java RC4加密解密，javarc4加密解密, package

java RC4加密解密，javarc4加密解密, package

    package com.*;      public class RC4 {          public static String decry_RC4(byte[] data, String key) {              if (data == null || key == null) {                  return null;              }              return asString(RC4Base(data, key));          }          public static String decry_RC4(String data, String key) {              if (data == null || key == null) {                  return null;              }              return new String(RC4Base(HexString2Bytes(data), key));          }          public static byte[] encry_RC4_byte(String data, String key) {              if (data == null || key == null) {                  return null;              }              byte b_data[] = data.getBytes();              return RC4Base(b_data, key);          }          public static String encry_RC4_string(String data, String key) {              if (data == null || key == null) {                  return null;              }              return toHexString(asString(encry_RC4_byte(data, key)));          }          private static String asString(byte[] buf) {              StringBuffer strbuf = new StringBuffer(buf.length);              for (int i = 0; i < buf.length; i++) {                  strbuf.append((char) buf[i]);              }              return strbuf.toString();          }          private static byte[] initKey(String aKey) {              byte[] b_key = aKey.getBytes();              byte state[] = new byte[256];              for (int i = 0; i < 256; i++) {                  state[i] = (byte) i;              }              int index1 = 0;              int index2 = 0;              if (b_key == null || b_key.length == 0) {                  return null;              }              for (int i = 0; i < 256; i++) {                  index2 = ((b_key[index1] &amp; 0xff) + (state[i] &amp; 0xff) + index2) &amp; 0xff;                  byte tmp = state[i];                  state[i] = state[index2];                  state[index2] = tmp;                  index1 = (index1 + 1) % b_key.length;              }              return state;          }          private static String toHexString(String s) {              String str = "";              for (int i = 0; i < s.length(); i++) {                  int ch = (int) s.charAt(i);                  String s4 = Integer.toHexString(ch &amp; 0xFF);                  if (s4.length() == 1) {                      s4 = '0' + s4;                  }                  str = str + s4;              }              return str;// 0x表示十六进制          }          private static byte[] HexString2Bytes(String src) {              int size = src.length();              byte[] ret = new byte[size / 2];              byte[] tmp = src.getBytes();              for (int i = 0; i < size / 2; i++) {                  ret[i] = uniteBytes(tmp[i * 2], tmp[i * 2 + 1]);              }              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();              byte ret = (byte) (_b0 ^ _b1);              return ret;          }          private static byte[] RC4Base(byte[] input, String mKkey) {              int x = 0;              int y = 0;              byte key[] = initKey(mKkey);              int xorIndex;              byte[] result = new byte[input.length];              for (int i = 0; i < input.length; i++) {                  x = (x + 1) &amp; 0xff;                  y = ((key[x] &amp; 0xff) + y) &amp; 0xff;                  byte tmp = key[x];                  key[x] = key[y];                  key[y] = tmp;                  xorIndex = ((key[x] &amp; 0xff) + (key[y] &amp; 0xff)) &amp; 0xff;                  result[i] = (byte) (input[i] ^ key[xorIndex]);              }              return result;          }          public static void main(String[] args) {              String inputStr = "做个好男人";              String str = encry_RC4_string(inputStr, "123456");              System.out.println(str);              System.out.println(decry_RC4(str, "123456"));          }      }