java实现AES可逆加密算法

package com.hdu.encode;  import javax.crypto.Cipher;import javax.crypto.spec.IvParameterSpec;import javax.crypto.spec.SecretKeySpec; import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder; /** * AES 是一种可逆加密算法，对用户的敏感信息加密处理 对原始数据进行AES加密后，在进行Base64编码转化； */public class AESOperator { /* * 加密用的Key 可以用26个字母和数字组成 此处使用AES-128-CBC加密模式，key需要为16位。 */// a0b891c2d563e4f7 private String sKey = "abcdef0123456789"; private String ivParameter = "0123456789abcdef"; private static AESOperator instance = null;  private AESOperator() {  }  public static AESOperator getInstance() { if (instance == null)  instance = new AESOperator(); return instance; }  // 加密 public String encrypt(String sSrc){ String result = ""; try {  Cipher cipher;  cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");  byte[] raw = sKey.getBytes();  SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");  IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());// 使用CBC模式，需要一个向量iv，可增加加密算法的强度  cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);  byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));  result = new BASE64Encoder().encode(encrypted); } catch (Exception e) {  e.printStackTrace(); }  // 此处使用BASE64做转码。 return result;   }  // 解密 public String decrypt(String sSrc){ try {  byte[] raw = sKey.getBytes("ASCII");  SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");  Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");  IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());  cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);  byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);// 先用base64解密  byte[] original = cipher.doFinal(encrypted1);  String originalString = new String(original, "utf-8");  return originalString; } catch (Exception ex) {  ex.printStackTrace();  return null; } } public static void main(String[] args){ // 需要加密的字串 String cSrc = "测试"; System.out.println(cSrc + " 长度为" + cSrc.length()); // 加密 long lStart = System.currentTimeMillis(); String enString = AESOperator.getInstance().encrypt(cSrc); System.out.println("加密后的字串是：" + enString + "长度为" + enString.length());  long lUseTime = System.currentTimeMillis() - lStart; System.out.println("加密耗时：" + lUseTime + "毫秒"); // 解密 lStart = System.currentTimeMillis(); String DeString = AESOperator.getInstance().decrypt(enString); System.out.println("解密后的字串是：" + DeString); lUseTime = System.currentTimeMillis() - lStart; System.out.println("解密耗时：" + lUseTime + "毫秒"); }}