void test_merge_bit()
{
//01101100 010 3 1 结果输出100
//merge_bit(108, 2, 3, 1);
merge_bit(0x400, 0x13, 6, 2);
cout << hex << update_bit(0x400, 0x13, 2, 6) << endl;
}
void des(INT32 encry_flag,UCHAR *key,UCHAR *data,UCHAR *edata)
{
INT32 i, j;
UCHAR tmp_bit[64];
spilt_bit(key,8,key_bit);
spilt_bit(data,8,data_bit);
key_calculation(key_bit);
for (i=0;i<32;i++) { /* initial permutate */
data_lbit[i] = data_bit[des_ip[i]-1];
data_rbit[i] = data_bit[des_ip[i+32]-1];
}
switch (encry_flag) {
case 1: /* encry data */
for (i=0;i<16;i++) { /* L' = R, R' = L xor f(R,Kn) */
for (j=0;j<32;j++)
tmp_bit[j] = data_rbit[j];
f_cipher(data_rbit,key_k[i],frk_bit);
bit_xor(data_lbit,frk_bit,32,data_rbit);
for (j=0;j<32;j++)
data_lbit[j] = tmp_bit[j];
}
break;
default: /* decry data */
for (i=15;i>=0;i--) { /* L' = R, R' = L xor f(R,Kn) */
for (j=0;j<32;j++)
tmp_bit[j] = data_rbit[j];
f_cipher(data_rbit,key_k[i],frk_bit);
bit_xor(data_lbit,frk_bit,32,data_rbit);
for (j=0;j<32;j++)
data_lbit[j] = tmp_bit[j];
}
break;
}
for (i=0;i<32;i++) {
tmp_bit[i] = data_rbit[i];
tmp_bit[i+32] = data_lbit[i];
}
for (i=0;i<64;i++) /* inverse initial perm */
data_bit[i] = tmp_bit[des_rip[i]-1];
merge_bit(data_bit,8,edata);
}
