如何让自己通过“CIN”输入字符串，而不是在程序代码（“Message”，“PWD”）中输入数据？ 我需要做一个从字符串到无符号char的转换，但我不知道怎么做。 代码本身就是实现RC4的尝试。
#include <iostream>
#include <string.h>
using namespace std;
void rc4(unsigned char * ByteInput, unsigned char * pwd,
unsigned char * &ByteOutput){
unsigned char * temp;
int i,j=0,t,tmp,tmp2,s[256], k[256];
for (tmp=0;tmp<256;tmp++){
s[tmp]=tmp;
k[tmp]=pwd[(tmp % strlen((char *)pwd))];
}
for (i=0;i<256;i++){
j = (j + s[i] + k[i]) % 256;
tmp=s[i];
s[i]=s[j];
s[j]=tmp;
}
temp = new unsigned char [ (int)strlen((char *)ByteInput) + 1 ] ;
i=j=0;
for (tmp=0;tmp<(int)strlen((char *)ByteInput);tmp++){
i = (i + 1) % 256;
j = (j + s[i]) % 256;
tmp2=s[i];
s[i]=s[j];
s[j]=tmp2;
t = (s[i] + s[j]) % 256;
if (s[t]==ByteInput[tmp])
temp[tmp]=ByteInput[tmp];
else
temp[tmp]=s[t]^ByteInput[tmp];
}
temp[tmp]='\0';
ByteOutput=temp;
}
int main()
{
unsigned char * message;
unsigned char * pwd;
unsigned char * encrypted;
unsigned char * decrypted;
message=(unsigned char *)"Hello world!";
pwd=(unsigned char *)"abc";
rc4(message,pwd,encrypted);
rc4(encrypted,pwd,decrypted);
cout<<"Test"<<endl<<endl;
cout<<"Message: "<<message<<endl;
cout<<"Password: "<<pwd<<endl;
cout<<"Message encrypted: "<<encrypted<<endl;
cout<<"Message decrypted: "<<decrypted<<endl;
return 0;
}
std::string具有一个.c_str()成员函数，该函数将常量char*返回到内部字符串。 您可以使用reinterpret_cast将其强制转换为常量无符号字符*。 示例:
#include <string> // string not string.h
std::string message;
std::getline (std::cin, message);
const unsigned char* msg = reinterpret_cast<const unsigned char*>(message.c_str());
这个程序现在通过CIN接受输入。
#include <iostream>
#include <string.h>
using namespace std;
void rc4(unsigned char * ByteInput, unsigned char * pwd,
unsigned char * &ByteOutput) {
unsigned char * temp;
int i, j = 0, t, tmp, tmp2, s[256], k[256];
for (tmp = 0; tmp<256; tmp++) {
s[tmp] = tmp;
k[tmp] = pwd[(tmp % strlen((char *)pwd))];
}
for (i = 0; i<256; i++) {
j = (j + s[i] + k[i]) % 256;
tmp = s[i];
s[i] = s[j];
s[j] = tmp;
}
temp = new unsigned char[(int)strlen((char *)ByteInput) + 1];
i = j = 0;
for (tmp = 0; tmp<(int)strlen((char *)ByteInput); tmp++) {
i = (i + 1) % 256;
j = (j + s[i]) % 256;
tmp2 = s[i];
s[i] = s[j];
s[j] = tmp2;
t = (s[i] + s[j]) % 256;
if (s[t] == ByteInput[tmp])
temp[tmp] = ByteInput[tmp];
else
temp[tmp] = s[t] ^ ByteInput[tmp];
}
temp[tmp] = '\0';
ByteOutput = temp;
}
int main()
{
unsigned char * message= new unsigned char[1024]();
unsigned char * pwd= new unsigned char[1024]();
unsigned char * encrypted;
unsigned char * decrypted;
cout << "enter message \n";
cin >> message;
cout << "enter password \n";
cin >> pwd;
rc4(message, pwd, encrypted);
rc4(encrypted, pwd, decrypted);
cout << "Test" << endl << endl;
cout << "Message: " << message << endl;
cout << "Password: " << pwd << endl;
cout << "Message encrypted: " << encrypted << endl;
cout << "Message decrypted: " << decrypted << endl;
system("pause");
return 0;
}
