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- RC4属于对称可逆加密(就是加密解密的密钥一样)
+ C' t. |! A; W2 a5 b - 使用方法:4 F" E! {4 s2 I; `0 W7 m! H
- try
8 j. }. L) q" E+ a R7 j - {: j5 _$ t6 n& B: {
- String encryStr = RC4Util.encryRC4String("测试", "123456", "UTF-8");. A' K- ]4 p- y8 H3 k
- System.out.println("加密后得到得字符串:" + encryStr);& m( i: J: F4 [( R) q
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- catch (UnsupportedEncodingException e)( m8 R$ S! h& O2 } S- m/ b2 ]
- {}
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- String decryStr = RC4Util.decryRC4(encryStr, "123456");9 U7 P! {6 M: s: }
- System.out.println("解密后得到得字符串:"+decryStr);3 \/ R5 c, \. @% i/ ~
-
0 h% S" M6 _6 A- v/ h6 ?) a - 工具类:2 H' ~; }& d. ^% h" c
- class RC4Util {& s/ d2 T+ @" t0 p( P; `# T
- public static String encryRC4String(String data, String key, String chartSet) throws UnsupportedEncodingException {
( M9 u& d1 g. N/ Q) X - if (data == null || key == null) {
q$ j5 s9 q- @) T( y% w* s - return null;3 k; @& f% R7 e! i
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- return toHexString(asString(encryRC4Byte(data, key, chartSet)));4 q, [# |8 @0 H. K/ K5 E# d
- }
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4 p+ L. h8 A+ @7 y7 u3 ]. ^8 a! m- public static byte[] encryRC4Byte(String data, String key, String chartSet) throws UnsupportedEncodingException {0 p6 m+ g1 F: M2 j$ y, X) s; B+ S) T
- if (data == null || key == null) {
( M7 ~7 s/ Q9 G4 ^. t0 L/ x - return null;- B6 X2 F% c4 J- G1 e- N* [/ n
- }6 a+ A0 P5 m+ d( J6 ]. B1 }
- if (chartSet == null || chartSet.isEmpty()) {
5 s \" a# M- V1 r& _, b - byte bData[] = data.getBytes();* h- c. c) G# z4 B" G S
- return RC4Base(bData, key);% h. ^ t7 q4 O- C/ |9 R; x
- } else {
! Q3 b4 P* `* A/ N4 r8 e9 V - byte bData[] = data.getBytes(chartSet);- M2 O4 h3 [& ~8 M
- return RC4Base(bData, key);( z$ v3 p- e+ ~+ ?8 J
- }
' N% M) u0 V1 |' w2 j - 0 }) X! }% w7 Q+ ]) a' `3 Z" h! j
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( q" }/ {6 E6 J! H- public static String decryRC4(String data, String key) {
6 k# R7 Q- v" d: L7 H - if (data == null || key == null) {0 v7 k; ~: _: Z) |, m
- return null;
" f/ g0 ?" w( a2 Z% Y7 `; B - }
9 X3 x: j# U- U% v* H( Q - return new String(RC4Base(HexString2Bytes(data), key), StandardCharsets.UTF_8);
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- public static String decryRC4(byte[] data, String key) {
+ \0 L6 \/ P# {* A. r - if (data == null || key == null) {
; B& n$ E8 G5 D - return null;6 `. B k9 I a
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- return asString(RC4Base(data, key));. S4 q5 b+ Y1 C( O9 |
- }
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- private static String asString(byte[] buf) {/ o1 t2 |# A7 E7 ~3 l
- StringBuffer strbuf = new StringBuffer(buf.length);
* E4 S5 B+ E) f! r - for (byte b : buf) {6 q6 ?8 f; C4 h9 b7 q
- strbuf.append((char) b);9 O% [: Z; S3 t7 C( O1 J
- }1 ~. L! [1 p5 @- x
- return strbuf.toString();
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- private static byte[] initKey(String aKey) {
* x8 p# c. ^& J# e/ ? - byte[] bkey = aKey.getBytes();7 _8 a# c4 d4 w4 |- a. Z1 Y
- byte state[] = new byte[256];4 d2 d' ^& N/ j1 J ?
+ t% X5 Y, R( `6 X& v' y5 K' p9 [- for (int i = 0; i < 256; i++) {
. ]& ?. l: ~6 Q5 D - state[i] = (byte) i;, W; G& o& i7 A1 C8 R. }
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- int index1 = 0;+ [6 W- Q1 |* X4 U( M
- int index2 = 0;
0 P, x9 x8 h5 ` - if (bkey.length == 0) {7 l9 U1 e( p6 [% }3 U( f
- return null;6 Y+ g9 O8 N8 B- n t
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- for (int i = 0; i < 256; i++) {
4 y k+ H0 l1 q" ?& F( p8 j% w - index2 = ((bkey[index1] & 0xff) + (state[i] & 0xff) + index2) & 0xff;
' y* d) @3 e' r0 J - byte tmp = state[i];. _3 n" E, J' z+ g! i9 b
- state[i] = state[index2];6 S% m9 @+ `( I$ |& ^* q7 z) r
- state[index2] = tmp;
2 l/ I& E2 v0 {4 I3 v0 z3 `* w - index1 = (index1 + 1) % bkey.length;3 j6 Q* w7 ~2 {1 N+ G! L! q
- }
0 J2 `5 n# ]% u1 a1 `5 [ - return state;
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$ b% {1 |# L# ^0 I& x# a; [- private static String toHexString(String s) {
7 y8 j! j# z* B7 J& E a, a0 J - String str = "";
) g7 h! `% I8 U3 G% y& A: x" Q% o - for (int i = 0; i < s.length(); i++) {
. x& v) S$ P' {$ r! _- ^! e - int ch = (int) s.charAt(i);" e* ]8 B5 I2 }+ R+ }* N8 ]6 Y
- String s4 = Integer.toHexString(ch & 0xFF);& t8 ~- V( z$ h) T% u, ]8 Q
- if (s4.length() == 1) {. g0 G9 P# f9 M! x0 r
- s4 = '0' + s4;
" I$ ]$ e; P3 P" x; Q - }
( F( g7 H/ Y- ~3 k: |" Y) }& S2 H - str = str + s4;! F* t- i- J& }* d. Q% N0 g
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- return str;
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' H$ `; Y( v( |( b- private static byte[] HexString2Bytes(String src) {# Z$ g& J) ]4 n
- int size = src.length();( B+ x$ t) U* X O+ Y! Y
- byte[] ret = new byte[size / 2];$ k+ u% c& h% H$ a) u- ~
- byte[] tmp = src.getBytes(StandardCharsets.UTF_8);
% x6 f2 R. M# X# @3 y8 A6 Q" ~ - for (int i = 0; i < size / 2; i++) {9 t* [7 k& E( c7 [
- ret[i] = uniteBytes(tmp[i * 2], tmp[i * 2 + 1]);
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- return ret;; x4 G" E+ D/ Y# k6 ^
- }
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8 K% b3 Z- b e! p- private static byte uniteBytes(byte src0, byte src1) {
# G3 e t4 I5 D1 E" Y9 j - char _b0 = (char) Byte.decode("0x" + new String(new byte[]{src0})).byteValue();
- A' k( g% E/ w* ^) s% Q( ]1 E, ] - _b0 = (char) (_b0 << 4);
0 O' n' `" L8 Q' K! h% u - char _b1 = (char) Byte.decode("0x" + new String(new byte[]{src1})).byteValue();
8 R1 n: t% t% e6 s' j8 i U - return (byte) (_b0 ^ _b1);0 ^: u F+ H& x) \1 G) a
- }
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- private static byte[] RC4Base(byte[] input, String mKkey) {
& k/ X9 _3 H+ y" u! ~% ^ - int x = 0;
- A* i/ f$ m: {) [ - int y = 0;
7 _: v, b1 U8 G- ]2 }4 t8 e$ Q' w - byte key[] = initKey(mKkey);2 [1 O& h, n/ x4 M
- int xorIndex;6 i; a) Q* [4 l! e+ `& C
- byte[] result = new byte[input.length];
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- for (int i = 0; i < input.length; i++) {
, `( e* E# `; n, w$ n. O7 C* r - x = (x + 1) & 0xff;
3 k3 y7 j1 d: N - y = ((key[x] & 0xff) + y) & 0xff;
5 W- }, I& z" g7 B$ w$ v* W - byte tmp = key[x];$ |8 N/ V& T+ {% G- C
- key[x] = key[y];$ }) g* I: T( ^1 W1 V) q; [$ [
- key[y] = tmp;
- E, H- u4 E" h/ l# [; ^1 V$ W8 a - xorIndex = ((key[x] & 0xff) + (key[y] & 0xff)) & 0xff;# |2 w* j: j, a$ C0 s, K. k- V6 K4 U2 w
- result[i] = (byte) (input[i] ^ key[xorIndex]);' O8 G5 V0 Z" S; R! |" f' g
- }. Y3 z; N: a# ?. \ U2 R! f% U4 K
- return result;
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