Last active
April 5, 2019 18:10
-
-
Save itorain/6131ef52e694692a9d0557ccfb9b2641 to your computer and use it in GitHub Desktop.
C++ LCG
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#include <iostream> | |
#include <memory> | |
using namespace std; | |
typedef unsigned char BYTE; | |
int M = 0xA5; | |
int A = 0xc9; | |
int N = 256; | |
int init = 0x55; | |
BYTE *LCG(BYTE *data, int dataLength, BYTE seed) { | |
int prev; | |
BYTE *val = new BYTE[dataLength]; | |
for (int i = 0; i < dataLength; i++) { | |
if (i == 0) { | |
prev = ((M * (int)seed) + A) % N; | |
} | |
else { | |
prev = ((M * (int)prev) + A) % N; | |
} | |
val[i] = (BYTE)prev^data[i]; | |
} | |
return val; | |
} | |
int main(int argc, char* argv[]) { | |
BYTE word[] = "apple"; | |
BYTE *x = LCG(word, 5, (BYTE)init); | |
BYTE keyedWord[] = {0xF3, 0x93, 0x68, 0x2D, 0xCB}; | |
for (int i = 0; i < 5; i++) { | |
cout << hex << (int)x[i] << endl; | |
} | |
BYTE *y = LCG(x, 5, (BYTE)init); | |
for (int i = 0; i < 5; i++) { | |
cout << y[i] << endl; | |
} | |
delete x; | |
delete y; | |
return 0; | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment