DES加密 c++ C#

#pragma once
class MyDES
{
public:
MyDES(void);
~MyDES(void);
public:  
BYTE bOriMsg[8] ;               // 初始消息 ( 64 bit )  
BYTE LMsg[17][4], RMsg[17][4] ; // 中间变量L0-->L16,R0-->R16 ( 32 bit )  
BYTE bKey[8] ;                  // 保存密钥 ( 64 bit )  
BYTE bSubKey[17][6] ;           // 保存子密钥K1-->K16 ( 48 bit )  
BYTE bCryptedMsg[8] ;           // 密文  
public:  
void DES_Encrypt ( ) ;  
void DES_Decrypt ( ) ;  
BOOL DES_Encrypt ( LPBYTE lpSour, LPBYTE lpDest, UINT uLen, LPBYTE lpKey ) ;  
BOOL DES_Decrypt ( LPBYTE lpSour, LPBYTE lpDest, UINT uLen, LPBYTE lpKey ) ;  
public:  
// 初始置换  
void DESInitSwap ( ) ;  
// 初始逆置换  
void DESInitReSwap () ;  
// 产生子密钥  
void DESGenSubKey ( ) ;  
// DES的单轮加密过程  
void DESSingleTurn ( BYTE nTurnIndex, BOOL bMode ) ;  
// DES的F函数  
void DES_f ( BYTE bTurnIndex, BOOL bMode ) ;  
public:  
// 初始化  
void DES_SysInit () ;   
// 设置明文  
void DES_SetOriMsg ( PBYTE pMsg, UINT uLen ) ;  
// 设置密钥  
void DES_SetKey ( PBYTE pKey, UINT uLen ) ;  
};

#include "StdAfx.h"
#include "MyDES.h"




MyDES::MyDES(void)
{
}




MyDES::~MyDES(void)
{
} 
// 初始置换表 (IP)  
static BYTE bInitSwapTable[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  
} ;  
// 初始逆置换表 (IP-1)  
static BYTE bInitReSwapTable[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  
} ;  
// 位扩展表32-->48 (E)  
static BYTE bBitExternTable[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,  1  
} ;  
// 32位置换表--用于F的尾置换 (P)  
static BYTE bTailSwapTable[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  
} ;  
// 8个S盒 (S)  
static BYTE SB[8][4][16] = {  
{  
14, 4, 13, 1, 1, 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  
},  


{  
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  
},  


{  
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  
},  


{  
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  
},  


{  
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  
},  


{  
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  
},  


{  
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  
},  


{  
13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 13, 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  
}  
} ;  
// 置换选择表一 (PC-1)  
static BYTE bSelSwapTable_1[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  
} ;  
// 置换选择表二 (PC-2)  
static BYTE bSelSwapTable_2[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  
} ;  
// 位掩码表  
static BYTE bBitMask[8] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 } ;  
//  
// DES加密  
//  
void MyDES::DES_Encrypt ( )  
{  
this->DES_SysInit() ;  
this->DESGenSubKey () ;  
this->DESInitSwap () ;  
for ( BYTE i = 1; i <= 16; i++ )  
this->DESSingleTurn ( i, true ) ;  
this->DESInitReSwap () ;  
}  
//  
// DES解密  
//  
void MyDES::DES_Decrypt ( )  
{  
this->DES_SysInit() ;  
this->DESGenSubKey () ;  
this->DESInitSwap () ;  
for ( BYTE i = 1; i <= 16; i++ )  
this->DESSingleTurn ( i, false ) ;  
this->DESInitReSwap () ;  
}  
//  
// DES加密  
//  
BOOL MyDES::DES_Encrypt ( LPBYTE lpSour, LPBYTE lpDest, UINT uLen, LPBYTE lpKey )  
{  
if ( ( uLen & 7 ) > 0 )  
return FALSE ;  
memset ( this->bKey, 0, sizeof(this->bKey) ) ;  
memcpy ( this->bKey, lpKey, 8 ) ;  
this->DESGenSubKey () ;  
UINT nCurLen ;  
for ( nCurLen = 0; nCurLen < uLen; nCurLen += 8 )  
{  
memset ( this->bOriMsg, 0, sizeof(this->bOriMsg) ) ;  
memcpy ( this->bOriMsg, &(lpSour[nCurLen]), 8 ) ;  
this->DESInitSwap () ;  
for ( BYTE i = 1; i <= 16; i++ )  
this->DESSingleTurn ( i, true ) ;  
this->DESInitReSwap () ;  
memcpy ( &(lpDest[nCurLen]), this->bCryptedMsg, 8 ) ;  
this->DES_SysInit() ;  
}  
return TRUE ;  
}  
//  
// DES解密  
//  
BOOL MyDES::DES_Decrypt  ( LPBYTE lpSour, LPBYTE lpDest, UINT uLen, LPBYTE lpKey )  
{  
if ( ( uLen & 7 ) > 0 )  
return FALSE ;  
memset ( this->bKey, 0, sizeof(this->bKey) ) ;  
memcpy ( this->bKey, lpKey, 8 ) ;  
this->DESGenSubKey () ;  
UINT nCurLen ;  
for ( nCurLen = 0; nCurLen < uLen; nCurLen += 8 )  
{  
memset ( this->bOriMsg, 0, sizeof(this->bOriMsg) ) ;  
memcpy ( this->bOriMsg, &(lpSour[nCurLen]), 8 ) ;  
this->DESInitSwap () ;  
for ( BYTE i = 1; i <= 16; i++ )  
this->DESSingleTurn ( i, false ) ;  
this->DESInitReSwap () ;  
memcpy ( &(lpDest[nCurLen]), this->bCryptedMsg, 8 ) ;  
this->DES_SysInit() ;  
}  
return TRUE ;  
}  
//  
// 初始置换  
//  
void MyDES::DESInitSwap ( )  
{  
// R[16]-L[16] 构成64位，经初始逆置换  
for ( UINT i = 0; i < 32; i++ )  
{  
if ( bOriMsg[(bInitSwapTable[i]-1)>>3] & bBitMask[(~(bInitSwapTable[i]-1))&7] )  
this->LMsg[0][i>>3] |= bBitMask[(~i)&7] ;  
else  
this->LMsg[0][i>>3] &= ( ~(bBitMask[(~i)&7]) );  
if ( bOriMsg[(bInitSwapTable[i+32]-1)>>3] & bBitMask[(~(bInitSwapTable[i+32]-1))&7] )  
this->RMsg[0][i>>3] |= bBitMask[(~i)&7] ;  
else  
this->RMsg[0][i>>3] &= ( ~(bBitMask[(~i)&7]) );  
}  
}  
//   
// 初始逆置换  
//  
void MyDES::DESInitReSwap ()  
{  
// R[16]-L[16] 构成64位，经初始逆置换  
for ( UINT i = 0; i < 64; i++ )  
{  
if ( bInitReSwapTable[i] <= 32 )  
{  
if ( RMsg[16][(bInitReSwapTable[i]-1)>>3] & bBitMask[(~(bInitReSwapTable[i]-1))&7] )  
this->bCryptedMsg[i>>3] |= bBitMask[(~i)&7] ;  
else  
this->bCryptedMsg[i>>3] &= ( ~(bBitMask[(~i)&7]) ) ;  
}  
else  
{  
if ( LMsg[16][(bInitReSwapTable[i]-32-1)>>3] & bBitMask[(~(bInitReSwapTable[i]-32-1))&7] )  
this->bCryptedMsg[i>>3] |= bBitMask[(~i)&7] ;  
else  
this->bCryptedMsg[i>>3] &= ( ~(bBitMask[(~i)&7]) ) ;  
}  
}  
}  
//  
// 产生子密钥  
//  
void MyDES::DESGenSubKey ( )  
{  
memset ( this->bSubKey, 0, sizeof(this->bSubKey) ) ;  
// 置换选择一  
UINT i ;  
BYTE bByteIndex, bBitIndex, bTemp[7] = {0} ;  
for ( i = 0; i < 56; i++ )  
{  
bByteIndex  = ( bSelSwapTable_1[i] - 1 ) / 8 ;  
bBitIndex   = 7 - ( bSelSwapTable_1[i] - 1 ) % 8 ;  
if ( this->bKey[bByteIndex] & bBitMask[bBitIndex] )  
bTemp[i>>3] |= bBitMask[(~i)&7] ;  
}  
// 产生子密钥过程  
BYTE bTempKey[7] = {0} ;  
for ( UINT uTurn = 1; uTurn <= 16; uTurn ++ )  
{  
UINT bShiftBit = 2 ;  
if ( uTurn == 1 || uTurn == 2 || uTurn == 9 || uTurn == 16 )  
bShiftBit = 1 ;  
// 循环移位  
for ( i = bShiftBit; i < (28+bShiftBit); i++ )  
{  
if ( bTemp[(i%28)>>3] & bBitMask[(~(i%28))&7] )  
bTempKey[(i-bShiftBit)>>3] |= bBitMask[(~(i-bShiftBit))&7] ;  
if ( bTemp[(i%28+28)>>3] & bBitMask[(~(i%28+28))&7] )  
bTempKey[(i+28-bShiftBit)>>3] |= bBitMask[(~(i+28-bShiftBit))&7] ;  
}  
// 置换选择二  
for ( i = 0; i < 48; i++ )  
{  
bByteIndex  = ( bSelSwapTable_2[i] - 1 ) / 8 ;  
bBitIndex   = 7 - ( bSelSwapTable_2[i] - 1 ) % 8 ;  
if ( bTempKey[bByteIndex] & bBitMask[bBitIndex] )  
this->bSubKey[uTurn][i>>3] |= bBitMask[(~i)&7] ;  
}  
//cout << "turn " << uTurn << "/t :  " ;  
//this->Output ( bTempKey, 7 ) ;  
memcpy ( bTemp, bTempKey, 7 ) ;  
memset ( bTempKey, 0, sizeof(bTempKey) ) ;  
}  
}  
//  
// DES的单轮加密过程  
//  
void MyDES::DESSingleTurn ( BYTE nTurnIndex, BOOL bMode )  
{  
// L[n] = R[n-1]  
for ( UINT i = 0; i < 4; i++ )  
LMsg[nTurnIndex][i] = RMsg[nTurnIndex-1][i] ;  


// DES的F函数，（内部处理：R[n] = F( R[n-1], k[n] )）  
this->DES_f ( nTurnIndex, bMode ) ;  


// R[n] = L[n-1] xor F( R[n-1], k[n] ) ;  
for ( UINT i = 0; i < 4; i++ )  
RMsg[nTurnIndex][i] ^= LMsg[nTurnIndex-1][i] ;  
}  
//  
// DES的F函数  
//  
void MyDES::DES_f ( BYTE bTurnIndex, BOOL bMode )  
{  
PBYTE   R = RMsg[bTurnIndex-1] ;  
BYTE    bTemp[6] = {0} ;  
BYTE    C[4] = {0} ;  


// 扩展 R --> E(R)，结果保存在bTemp  
for ( BYTE i = 0; i < 48; i++ )  
{  
if ( R[(bBitExternTable[i]-1)>>3] & bBitMask[(~(bBitExternTable[i]-1))&7] )  
bTemp[i>>3] |= bBitMask[(~i)&7] ;  
else  
bTemp[i>>3] &= ( ~(bBitMask[(~i)&7]) );  
}  


// E(R) xor K，结果保存在bTemp  
for ( BYTE i = 0; i < 6; i++ )  
{  
if ( bMode )  
bTemp[i] ^= this->bSubKey[bTurnIndex][i] ;  
else  
bTemp[i] ^= this->bSubKey[17-bTurnIndex][i] ;  
}  


BYTE bStartPos = 0, bTarPos = 0, bTarValue ;  
BYTE bRowIndex = 0, bColIndex = 0 ;  
for ( BYTE bBoxIndex = 0; bBoxIndex < 8; bBoxIndex ++ )  
{  
// 确定行值  
if ( bTemp[bStartPos>>3] & bBitMask[(~bStartPos)&7] )  
bColIndex += 2 ;  
if ( bTemp[(bStartPos+5)>>3] & bBitMask[(~(bStartPos+5))&7] )  
bColIndex += 1 ;  


// 确定列值  
if ( bTemp[(bStartPos+1)>>3] & bBitMask[(~(bStartPos+1))&7] )  
bRowIndex += 8 ;  
if ( bTemp[(bStartPos+2)>>3] & bBitMask[(~(bStartPos+2))&7] )  
bRowIndex += 4 ;  
if ( bTemp[(bStartPos+3)>>3] & bBitMask[(~(bStartPos+3))&7] )  
bRowIndex += 2 ;  
if ( bTemp[(bStartPos+4)>>3] & bBitMask[(~(bStartPos+4))&7] )  
bRowIndex += 1 ;  


// 在S(i)盒中由上面行列所对应的值bTarValue  
bTarValue = SB[bBoxIndex][bColIndex][bRowIndex] ;  


// 把bTarValue转化成对应的C(i)  
if ( bTarValue >= 8 )  
{  
C[bTarPos>>3] |= bBitMask[(~bTarPos)&7] ;  
bTarValue -= 8 ;  
}  
if ( bTarValue >= 4 )  
{  
C[(bTarPos+1)>>3] |= bBitMask[(~(bTarPos+1))&7] ;  
bTarValue -= 4 ;  
}  
if ( bTarValue >= 2 )  
{  
C[(bTarPos+2)>>3] |= bBitMask[(~(bTarPos+2))&7] ;  
bTarValue -= 2 ;  
}  
if ( bTarValue >= 1 )  
{  
C[(bTarPos+3)>>3] |= bBitMask[(~(bTarPos+3))&7] ;  
bTarValue -= 1 ;  
}         


bRowIndex   = bColIndex = 0 ;  
bStartPos   += 6 ;  
bTarPos     += 4 ;  
}  


// 尾置换  
for ( BYTE i = 0; i < 32; i++ )  
{  
if ( C[(bTailSwapTable[i]-1)>>3] & bBitMask[(~(bTailSwapTable[i]-1))&7] )  
this->RMsg[bTurnIndex][i>>3] |= bBitMask[(~i)&7] ;  
else  
this->RMsg[bTurnIndex][i>>3] &= ( ~(bBitMask[(~i)&7]) );  
}  
}  
void MyDES::DES_SysInit ()  
{  
memset ( LMsg,      0, sizeof(LMsg) ) ;  
memset ( RMsg,      0, sizeof(RMsg) ) ;  
memset ( bSubKey,   0, sizeof(bSubKey) ) ;  
memset ( bCryptedMsg,   0, sizeof(bCryptedMsg) ) ;   
}  
void MyDES::DES_SetOriMsg ( PBYTE pMsg, UINT uLen )  
{  
memset ( this->bOriMsg, 0, sizeof(this->bOriMsg) ) ;  
memcpy ( this->bOriMsg, pMsg, uLen ) ;  
}  
void MyDES::DES_SetKey ( PBYTE pKey, UINT uLen )  
{  
memset ( this->bKey, 0, sizeof(this->bKey) ) ;  
memcpy ( this->bKey, pKey, uLen ) ;  
}  

c#：

 public class DESEncrypt
    {
        //static readonly string key = "or7kj0sv";
        private static byte[] byKey = { 0xA2, 0x5B, 0xDF, 0x79, 0x30, 0xC1, 0x4E, 0xCA };
        private static byte[] byIV = { 0xA2, 0x5B, 0xDF, 0x79, 0x30, 0xC1, 0x4E, 0xCA };
        public static string Encode(string data)
        {
            //  string s = System.Text.ASCIIEncoding.ASCII.GetString(byKey);
            //  byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(s);
            DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
            cryptoProvider.Mode = CipherMode.ECB;
            cryptoProvider.Padding = PaddingMode.Zeros;
            int i = cryptoProvider.KeySize;
            MemoryStream ms = new MemoryStream();
            CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write);
            StreamWriter sw = new StreamWriter(cst);
            sw.Write(data);
            sw.Flush();
            cst.FlushFinalBlock();
            sw.Flush();
            return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);
        }


        public static string Decode(string data)
        {
            // byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(key.Substring(0, 8));           
            try
            {
                var byEnc = Convert.FromBase64String(data);
                DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
                cryptoProvider.Mode = CipherMode.ECB;
                cryptoProvider.Padding = PaddingMode.Zeros;
                MemoryStream ms = new MemoryStream(byEnc);
                CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read);
                StreamReader sr = new StreamReader(cst);
                return sr.ReadToEnd().TrimEnd('\0');
            }
            catch
            {
                return null;
            }
        }
    }