AES加密解密源码

package com.yy.date;

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 AES
{
    /**
     * 加密
     * 
     * @param content 需要加密的内容
     * @param password  加密密码
     * @return
     */
    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***
     * @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;
    }

    /**
     * @param args
     */
    public static void main(String[] args)
    {
        String content = "test";
        String password = "12345678";
        // 加密
        System.out.println("加密前：" + content);
        System.out.println("秘钥是"+password);
        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));
    }

}