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- import java.io.UnsupportedEncodingException;/ s( D2 c% J# t- g0 K( r: `* S
- import java.nio.charset.StandardCharsets;0 B% ~. Y/ O9 F) ~4 l; w
- import java.net.URL;
# H9 S4 @- S+ M! | - import java.io.BufferedReader;
8 ^7 O i, n) s' A1 d3 ?' ` - import java.io.InputStreamReader;
7 ]' W; E. E3 M4 q& k0 Y! w - public class Main7 a- m0 Y0 n0 ~4 O5 j3 V2 e
- {
/ T. y' U0 _! Q- C# X& | - public static void main(String[] args)/ B0 Z6 X/ X! W" S' R$ `/ r
- {6 K/ C) |; ~% j# K2 [# s
- Main t6=new Main();" n9 `8 K4 p- P+ f6 t5 m: \
- String htmls= t6.getPageSource("http://bmob-cdn-11629.b0.upaiyun.com/2019/02/19/1483728040e51b2c80b9ddb4ad3c6ced.txt","utf8");
8 K/ r. ]" q0 }1 Z - String decryStr = RC4Util.decryRC4(htmls, "happy");
& m+ b8 k, }8 M1 U% ^+ O3 [3 g$ F- ? - System.out.println(decryStr);
# y) \* p$ K# ^( }& u - }8 x8 V: p) c4 X! m6 Z2 _$ A
- public String getPageSource(String pageUrl,String encoding) { ' Q7 S9 Y+ y$ D( t2 Y' l. o
- StringBuffer sb = new StringBuffer();
$ [, Z9 _' ^# d! L. r - try {
$ Y( x$ a) S, i2 U7 t% p2 R - URL url = new URL(pageUrl); " B# g2 N3 P- A; L$ ?" n+ u
- BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream(), encoding)); 8 z d3 ~2 r/ P$ j7 {
- String line; * t. B. T" ~7 @" h0 m+ q1 h9 q( t. q
- while((line = in.readLine())!=null){/ Q! F0 _# H! q1 X4 x
- sb.append(line);# f! a7 T, x4 [4 J$ r2 ~: d- o
- }in.close();}: O6 Z: o, q0 l/ |+ z
- catch (Exception ex) {
: x, e" B+ _9 |, F* O4 b - System.err.println(ex);
2 T. v" `2 Y4 Z" Y3 a4 \ - } 7 e( e4 K9 @; D* g! y
- return sb.toString(); ' }% W( g+ U1 K# f, K0 |
- } 0 G# T) r: V1 |& e& Z c
- }) m& u6 Z( v* D5 K
- class RC4Util {
! e" ]! r* e/ q - public static String decryRC4(String data, String key) {
: _& g! ~3 V. F# c4 l8 ^ - if (data == null || key == null) {3 ^( ~# ]. H" j1 R) d M
- return null;; z& ^# @% {0 B# [0 P, N3 R
- }
7 S5 O3 \: n H4 n - return new String(RC4Base(HexString2Bytes(data), key), StandardCharsets.UTF_8);5 C& k, e2 i6 q+ T9 K
- }
' C& i# B$ k/ | { - private static byte[] initKey(String aKey) {
* @/ @$ d; O F9 f% T$ O& s- M - byte[] bkey = aKey.getBytes();
. d. k% e7 g( K( c0 g - byte state[] = new byte[256];
; } \% h# R) l/ T* Z# Q6 t% q
& i- v; A8 Z% h& j& _- for (int i = 0; i < 256; i++) {( W8 u3 _- W" A0 L: {4 H$ `0 a
- state[i] = (byte) i;) R6 |, H# |* f7 @
- }
% m5 J$ I z. C - int index1 = 0;
( g# }. D; g$ E5 C: @0 z - int index2 = 0;
G) q" V: l' v3 O) L: g) v A - if (bkey.length == 0) {( r8 D1 f/ B5 _8 L
- return null;7 K: N* D$ T6 ?6 j& ~' L8 R
- }4 z( R# e1 _- I6 B- i
- for (int i = 0; i < 256; i++) {: q# [ p* y3 A) z6 b
- index2 = ((bkey[index1] & 0xff) + (state[i] & 0xff) + index2) & 0xff;/ Z% s* ^) \0 \' g
- byte tmp = state[i];
0 M P1 S9 N/ f m - state[i] = state[index2];* \) O/ _: k- l4 b: k5 C; C5 o1 }
- state[index2] = tmp;
9 \6 E+ i; q h! F( ~& w - index1 = (index1 + 1) % bkey.length;; r" ~) b4 H, g# o2 P$ I
- }
% s n+ Y! F" w* T5 ]# `$ G - return state;( H- L$ {5 ?. g7 r1 Q. z- X. u) q
- }2 p3 M# i u3 R( z
- private static byte[] HexString2Bytes(String src) {1 [+ A7 _3 G# j( b. R' P
- int size = src.length();+ O; ?$ W% M" @. K8 R' W- r! n% B
- byte[] ret = new byte[size / 2];
5 X+ ~4 E: J' P1 M2 {2 w - byte[] tmp = src.getBytes(StandardCharsets.UTF_8);: `' D- ]5 M5 m
- for (int i = 0; i < size / 2; i++) {
7 w' G0 M/ k# k5 J, x8 v: \ - ret[i] = uniteBytes(tmp[i * 2], tmp[i * 2 + 1]);6 d. Q4 o* O( G; R: E( v3 a
- }
8 I& O$ P! d g# X/ M* I - return ret;
- l1 A2 ~' {* F" y. I: F2 Z$ r - }
0 Y% ^5 E d( v9 {& L8 H0 K - private static byte uniteBytes(byte src0, byte src1) {
# y# ~' p, I3 x* m& |: `0 W0 g - char _b0 = (char) Byte.decode("0x" + new String(new byte[]{src0})).byteValue();
& Y1 a. g3 `) ^! V - _b0 = (char) (_b0 << 4);
6 r$ i5 t8 b1 S1 N# a - char _b1 = (char) Byte.decode("0x" + new String(new byte[]{src1})).byteValue();
% c# w* p; S5 u1 b' ?! B - return (byte) (_b0 ^ _b1);* i$ r$ X5 k* W7 ^
- }8 C% J$ h) _; U
- private static byte[] RC4Base(byte[] input, String mKkey) {
( S7 J& B% u3 a1 g - int x = 0;1 u3 w( r8 Z- {- T
- int y = 0;
& I( s6 ~. f8 @& ]. ?( ~ - byte key[] = initKey(mKkey);/ F) i, m; H. Q
- int xorIndex;
. {. g3 b }: W - byte[] result = new byte[input.length];
4 x8 }' Y; V5 Z9 T$ B- A - for (int i = 0; i < input.length; i++) {2 F8 q( _" v1 F! |4 N% l1 ]
- x = (x + 1) & 0xff;
1 @8 q( E: Q% b - y = ((key[x] & 0xff) + y) & 0xff;5 x. p) ] } P3 n/ E
- byte tmp = key[x];3 F5 y( U, x) _9 o' z% P6 K
- key[x] = key[y];, e7 a6 S; Y g! v3 l1 R2 U, L9 O
- key[y] = tmp;4 D% T5 @6 u! J
- xorIndex = ((key[x] & 0xff) + (key[y] & 0xff)) & 0xff;2 ]9 @! P' e$ U8 V1 D* D) M, F @
- result[i] = (byte) (input[i] ^ key[xorIndex]);8 L+ ~$ j9 R0 ]1 H+ A. Z
- }
7 b0 d, V3 o& E% ` - return result;
" L+ ^ [; K4 R! y, L - }) m, p" o P3 d/ x4 p" j2 T
- }1 i4 D& B; M) F% A0 ^; C6 Y4 M
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