AES 密码加密保存

今天做了一个用AES进行密码加密的功能(不需要jar包 jdk自带)

详细步骤如下：

 1.先用main方法测试一下，能否将密码加密

package com.demo.util;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;


public class MyAES {
    public static byte[] encrypt(String content, String password) {
        try {
            KeyGenerator kgen = KeyGenerator.getInstance("AES");
            kgen.init(128, new SecureRandom(password.getBytes()));
            SecretKey secretKey = kgen.generateKey();
            byte[] enCodeFormat = secretKey.getEncoded();
            SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
            Cipher cipher = Cipher.getInstance("AES");// 创建密码器
            byte[] byteContent = content.getBytes("utf-8");
            cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
            byte[] result = cipher.doFinal(byteContent);
            return result; // 加密
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**解密
     * @param content  待解密内容
     * @param password 解密密钥
     * @return
     */
    public static byte[] decrypt(byte[] content, String password) {
        try {
            KeyGenerator kgen = KeyGenerator.getInstance("AES");
            kgen.init(128, new SecureRandom(password.getBytes()));
            SecretKey secretKey = kgen.generateKey();
            byte[] enCodeFormat = secretKey.getEncoded();
            SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
            Cipher cipher = Cipher.getInstance("AES");// 创建密码器
            cipher.init(Cipher.DECRYPT_MODE, key);// 初始化
            byte[] result = cipher.doFinal(content);
            return result; // 加密
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**将二进制转换成16进制
     * @param buf
     * @return
     */
    public static String parseByte2HexStr(byte buf[]) {
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < buf.length; i++) {
            String hex = Integer.toHexString(buf[i] & 0xFF);
            if (hex.length() == 1) {
                hex = '0' + hex;
            }
            sb.append(hex.toUpperCase());
        }
        return sb.toString();
    }

    /**将16进制转换为二进制
     * @param hexStr
     * @return
     */
    public static byte[] parseHexStr2Byte(String hexStr) {
        if (hexStr.length() < 1)
            return null;
        byte[] result = new byte[hexStr.length()/2];
        for (int i = 0;i< hexStr.length()/2; i++) {
            int high = Integer.parseInt(hexStr.substring(i*2, i*2+1), 16);
            int low = Integer.parseInt(hexStr.substring(i*2+1, i*2+2), 16);
            result[i] = (byte) (high * 16 + low);
        }
        return result;
    }
    public static void main(String[] args){
        String content = "123";
        String password = "1234567890123";
        //加密
        System.out.println("加密前：" + content);
        byte[] encryptResult = encrypt(content, password);
        String encryptResultStr = parseByte2HexStr(encryptResult);
        System.out.println("加密后：" + encryptResultStr);
        //解密
        byte[] decryptFrom = parseHexStr2Byte(encryptResultStr);
        byte[] decryptResult = decrypt(decryptFrom,password);
        System.out.println("解密后：" + new String(decryptResult));
    }
}

2.创建一个配置文件(system.properties),这是一个密钥，可以自己定义

key=henglin2016

3.获取密钥：

package com.demo.util;
import java.util.Iterator;
import java.util.ResourceBundle;
public class SystemKey {
    private static ResourceBundle bundle;
    static {
        bundle = ResourceBundle.getBundle("system");
        if (bundle == null) {
            throw new IllegalArgumentException("system.properties is not found!");
        }
    }
    public static String getStr(String key){
        if(bundle!=null){
            return bundle.getString(key);
        }else{
            return null;
        }
    }

    public static void main(String[] args) {
        if(bundle != null) {
            Iterator it = bundle.keySet().iterator() ;
            while (it.hasNext()) {
                System.out.println(it.next());
            }
        }
    }
}

4.需要的都已准备好，现在只需在你需要的地方引用就可以

（1）这是登录的时候密码加密 和注册的时候密码加密，是一样的。

  String AESkey=SystemKey.getStr("key");
        //加密
        byte[] encryptResult = MyAES.encrypt(pw, AESkey);
        pw = MyAES.parseByte2HexStr(encryptResult);

在数据库中密码就被加密了，如下：