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- import java.io.UnsupportedEncodingException;
; \) o, U+ h! d- l" P% O6 c0 r - import java.nio.charset.StandardCharsets;+ X, h( y) y/ l2 J9 @. g
- import java.net.URL;& L" U I2 o, ?& x9 P# b
- import java.io.BufferedReader;) y; Y/ P4 E0 |
- import java.io.InputStreamReader;
* v9 x, Q( ?$ _7 A9 E - public class Main+ M- j" Y% T- J8 Q8 t2 Z
- {
' z4 w0 C _% Z. Q( u - public static void main(String[] args)
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- Main t6=new Main();$ @- I8 L' T4 F, z2 R! s' q' Y& S
- String htmls= t6.getPageSource("http://bmob-cdn-11629.b0.upaiyun.com/2019/02/19/1483728040e51b2c80b9ddb4ad3c6ced.txt","utf8"); % |0 L: P, }4 w2 |# R: h5 c! F
- String decryStr = RC4Util.decryRC4(htmls, "happy");# Z3 Y) X& ]7 X
- System.out.println(decryStr);
3 C8 X, w7 C9 Z* P7 P( F6 t - }
4 A3 Q- R T7 i! ^, m - public String getPageSource(String pageUrl,String encoding) { , }/ U- X! L& [
- StringBuffer sb = new StringBuffer();
! O( _7 @ d2 `( B. J - try {
7 @) h; r+ H8 O5 H) k6 W - URL url = new URL(pageUrl); # O6 i$ S4 f: s, s3 e# o8 e
- BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream(), encoding));
) F0 B1 _; a1 z# F& G9 | - String line;
8 \' u6 E# |' b% K8 g - while((line = in.readLine())!=null){
+ {! R% ~; X$ x, e9 a - sb.append(line);4 Q5 P' X; N% d5 u2 |. K- V
- }in.close();}
! w- J2 V" H0 ^' @* Z - catch (Exception ex) {
. ^. K5 m H; {. Y1 b- c - System.err.println(ex); ) p8 `. T4 I- d9 m; V4 G
- } 4 P; [9 L8 t' G* |
- return sb.toString();
9 a1 F) G3 k) f& p$ e - }
8 `% f) i) ?3 Y. ^ - }
9 w* ]7 [" D/ Q" {4 @ - class RC4Util {
% y& U. @. L+ i! h( O; }# ? - public static String decryRC4(String data, String key) {
9 Q; J# Y9 q% w% C8 M+ d T - if (data == null || key == null) {
, f; ?+ U u( d - return null;
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- return new String(RC4Base(HexString2Bytes(data), key), StandardCharsets.UTF_8);
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- private static byte[] initKey(String aKey) {" k7 y& ?0 H4 A0 O
- byte[] bkey = aKey.getBytes();% ?# o# X# L8 d
- byte state[] = new byte[256];* H. U( ?( d+ `/ |3 C. A' @
4 ]3 R g* T$ P+ |: M! q. W0 o! L- for (int i = 0; i < 256; i++) {# f5 _% r3 I; l% }/ g
- state[i] = (byte) i;& H* i0 o0 V; k+ W# `
- }
0 }3 d' @6 t5 d: P$ p- j - int index1 = 0;; a, P8 T- c' X0 ]5 C2 v; |. w
- int index2 = 0;
! K# q+ `3 s" t" T, |$ ]" Y; i - if (bkey.length == 0) {
8 x: u* A T, E) G- w - return null; q( s* `4 |+ D5 w" L& A- x6 b
- }/ X! p1 [3 t4 l* ~+ W* r2 Q
- for (int i = 0; i < 256; i++) {
- Z" ~( h |6 E8 I( n - index2 = ((bkey[index1] & 0xff) + (state[i] & 0xff) + index2) & 0xff;
7 q7 Z4 y# p! P" Z, O: {: l8 ^5 ~ - byte tmp = state[i];6 b* S5 V% c+ B) i" q+ |* K! v
- state[i] = state[index2];) ^0 z, o5 c6 d% O8 q
- state[index2] = tmp;
9 s$ M4 n* ?1 i - index1 = (index1 + 1) % bkey.length;! u4 b# ~1 U8 j' @4 d# E
- }- Y2 V' c9 D) g' F" t; b2 E" T4 z, M [
- return state;
4 z _3 |: q2 y" u2 S0 Z) l$ ~8 \) ^ - }
2 w2 t, `8 J4 t; y5 w - private static byte[] HexString2Bytes(String src) {: L. S1 U' \8 [, |7 J
- int size = src.length();& V5 |! C3 v, l0 w+ q0 r
- byte[] ret = new byte[size / 2];
% {8 H+ H7 V; g& q - byte[] tmp = src.getBytes(StandardCharsets.UTF_8);
; T( F0 v) Y/ v+ x; E - for (int i = 0; i < size / 2; i++) {7 x9 Q3 g7 |3 t( [+ o+ |8 i( p
- ret[i] = uniteBytes(tmp[i * 2], tmp[i * 2 + 1]);
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- return ret;( W* j- }( S! Q1 P; s' S% k' S
- }
2 v0 l) x% V/ v( W6 X8 a - private static byte uniteBytes(byte src0, byte src1) {
. Y2 H4 s& Y1 \( t. B/ a- N - char _b0 = (char) Byte.decode("0x" + new String(new byte[]{src0})).byteValue();
0 {7 Y+ A" Y9 Q) i" _: [ - _b0 = (char) (_b0 << 4);
- ~9 ~% O) a; ^. P3 d - char _b1 = (char) Byte.decode("0x" + new String(new byte[]{src1})).byteValue();' N" e; J' P% R7 T+ v
- return (byte) (_b0 ^ _b1);
P8 p: U) h4 C7 Q' n, r - }
- J( |! M3 D. w" E/ g - private static byte[] RC4Base(byte[] input, String mKkey) {
# k3 ^" Y6 u% d! V( F - int x = 0;
( Q6 S# a2 g! z - int y = 0; m. @ @& E% ?7 J
- byte key[] = initKey(mKkey);
5 ]' i9 m7 t0 h. x" Y - int xorIndex;7 q7 z/ W8 H' F: e# w. n' e5 d. T5 g
- byte[] result = new byte[input.length];
3 x D1 U% H$ q/ w - for (int i = 0; i < input.length; i++) {
3 f. P- g' c& |" ~* R6 N - x = (x + 1) & 0xff;
+ ]% ~( c7 |- s- A; c - y = ((key[x] & 0xff) + y) & 0xff;
& s! g8 |. ~: }" d D8 b - byte tmp = key[x];
% ]8 N2 S. b7 N; S% }1 n: t3 x - key[x] = key[y];$ t, y$ b8 {) }+ `5 G6 K
- key[y] = tmp;& U' a1 k( b; }, _0 A- w0 |
- xorIndex = ((key[x] & 0xff) + (key[y] & 0xff)) & 0xff;$ ~4 J7 ^) @" s- J) ~6 m
- result[i] = (byte) (input[i] ^ key[xorIndex]);
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- return result;3 Q% g E# _1 ?! d1 @
- }! \/ { S, b! Q* y) c9 h
- }
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