一个使用位运算实现的简单的字符串对称加密工具 public class StringCrypto { public static void main(String[] args) { String test = "hello hello"; String key = "hellohello"; String code = crypto(test, key); String recode = deCrypto(code, key); System.out.println(code); System.out.println(recode); } public static String crypto(String resource, String key){ byte[] bs = resource.getBytes(Consts.UTF_8); byte[] kbs = key.getBytes(Consts.UTF_8); StringBuilder builder = new StringBuilder("1"); for (int i = 0; i <bs.length; i++) { int temp = bs[i]+kbs[i%kbs.length]+256; builder.append(String.format("%3d",Math.abs(temp)).replace(\' \',\'0\')); } BigInteger bigInteger = new BigInteger(builder.toString(),10); return bigInteger.toString(36); } public static String deCrypto(String code, String key){ byte[] kbs = key.getBytes(Consts.UTF_8); BigInteger bigInteger = new BigInteger(code, 36); String source = bigInteger.toString(10); int len = source.length()/3; byte[] bs = new byte[len]; for (int i = 0; i < bs.length; i++) { int temp = Integer.parseInt(source.substring(3*i+1, 3*(i+1)+1)); bs[i] = (byte)(temp - kbs[i%kbs.length]-256); } return new String(bs,Consts.UTF_8); } }