import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.io.File;
import java.io.InputStreamReader;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.nio.charset.Charset;

import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Base64;
import java.util.Scanner;
import java.util.Arrays;

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;

//import sun.misc.BASE64Decoder;
//import sun.misc.BASE64Encoder;
//import RC4;

public class AES {
    public static String bytesToHexString(byte[] src) {
        StringBuilder stringBuilder = new StringBuilder("");
        if (src == null || src.length <= 0) {
            return null;
        }
        for (int i = 0; i < src.length; i++) {
            int v = src[i] & 0xFF;
            String hv = Integer.toHexString(v);
            if (hv.length() < 2) {
                stringBuilder.append(0);
            }
            stringBuilder.append(hv);
        }
        return stringBuilder.toString();
    }

    public static byte[] hexStringToBytes(String hexString) {
        if (hexString == null || hexString.equals("")) {
            return null;
        }
        hexString = hexString.toUpperCase();
        int length = hexString.length() / 2;
        char[] hexChars = hexString.toCharArray();
        byte[] d = new byte[length];
        for (int i = 0; i < length; i++) {
            int pos = i * 2;
            d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
        }
        return d;
    }

    private static byte charToByte(char c) {
        return (byte) "0123456789ABCDEF".indexOf(c);
    }

    public static String AES_Encode(String encodeRules, String content) {
        try {
            // 1.构造密钥生成器，指定为AES算法,不区分大小写
            KeyGenerator keygen = KeyGenerator.getInstance("AES");
            // 2.根据ecnodeRules规则初始化密钥生成器
            // 生成一个128位的随机源,根据传入的字节数组
            // keygen.init(128, new SecureRandom(encodeRules.getBytes()));
            SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
            secureRandom.setSeed(encodeRules.getBytes());
            keygen.init(128, secureRandom);
            // 3.产生原始对称密钥
            SecretKey original_key = keygen.generateKey();
            // 4.获得原始对称密钥的字节数组
            byte[] raw = original_key.getEncoded();
            // 5.根据字节数组生成AES密钥
            SecretKey key = new SecretKeySpec(raw, "AES");
            // 6.根据指定算法AES自成密码器
            Cipher cipher = Cipher.getInstance("AES");
            // 7.初始化密码器，第一个参数为加密(Encrypt_mode)或者解密解密(Decrypt_mode)操作，第二个参数为使用的KEY
            cipher.init(Cipher.ENCRYPT_MODE, key);
            // 8.获取加密内容的字节数组(这里要设置为utf-8)不然内容中如果有中文和英文混合中文就会解密为乱码
            byte[] byte_encode = content.getBytes("utf-8");
            // 9.根据密码器的初始化方式--加密：将数据加密
            byte[] byte_AES = cipher.doFinal(byte_encode);
            // 10.将加密后的数据转换为字符串
            // 这里用Base64Encoder中会找不到包
            // 解决办法：
            // 在项目的Build path中先移除JRE System Library，再添加库JRE System Library，重新编译后就一切正常了。

            // String AES_encode=new String(new BASE64Encoder().encode(byte_AES));
            String AES_encode = new String(bytesToHexString(byte_AES));
            // 11.将字符串返回
            return AES_encode;
        } 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();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        // 如果有错就返加nulll
        return null;
    }

    /*
     * 解密
     * 解密过程：
     * 1.同加密1-4步
     * 2.将加密后的字符串反纺成byte[]数组
     * 3.将加密内容解密
     */
    public static String AES_Decode(String encodeRules, String content) {
        String ss;
        try {
            // 1.构造密钥生成器，指定为AES算法,不区分大小写
            KeyGenerator keygen = KeyGenerator.getInstance("AES");
            // 2.根据ecnodeRules规则初始化密钥生成器
            // 生成一个128位的随机源,根据传入的字节数组
            // keygen.init(128, new SecureRandom(encodeRules.getBytes()));
            SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
            secureRandom.setSeed(encodeRules.getBytes());
            keygen.init(128, secureRandom);
            // 3.产生原始对称密钥
            SecretKey original_key = keygen.generateKey();
            // 4.获得原始对称密钥的字节数组
            byte[] raw = original_key.getEncoded();
            // 5.根据字节数组生成AES密钥
            SecretKey key = new SecretKeySpec(raw, "AES");
            // 6.根据指定算法AES自成密码器
            Cipher cipher = Cipher.getInstance("AES");
            // 7.初始化密码器，第一个参数为加密(Encrypt_mode)或者解密(Decrypt_mode)操作，第二个参数为使用的KEY
            cipher.init(Cipher.DECRYPT_MODE, key);
            // 8.将加密并编码后的内容解码成字节数组
            byte[] byte_content = hexStringToBytes(content);
            // byte [] byte_content= new BASE64Decoder().decodeBuffer(content);
            // System.out.println("ttttttttttttttttttttttttttt");
            // System.out.println(new String(byte_content, "UTF-8"));
            /*
             * 解密
             */
            byte[] byte_decode = cipher.doFinal(byte_content);
            String AES_decode = new String(byte_decode, "utf-8");
            return AES_decode;
        } catch (NoSuchAlgorithmException e) {
            ss = "NoSuchAlgorithmException";
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            ss = "NoSuchPaddingException";
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            ss = "InvalidKeyException";
            e.printStackTrace();
        } catch (IOException e) {
            ss = "IOException";
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            ss = "IllegalBlockSizeException";
            e.printStackTrace();
        } catch (BadPaddingException e) {
            ss = "BadPaddingException";
            e.printStackTrace();
        }

        // 如果有错就返加nulll
        return ss;
    }

    public static void main(String[] args) {
        // MyClass se=new MyClass();
        // Scanner scanner=new Scanner(System.in);
        /*
         * 加密
         */
        System.out.println("使用AES对称加密，请输入加密的规则");
        // String encodeRules=scanner.next();
        System.out.println("请输入要加密的内容:");
        String encodeRules = "a02254eb247146dfa446c4b2795ebf90";
        String content = "32770";
        String outstr = AES_Encode(encodeRules, content);
        System.out.println("根据输入的规则" + encodeRules + "加密后的密文是:" + outstr);

        /*
         * 解密
         */
        System.out.println("使用AES对称解密，请输入加密的规则：(须与加密相同)");

        String byte_str = "0212f41b372fe457c3f7df0757151615";
        outstr = AES_Decode(encodeRules, byte_str);
        System.out.println("根据输入的规则" + encodeRules + "解密后的明文是:" + outstr);

    }

}