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求教des算法的详细过程

saike • 2023-5-25 • 软件运维 • 阅读 7

求教des算法的详细过程,第1张

图为最详细的流程培茄

下附上完整如中罩C程序，我自己做的，你看看。

#include "stdio.h"

#include "memory.h"

#include "time.h"

#include "stdlib.h"

#define PLAIN_FILE_OPEN_ERROR -1

#define KEY_FILE_OPEN_ERROR -2

#define CIPHER_FILE_OPEN_ERROR -3

#define OK 1

typedef char ElemType

/*初始置换表IP*/

int IP_Table[64] = {  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,

56,48,40,32,24,16,8,0,

58,50,42,34,26,18,10,2,

60,52,44,36,28,20,12,4,

62,54,46,38,30,22,14,6}

/*逆初始置换表IP^-1*/

int IP_1_Table[64] = {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,

32,0,40,8,48,16,56,24}

/*扩充置换表E*/

int E_Table[48] = {31, 0, 1, 2, 3, 4,

3,  4, 5, 6, 7, 8,

7,  8,9,10,11,12,

11,12,13,14,15,16,

15,16,17,18,19,20,

19,20,21,22,23,24,

23,24,25,26,27,28,

27,28,29,30,31, 0}

/*置换函数P*/

int P_Table[32] = {15,6,19,20,28,11,27,16,

0,14,22,25,4,17,30,9,

1,7,23,13,31,26,2,8,

18,12,29,5,21,10,3,24}

/*S盒*/

int 渣闹S[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}}}

/*置换选择1*/

int PC_1[56] = {56,48,40,32,24,16,8,

0,57,49,41,33,25,17,

9,1,58,50,42,34,26,

18,10,2,59,51,43,35,

62,54,46,38,30,22,14,

6,61,53,45,37,29,21,

13,5,60,52,44,36,28,

20,12,4,27,19,11,3}

/*置换选择2*/

int PC_2[48] = {13,16,10,23,0,4,2,27,

14,5,20,9,22,18,11,3,

25,7,15,6,26,19,12,1,

40,51,30,36,46,54,29,39,

50,44,32,46,43,48,38,55,

33,52,45,41,49,35,28,31}

/*对左移次数的规定*/

int MOVE_TIMES[16] = {1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1}

int ByteToBit(ElemType ch,ElemType bit[8])

int BitToByte(ElemType bit[8],ElemType *ch)

int Char8ToBit64(ElemType ch[8],ElemType bit[64])

int Bit64ToChar8(ElemType bit[64],ElemType ch[8])

int DES_MakeSubKeys(ElemType key[64],ElemType subKeys[16][48])

int DES_PC1_Transform(ElemType key[64], ElemType tempbts[56])

int DES_PC2_Transform(ElemType key[56], ElemType tempbts[48])

int DES_ROL(ElemType data[56], int time)

int DES_IP_Transform(ElemType data[64])

int DES_IP_1_Transform(ElemType data[64])

int DES_E_Transform(ElemType data[48])

int DES_P_Transform(ElemType data[32])

int DES_SBOX(ElemType data[48])

int DES_XOR(ElemType R[48], ElemType L[48],int count)

int DES_Swap(ElemType left[32],ElemType right[32])

int DES_EncryptBlock(ElemType plainBlock[8], ElemType subKeys[16][48], ElemType cipherBlock[8])

int DES_DecryptBlock(ElemType cipherBlock[8], ElemType subKeys[16][48], ElemType plainBlock[8])

int DES_Encrypt(char *plainFile, char *keyStr,char *cipherFile)

int DES_Decrypt(char *cipherFile, char *keyStr,char *plainFile)

/*字节转换成二进制*/

int ByteToBit(ElemType ch, ElemType bit[8]){

int cnt

for(cnt = 0cnt < 8 cnt++){

*(bit+cnt) = (ch>>cnt)&1

}

return 0

}

/*二进制转换成字节*/

int BitToByte(ElemType bit[8],ElemType *ch){

int cnt

for(cnt = 0cnt < 8 cnt++){

*ch |= *(bit + cnt)<<cnt

}

return 0

}

/*将长度为8的字符串转为二进制位串*/

int Char8ToBit64(ElemType ch[8],ElemType bit[64]){

int cnt

for(cnt = 0 cnt < 8 cnt++){

ByteToBit(*(ch+cnt),bit+(cnt<<3))

}

return 0

}

/*将二进制位串转为长度为8的字符串*/

int Bit64ToChar8(ElemType bit[64],ElemType ch[8]){

int cnt

memset(ch,0,8)

for(cnt = 0 cnt < 8 cnt++){

BitToByte(bit+(cnt<<3),ch+cnt)

}

return 0

}

/*生成子密钥*/

int DES_MakeSubKeys(ElemType key[64],ElemType subKeys[16][48]){

ElemType temp[56]

int cnt

DES_PC1_Transform(key,temp)/*PC1置换*/

for(cnt = 0 cnt < 16 cnt++){/*16轮跌代，产生16个子密钥*/

DES_ROL(temp,MOVE_TIMES[cnt])/*循环左移*/

DES_PC2_Transform(temp,subKeys[cnt])/*PC2置换，产生子密钥*/

}

return 0

}

/*密钥置换1*/

int DES_PC1_Transform(ElemType key[64], ElemType tempbts[56]){

int cnt

for(cnt = 0 cnt < 56 cnt++){

tempbts[cnt] = key[PC_1[cnt]]

}

return 0

}

/*密钥置换2*/

int DES_PC2_Transform(ElemType key[56], ElemType tempbts[48]){

int cnt

for(cnt = 0 cnt < 48 cnt++){

tempbts[cnt] = key[PC_2[cnt]]

}

return 0

}

/*循环左移*/

int DES_ROL(ElemType data[56], int time){

ElemType temp[56]

/*保存将要循环移动到右边的位*/

memcpy(temp,data,time)

memcpy(temp+time,data+28,time)

/*前28位移动*/

memcpy(data,data+time,28-time)

memcpy(data+28-time,temp,time)

/*后28位移动*/

memcpy(data+28,data+28+time,28-time)

memcpy(data+56-time,temp+time,time)

return 0

}

/*IP置换*/

int DES_IP_Transform(ElemType data[64]){

int cnt

ElemType temp[64]

for(cnt = 0 cnt < 64 cnt++){

temp[cnt] = data[IP_Table[cnt]]

}

memcpy(data,temp,64)

return 0

}

/*IP逆置换*/

int DES_IP_1_Transform(ElemType data[64]){

int cnt

ElemType temp[64]

for(cnt = 0 cnt < 64 cnt++){

temp[cnt] = data[IP_1_Table[cnt]]

}

memcpy(data,temp,64)

return 0

}

/*扩展置换*/

int DES_E_Transform(ElemType data[48]){

int cnt

ElemType temp[48]

for(cnt = 0 cnt < 48 cnt++){

temp[cnt] = data[E_Table[cnt]]

}

memcpy(data,temp,48)

return 0

}

/*P置换*/

int DES_P_Transform(ElemType data[32]){

int cnt

ElemType temp[32]

for(cnt = 0 cnt < 32 cnt++){

temp[cnt] = data[P_Table[cnt]]

}

memcpy(data,temp,32)

return 0

}

/*异或*/

int DES_XOR(ElemType R[48], ElemType L[48] ,int count){

int cnt

for(cnt = 0 cnt < count cnt++){

R[cnt] ^= L[cnt]

}

return 0

}

/*S盒置换*/

int DES_SBOX(ElemType data[48]){

int cnt

int line,row,output

int cur1,cur2

for(cnt = 0 cnt < 8 cnt++){

cur1 = cnt*6

cur2 = cnt<<2

/*计算在S盒中的行与列*/

line = (data[cur1]<<1) + data[cur1+5]

row = (data[cur1+1]<<3) + (data[cur1+2]<<2)

+ (data[cur1+3]<<1) + data[cur1+4]

output = S[cnt][line][row]

/*化为2进制*/

data[cur2] = (output&0X08)>>3

data[cur2+1] = (output&0X04)>>2

data[cur2+2] = (output&0X02)>>1

data[cur2+3] = output&0x01

}

return 0

}

/*交换*/

int DES_Swap(ElemType left[32], ElemType right[32]){

ElemType temp[32]

memcpy(temp,left,32)

memcpy(left,right,32)

memcpy(right,temp,32)

return 0

}

/*加密单个分组*/

int DES_EncryptBlock(ElemType plainBlock[8], ElemType subKeys[16][48], ElemType cipherBlock[8]){

ElemType plainBits[64]

ElemType copyRight[48]

int cnt

Char8ToBit64(plainBlock,plainBits)

/*初始置换（IP置换）*/

DES_IP_Transform(plainBits)

/*16轮迭代*/

for(cnt = 0 cnt < 16 cnt++){

memcpy(copyRight,plainBits+32,32)

/*将右半部分进行扩展置换，从32位扩展到48位*/

DES_E_Transform(copyRight)

/*将右半部分与子密钥进行异或 *** 作*/

DES_XOR(copyRight,subKeys[cnt],48)

/*异或结果进入S盒，输出32位结果*/

DES_SBOX(copyRight)

/*P置换*/

DES_P_Transform(copyRight)

/*将明文左半部分与右半部分进行异或*/

DES_XOR(plainBits,copyRight,32)

if(cnt != 15){

/*最终完成左右部的交换*/

DES_Swap(plainBits,plainBits+32)

}

}

/*逆初始置换（IP^1置换）*/

DES_IP_1_Transform(plainBits)

Bit64ToChar8(plainBits,cipherBlock)

return 0

}

/*解密单个分组*/

int DES_DecryptBlock(ElemType cipherBlock[8], ElemType subKeys[16][48],ElemType plainBlock[8]){

ElemType cipherBits[64]

ElemType copyRight[48]

int cnt

Char8ToBit64(cipherBlock,cipherBits)

/*初始置换（IP置换）*/

DES_IP_Transform(cipherBits)

/*16轮迭代*/

for(cnt = 15 cnt >= 0 cnt--){

memcpy(copyRight,cipherBits+32,32)

/*将右半部分进行扩展置换，从32位扩展到48位*/

DES_E_Transform(copyRight)

/*将右半部分与子密钥进行异或 *** 作*/

DES_XOR(copyRight,subKeys[cnt],48)

/*异或结果进入S盒，输出32位结果*/

DES_SBOX(copyRight)

/*P置换*/

DES_P_Transform(copyRight)

/*将明文左半部分与右半部分进行异或*/

DES_XOR(cipherBits,copyRight,32)

if(cnt != 0){

/*最终完成左右部的交换*/

DES_Swap(cipherBits,cipherBits+32)

}

}

/*逆初始置换（IP^1置换）*/

DES_IP_1_Transform(cipherBits)

Bit64ToChar8(cipherBits,plainBlock)

return 0

}

/*加密文件*/

int DES_Encrypt(char *plainFile, char *keyStr,char *cipherFile){

FILE *plain,*cipher

int count

ElemType plainBlock[8],cipherBlock[8],keyBlock[8]

ElemType bKey[64]

ElemType subKeys[16][48]

if((plain = fopen(plainFile,"rb")) == NULL){

return PLAIN_FILE_OPEN_ERROR

}

if((cipher = fopen(cipherFile,"wb")) == NULL){

return CIPHER_FILE_OPEN_ERROR

}

/*设置密钥*/

memcpy(keyBlock,keyStr,8)

/*将密钥转换为二进制流*/

Char8ToBit64(keyBlock,bKey)

/*生成子密钥*/

DES_MakeSubKeys(bKey,subKeys)

while(!feof(plain)){

/*每次读8个字节，并返回成功读取的字节数*/

if((count = fread(plainBlock,sizeof(char),8,plain)) == 8){

DES_EncryptBlock(plainBlock,subKeys,cipherBlock)

fwrite(cipherBlock,sizeof(char),8,cipher)

}

}

if(count){

/*填充*/

memset(plainBlock + count,'\0',7 - count)

/*最后一个字符保存包括最后一个字符在内的所填充的字符数量*/

plainBlock[7] = 8 - count

DES_EncryptBlock(plainBlock,subKeys,cipherBlock)

fwrite(cipherBlock,sizeof(char),8,cipher)

}

fclose(plain)

fclose(cipher)

return OK

}

/*解密文件*/

int DES_Decrypt(char *cipherFile, char *keyStr,char *plainFile){

FILE *plain, *cipher

int count,times = 0

long fileLen

ElemType plainBlock[8],cipherBlock[8],keyBlock[8]

ElemType bKey[64]

ElemType subKeys[16][48]

if((cipher = fopen(cipherFile,"rb")) == NULL){

return CIPHER_FILE_OPEN_ERROR

}

if((plain = fopen(plainFile,"wb")) == NULL){

return PLAIN_FILE_OPEN_ERROR

}

/*设置密钥*/

memcpy(keyBlock,keyStr,8)

/*将密钥转换为二进制流*/

Char8ToBit64(keyBlock,bKey)

/*生成子密钥*/

DES_MakeSubKeys(bKey,subKeys)

/*取文件长度 */

fseek(cipher,0,SEEK_END)/*将文件指针置尾*/

fileLen = ftell(cipher) /*取文件指针当前位置*/

rewind(cipher) /*将文件指针重指向文件头*/

while(1){

/*密文的字节数一定是8的整数倍*/

fread(cipherBlock,sizeof(char),8,cipher)

DES_DecryptBlock(cipherBlock,subKeys,plainBlock)

times += 8

if(times < fileLen){

fwrite(plainBlock,sizeof(char),8,plain)

}

else{

break

}

}

/*判断末尾是否被填充*/

if(plainBlock[7] < 8){

for(count = 8 - plainBlock[7] count < 7 count++){

if(plainBlock[count] != '\0'){

break

}

}

}

if(count == 7){/*有填充*/

fwrite(plainBlock,sizeof(char),8 - plainBlock[7],plain)

}

else{/*无填充*/

fwrite(plainBlock,sizeof(char),8,plain)

}

fclose(plain)

fclose(cipher)

return OK

}

int main()

{

clock_t a,b

a = clock()

DES_Encrypt("1.txt","key.txt","2.txt")

b = clock()

printf("加密消耗%d毫秒\n",b-a)

system("pause")

a = clock()

DES_Decrypt("2.txt","key.txt","3.txt")

b = clock()

printf("解密消耗%d毫秒\n",b-a)

getchar()

return 0

}

#include <stdio.h> #include <string.h> #include <windows.h> #include <conio.h> #include "Schedle.h" class CShift{ public: DWORDLONG mask[16] int step[16] CShift(){ for(int i=0i<16i++){ step[i]=2 mask[i]=0xc000000 } step[0]=step[1]=step[8]=step[15]=1 mask[0]=mask[1]=mask[8]=mask[15]=0x8000000 } } class CDES{ public: CDES(){ m_dwlKey=0 m_dwlData=0 ConvertTableToMask(dwlKey_PC_1,64) //PrintTable(dwlKey_PC_1,7,8) ConvertTableToMask(dwlKey_PC_2,56) ConvertTableToMask(dwlData_IP,64) ConvertTableToMask(dwlData_Expansion,32) ConvertTableToMask(dwlData_FP,64) ConvertTableToMask(dwlData_P,32) Generate_S() } void PrintBit(DWORDLONG) void EncryptKey(char *) unsigned char* EncryptData(unsigned char *) unsigned char* DescryptData(unsigned char*) private: void ConvertTableToMask(DWORDLONG *,int) void Generate_S(void) void PrintTable(DWORDLONG*,int,int) DWORDLONG ProcessByte(unsigned char*,BOOL) DWORDLONG PermuteTable(DWORDLONG,DWORDLONG*,int) void Generate_K(void) void EncryptKernel(void) DWORDLONG Generate_B(DWORDLONG,DWORDLONG*) /*For verify schedule permutation only*/嫌颤 DWORDLONG UnPermuteTable(DWORDLONG,DWORDLONG*,int) /**************************************/ DWORDLONG dwlData_S[9][4][16] CShift m_shift DWORDLONG m_dwlKey DWORDLONG m_dwlData DWORDLONG m_dwl_K[17] } void CDES::EncryptKey(char *key){ printf("\nOriginal Key: %s"毕者凯,key) m_dwlKey=ProcessByte((unsigned char*)key,TRUE) // PrintBit(m_dwlKey) m_dwlKey=PermuteTable(m_dwlKey,dwlKey_PC_1,56) // PrintBit(m_dwlKey) Generate_K() //手唤 printf("\n******************************************\n") } void CDES::Generate_K(void){ DWORDLONG C[17],D[17],tmp C[0]=m_dwlKey>>28 D[0]=m_dwlKey&0xfffffff for(int i=1i<=16i++){ tmp=(C[i-1]&m_shift.mask[i-1])>>(28-m_shift.step[i-1]) C[i]=((C[i-1]<<m_shift.step[i-1])|tmp)&0x0fffffff tmp=(D[i-1]&m_shift.mask[i-1])>>(28-m_shift.step[i-1]) D[i]=((D[i-1]<<m_shift.step[i-1])|tmp)&0x0fffffff m_dwl_K[i]=(C[i]<<28)|D[i] m_dwl_K[i]=PermuteTable(m_dwl_K[i],dwlKey_PC_2,48) } } DWORDLONG CDES::ProcessByte(unsigned char *key,BOOL shift){ unsigned char tmp DWORDLONG byte=0 int i=0 while(i<8){ while(*key){ if(byte!=0) byte<<=8 tmp=*key if(shift) tmp<<=1 byte|=tmp i++ key++ } if(i<8) byte<<=8 i++ } return byte } DWORDLONG CDES::PermuteTable(DWORDLONG dwlPara,DWOR 基于des算法的rfid安全系统

DLONG* dwlTable,int nDestLen){ int i=0 DWORDLONG tmp=0,moveBit while(i<nDestLen){ moveBit=1 if(dwlTable[i]&dwlPara){ moveBit<<=nDestLen-i-1 tmp|=moveBit } i++ } return tmp } DWORDLONG CDES::UnPermuteTable(DWORDLONG dwlPara,DWORDLONG* dwlTable,int nDestLen){ DWORDLONG tmp=0 int i=nDestLen-1 while(dwlPara!=0){ if(dwlPara&0x01) tmp|=dwlTable[i] dwlPara>>=1 i-- } return tmp } void CDES::PrintTable(DWORDLONG *dwlPara,int col,int row){ int i,j for(i=0i<rowi++){ printf("\n") getch() for(j=0j<colj++) PrintBit(dwlPara[i*col+j]) } } void CDES::PrintBit(DWORDLONG bitstream){ char out[76] int i=0,j=0,space=0 while(bitstream!=0){ if(bitstream&0x01) out[i++]='1' else out[i++]='0' j++ if(j%8==0){ out[i++]=' ' space++ } bitstream=bitstream>>1 } out[i]='\0' strcpy(out,strrev(out)) printf("%s **:%d\n",out,i-space) } void CDES::ConvertTableToMask(DWORDLONG *mask,int max){ int i=0 DWORDLONG nBit=1 while(mask[i]!=0){ nBit=1 nBit<<=max-mask[i] mask[i++]=nBit } } void CDES::Generate_S(void){ int i int j,m,n m=n=0 j=1 for(i=0i<512i++){ dwlData_S[j][m][n]=OS[i] n=(n+1)%16 if(!n){ m=(m+1)%4 if(!m) j++ } } } unsigned char * CDES::EncryptData(unsigned char *block){ unsigned char *EncrytedData=new unsigned char(15) printf("\nOriginal Data: %s\n",block) m_dwlData=ProcessByte(block,0) // PrintBit(m_dwlData) m_dwlData=PermuteTable(m_dwlData,dwlData_IP,64) EncryptKernel() // PrintBit(m_dwlData) DWORDLONG bit6=m_dwlData for(int i=0i<11i++){ EncrytedData[7-i]=(unsigned char)(bit6&0x3f)+46 bit6>>=6 } EncrytedData[11]='\0' printf("\nAfter Encrypted: %s",EncrytedData) for(i=0i<8i++){ EncrytedData[7-i]=(unsigned char)(m_dwlData&0xff) m_dwlData>>=8 } EncrytedData[8]='\0' return EncrytedData } void CDES::EncryptKernel(void){ int i=1 DWORDLONG L[17],R[17],B[9],EK,PSB L[0]=m_dwlData>>32 R[0]=m_dwlData&0xffffffff for(i=1i<=16i++){ L[i]=R[i-1] R[i-1]=PermuteTable(R[i-1],dwlData_Expansion,48)//Expansion R EK=R[i-1]^m_dwl_K[i]//E Permutation PSB=Generate_B(EK,B)//P Permutation R[i]=L[i-1]^PSB } R[16]<<=32 m_dwlData=R[16]|L[16] m_dwlData=PermuteTable(m_dwlData,dwlData_FP,64) } unsigned char* CDES::DescryptData(unsigned char *desData){ int i=1 unsigned char *DescryptedData=new unsigned char(15) DWORDLONG L[17],R[17],B[9],EK,PSB DWORDLONG dataPara dataPara=ProcessByte(desData,0) dataPara=PermuteTable(dataPara,dwlData_IP,64) R[16]=dataPara>>32 L[16]=dataPara&0xffffffff for(i=16i>=1i--){ R[i-1]=L[i] L[i]=PermuteTable(L[i],dwlData_Expansion,48)//Expansion L EK=L[i]^m_dwl_K[i]//E Permutation PSB=Generate_B(EK,B)//P Permutation L[i-1]=R[i]^PSB } L[0]<<=32 dataPara=L[0]|R[0] dataPara=PermuteTable(dataPara,dwlData_FP,64) // PrintBit(dataPara) for(i=0i<8i++){ DescryptedData[7-i]=(unsigned char)(dataPara&0xff) dataPara>>=8 } DescryptedData[8]='\0' printf("\nAfter Decrypted: %s\n",DescryptedData) return DescryptedData } DWORDLONG CDES::Generate_B(DWORDLONG EKPara,DWORDLONG *block){ int i,m,n DWORDLONG tmp=0 for(i=8i>0i--){ block[i]=EKPara&0x3f m=(int)(block[i]&0x20)>>4 m|=block[i]&0x01 n=(int)(block[i]<<1)>>2 block[i]=dwlData_S[i][m][n] EKPara>>=6 } for(i=1i<=8i++){ tmp|=block[i] tmp<<=4 } tmp>>=4 tmp=PermuteTable(tmp,dwlData_P,32) return tmp } void main(void){ CDES des des.EncryptKey("12345678") unsigned char *result=des.EncryptData((unsigned char*)"DemoData") des.DescryptData(result) }[1]

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