ViontechAESUtil.java

package com.viontech.domain;

import java.security.Key;
import java.security.SecureRandom;
import java.util.Base64;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
public class ViontechAESUtil {
    //实例化密钥
    private static Key key;

    //原始密钥
    private static String KEY_STR = "273D470C41CD8C3F766C94E245228C910DB1CB75";

    //编码
    private static String CHARSETNAME = "UTF-8";

    //密钥算法
    private static String KEY_ALGORITHM = "AES";

    //加密-解密算法 / 工作模式 / 填充方式
    private static String CIPHER_ALGORITHM = "AES/ECB/PKCS5Padding";

    /**
     * 初始化key
     */
    static {
        try {
            KeyGenerator kgen = KeyGenerator.getInstance(KEY_ALGORITHM);
            SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
            random.setSeed(KEY_STR.getBytes());
            kgen.init(128, random);
            key = kgen.generateKey();
            kgen = null;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * @description: AES对称加密字符串，并通过Jdk自带Base64转换为ASCII
     * @author: Administrator
     * @date: 2017年11月7日 上午9:37:48
     * @param str
     * @return
     */
    public static String getEncryptString(String str) {
        try {
            byte[] bytes = str.getBytes(CHARSETNAME);
            Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
            cipher.init(Cipher.ENCRYPT_MODE, key);
            byte[] doFinal = cipher.doFinal(bytes);
            return Base64.getEncoder().encodeToString(doFinal);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * @description: 对AES加密字符串进行解密
     * @author: maojialong
     * @date: 2017年11月7日 上午10:14:00
     * @param str
     * @return
     */
    public static String getDecryptString(String str) {
        try {
            byte[] bytes = Base64.getDecoder().decode(str);
            Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
            cipher.init(Cipher.DECRYPT_MODE, key);
            byte[] doFinal = cipher.doFinal(bytes);
            return new String(doFinal, CHARSETNAME);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public static void main(String[] rgs){
        System.out.println(ViontechAESUtil.getEncryptString("postgres"));
        System.out.println(ViontechAESUtil.getDecryptString("C1kjGLXX23wckTPm6hmU5Q=="));
    }
}