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详细说明： DES算法的C语言代码及实现 首先新建头文件des_encode.H 内容如下： void EncodeMain(); //EncodeMain function void DecodeMain(); //Sorry ,it has not used void Decode(int *str,int *keychar); //decode :input 8 chars,8 keychars void Encode(int *str,int *keychar); //encode: input 8 chars,8 keychars void keyBuild(int *keychar); //create key array void StrtoBin(int *midkey,int *keychar); //change into binary void keyCreate(int *midkey2,int movebit,int i); //call by keyBuild void EncodeData(int *lData,int *rData,int *srt); //encodedata function void F(int *rData,int *key); //F function void Expand(int *rData,int *rDataP); //Expand function void ExchangeS(int *rDataP,int *rData); //S-diagram change void ExchangeP(int *rData); //P change void FillBin(int *rData,int n,int s); // data to binary;call by S-Diagram change function void DecodeData(int *str,int *lData,int *rData); //DecodeData from binary int IP1[]={58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4, //initial change 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, }; int IP2[]={40, 8, 48, 16, 56, 24, 64, 32, 39, 7, 47, 15, 55, 23, 63, 31, //opp initial change 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 }; int s[][4][16]={{ //S-diagram array {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} }, { {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} }, { {13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7}, {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} } }; int Ex[48]={ 32,1,2,3,4,5, //Expand array 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 }; int P[32]={16,7,20,21, //P-change 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 }; int PC1[56]={57,49,41,33,25,17,9, //PC-1 in keyBuild 1,58,50,42,34,26,18, 10,2,59,51,43,35,27, 19,11,3,60,52,44,36, 63,55,47,39,31,33,15, 7,62,54,46,38,30,22, 14,6,61,53,45,37,29, 21,13,5,28,20,12,4 }; int PC2[48]={14,17,11,24,1,5, //PC-2 in keyBuild 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 }; 再创建des.cpp 内容如下： #include #include #include"des_encode.h" int key[16][48]; char str[8]; void main() //main function { EncodeMain(); } void EncodeMain() //EncodeMain function { int i; char keychar[8]; int key2[8]; int strkey[8]; printf("请输入8个要加密的字符：\n"); for(i=0;i<8;i++) scanf("%c",&str[i]); getchar(); for(i=0;i<8;i++) strkey[i]=str[i]; printf("\n输入明文的十六进制为:\n"); for(i=0;i<8;i++) printf("%10x",strkey[i]); printf("\n请输入密钥(8个字符):\n"); for(i=0;i<8;i++) scanf("%c",&keychar[i]); for(i=0;i<8;i++) key2[i]=keychar[i]; getchar(); // printf("%c",keychar[i]); Encode(strkey,key2); printf("\n加密后十六进制密文是:\n"); for(i=0;i<8;i++) printf("%10x",strkey[i]); printf("\n\n清输入解密密码\n"); for(i=0;i<8;i++) scanf("%c",&keychar[i]); for(i=0;i<8;i++) key2[i]=keychar[i]; Decode(strkey,key2); for(i=0;i<8;i++) printf("%10x",strkey[i]); for(i=0;i<8;i++) str[i]=strkey[i]; printf("\n明文为：\t"); for(i=0;i<8;i++) printf("%c",str[i]); printf("\n\n"); } void keyBuild(int *keychar){ //create key array int i,j; int movebit[]={1,1,2,2,2,2,2,2, 1,2,2,2,2,2,2,1}; int midkey2[56]; int midkey[64]; StrtoBin(midkey,keychar); for(i=0;i<56;i++) midkey2[i]=midkey[PC1[i]-1]; for(i=0;i<16;i++) keyCreate(midkey2,movebit[i],i); } void StrtoBin(int *midkey,int *keychar){ //change into binary int trans[8],i,j,k,n; n=0; for(i=0;i<8;i++){ j=0; while(keychar[i]!=0){ trans[j]=keychar[i]%2; keychar[i]=keychar[i]/2; j++; } for(k=j;k<8;k++)trans[k]=0; for(k=0;k<8;k++) midkey[n++]=trans[7-k]; } } void keyCreate(int *midkey2,int movebit,int n){ int i,temp[4]; temp[0]=midkey2[0]; temp[1]=midkey2[1]; temp[2]=midkey2[28]; temp[3]=midkey2[29]; if(movebit==2){ for(i=0;i<26;i++){ midkey2[i]=midkey2[i+2]; midkey2[i+28]=midkey2[i+30]; } midkey2[26]=temp[0];midkey2[27]=temp[1]; midkey2[54]=temp[2];midkey2[55]=temp[3]; } else { for(i=0;i<27;i++){ midkey2[i]=midkey2[i+1]; midkey2[i+28]=midkey2[i+29]; } midkey2[27]=temp[0];midkey2[55]=temp[2]; } for(i=0;i<48;i++) key[n][i]=midkey2[PC2[i]-1]; } void EncodeData(int *lData,int *rData,int *str){ //encodedata function int i,j,temp[8],lint,rint;//int h; int data[64]; lint=0,rint=0; for(i=0;i<4;i++){ j=0; while(str[i]!=0){ temp[j]=str[i]%2; str[i]=str[i]/2; j++; } while(j<8)temp[j++]=0; for(j=0;j<8;j++) lData[lint++]=temp[7-j]; j=0; while(str[i+4]!=0){ temp[j]=str[i+4]%2; str[i+4]=str[i+4]/2; j++; } while(j<8)temp[j++]=0; for(j=0;j<8;j++)rData[rint++]=temp[7-j]; } for(i=0;i<32;i++){ data[i]=lData[i]; data[i+32]=rData[i]; } for(i=0;i<32;i++){ lData[i]=data[IP1[i]-1];//printf("P1:%5d:%5d,%5d\n",IP1[i],lData[i],data[IP1[i]-1]); rData[i]=data[IP1[i+32]-1]; } } void F(int *rData,int *key){ //F function int i,rDataP[48]; Expand(rData,rDataP); for(i=0;i<48;i++){ rDataP[i]=rDataP[i]^key[i];// printf("%10d",rDataP[i]);if((i+1)%6==0)printf("\n"); } ExchangeS(rDataP,rData); ExchangeP(rData); } void Expand(int *rData,int *rDataP){ //Expand function int i; for(i=0;i<48;i++) rDataP[i]=rData[Ex[i]-1]; } void ExchangeS(int *rDataP,int *rData){ //S-diagram change int i,n,linex,liney; linex=liney=0; for(i=0;i<48;i+=6){ n=i/6; //printf("%10d\n",(rDataP[i]<<1)); linex=(rDataP[i]<<1)+rDataP[i+5]; liney=(rDataP[i+1]<<3)+(rDataP[i+2]<<2)+(rDataP[i+3]<<1)+rDataP[i+4]; FillBin(rData,n,s[n][linex][liney]); } } void ExchangeP(int *rData){ //P change int i,temp[32]; for(i=0;i<32;i++) temp[i]=rData[i]; for(i=0;i<32;i++) rData[i]=temp[P[i]-1]; } void FillBin(int *rData,int n,int s){ // data to binary;call by S-Diagram change function int temp[4],i; for(i=0;i<4;i++){ temp[i]=s%2; s=s/2; } for(i=0;i<4;i++) rData[n*4+i]=temp[3-i]; } void DecodeData(int *str,int *lData,int *rData){ //DecodeData from binary int i;int a,b;int data[64]; a=0,b=0; for(i=0;i<32;i++){ data[i]=lData[i]; data[i+32]=rData[i]; } for(i=0;i<32;i++){ lData[i]=data[IP2[i]-1]; rData[i]=data[IP2[i+32]-1]; } for(i=0;i<32;i++){ a=(lData[i]&0x1)+(a<<1); b=(rData[i]&0x1)+(b<<1); if((i+1)%8==0){ str[i/8]=a;a=0;//printf("%d",i/8); str[i/8+4]=b;b=0;//printf("%d",i/8+4); } } } void Encode(int *str,int *keychar){ //encode: input 8 chars,8 keychars int lData[32],rData[32],temp[32],rDataP[48]; int i,j; keyBuild(keychar); EncodeData(lData,rData,str); for(i=0;i<16;i++){ for(j=0;j<32;j++) temp[j]=rData[j]; F(rData,key[i]); for(j=0;j<32;j++){ rData[j]=rData[j]^lData[j]; } for(j=0;j<32;j++) lData[j]=temp[j]; } DecodeData(str,rData,lData); } void Decode(int *str,int *keychar){ //decode :input 8 chars,8 keychars int lData[32],rData[32],temp[32],rDataP[48]; int i,j; keyBuild(keychar); EncodeData(lData,rData,str); //这个位置 for(i=0;i<16;i++){ for(j=0;j<32;j++) temp[j]=rData[j]; F(rData,key[15-i]); for(j=0;j<32;j++){ rData[j]=rData[j]^lData[j]; } for(j=0;j<32;j++){ lData[j]=temp[j]; } } DecodeData(str,rData,lData); } ...展开收缩
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