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;    }    /**     * @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));    }}