1]<<8))+((short)(s_out_bit[2]<<4))+((short)(s_out_bit[3]))) ;
s_out_bit1[1] = (char)(((short)(s_out_bit[4]<<12)) + ((short)(s_out_bit[5]<<8))+((short)(s_out_bit[6]<<4))+((short)(s_out_bit[7]))) ;
for(i=0;i<=63;i++) s_byte[i] = '\u0000' ;
for(i=0;i<=63;i++) s_byte1[i] ='\u0000' ;
s_byte =s.bitToByte(s_out_bit1) ;/*change byte for P swap bit*/
for(i=0;i<=31;i++) s_byte1[i] = s_byte[p[i] - 1] ;/*goto P swap bit*/
for(i=0;i<=3;i++) s_bit[i] ='\u0000' ;
s_bit=s.byteToBit(s_byte1) ;//32位
return s_bit;
/*now ! we got 32bit f(R,K)*/
}
char[] encryption(char[] m_bit ,char[] k_bit)//输入64位明文，64位密钥，输出64位密文
{
char[] m_bit1 =new char[4];
char[] m_byte =new char[64] ;
char[] m_byte1=new char[64] ;
char[][] key_n=new char[16][4] ;
char[][] l_bit=new char[17][4] ;
char[][] r_bit=new char[17][4] ;
char[] e_byte=new char[64] ;
char[] e_byte1=new char[64] ;
char[] r_byte=new char[64] ;
char[] r_byte1=new char[64] ;
char[] e_bit=new char[4];
int i,j;
des e=new des();
key_n=e.subKey(k_bit);//生成子密钥
m_byte=e.bitToByte(m_bit);
for(i=0;i<=63;i++)
m_byte1[i] = m_byte[e.ip[i] - 1] ;/*goto IP swap bit*/
m_bit1=e.byteToBit(m_byte1);;/*re-change to bit*/
for(i=0;i<=1;i++)
l_bit[0][i] = m_bit1[i] ;/*move left 32bit -> l0*/
for(i=2;i<=3;i++)
r_bit[0][i - 2] = m_bit1[i] ;/*move right 32bit -> r0*/
for(i=1;i<=16;i++) /*16 layer*/
{
for(j=0;j<=1;j++) l_bit[i][j] = r_bit[i-1][j] ;/*L(n) = R(n-1)*/
/*comput f(R(n-1),k)*/
r_byte=e.bitToByte(r_bit[i-1]);
for(j=0;j<=47;j++)
r_byte1[j] = r_byte[e.e[j] - 1] ;/*goto E swap bit*/
r_bit[i-1]=e.byteToBit(r_byte1) ;/*now r_bit is 48bit*/
/*xor 48bit key*/
for(j=0;j<=2;j++)
r_bit[i-1][j] = (char)(((short)r_bit[i-1][j]) ^((short) key_n[i-1][j])) ;
/*goto <S_box> and <P swap bit>*/
r_bit[i-1]=e.s_Box(r_bit[i-1]);/*change 48bit r_bit[i-1]->32bit r_bit[i-1]*/
for(j=0;j<=1;j++)/*get next r_bit*/
{
r_bit[i][j] = (char)(((short)l_bit[i-1][j]) ^ ((short)r_bit[i-1][j])) ;/*f(R(n-1),k)*/
}
}/*end of encryption*/
for(i=0;i<=1;i++) e_bit[i] = r_bit[16][i] ;
for(i=2;i<=3;i++) e_bit[i] = l_bit[16][i - 2] ;
/*r_bit + l_bit -> e_bit(64bit)*/
e_byte=e.bitToByte(e_bit);/*change to byte for swap bit IP-1*/
for(i=0;i<=63;i++)
e_byte1[i] = e_byte[e.ip_1[i] - 1] ;/*goto IP-1 swap bit*/
e_bit=e.byteToBit(e_byte1);/*got e_bit*/
return e_bit;
}
char[] uncryption(char[] m_bit ,char[] k_bit)//输入64位密文，64位密钥，输出64位明文
{
char[] m_bit1 ={'\u0000','\u0000','\u0000','\u0000'};
char[] m_byte =new char[64] ;
char[] m_byte1=new char[64] ;
char[][] key_n=new char[16][4] ;
char[][] l_bit=new char[17][4] ;
char[][] r_bit=new char[17][4] ;
char[] e_byte=new char[64] ;
char[] e_byte1=new char[64] ;
char[] l_byte=new char[64] ;
char[] l_byte1=new char[64] ;
char[] e_bit=new char[4];
int i,j;
des e=new des();
key_n=e.subKey(k_bit);//生成子密钥
m_byte=e.bitToByte(m_bit);
for(i=0;i<=63;i++)
m_byte1[i] = m_byte[e.ip[i] - 1] ;/*goto IP swap bit*/
m_bit1=e.byteToBit(m_byte1);;/*re-change to bit*/
for(i=0;i<=1;i++)
r_bit[16][i] = m_bit1[i] ;/*move left 32bit -> r16*/
for(i=2;i<=3;i++)
l_bit[16][i - 2] = m_bit1[i] ;/*move right 32bit -> l16*/
for(i=16;i>=1;i--) /*16 layer*/
{
for(j=0;j<=1;j++) r_bit[i-1][j] = l_bit[i][j] ;/*R(n-1) = L(n)*/
/*comput f(L(n),k)*/
l_byte=e.bitToByte(l_bit[i]);
for(j=0;j<=47;j++)
l_byte1[j] = l_byte[e.e[j] - 1] ;/*goto E swap bit*/
l_bit[i]=e.byteToBit(l_byte1) ;/*now r_bit is 48bit*/
/*xor 48bit key*/
for(j=0;j<=2;j++)
l_bit[i][j] = (char)(((short)l_bit[i][j]) ^((short) key_n[i-1][j])) ;
/*goto <S_box> and <P swap bit>*/
l_bit[i]=e.s_Box(l_bit[i]);/*change 48bit l_bit[i]->32bit l_bit[i]*/
for(j=0;j<=1;j++)/*get PREV l_bit*/
{
l_bit[i-1][j] = (char)(((short)r_bit[i][j]) ^ ((short)l_bit[i][j])) ;/*f(L(n),k)*/
}
}/*end of uncryption*/
for(i=0;i<=1;i++) e_bit[i] = l_bit[0][i] ;
for(i=2;i<=3;i++) e_bit[i] = r_bit[0][i - 2] ;
/*r_bit + l_bit -> e_bit(64bit)*/
e_byte=e.bitToByte(e_bit);/*change to byte for swap bit IP-1*/
for(i=0;i<=63;i++)
e_byte1[i] = e_byte[e.ip_1[i] - 1] ;/*goto IP-1 swap bit*/
e_bit=e.byteToBit(e_byte1);/*got e_bit*/
return e_bit;
}
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