下面附上壹個完整的C程序,是我自己做的。看壹看。
#包含?" stdio.h "
#包含?" memory.h "
#包含?"時間. h "
#包含?" stdlib.h "
#定義?普通文件打開錯誤?-1
#定義?密鑰_文件_打開_錯誤?-2
#定義?密碼_文件_打開_錯誤?-3
#定義?好嗎?1?
typedef?夏爾?ElemType?
/*初始替換表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};?
/*逆初始替換表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};
/*擴展替換表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};
/*置換函數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框*/
int?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}}};
/*替換選擇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};
/*替換選項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};
/*關於左移次數的規定*/
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?位[8]);
int?BitToByte(ElemType?位[8],ElemType?* ch);
int?Char8ToBit64(ElemType?ch[8],ElemType?位[64]);
int?Bit64ToChar8(ElemType?位[64],ElemType?ch[8]);
int?DES_MakeSubKeys(ElemType?key[64],ElemType?子密鑰[16][48]);
int?DES _ PC 1 _ Transform(elem type?鍵[64],?ElemType?tempbts[56]);
int?DES_PC2_Transform(ElemType?鍵[56],?ElemType?tempbts[48]);
int?德斯ROL(ElemType?數據[56],?int?時間);
int?DES_IP_Transform(ElemType?數據[64]);
int?DES _ IP _ 1 _ Transform(elem type?數據[64]);
int?DES_E_Transform(ElemType?數據[48]);
int?DES_P_Transform(ElemType?數據[32]);
int?DES_SBOX(ElemType?數據[48]);
int?DES_XOR(ElemType?R[48],?ElemType?L[48],int?計數);
int?DES_Swap(ElemType?左[32],ElemType?右[32]);
int?DES_EncryptBlock(ElemType?平原街區[8],?ElemType?子項[16][48],?ElemType?密碼塊[8]);
int?DES_DecryptBlock(ElemType?密碼塊[8],?ElemType?子項[16][48],?ElemType?plain block[8]);
int?DES_Encrypt(char?*普通文件,?夏爾?*keyStr,char?* cipher file);
int?DES_Decrypt(char?*密碼文件,?夏爾?*keyStr,char?* plain file);
/*字節轉換為二進制*/
int?ByteToBit(ElemType?ch,?ElemType?位[8]){
int?cnt
for(cnt?=?0;cnt?& lt?8;?cnt++){
*(位+計數)?=?(ch & gt& gtCNT)& amp;1;
}
回歸?0;
}
/*二進制到字節*/
int?BitToByte(ElemType?位[8],ElemType?*ch){
int?cnt
for(cnt?=?0;cnt?& lt?8;?cnt++){
*ch?|=?*(位?+?CNT)& lt;& ltcnt
}
回歸?0;
}
/*將長度為8的字符串轉換為二進制位字符串*/
int?Char8ToBit64(ElemType?ch[8],ElemType?位[64]){
int?cnt
for(cnt?=?0;?cnt?& lt?8;?cnt++){
ByteToBit(*(ch+cnt),bit+(CNT & lt;& lt3));
}
回歸?0;
}
/*將二進制位字符串轉換為長度為8的字符串*/
int?Bit64ToChar8(ElemType?位[64],ElemType?ch[8]){
int?cnt
memset(ch,0,8);
for(cnt?=?0;?cnt?& lt?8;?cnt++){
BitToByte(bit+(CNT & lt;& lt3)、ch+CNT);
}
回歸?0;
}
/*生成子項*/
int?DES_MakeSubKeys(ElemType?key[64],ElemType?子項[16][48]){
ElemType?溫度[56];
int?cnt
DES_PC1_Transform(key,temp);/*PC1替換*/
for(cnt?=?0;?cnt?& lt?16;?Cnt++){/*16輪替換,產生16個子鍵*/
DES_ROL(temp,MOVE _ TIMES[CNT]);/*向左循環*/
DES_PC2_Transform(temp,subKeys[CNT]);/*PC2置換以生成子密鑰*/
}
回歸?0;
}
/*密鑰排列1*/
int?DES _ PC 1 _ Transform(elem type?鍵[64],?ElemType?tempbts[56]){
int?cnt?
for(cnt?=?0;?cnt?& lt?56;?cnt++){
tempbts[cnt]?=?key[PC _ 1[CNT]];
}
回歸?0;
}
/*密鑰排列2*/
int?DES_PC2_Transform(ElemType?鍵[56],?ElemType?tempbts[48]){
int?cnt
for(cnt?=?0;?cnt?& lt?48;?cnt++){
tempbts[cnt]?=?key[PC _ 2[CNT]];
}
回歸?0;
}
/*向左循環*/
int?德斯ROL(ElemType?數據[56],?int?時間){
ElemType?溫度[56];
/*保存要循環向右移動的位*/
memcpy(溫度、數據、時間);
memcpy(temp+time,data+28,time);
/*前28位移位*/
memcpy(數據,數據+時間,28次);
memcpy(data+28-time,temp,time);
/*移動最後28位*/
memcpy(數據+28,數據+28+時間,28-時間);
memcpy(data+56-time,temp+time,time);?
回歸?0;
}
/*IP更換*/
int?DES_IP_Transform(ElemType?數據[64]){
int?cnt
ElemType?溫度[64];
for(cnt?=?0;?cnt?& lt?64;?cnt++){
臨時[計數]?=?data[IP _ Table[CNT]];
}
memcpy(數據,溫度,64);
回歸?0;
}
/*IP逆置換*/
int?DES _ IP _ 1 _ Transform(elem type?數據[64]){
int?cnt
ElemType?溫度[64];
for(cnt?=?0;?cnt?& lt?64;?cnt++){
臨時[計數]?=?data[IP _ 1 _ Table[CNT]];
}
memcpy(數據,溫度,64);
回歸?0;
}
/*擴展置換*/
int?DES_E_Transform(ElemType?數據【48】){
int?cnt
ElemType?溫度[48];
for(cnt?=?0;?cnt?& lt?48;?cnt++){
臨時[計數]?=?data[E _ Table[CNT]];
}
memcpy(數據,溫度,48);
回歸?0;
}
/*P置換*/
int?DES_P_Transform(ElemType?數據[32]){
int?cnt
ElemType?溫度[32];
for(cnt?=?0;?cnt?& lt?32;?cnt++){
臨時[計數]?=?data[P _ Table[CNT]];
}
memcpy(數據,溫度,32);
回歸?0;
}
/*異或*/
int?DES_XOR(ElemType?R[48],?ElemType?L[48]?,int?計數){
int?cnt
for(cnt?=?0;?cnt?& lt?數數;?cnt++){
R[cnt]?^=?l[CNT];
}
回歸?0;
}
/*S盒更換*/
int?DES_SBOX(ElemType?數據【48】){
int?cnt
int?行,行,輸出;
int?cur1,cur2
for(cnt?=?0;?cnt?& lt?8;?cnt++){
cur1?=?CNT * 6;
cur2?=?cnt & lt& lt2;
/*計算S框中的行和列*/
線?=?(data[cur 1]& lt;& lt1)?+?data[cur 1+5];
劃?=?(data[cur 1+1]& lt;& lt3)?+?(data[cur 1+2]& lt;& lt2)
+?(data[cur 1+3]& lt;& lt1)?+?data[cur 1+4];
輸出?=?s[CNT][line][row];
/*到二進制*/
數據[cur2]?=?(輸出& amp0X08)>& gt3;
data[cur2+1]?=?(輸出& amp0X04)>& gt2;
數據[cur2+2]?=?(輸出& amp0X02)>& gt1;
數據[cur2+3]?=?輸出與輸出。0x 01;
}
回歸?0;
}
/*交換*/
int?DES_Swap(ElemType?左[32],?ElemType?右[32]){
ElemType?溫度[32];
memcpy(溫度,左側,32);
memcpy(左,右,32);
memcpy(右,溫度,32);
回歸?0;
}
/*加密單個數據包*/
int?DES_EncryptBlock(ElemType?平原街區[8],?ElemType?子項[16][48],?ElemType?密碼塊[8]){
ElemType?平原位[64];
ElemType?版權[48];
int?cnt
Char8ToBit64(plainBlock,plain bits);
/*初始替換(IP替換)*/
DES _ IP _ Transform(plain bits);
/*16次叠代*/
for(cnt?=?0;?cnt?& lt?16;?cnt++){?
memcpy(版權所有,plainBits+32,32);
/*將右半部分從32位擴展到48位*/
DES_E_Transform(版權所有);
/*將右半部分與子密鑰進行異或運算*/
DES_XOR(版權所有,subKeys[cnt],48);?
/* XOR結果進入S盒並輸出32位結果*/
DES_SBOX(版權所有);
/*P置換*/
DES_P_Transform(版權所有);
/*對明文的左右部分進行異或運算*/
DES_XOR(plainBits,版權,32);
如果(cnt?!=?15){
/*最後完成左右部分的交換*/
DES_Swap(plainBits,plain bits+32);
}
}
/*逆初始排列(IP 1排列)*/
DES _ IP _ 1 _ Transform(plain bits);
Bit64ToChar8(明文位,密碼塊);
回歸?0;
}
/*解密單個數據包*/
int?DES_DecryptBlock(ElemType?密碼塊[8],?ElemType?子項[16][48],ElemType?plainBlock[8]){
ElemType?密碼位[64];
ElemType?版權[48];
int?cnt
Char8ToBit64(密碼塊,密碼位);?
/*初始替換(IP替換)*/
DES_IP_Transform(密碼位);
/*16次叠代*/
for(cnt?=?15;?cnt?& gt=?0;?cnt - ){
memcpy(版權,cipherBits+32,32);
/*將右半部分從32位擴展到48位*/
DES_E_Transform(版權所有);
/*將右半部分與子密鑰進行異或運算*/
DES_XOR(版權所有,subKeys[cnt],48);
/* XOR結果進入S盒並輸出32位結果*/
DES_SBOX(版權所有);
/*P置換*/
DES_P_Transform(版權所有);
/*對明文的左右部分進行異或運算*/
DES_XOR(cipherBits,版權,32);
如果(cnt?!=?0){
/*最後完成左右部分的交換*/
DES_Swap(密碼位,密碼位+32);
}
}
/*逆初始排列(IP 1排列)*/
DES_IP_1_Transform(密碼位);
Bit64ToChar8(cipherBits,plain block);
回歸?0;
}
/*加密文件*/
int?DES_Encrypt(char?*普通文件,?夏爾?*keyStr,char?*密碼文件){
文件?*普通,*密碼;
int?數數;
ElemType?明文塊[8],密碼塊[8],密鑰塊[8];
ElemType?bKey[64];
ElemType?子項[16][48];
如果((平原?=?fopen(plainFile,“rb”)?==?NULL){
回歸?普通文件打開錯誤;
}
如果((密碼?=?fopen(cipherFile,“wb”)?==?NULL){
回歸?密碼_文件_打開_錯誤;
}
/*設置密鑰*/
memcpy(keyBlock,keyStr,8);
/*將密鑰轉換為二進制流*/
Char8ToBit64(keyBlock,bKey);
/*生成子項*/
DES_MakeSubKeys(bKey,subKeys);
而(!feof(plain)){
/*壹次讀取8個字節,返回成功讀取的字節數*/
如果((算嗎?=?fread(plainBlock,sizeof(char),8,plain))?==?8){
DES_EncryptBlock(plainBlock,subKeys,cipher block);
fwrite(cipherBlock,sizeof(char),8,密碼);
}
}
如果(計數){
/*填充*/
memset(plainBlock?+?計數,' \0 ',7?-?計數);
/*最後壹個字符保存包括最後壹個字符在內的填充字符數*/
平原街區[7]?=?8?-?數數;
DES_EncryptBlock(plainBlock,subKeys,cipher block);
fwrite(cipherBlock,sizeof(char),8,密碼);
}
fclose(素色);
fclose(密碼);
回歸?OK;
}
/*解密文件*/
int?DES_Decrypt(char?*密碼文件,?夏爾?*keyStr,char?*plainFile){
文件?*素色,?*密碼;
int?數數,次數?=?0;
龍?fileLen
ElemType?明文塊[8],密碼塊[8],密鑰塊[8];
ElemType?bKey[64];
ElemType?子項[16][48];
如果((密碼?=?fopen(cipherFile,“rb”)?==?NULL){
回歸?密碼_文件_打開_錯誤;
}
如果((平原?=?fopen(plainFile,“wb”)?==?NULL){
回歸?普通文件打開錯誤;
}
/*設置密鑰*/
memcpy(keyBlock,keyStr,8);
/*將密鑰轉換為二進制流*/
Char8ToBit64(keyBlock,bKey);
/*生成子項*/
DES_MakeSubKeys(bKey,subKeys);
/*取文件長度?*/
fseek(cipher,0,SEEK _ END);/*尾文件指針*/
fileLen?=?ftell(密碼);?/*獲取文件指針的當前位置*/
倒帶(密碼);?/*將文件指針重定向到文件頭*/
while(1){
/*密文的字節數必須是8的整數倍*/
fread(cipherBlock,sizeof(char),8,密碼);
DES_DecryptBlock(cipherBlock,subKeys,plain block);
時代?+=?8;
如果(次?& lt?fileLen){
fwrite(plainBlock,sizeof(char),8,plain);
}
否則{
打破;
}
}
/*判斷末端是否填充*/
if(plainBlock[7]?& lt?8){
對於(伯爵?=?8?-?普通砌塊[7];?數數?& lt?7;?count++){
if(plainBlock[count]?!=?'\0'){
打破;
}
}
}
如果(算嗎?==?7){/*已填充*/
fwrite(plainBlock,sizeof(char),8?-?plainBlock[7],平原);
}
Else{/*無填充*/
fwrite(plainBlock,sizeof(char),8,plain);
}
fclose(素色);
fclose(密碼);
回歸?OK;
}
int?主()
{
clock_t?甲、乙;
答?=?clock();
DES_Encrypt("1.txt "," key.txt "," 2 . txt ");
b?=?clock();
Printf("加密需要%d毫秒\n ",b-a);
系統(“暫停”);
答?=?clock();
DES_Decrypt("2.txt "," key.txt "," 3 . txt ");
b?=?clock();
Printf("解密需要%d毫秒\n ",b-a);
getchar();
回歸?0;
}