大家看看我的加密算法 - Chinaunix

#include <stdlib.h>
#include <time.h>
#ifndef _RDEA_CPP_
#define _RDEA_CPP_
#define BYTE unsigned char
#define NUM unsigned
class Ckey {
private:
BYTE key[32];
NUM GetOffset(void);
public:
Ckey(char*);
BYTE *Encrypt(char*,NUM);
BYTE *Decrypt(char*,NUM);
};
Ckey::Ckey(char *InputKey){
NUM i;
for(i=0;i<32;i++){
if ((*InputKey)!=0) {
key[i]=(BYTE)(*InputKey++);
}else{
key[i]=0;
}
}
}
BYTE *Ckey::Encrypt(char *text,NUM size){
BYTE RandomKey[32],*Codec;
NUM i,Offset;
srand((NUM)time(NULL));
for(i=0;i<32;i++){
RandomKey[i]=rand()%256;
}
if (text==NULL) {
return 0;
}
Codec = new BYTE[32+size];
Offset=((size-1)*(GetOffset()-1))%(size);
for(i=0;i<31+size;i++){
if (i<Offset) {
if (RandomKey[i%32]%2==1) {
Codec[i]=(BYTE)text[i]^RandomKey[i%32];
}else{
Codec[i]=(BYTE)text[i]^key[i%32];
}
}else if(i>=Offset+32){
if (RandomKey[i%32]%2==1) {
Codec[i]=(BYTE)text[i-32]^RandomKey[i%32];
}else{
Codec[i]=(BYTE)text[i-32]^key[i%32];
}
}else{
Codec[i]=RandomKey[i-Offset]^key[i-Offset];
}
}
Codec[size+31]='\0';
return Codec;
}
BYTE *Ckey::Decrypt(char *Codec,NUM size){
BYTE RandomKey[32],*text;
NUM i,Offset,;
if (size<32||Codec==NULL) {
return NULL;
}
text=new BYTE[size-32];
Offset=((size-33)*(GetOffset()-1))%(size-32);
for(i=0;i<size-1;i++){
if ((Offset<=i)&&(i<Offset+32)){
RandomKey[i-Offset]=(BYTE)Codec[i]^key[i-Offset];
}
}
for(i=0;i<size-1;i++){
if (i<Offset){
if (RandomKey[i%32]%2==1) {
text[i]=(BYTE)Codec[i]^RandomKey[i%32];
}else{
text[i]=(BYTE)Codec[i]^key[i%32];
}
}else if(i>=Offset+32){
if (RandomKey[i%32]%2==1) {
text[i-32]=(BYTE)Codec[i]^RandomKey[i%32];
}else{
text[i-32]=(BYTE)Codec[i]^key[i%32];
}
}
}
text[size-33]='\0';
return text;
}
NUM Ckey::GetOffset(){
NUM i,Offset;
for(i=0,Offset=0;i<32;i++)
Offset+=key[i];
for(i=0;i<16;i++)
Offset+=key[i*2]^key[i*2+1];
for(i=0;i<8;i++)
Offset+=(key[i*4]&key[i*4+1])
^(key[i*4+2]&key[i*4+3]);
for(i=0;i<4;i++)
Offset+=((key[i*8]|key[i*8+1])
&(key[i*8+2]|key[i*8]+3))
^((key[i*8+4]|key[i*8+5])
&(key[i*8+6]|key[i*8+7]));
return Offset;
}
#undef BYTE
#undef NUM
#endif
#define _DEBUG_
/**********************************For Debug**************************************/
#ifdef _DEBUG_
#include <iostream.h>
int main(){
Ckey ckey("1234567890123456789012345678901");
char *a="this is a program written by THYNSON.it is use for encrypt or decrypt data.";
unsigned len=strlen(a)+1,i;
char *b,*c;
b=(char*)ckey.Encrypt(a,len);//加密得到密文
c=(char*)ckey.Decrypt(b,len+32); //解密密文得到明文
cout<<"密文： \n\n";
for(i=0;i<len+32;i++) cout<<b[i]; //之所以采用循环输出字符方式
cout<<"\n\n明文： \n\n"; //打出密文是因为加密是可能在
cout<<c; //某一位产生字符串结束标志，
cout<<"\n\n"; //导致密文输出与实际不符。
delete []b;
delete []c;
cin.get();
cin.get();
return 0;
}
#endif

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