DES.rar_DES .bmp_DES加密图片

#include "des.h" #include "inter.h" #include "util.h" #include "compress.h" void RawToMature(char * RawKey,int * MatureKey,int * KeyLeft,int * KeyRight,int * KeyA,int * KeyB) { int temp; int buffer[64]; for(int i=0;i<8;i++) { temp = (int)RawKey[i]; DecToBin(temp,&MatureKey[i*8],8); } //64位密钥置换,去除第8,16,24,32,40,48,56,64校验位,生成56位密钥 for(int i=0;i<28;i++) { buffer[i] = MatureKey[KeyLeft[i]-1]; } for(int i=0;i<28;i++) { buffer[i+28] = MatureKey[KeyRight[i]-1]; } BufferCopy(KeyA,buffer,28); BufferCopy(KeyB,&buffer[28],28); } void GenKey(int times,int * KeyA,int * KeyB,int * Rotate,int * KeyTemp,int * Diagram,int * KEY[]) { KeyLeftShift(KeyA,Rotate[times]); KeyLeftShift(KeyB,Rotate[times]); BufferCopy(KeyTemp,KeyA,28); BufferCopy(&KeyTemp[28],KeyB,28); KEY[times] = (int *)malloc(48*sizeof(int)); printf("\nKEY[%2d]\n",times); for(int i=0;i<48;i++) { KEY[times][i] = KeyTemp[Diagram[i]-1]; printf("%d",KEY[times][i]); } putchar('\n'); } void DataProcess(unsigned char OldData[],int Temp64[],int Replacement[],int ExRight[],int * KEY[],Mode mode) { int temp; int NewData[64],cipher[64],CipherTemp[64]; int Left[32],RightTemp[32],RightExtension[48],Right[32]; for(int i=0;i<8;i++) { temp = (int)OldData[i]; DecToBin(temp,&Temp64[i*8],8); } for(int i=0;i<64;i++) { NewData[i] = Temp64[Replacement[i]-1]; } BufferCopy(Left,NewData,32); BufferCopy(Right,&NewData[32],32); switch(mode) { case Encryption: for(int p=0;p<16;p++) { for(int i=0;i<48;i++) { RightExtension[i] = Right[ExRight[i]-1]; } BufferCopy(RightTemp,Right,32); for(int i=0;i<48;i++) { RightExtension[i] = RightExtension[i]^KEY[p][i]; } SixToFour(Right,RightExtension,Compress1,Compress2,Compress3,Compress4,Compress5,Compress6,Compress7,Compress8); for(int i=0;i<32;i++) { Right[i] = RightTemp[ReRight[i]-1]; } for(int i=0;i<32;i++) { Right[i] = Left[i]^Right[i]; Left[i] = RightTemp[i]; } } break; case Decryption: for(int p=15;p>=0;p--) { for(int i=0;i<48;i++) { RightExtension[i] = Right[ExRight[i]-1]; } BufferCopy(RightTemp,Right,32); for(int i=0;i<48;i++) { RightExtension[i] = RightExtension[i]^KEY[p][i]; } SixToFour(Right,RightExtension,Compress1,Compress2,Compress3,Compress4,Compress5,Compress6,Compress7,Compress8); for(int i=0;i<32;i++) { Right[i] = RightTemp[ReRight[i]-1]; } for(int i=0;i<32;i++) { Right[i] = Left[i]^Right[i]; Left[i] = RightTemp[i]; } } break; default: printf("Error!\n"); } //将生成的密文存入cipher[64]中，然后转化为十进制存入文件 BufferCopy(cipher,Right,32); BufferCopy(&cipher[32],Left,32); BufferCopy(CipherTemp,cipher,64); for(int i=0;i<64;i++) { cipher[i] = CipherTemp[Inverse[i]-1]; } for(int i=0;i<=56;i=i+8) { temp = BinToDec(&cipher[i],8); printf("%3d ",temp); fputc((unsigned char)temp,pic_fp); } putchar('\n'); } void DataPretreat(unsigned char OldData[],int * KEY[],Mode mode) { FILE * fp; char ch; int pos = 0,counter=0; int len,rest,total; char name[32]; printf("Input PICTURE File Name(.bmp):"); scanf("%s",name); if((fp = fopen(name,"rb")) == NULL) { printf("Error!Can not open file!\n"); exit(0); } len = GetFileLen(fp); total = len/8; rest = len%8; printf("LEN:%d,Total:%d,Rest:%d\n",len,total,rest); fseek(fp,0,SEEK_SET); if(mode == Encryption) { if((pic_fp = fopen("cipher.bmp","ab+")) == NULL) { printf("Error:Can not open file cipher.bmp"); } } else { if((pic_fp = fopen("plaint.bmp","ab+")) == NULL) { printf("Error:Can not open file cipher.bmp"); } } for(int i=0;i<54;i++) { ch = fgetc(fp); fputc((unsigned char)ch,pic_fp); } while(total--) { pos = 0; while((pos+1) % 9) { ch = fgetc(fp); OldData[pos++] = (unsigned char)ch; } printf("Counter:%d\t",++counter); DataProcess(OldData,Temp64,Replacement,ExRight,KEY,mode); } for(int i=0;i<rest;i++) { ch = fgetc(fp); fputc((unsigned char)ch,pic_fp); } fclose(fp); fclose(pic_fp); } void SixToFour(int Right[],int RightExtension[],int Compress1[][16],int Compress2[][16],int Compress3[][16],int Compress4[][16],int Compress5[][16],int Compress6[][16],int Compress7[][16],int Compress8[][16]) { int row,column,temp,buffer[4],times=0,j=0; int UnitTwo[2],UnitFour[4]; for(int i=0;i<=42;i=i+6) { times++; StringCopy(UnitTwo,RightExtension,i,i); StringCopy(&UnitTwo[1],RightExtension,i+5,i+5); StringCopy(UnitFour,RightExtension,i+1,i+4); row = BinToDec(UnitTwo,2); column = BinToDec(UnitFour,4); switch(times) { case 1: temp = Compress1[row][column]; break; case 2: temp = Compress2[row][column]; break; case 3: temp = Compress3[row][column]; break; case 4: temp = Compress4[row][column]; break; case 5: temp = Compress5[row][column]; break; case 6: temp = Compress6[row][column]; break; case 7: temp = Compress7[row][column]; break; default: temp = Compress8[row][column]; break; } DecToBin(temp,buffer,4); BufferCopy(&Right[j],buffer,4); j=j+4; } }