#include "Crypto.h"#include <stdio.h>#include <string.h>void Crypto::XORrecoder(unsigned char* Data, unsigned long Len_D, unsigned char key){for (size_t i = 0; i < Len_D; i++){Data[i] ^= key;}}void __forceinline rc4_init(unsigned char* s, unsigned char* key, unsigned long Len_k){int i = 0, j = 0;char k[256] = { 0 };unsigned char tmp = 0;for (i = 0; i < 256; i++) {s[i] = i;k[i] = key[i % Len_k];}for (i = 0; i < 256; i++) {j = (j + s[i] + k[i]) % 256;tmp = s[i];s[i] = s[j];s[j] = tmp;}}void Crypto::rc4_crypt(unsigned char* Data, unsigned long Len_D, unsigned char* key, unsigned long Len_k){unsigned char s[256];rc4_init(s, key, Len_k);int i = 0, j = 0, t = 0;unsigned long k = 0;unsigned char tmp;for (k = 0; k < Len_D; k++) {i = (i + 1) % 256;j = (j + s[i]) % 256;tmp = s[i];s[i] = s[j];s[j] = tmp;t = (s[i] + s[j]) % 256;Data[k] = Data[k] ^ s[t];}}
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