本文格式為Word版，下載可任意編輯——C中四種加密算法之DES源代碼C++中四種加密算法之DES源代碼

DES算法是一種最通用的對(duì)稱密鑰算法，由于算法本身是公開的，所以其安好性在于密鑰的安好性?；诿荑€的算法通常有兩類：對(duì)稱算法和公開密鑰算法。對(duì)稱算法的對(duì)稱性表達(dá)在加密密鑰能夠從解密密鑰推算出來(lái)，反之亦然。下面梳理了C++中四種加密算法之DES源代碼，供大家參考借鑒。

在大多數(shù)對(duì)稱算法中，加解密的`密鑰是一致的，DES就是這樣?？梢?jiàn)，對(duì)稱密鑰算法的加解密密鑰都是保密的。而公開密鑰算法的加密密鑰是公開的，解密密鑰是保密的。

DES概括算法如下：

//////////////////////////////////////////////////////////////////////////

/*

Providedby朱孟斌,NationalUniversityOfTechnology

Email:zmbtsubasa@gmailcom

Thisproductisfreeforuse

*/

//////////////////////////////////////////////////////////////////////////

#ifndefDes_H

#defineDes_H

//!enumboolfalse,true;

/*!

ifboolisnotsupported,usethisorjustreplacewithcharanduse1fortrue,0forfalse;

@seeenumENCRYPT,DECRYPT;

*/

enumENCRYPT,DECRYPT;

/*@brief16圈子密鑰*/

staticboolSubKey[2][16][48];//16圈子密鑰

/*@brief3次DES標(biāo)志*/

staticboolIs3DES;//3次DES標(biāo)志

staticcharTmp[256];

staticchardeskey[16];

typedefbool*PSubKey[16][48];

class_declspecdllexportDes

public:

Des;

~Des;

//!Type—ENCRYPT:加密,DECRYPT:解密

/*!

輸出緩沖區(qū)Out的長(zhǎng)度=datalen+7/8*8,即比datalen大的且是8的倍數(shù)的最小正整數(shù)

In可以=Out,此時(shí)加/解密后將籠罩輸入緩沖區(qū)In的內(nèi)容

當(dāng)keylen8時(shí)系統(tǒng)自動(dòng)使用3次DES加/解密,否那么使用標(biāo)準(zhǔn)DES加/解密超過(guò)16字節(jié)后只取前16字節(jié)

@seeboolDes_Gochar*Out,char*In,longdatalen,constchar*Key,intkeylen,boolType=ENCRYPT;

*/

boolDes_Gochar*Out,char*In,longdatalen,constchar*Key,intkeylen,boolType=ENCRYPT;

private:

/*!@brief標(biāo)準(zhǔn)DES加/解密

@seestaticvoidDEScharOut[8],charIn[8],constPSubKeypSubKey,boolType;

*/

staticvoidDEScharOut[8],charIn[8],constPSubKeypSubKey,boolType;//標(biāo)準(zhǔn)DES加/解密

/*!@brief設(shè)置密鑰

@seestaticvoidSetKeyconstchar*Key,intlen;

*/

staticvoidSetKeyconstchar*Key,intlen;//設(shè)置密鑰

/*!@brief設(shè)置子密鑰

@seestaticvoidSetSubKeyPSubKeypSubKey,constcharKey[8];

*/

staticvoidSetSubKeyPSubKeypSubKey,constcharKey[8];//設(shè)置子密鑰

/*!@brieff函數(shù)

@seestaticvoidF_funcboolIn[32],constboolKi[48];

*/

staticvoidF_funcboolIn[32],constboolKi[48];//f函數(shù)

/*!@briefS盒代替

@seestaticvoidS_funcboolOut[32],constboolIn[48];

*/

staticvoidS_funcboolOut[32],constboolIn[48];//S盒代替

/*!@brief變換

@seestaticvoidTransformbool*Out,bool*In,constchar*Table,intlen;

*/

staticvoidTransformbool*Out,bool*In,constchar*Table,intlen;//變換

/*!@brief異或

@seestaticvoidXorbool*InA,constbool*InB,intlen;

*/

staticvoidXorbool*InA,constbool*InB,intlen;//異或

/*!@brief循環(huán)左移

@seestaticvoidRotateLbool*In,intlen,intloop;

*/

staticvoidRotateLbool*In,intlen,intloop;//循環(huán)左移

/*!@brief字節(jié)組轉(zhuǎn)換成位組

@seestaticvoidByteToBitbool*Out,constchar*In,intbits;

*/

staticvoidByteToBitbool*Out,constchar*In,intbits;//字節(jié)組轉(zhuǎn)換成位組

/*!@brief位組轉(zhuǎn)換成字節(jié)組

@seestaticvoidBitToBytechar*Out,constbool*In,intbits;

*/

staticvoidBitToBytechar*Out,constbool*In,intbits;//位組轉(zhuǎn)換成字節(jié)組

;

//////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////

#endif

DES.cpp文件：

//////////////////////////////////////////////////////////////////////////

/*

Providedby朱孟斌,NationalUniversityOfTechnology

Email:zmbtsubasa@gmailcom

Thisproductisfreeforuse

*/

//////////////////////////////////////////////////////////////////////////

#includememoryh

#includeDesh

//////////////////////////////////////////////////////////////////////////

//initialpermutationIP

conststaticcharIP_Table[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

;

//finalpermutationIP^-1

conststaticcharIPR_Table[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

;

//expansionoperationmatrix

staticconstcharE_Table[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-bitpermutationfunctionPusedontheoutputoftheS-boxes

conststaticcharP_Table[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

;

//permutedchoicetablekey

conststaticcharPC1_Table[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

;

//permutedchoicekeytable

conststaticcharPC2_Table[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

;

//numberleftrotationsofpc1

conststaticcharLOOP_Table[16]=

1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1

;

//TheinfamousS-boxes

conststaticcharS_Box[8][4][16]=

//S1

14,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7,

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,

//S2

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,

//S3

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,

//S4

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,

//S5

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,

//S6

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,

//S7

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,

//S8

13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7,

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

;

//////////////////////////////////////////////////////////////////////////

//Codestarts:

//////////////////////////////////////////////////////////////////////////

Des::Des

Des::~Des

boolDes::Des_Gochar*Out,char*In,longdatalen,constchar*Key,intkeylen,boolType

if!OutInKeydatalen=datalen+70xfffffff8

returnfalse;

SetKeyKey,keylen;

if!Is3DES//1次DES

forlongi=0,j=datalen3;ij;++i,Out+=8,In+=8

DESOut,In,SubKey[0],Type;

else//3次DES加密:加key0-解key1-加key0解密::解key0-加key1-解key0

forlongi=0,j=datalen3;ij;++i,Out+=8,In+=8

DESOut,In,SubKey[0],Type;

DESOut,Out,SubKey[1],!Type;

DESOut,Out,SubKey[0],Type;

returntrue;

voidDes::SetKeyconstchar*Key,intlen

memsetdeskey,0,16;

memcpydeskey,Key,len16?16:len;

SetSubKeySubKey[0],deskey[0];

Is3DES=len8?SetSubKeySubKey[1],deskey[8],true:false;

voidDes::DEScharOut[8],charIn[8],constPSubKeypSubKey,boolType

staticboolM[64],tmp[32],*Li=M[0],*Ri=M[32];

ByteToBitM,In,64;

TransformM,M,IP_Table,64;

ifType==ENCRYPT

forinti=0;i16;++i

memcpytmp,Ri,32;

F_funcRi,*pSubKey[i];

XorRi,Li,32;

memcpyLi,tmp,32;

else

forinti=15;i=0;--i

memcpytmp,Li,32;

F_funcLi,*pSubKey[i];

XorLi,Ri,32;

memcpyRi,tmp,32;

TransformM,M,IPR_Table,64;

BitToByteOut,M,64;

voidDes::SetSubKeyPSubKeypSubKey,constcharKey[8]

staticboolK[64],*KL=K[0],*KR=K[28];

ByteToBitK,Key,64;

TransformK,K,PC1_Table,56;

forinti=0;i16;++i

RotateLKL,28,LOOP_Table[i];

RotateLKR,28,LOOP_Table[i];

Transform*pSubKey[i],K,PC2_Table,48;

voidDes::F_funcboolIn[32],constboolKi[48]

staticboolMR[48];

TransformMR,In,E_Table,48;

XorMR,Ki,48;

S_funcIn,