untbeatcode.~cpp

是用C++ Builder 写的DES加密算法.

//---------------------------------------------------------------------------


#pragma hdrstop

#include <string.h>
#include "untBeatCode.h"

//---------------------------------------------------------------------------

#pragma package(smart_init)

int p_aaaaa;

//////////////////////////////////////////////////////////////////////////
// Code starts from Line 130
//////////////////////////////////////////////////////////////////////////
bool Des_Go(unsigned char *Out, unsigned char *In, long datalen,
			const unsigned char *Key, int keylen, bool Type)
{
	long i, j;

    if( !( Out && In && Key && (datalen=(datalen+7)&0xfffffff8) ) ) 
		return false;
	SetKey(Key, keylen);
	if( !Is3DES ) {   // 1次DES
		for(i=0,j=datalen>>3; i<j; ++i,Out+=8,In+=8)
			DES(Out, In, &SubKey[0], Type);
	} else{   // 3次DES 加密:加(key0)-解(key1)-加(key0) 解密::解(key0)-加(key1)-解(key0)
		for(i=0,j=datalen>>3; i<j; ++i,Out+=8,In+=8) {
			DES(Out, In,  &SubKey[0], Type);
			DES(Out, Out, &SubKey[1], !Type);
			DES(Out, Out, &SubKey[0], Type);
		}
	}
	return true;
}

void SetKey(const unsigned char* Key, int len)
{
    memset(deskey, 0, 16);
    memcpy(deskey, Key, len>16?16:len);
	SetSubKey(&SubKey[0], &deskey[0]);
	Is3DES = len>8 ? (SetSubKey(&SubKey[1], &deskey[8]), true) : false;
}

void DES(char unsigned Out[8], char unsigned In[8], const PSubKey pSubKey, bool Type)
{
	int i;
    static bool M[64], tmp[32], *Li=&M[0], *Ri=&M[32];

    ByteToBit(M, In, 64);
    Transform(M, M, IP_Table, 64);
    if(Type == ENCRYPT)
    {
        for(i=0; i<16; ++i)
        {
            memcpy(tmp, Ri, 32);
            F_func(Ri, (*pSubKey)[i]);
            Xor(Ri, Li, 32);
            memcpy(Li, tmp, 32);
        }
    }
    else
    {
        for(i = 15; i >= 0; --i)
        {
            memcpy(tmp, Li, 32);
            F_func(Li, (*pSubKey)[i]);
            Xor(Li, Ri, 32);
            memcpy(Ri, tmp, 32);
        }
	}
    Transform(M, M, IPR_Table, 64);
    BitToByte(Out, M, 64);
}

void SetSubKey(PSubKey pSubKey, const unsigned char Key[8])
{
	int i;
    static bool K[64], *KL=&K[0], *KR=&K[28];

    ByteToBit(K, Key, 64);
    Transform(K, K, PC1_Table, 56);
    for(i=0; i<16; ++i) {
        RotateL(KL, 28, LOOP_Table[i]);
        RotateL(KR, 28, LOOP_Table[i]);
        Transform((*pSubKey)[i], K, PC2_Table, 48);
    }
}

void F_func(bool In[32], bool Ki[48])
{
    static bool MR[48];
    Transform(MR, In, E_Table, 48);
    Xor(MR, Ki, 48);
    S_func(In, MR);
    Transform(In, In, P_Table, 32);
}

void S_func(bool Out[32], bool In[48])
{
	unsigned char i, j, k;

    for(i = 0; i < 8; ++i,In+=6,Out+=4)
    {
        j = (In[0]<<1) + In[5];
        k = (In[1]<<3) + (In[2]<<2) + (In[3]<<1) + In[4];
		ByteToBit(Out, &S_Box[i][j][k], 4);
    }
}

void Transform(bool *Out, bool *In, const unsigned char *Table, int len)
{
	int i;

    for(i=0; i<len; ++i)
        Tmp[i] = In[ Table[i]-1 ];
    memcpy(Out, Tmp, len);
}

void Xor(bool *InA, bool *InB, int len)
{
	int i;

    for(i=0; i<len; ++i)
        InA[i] ^= InB[i];
}

void RotateL(bool *In, int len, int loop)
{
    memcpy(Tmp, In, loop);
    memcpy(In, In+loop, len-loop);
    memcpy(In+len-loop, Tmp, loop);
}

void ByteToBit(bool *Out, const unsigned char *In, int bits)
{
	int i;

    for(i=0; i<bits; ++i)
        Out[i] = (In[i>>3]>>(i&7)) & 1;
}

void BitToByte(unsigned char *Out, const bool *In, int bits)
{
	int i, j;

    memset(Out, 0, bits>>3);
    for(i = 0; i < bits; ++i)
    {
        Out[i>>3] |= In[i]<<(i&7);
    }
}