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unsigned long DES::SP1[64] = {
0x01010400L, 0x00000000L, 0x00010000L, 0x01010404L,
0x01010004L, 0x00010404L, 0x00000004L, 0x00010000L,
0x00000400L, 0x01010400L, 0x01010404L, 0x00000400L,
0x01000404L, 0x01010004L, 0x01000000L, 0x00000004L,
0x00000404L, 0x01000400L, 0x01000400L, 0x00010400L,
0x00010400L, 0x01010000L, 0x01010000L, 0x01000404L,
0x00010004L, 0x01000004L, 0x01000004L, 0x00010004L,
0x00000000L, 0x00000404L, 0x00010404L, 0x01000000L,
0x00010000L, 0x01010404L, 0x00000004L, 0x01010000L,
0x01010400L, 0x01000000L, 0x01000000L, 0x00000400L,
0x01010004L, 0x00010000L, 0x00010400L, 0x01000004L,
0x00000400L, 0x00000004L, 0x01000404L, 0x00010404L,
0x01010404L, 0x00010004L, 0x01010000L, 0x01000404L,
0x01000004L, 0x00000404L, 0x00010404L, 0x01010400L,
0x00000404L, 0x01000400L, 0x01000400L, 0x00000000L,
0x00010004L, 0x00010400L, 0x00000000L, 0x01010004L };
unsigned long DES::SP2[64] = {
0x80108020L, 0x80008000L, 0x00008000L, 0x00108020L,
0x00100000L, 0x00000020L, 0x80100020L, 0x80008020L,
0x80000020L, 0x80108020L, 0x80108000L, 0x80000000L,
0x80008000L, 0x00100000L, 0x00000020L, 0x80100020L,
0x00108000L, 0x00100020L, 0x80008020L, 0x00000000L,
0x80000000L, 0x00008000L, 0x00108020L, 0x80100000L,
0x00100020L, 0x80000020L, 0x00000000L, 0x00108000L,
0x00008020L, 0x80108000L, 0x80100000L, 0x00008020L,
0x00000000L, 0x00108020L, 0x80100020L, 0x00100000L,
0x80008020L, 0x80100000L, 0x80108000L, 0x00008000L,
0x80100000L, 0x80008000L, 0x00000020L, 0x80108020L,
0x00108020L, 0x00000020L, 0x00008000L, 0x80000000L,
0x00008020L, 0x80108000L, 0x00100000L, 0x80000020L,
0x00100020L, 0x80008020L, 0x80000020L, 0x00100020L,
0x00108000L, 0x00000000L, 0x80008000L, 0x00008020L,
0x80000000L, 0x80100020L, 0x80108020L, 0x00108000L };
unsigned long DES::SP3[64] = {
0x00000208L, 0x08020200L, 0x00000000L, 0x08020008L,
0x08000200L, 0x00000000L, 0x00020208L, 0x08000200L,
0x00020008L, 0x08000008L, 0x08000008L, 0x00020000L,
0x08020208L, 0x00020008L, 0x08020000L, 0x00000208L,
0x08000000L, 0x00000008L, 0x08020200L, 0x00000200L,
0x00020200L, 0x08020000L, 0x08020008L, 0x00020208L,
0x08000208L, 0x00020200L, 0x00020000L, 0x08000208L,
0x00000008L, 0x08020208L, 0x00000200L, 0x08000000L,
0x08020200L, 0x08000000L, 0x00020008L, 0x00000208L,
0x00020000L, 0x08020200L, 0x08000200L, 0x00000000L,
0x00000200L, 0x00020008L, 0x08020208L, 0x08000200L,
0x08000008L, 0x00000200L, 0x00000000L, 0x08020008L,
0x08000208L, 0x00020000L, 0x08000000L, 0x08020208L,
0x00000008L, 0x00020208L, 0x00020200L, 0x08000008L,
0x08020000L, 0x08000208L, 0x00000208L, 0x08020000L,
0x00020208L, 0x00000008L, 0x08020008L, 0x00020200L };
unsigned long DES::SP4[64] = {
0x00802001L, 0x00002081L, 0x00002081L, 0x00000080L,
0x00802080L, 0x00800081L, 0x00800001L, 0x00002001L,
0x00000000L, 0x00802000L, 0x00802000L, 0x00802081L,
0x00000081L, 0x00000000L, 0x00800080L, 0x00800001L,
0x00000001L, 0x00002000L, 0x00800000L, 0x00802001L,
0x00000080L, 0x00800000L, 0x00002001L, 0x00002080L,
0x00800081L, 0x00000001L, 0x00002080L, 0x00800080L,
0x00002000L, 0x00802080L, 0x00802081L, 0x00000081L,
0x00800080L, 0x00800001L, 0x00802000L, 0x00802081L,
0x00000081L, 0x00000000L, 0x00000000L, 0x00802000L,
0x00002080L, 0x00800080L, 0x00800081L, 0x00000001L,
0x00802001L, 0x00002081L, 0x00002081L, 0x00000080L,
0x00802081L, 0x00000081L, 0x00000001L, 0x00002000L,
0x00800001L, 0x00002001L, 0x00802080L, 0x00800081L,
0x00002001L, 0x00002080L, 0x00800000L, 0x00802001L,
0x00000080L, 0x00800000L, 0x00002000L, 0x00802080L };
unsigned long DES::SP5[64] = {
0x00000100L, 0x02080100L, 0x02080000L, 0x42000100L,
0x00080000L, 0x00000100L, 0x40000000L, 0x02080000L,
0x40080100L, 0x00080000L, 0x02000100L, 0x40080100L,
0x42000100L, 0x42080000L, 0x00080100L, 0x40000000L,
0x02000000L, 0x40080000L, 0x40080000L, 0x00000000L,
0x40000100L, 0x42080100L, 0x42080100L, 0x02000100L,
0x42080000L, 0x40000100L, 0x00000000L, 0x42000000L,
0x02080100L, 0x02000000L, 0x42000000L, 0x00080100L,
0x00080000L, 0x42000100L, 0x00000100L, 0x02000000L,
0x40000000L, 0x02080000L, 0x42000100L, 0x40080100L,
0x02000100L, 0x40000000L, 0x42080000L, 0x02080100L,
0x40080100L, 0x00000100L, 0x02000000L, 0x42080000L,
0x42080100L, 0x00080100L, 0x42000000L, 0x42080100L,
0x02080000L, 0x00000000L, 0x40080000L, 0x42000000L,
0x00080100L, 0x02000100L, 0x40000100L, 0x00080000L,
0x00000000L, 0x40080000L, 0x02080100L, 0x40000100L };
unsigned long DES::SP6[64] = {
0x20000010L, 0x20400000L, 0x00004000L, 0x20404010L,
0x20400000L, 0x00000010L, 0x20404010L, 0x00400000L,
0x20004000L, 0x00404010L, 0x00400000L, 0x20000010L,
0x00400010L, 0x20004000L, 0x20000000L, 0x00004010L,
0x00000000L, 0x00400010L, 0x20004010L, 0x00004000L,
0x00404000L, 0x20004010L, 0x00000010L, 0x20400010L,
0x20400010L, 0x00000000L, 0x00404010L, 0x20404000L,
0x00004010L, 0x00404000L, 0x20404000L, 0x20000000L,
0x20004000L, 0x00000010L, 0x20400010L, 0x00404000L,
0x20404010L, 0x00400000L, 0x00004010L, 0x20000010L,
0x00400000L, 0x20004000L, 0x20000000L, 0x00004010L,
0x20000010L, 0x20404010L, 0x00404000L, 0x20400000L,
0x00404010L, 0x20404000L, 0x00000000L, 0x20400010L,
0x00000010L, 0x00004000L, 0x20400000L, 0x00404010L,
0x00004000L, 0x00400010L, 0x20004010L, 0x00000000L,
0x20404000L, 0x20000000L, 0x00400010L, 0x20004010L };
unsigned long DES::SP7[64] = {
0x00200000L, 0x04200002L, 0x04000802L, 0x00000000L,
0x00000800L, 0x04000802L, 0x00200802L, 0x04200800L,
0x04200802L, 0x00200000L, 0x00000000L, 0x04000002L,
0x00000002L, 0x04000000L, 0x04200002L, 0x00000802L,
0x04000800L, 0x00200802L, 0x00200002L, 0x04000800L,
0x04000002L, 0x04200000L, 0x04200800L, 0x00200002L,
0x04200000L, 0x00000800L, 0x00000802L, 0x04200802L,
0x00200800L, 0x00000002L, 0x04000000L, 0x00200800L,
0x04000000L, 0x00200800L, 0x00200000L, 0x04000802L,
0x04000802L, 0x04200002L, 0x04200002L, 0x00000002L,
0x00200002L, 0x04000000L, 0x04000800L, 0x00200000L,
0x04200800L, 0x00000802L, 0x00200802L, 0x04200800L,
0x00000802L, 0x04000002L, 0x04200802L, 0x04200000L,
0x00200800L, 0x00000000L, 0x00000002L, 0x04200802L,
0x00000000L, 0x00200802L, 0x04200000L, 0x00000800L,
0x04000002L, 0x04000800L, 0x00000800L, 0x00200002L };
unsigned long DES::SP8[64] = {
0x10001040L, 0x00001000L, 0x00040000L, 0x10041040L,
0x10000000L, 0x10001040L, 0x00000040L, 0x10000000L,
0x00040040L, 0x10040000L, 0x10041040L, 0x00041000L,
0x10041000L, 0x00041040L, 0x00001000L, 0x00000040L,
0x10040000L, 0x10000040L, 0x10001000L, 0x00001040L,
0x00041000L, 0x00040040L, 0x10040040L, 0x10041000L,
0x00001040L, 0x00000000L, 0x00000000L, 0x10040040L,
0x10000040L, 0x10001000L, 0x00041040L, 0x00040000L,
0x00041040L, 0x00040000L, 0x10041000L, 0x00001000L,
0x00000040L, 0x10040040L, 0x00001000L, 0x00041040L,
0x10001000L, 0x00000040L, 0x10000040L, 0x10040000L,
0x10040040L, 0x10000000L, 0x00040000L, 0x10001040L,
0x00000000L, 0x10041040L, 0x00040040L, 0x10000040L,
0x10040000L, 0x10001000L, 0x10001040L, 0x00000000L,
0x10041040L, 0x00041000L, 0x00041000L, 0x00001040L,
0x00001040L, 0x00040040L, 0x10000000L, 0x10041000L };
接下来我们举例说明如何使用DES类。首先定义一个Encrypt类：
//Encrypt.h
#include "des.h"
#include "Base64.h"
class Encrypt{
public :
char* encrypt ( unsigned char key[8], char* data);
char* decrypt ( unsigned char key[8], char* data);
CBase64 base;
};
而后是具体的实现：
//Encrypt.cpp
#include "Encrypt.h"
#include <stdio.h>
char* Encrypt::encrypt ( unsigned char key[8], char* data)
{
//将字符指针转化为字符数组
char* datavv = data;
data =(char *) calloc(100,1);
memcpy(data,datavv,strlen(datavv));
data[strlen(data)] = '\0';
//DES加密
DES des ;
des.encrypt(key,(unsigned char *)data,1);
//base64编码
base.Encode(data);
char* res =(char *) base.EncodedMessage();
return res;
};
char* Encrypt::decrypt ( unsigned char key[8], char* data)
{
//base64解码
base.Decode(data);
char* datares=(char *) base.DecodedMessage();
//将字符指针转化为字符数组
char* datarea = datares;
datares = (char *)malloc(256);
memcpy(datares,datarea,strlen(datarea));
datares[strlen(datarea)] = '\0';
//DES解密
DES des ;
des.decrypt(key,(unsigned char*) datares,1);
return datares;
};
注意，这里使用了BASE 64编码。其实现代码如下：
// Base64.h
#include <windows.h>
class CBase64
{
// Internal bucket class.
class TempBucket
{
public:
BYTE nData[4];
BYTE nSize;
void Clear() { ::ZeroMemory(nData, 4); nSize = 0; };
};
PBYTE m_pDBuffer;
PBYTE m_pEBuffer;
DWORD m_nDBufLen;
DWORD m_nEBufLen;
DWORD m_nDDataLen;
DWORD m_nEDataLen;
public:
CBase64();
virtual ~CBase64();
public:
virtual void Encode(const PBYTE, DWORD);
virtual void Decode(const PBYTE, DWORD);
virtual void Encode(LPCSTR sMessage);
virtual void Decode(LPCSTR sMessage);
virtual LPCSTR DecodedMessage() const;
virtual LPCSTR EncodedMessage() const;
virtual void AllocEncode(DWORD);
virtual void AllocDecode(DWORD);
virtual void SetEncodeBuffer(const PBYTE pBuffer, DWORD nBufLen);
virtual void SetDecodeBuffer(const PBYTE pBuffer, DWORD nBufLen);
protected:
virtual void _EncodeToBuffer(const TempBucket &Decode, PBYTE pBuffer);
virtual ULONG _DecodeToBuffer(const TempBucket &Decode, PBYTE pBuffer);
virtual void _EncodeRaw(TempBucket &, const TempBucket &);
virtual void _DecodeRaw(TempBucket &, const TempBucket &);
virtual BOOL _IsBadMimeChar(BYTE);
static char m_DecodeTable[256];
static BOOL m_Init;
void _Init();
};
////////////////////////////////////
//CBase64.cpp
// CBase64.cpp: implementation of the CBase64 class.
//
//////////////////////////////////////////////////////////////////////
#include "Base64.h"
// Digits...
static char Base64Digits[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
BOOL CBase64::m_Init = FALSE;
char CBase64::m_DecodeTable[256];
#ifndef PAGESIZE
#define PAGESIZE 4096
#endif
#ifndef ROUNDTOPAGE
#define ROUNDTOPAGE(a) (((a/4096)+1)*4096)
#endif
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CBase64::CBase64()
: m_pDBuffer(NULL),
m_pEBuffer(NULL),
m_nDBufLen(0),
m_nEBufLen(0)
{
}
CBase64::~CBase64()
{
if(m_pDBuffer != NULL)
delete [] m_pDBuffer;
if(m_pEBuffer != NULL)
delete [] m_pEBuffer;
}
LPCSTR CBase64::DecodedMessage() const
{
return (LPCSTR) m_pDBuffer;
}
LPCSTR CBase64::EncodedMessage() const
{
return (LPCSTR) m_pEBuffer;
}
void CBase64::AllocEncode(DWORD nSize)
{
if(m_nEBufLen < nSize)
{
if(m_pEBuffer != NULL)
delete [] m_pEBuffer;
m_nEBufLen = ROUNDTOPAGE(nSize);
m_pEBuffer = new BYTE[m_nEBufLen];
}
::ZeroMemory(m_pEBuffer, m_nEBufLen);
m_nEDataLen = 0;
}
void CBase64::AllocDecode(DWORD nSize)
{
if(m_nDBufLen < nSize)
{
if(m_pDBuffer != NULL)
delete [] m_pDBuffer;
m_nDBufLen = ROUNDTOPAGE(nSize);
m_pDBuffer = new BYTE[m_nDBufLen];
}
::ZeroMemory(m_pDBuffer, m_nDBufLen);
m_nDDataLen = 0;
}
void CBase64::SetEncodeBuffer(const PBYTE pBuffer, DWORD nBufLen)
{
DWORD ii = 0;
AllocEncode(nBufLen);
while(ii < nBufLen)
{
if(!_IsBadMimeChar(pBuffer[ii]))
{
m_pEBuffer[m_nEDataLen] = pBuffer[ii];
m_nEDataLen++;
}
ii++;
}
}
void CBase64::SetDecodeBuffer(const PBYTE pBuffer, DWORD nBufLen)
{
AllocDecode(nBufLen);
::CopyMemory(m_pDBuffer, pBuffer, nBufLen);
m_nDDataLen = nBufLen;
}
void CBase64::Encode(const PBYTE pBuffer, DWORD nBufLen)
{
SetDecodeBuffer(pBuffer, nBufLen);
AllocEncode(nBufLen * 2);
TempBucket Raw;
DWORD nIndex = 0;
while((nIndex + 3) <= nBufLen)
{
Raw.Clear();
::CopyMemory(&Raw, m_pDBuffer + nIndex, 3);
Raw.nSize = 3;
_EncodeToBuffer(Raw, m_pEBuffer + m_nEDataLen);
nIndex += 3;
m_nEDataLen += 4;
}
if(nBufLen > nIndex)
{
Raw.Clear();
Raw.nSize = (BYTE) (nBufLen - nIndex);
::CopyMemory(&Raw, m_pDBuffer + nIndex, nBufLen - nIndex);
_EncodeToBuffer(Raw, m_pEBuffer + m_nEDataLen);
m_nEDataLen += 4;
}
}
void CBase64::Encode(LPCSTR szMessage)
{
if(szMessage != NULL)
CBase64::Encode((const PBYTE)szMessage, lstrlenA(szMessage));
}
void CBase64::Decode(const PBYTE pBuffer, DWORD dwBufLen)
{
if(!CBase64::m_Init)
_Init();
SetEncodeBuffer(pBuffer, dwBufLen);
AllocDecode(dwBufLen);
TempBucket Raw;
DWORD nIndex = 0;
while((nIndex + 4) <= m_nEDataLen)
{
Raw.Clear();
Raw.nData[0] = CBase64::m_DecodeTable[m_pEBuffer[nIndex]];
Raw.nData[1] = CBase64::m_DecodeTable[m_pEBuffer[nIndex + 1]];
Raw.nData[2] = CBase64::m_DecodeTable[m_pEBuffer[nIndex + 2]];
Raw.nData[3] = CBase64::m_DecodeTable[m_pEBuffer[nIndex + 3]];
if(Raw.nData[2] == 255)
Raw.nData[2] = 0;
if(Raw.nData[3] == 255)
Raw.nData[3] = 0;
Raw.nSize = 4;
_DecodeToBuffer(Raw, m_pDBuffer + m_nDDataLen);
nIndex += 4;
m_nDDataLen += 3;
}
// If nIndex < m_nEDataLen, then we got a decode message without padding.
// We may want to throw some kind of warning here, but we are still required
// to handle the decoding as if it was properly padded.
if(nIndex < m_nEDataLen)
{
Raw.Clear();
for(DWORD ii = nIndex; ii < m_nEDataLen; ii++)
{
Raw.nData[ii - nIndex] = CBase64::m_DecodeTable[m_pEBuffer[ii]];
Raw.nSize++;
if(Raw.nData[ii - nIndex] == 255)
Raw.nData[ii - nIndex] = 0;
}
_DecodeToBuffer(Raw, m_pDBuffer + m_nDDataLen);
m_nDDataLen += (m_nEDataLen - nIndex);
}
}
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