【Java】元宵节
import java.io.UnsupportedEncodingException;import java.nio.charset.StandardCharsets;
import java.net.URL;
import java.io.BufferedReader;
import java.io.InputStreamReader;
public class Main
{
public static void main(String[] args)
{
Main t6=new Main();
String htmls= t6.getPageSource("http://bmob-cdn-11629.b0.upaiyun.com/2019/02/19/1483728040e51b2c80b9ddb4ad3c6ced.txt","utf8");
String decryStr = RC4Util.decryRC4(htmls, "happy");
System.out.println(decryStr);
}
public String getPageSource(String pageUrl,String encoding) {
StringBuffer sb = new StringBuffer();
try {
URL url = new URL(pageUrl);
BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream(), encoding));
String line;
while((line = in.readLine())!=null){
sb.append(line);
}in.close();}
catch (Exception ex) {
System.err.println(ex);
}
return sb.toString();
}
}
class RC4Util {
public static String decryRC4(String data, String key) {
if (data == null || key == null) {
return null;
}
return new String(RC4Base(HexString2Bytes(data), key), StandardCharsets.UTF_8);
}
private static byte[] initKey(String aKey) {
byte[] bkey = aKey.getBytes();
byte state[] = new byte;
for (int i = 0; i < 256; i++) {
state = (byte) i;
}
int index1 = 0;
int index2 = 0;
if (bkey.length == 0) {
return null;
}
for (int i = 0; i < 256; i++) {
index2 = ((bkey & 0xff) + (state & 0xff) + index2) & 0xff;
byte tmp = state;
state = state;
state = tmp;
index1 = (index1 + 1) % bkey.length;
}
return state;
}
private static byte[] HexString2Bytes(String src) {
int size = src.length();
byte[] ret = new byte;
byte[] tmp = src.getBytes(StandardCharsets.UTF_8);
for (int i = 0; i < size / 2; i++) {
ret = uniteBytes(tmp, tmp);
}
return ret;
}
private static byte uniteBytes(byte src0, byte src1) {
char _b0 = (char) Byte.decode("0x" + new String(new byte[]{src0})).byteValue();
_b0 = (char) (_b0 << 4);
char _b1 = (char) Byte.decode("0x" + new String(new byte[]{src1})).byteValue();
return (byte) (_b0 ^ _b1);
}
private static byte[] RC4Base(byte[] input, String mKkey) {
int x = 0;
int y = 0;
byte key[] = initKey(mKkey);
int xorIndex;
byte[] result = new byte;
for (int i = 0; i < input.length; i++) {
x = (x + 1) & 0xff;
y = ((key & 0xff) + y) & 0xff;
byte tmp = key;
key = key;
key = tmp;
xorIndex = ((key & 0xff) + (key & 0xff)) & 0xff;
result = (byte) (input ^ key);
}
return result;
}
}
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