AES加密解密

package com.ujia.util.security;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class AESUtil {
    /**
     *配置文件中保存的 AES的key，必须是16位
     */
    public final static String KEY = "^{Y1*-/?(i1Lo0|)";
    
    /**
     * 配置文件中保存的AES的IV，必须是16位
     */
    public final static String IV = "{!y9+.*5Ty0S&%$]";

    /**
     * 使用AES加密
     * @param data 需要加密的明文
     * @return     加密后的密文
     */
    public static String encrypt(String data) {
           try {
                Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
                 int blockSize = cipher. getBlockSize();
                 byte[] dataBytes = data.getBytes();
                 int plaintextLength = dataBytes. length;
                 if (plaintextLength % blockSize != 0) {
                      plaintextLength = plaintextLength
                                  + (blockSize - (plaintextLength % blockSize));
                }
                 byte[] plaintext = new byte[plaintextLength];
                System. arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);
                SecretKeySpec keyspec = new SecretKeySpec(KEY.getBytes(), "AES" );
                IvParameterSpec ivspec = new IvParameterSpec(IV.getBytes());
                cipher.init(Cipher. ENCRYPT_MODE, keyspec, ivspec);
                 byte[] encrypted = cipher.doFinal(plaintext);
                 return new sun.misc.BASE64Encoder().encode(encrypted);
          } catch (Exception e) {
                e.printStackTrace();
                 return null;
          }
    }

    /**
     * AES解密
     * @param data 需要解密的字符串
     * @return     返回解密后的数据     
     * @throws Exception
     */
    public static String desEncrypt(String data) throws Exception{
        byte[] encrypted1 = new sun.misc.BASE64Decoder().decodeBuffer(data);
        Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
        SecretKeySpec keyspec = new SecretKeySpec(KEY.getBytes(), "AES");
        IvParameterSpec ivspec = new IvParameterSpec(IV.getBytes());
        cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);
        byte[] original = cipher.doFinal(encrypted1);
        String originalString = new String(original);
        return originalString;

    }
}

 MD5加密

package com.ujia.util.security;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import sun.misc.BASE64Encoder;


public class MD5Util {

    public static String MD5_String(String password) throws NoSuchAlgorithmException{
        MessageDigest md5 = MessageDigest.getInstance("MD5");
        BASE64Encoder base64 = new BASE64Encoder();
        return base64.encode(md5.digest(password.getBytes()));
    }
}