RC4加解密

#include<stdio.h>/*
RC4初始化函数
*/
void 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;}
}/*
RC4加解密函数
unsigned char* Data     加解密的数据
unsigned long Len_D     加解密数据的长度
unsigned char* key      密钥
unsigned long Len_k     密钥长度
*/
void rc4_crypt(unsigned char* Data, unsigned long Len_D, unsigned char* key, unsigned long Len_k) //加解密
{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];}
}
void main()
{//字符串密钥unsigned char key[] = "zstuctf";unsigned long key_len = sizeof(key) - 1;//数组密钥//unsigned char key[] = {};//unsigned long key_len = sizeof(key);//加解密数据unsigned char data[] = { 0x7E, 0x6D, 0x55, 0xC0, 0x0C, 0xF0, 0xB4, 0xC7, 0xDC, 0x45,0xCE, 0x15, 0xD1, 0xB5, 0x1E, 0x11, 0x14, 0xDF, 0x6E, 0x95,0x77, 0x9A, 0x12, 0x99 };//加解密rc4_crypt(data, sizeof(data), key, key_len);for (int i = 0; i < sizeof(data); i++){printf("%c", data[i]);}printf("\n");return;
}
//zstuctf{xXx_team_Is_GooD