DES加密 c++ C#
class MyDES
{
public:
MyDES(void);
~MyDES(void);
public:
BYTE bOriMsg[8] ; // 初始訊息 ( 64 bit )
BYTE LMsg[17][4], RMsg[17][4] ; // 中間變數L0-->L16,R0-->R16 ( 32 bit )
BYTE bKey[8] ; // 儲存金鑰 ( 64 bit )
BYTE bSubKey[17][6] ; // 儲存子金鑰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:
// 初始置換
void DESInitSwap ( ) ;
// 初始逆置換
void DESInitReSwap () ;
// 產生子金鑰
void DESGenSubKey ( ) ;
// DES的單輪加密過程
void DESSingleTurn ( BYTE nTurnIndex, BOOL bMode ) ;
// DES的F函式
void DES_f ( BYTE bTurnIndex, BOOL bMode ) ;
public:
// 初始化
void DES_SysInit () ;
// 設定明文
void DES_SetOriMsg ( PBYTE pMsg, UINT uLen ) ;
// 設定金鑰
void DES_SetKey ( PBYTE pKey, UINT uLen ) ;
};
#include "StdAfx.h"
#include "MyDES.h"
MyDES::MyDES(void)
{
}
MyDES::~MyDES(void)
{
}
// 初始置換表 (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
} ;
// 初始逆置換表 (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
} ;
// 位擴充套件表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位置換表--用於F的尾置換 (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個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
}
} ;
// 置換選擇表一 (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
} ;
// 置換選擇表二 (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
} ;
// 位掩碼錶
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 ;
}
//
// 初始置換
//
void MyDES::DESInitSwap ( )
{
// R[16]-L[16] 構成64位,經初始逆置換
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]) );
}
}
//
// 初始逆置換
//
void MyDES::DESInitReSwap ()
{
// R[16]-L[16] 構成64位,經初始逆置換
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]) ) ;
}
}
}
//
// 產生子金鑰
//
void MyDES::DESGenSubKey ( )
{
memset ( this->bSubKey, 0, sizeof(this->bSubKey) ) ;
// 置換選擇一
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] ;
}
// 產生子金鑰過程
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 ;
// 迴圈移位
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] ;
}
// 置換選擇二
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的單輪加密過程
//
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函式,(內部處理: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函式
//
void MyDES::DES_f ( BYTE bTurnIndex, BOOL bMode )
{
PBYTE R = RMsg[bTurnIndex-1] ;
BYTE bTemp[6] = {0} ;
BYTE C[4] = {0} ;
// 擴充套件 R --> E(R),結果儲存在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,結果儲存在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 ++ )
{
// 確定行值
if ( bTemp[bStartPos>>3] & bBitMask[(~bStartPos)&7] )
bColIndex += 2 ;
if ( bTemp[(bStartPos+5)>>3] & bBitMask[(~(bStartPos+5))&7] )
bColIndex += 1 ;
// 確定列值
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)盒中由上面行列所對應的值bTarValue
bTarValue = SB[bBoxIndex][bColIndex][bRowIndex] ;
// 把bTarValue轉化成對應的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 ;
}
// 尾置換
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;
}
}
}