java实现的RC4加密解密算法示例

public static String HloveyRC4(String aInput,String aKey)
{
    int[] iS = new int[256];
    byte[] iK = new byte[256];
    for (int i=0;i<256;i++)
      iS[i]=i;
    int j = 1;
    for (short i= 0;i<256;i++)
    {
      iK[i]=(byte)aKey.charAt((i % aKey.length()));
    }
    j=0;
    for (int i=0;i<255;i++)
    {
      j=(j+iS[i]+iK[i]) % 256;
      int temp = iS[i];
      iS[i]=iS[j];
      iS[j]=temp;
    }
    int i=0;
    j=0;
    char[] iInputChar = aInput.toCharArray();
    char[] iOutputChar = new char[iInputChar.length];
    for(short x = 0;x<iInputChar.length;x++)
    {
      i = (i+1) % 256;
      j = (j+iS[i]) % 256;
      int temp = iS[i];
      iS[i]=iS[j];
      iS[j]=temp;
      int t = (iS[i]+(iS[j] % 256)) % 256;
      int iY = iS[t];
      char iCY = (char)iY;
      iOutputChar[x] =(char)( iInputChar[x] ^ iCY) ;
    }
    return new String(iOutputChar);
}

public static void main(String[] args) {
  String inputStr = "做个好男人";
  String key = "abcdefg";
  String str = HloveyRC4(inputStr,key);
  //打印加密后的字符串
  System.out.println(str);
  //打印解密后的字符串
  System.out.println(HloveyRC4(str,key));
}