des实现代码CC++.docx
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des实现代码CC++
des.h文件：
#ifndefCRYPTOPP_DES_H
#defineCRYPTOPP_DES_H
#include"cryptlib.h"
#include"misc.h"
NAMESPACE_BEGIN（CryptoPP）
classDES:
publicBlockTransformation
{
public:
DES（constbyte*userKey,CipherDir）;
voidProcessBlock（constbyte*inBlock,byte*outBlock）const;
voidProcessBlock（byte*inoutBlock）const
{DES:
:
ProcessBlock（inoutBlock,inoutBlock）;}
enum{KEYLENGTH=8,BLOCKSIZE=8};
unsignedintBlockSize（）const{returnBLOCKSIZE;}
protected:
staticconstword32Spbox[8][64];
SecBlockk;
};
classDESEncryption:
publicDES
{
public:
DESEncryption（constbyte*userKey）
:
DES（userKey,ENCRYPTION）{}
};
classDESDecryption:
publicDES
{
public:
DESDecryption（constbyte*userKey）
:
DES（userKey,DECRYPTION）{}
};
classDES_EDE_Encryption:
publicBlockTransformation
{
public:
DES_EDE_Encryption（constbyte*userKey）
:
e（userKey,ENCRYPTION）,d（userKey+DES:
:
KEYLENGTH,DECRYPTION）{}
voidProcessBlock（constbyte*inBlock,byte*outBlock）const;
voidProcessBlock（byte*inoutBlock）const;
enum{KEYLENGTH=16,BLOCKSIZE=8};
unsignedintBlockSize（）const{returnBLOCKSIZE;}
private:
DESe,d;
};
classDES_EDE_Decryption:
publicBlockTransformation
{
public:
DES_EDE_Decryption（constbyte*userKey）
:
d（userKey,DECRYPTION）,e（userKey+DES:
:
KEYLENGTH,ENCRYPTION）{}
voidProcessBlock（constbyte*inBlock,byte*outBlock）const;
voidProcessBlock（byte*inoutBlock）const;
enum{KEYLENGTH=16,BLOCKSIZE=8};
unsignedintBlockSize（）const{returnBLOCKSIZE;}
private:
DESd,e;
};
classTripleDES_Encryption:
publicBlockTransformation
{
public:
TripleDES_Encryption（constbyte*userKey）
:
e1（userKey,ENCRYPTION）,d（userKey+DES:
:
KEYLENGTH,DECRYPTION）,
e2（userKey+2*DES:
:
KEYLENGTH,ENCRYPTION）{}
voidProcessBlock（constbyte*inBlock,byte*outBlock）const;
voidProcessBlock（byte*inoutBlock）const;
enum{KEYLENGTH=24,BLOCKSIZE=8};
unsignedintBlockSize（）const{returnBLOCKSIZE;}
private:
DESe1,d,e2;
};
classTripleDES_Decryption:
publicBlockTransformation
{
public:
TripleDES_Decryption（constbyte*userKey）
:
d1（userKey+2*DES:
:
KEYLENGTH,DECRYPTION）,e（userKey+DES:
:
KEYLENGTH,ENCRYPTION）,
d2（userKey,DECRYPTION）{}
voidProcessBlock（constbyte*inBlock,byte*outBlock）const;
voidProcessBlock（byte*inoutBlock）const;
enum{KEYLENGTH=24,BLOCKSIZE=8};
unsignedintBlockSize（）const{returnBLOCKSIZE;}
private:
DESd1,e,d2;
};
NAMESPACE_END
#endif
des.cpp文件：
//des.cpp-modifiedbyWeiDaifrom:
/*
*ThisisamajorrewriteofmyoldpublicdomainDEScodewritten
*circa1987,whichinturnborrowedheavilyfromJimGillogly's1977
*publicdomaincode.Iprettymuchkeptmykeyschedulingcode,but
*theactualencrypt/decryptroutinesaretakenfromfromRichard
*Outerbridge'sDEScodeasprintedinSchneier's"AppliedCryptography."
*
*Thiscodeisinthepublicdomain.Iwouldappreciatebugreportsand
*enhancements.
*
*PhilKarnKA9Q,karn@unix.ka9q.ampr.org,August1994.
*/
#include"pch.h"
#include"misc.h"
#include"des.h"
NAMESPACE_BEGIN（CryptoPP）
/*TablesdefinedintheDataEncryptionStandarddocuments
*Threeofthesetables,theinitialpermutation,thefinal
*permutationandtheexpansionoperator,areregularenoughthat
*forspeed,wehard-codethem.They'rehereforreferenceonly.
*Also,theSandPboxesareusedbyaseparateprogram,gensp.c,
*tobuildthecombinedSPbox,Spbox[].They'realsoherejust
*forreference.
*/
#ifdefnotdef
/*initialpermutationIP*/
staticbyteip[]={
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*/
staticbytefp[]={
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*/
staticbyteei[]={
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
};
/*The（in）famousS-boxes*/
staticbytesbox[8][64]={
/*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
};
/*32-bitpermutationfunctionPusedontheoutputoftheS-boxes*/
staticbytep32i[]={
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
};
#endif
/*permutedchoicetable（key）*/
staticconstbytepc1[]={
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
};
/*numberleftrotationsofpc1*/
staticconstbytetotrot[]={
1,2,4,6,8,10,12,14,15,17,19,21,23,25,27,28
};
/*permutedchoicekey（table）*/
staticconstbytepc2[]={
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
};
/*EndofDES-definedtables*/
/*bit0isleft-mostinbyte*/
staticconstintbytebit[]={
0200,0100,040,020,010,04,02,01
};
/*Setkey（initializekeyschedulearray）*/
DES:
:
DES（constbyte*key,CipherDirdir）
:
k（32）
{
SecByteBlockbuffer（56+56+8）;
byte*constpc1m=buffer;/*placetomodifypc1into*/
byte*constpcr=pc1m+56;/*placetorotatepc1into*/
byte*constks=pcr+56;
registerinti,j,l;
intm;
for（j=0;j<56;j++）{/*convertpc1tobitsofkey*/
l=pc1[j]-1;/*integerbitlocation*/
m=l&07;/*findbit*/
pc1m[j]=（key[l>>3]&/*findwhichkeybytelisin*/
bytebit[m]）/*andwhichbitofthatbyte*/
?
1:
0;/*andstore1-bitresult*/
}
for（i=0;i<16;i++）{/*keychunkforeachiteration*/
memset（ks,0,8）;/*Clearkeyschedule*/
for（j=0;j<56;j++）/*rotatepc1therightamount*/
pcr[j]=pc1m[（l=j+totrot[i]）<（j<28?
28:
56）?
l:
l-28];
/*rotateleftandrighthalvesindependently*/
for（j=0;j<48;j++）{/*selectbitsindividually*/
/*checkbitthatgoestoks[j]*/
if（pcr[pc2[j]-1]）{
/*maskitinifit'sthere*/
l=j%6;
ks[j/6]|=bytebit[l]>>2;
}
}
/*Nowconverttoodd/eveninterleavedformforuseinF*/
k[2*i]=（（word32）ks[0]<<24）
|（（word32）ks[2]<<16）
|（（word32）ks[4]<<8）
|（（word32）ks[6]）;
k[2*i+1]=（（word32）ks[1]<<24）
|（（word32）ks[3]<<16）
|（（word32）ks[5]<<8）
|（（word32）ks[7]）;
}
if（dir==DECRYPTION）//reversekeyscheduleorder
for（i=0;i<16;i+=2）
{
std:
:
swap（k[i],k[32-2-i]）;
std:
:
swap（k[i+1],k[32-1-i]）;
}
}
/*EndofCcodecommontobothversions*/
/*Ccodeonlyinportableversion*/
//RichardOuterbridge'sinitialpermutationalgorithm
/*
inlinevoidIPERM（word32&left,word32&right）
{
word32work;
work=（（left>>4）^right）&0x0f0f0f0f;
right^=work;
left^=work<<4;
work=（（left>>16）^right）&0xffff;
right^=work;
left^=work<<16;
work=（（right>>2）^left）&0x33333333;
left^=work;
right^=（work<<2）;
work=（（right>>8）^left）&0xff00ff;
left^=work;
right^=（work<<8）;
right=rotl（right,1）;
work=（left^right）&0xaaaaaaaa;
left^=work;
right^=work;
left=rotl（left,1）;
}
inlinevoidFPERM（word32&left,word32&right）
{
word32work;
right=rotr（right,1）;
work=（left^right）&0xaaaaaaaa;
left^=work;
right^=work;
left=rotr（left,1）;
work=（（left>>8）^right）&0xff00f
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