package com.bmcc.open.portal.auth.demo.test;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import com.bmcc.open.portal.auth.demo.util.AESUtil;

import Decoder.BASE64Decoder;
import Decoder.BASE64Encoder;



/**
 * AES 是一种可逆加密算法，对用户的敏感信息加密处理 对原始数据进行AES加密后，在进行Base64编码转化；
 */
public class EncryptionAndDecryption {

    /*
     * 加密用的Key 可以用26个字母和数字组成 此处使用AES-128-CBC加密模式，key需要为16位。
     */
    private String sKey = "9231547690624328";//key，可自行修改
    private String ivParameter = "0102030405060708";//偏移量,可自行修改
    private static EncryptionAndDecryption instance = null;

    private EncryptionAndDecryption() {

    }

    public static EncryptionAndDecryption getInstance() {
        if (instance == null)
            instance = new EncryptionAndDecryption();
        return instance;
    }

    public static String Encrypt(String encData ,String secretKey,String vector) throws Exception {

        if(secretKey == null) {
            return null;
        }
        if(secretKey.length() != 16) {
            return null;
        }
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        byte[] raw = secretKey.getBytes();
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        IvParameterSpec iv = new IvParameterSpec(vector.getBytes());// 使用CBC模式，需要一个向量iv，可增加加密算法的强度
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
        byte[] encrypted = cipher.doFinal(encData.getBytes("utf-8"));
        return new BASE64Encoder().encode(encrypted);// 此处使用BASE64做转码。
    }
    /**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();  
    } 

    // 加密
    public byte[] encrypt(String sSrc) throws Exception {
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        byte[] raw = sKey.getBytes();
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());// 使用CBC模式，需要一个向量iv，可增加加密算法的强度
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
        byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
        return encrypted;//new BASE64Encoder().encode(encrypted);// 此处使用BASE64做转码。
    }

    // 解密
    public String decrypt(byte sSrc[]) throws Exception {
        try {
            byte[] raw = sKey.getBytes("ASCII");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
            byte[] encrypted1 = sSrc;//new BASE64Decoder().decodeBuffer(sSrc);// 先用base64解密
            byte[] original = cipher.doFinal(encrypted1);
            String originalString = new String(original, "utf-8");
            return originalString;
        } catch (Exception ex) {
            return null;
        }
    }

    public String decrypt(String sSrc,String key,String ivs) throws Exception {
        try {
            byte[] raw = key.getBytes("ASCII");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            IvParameterSpec iv = new IvParameterSpec(ivs.getBytes());
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
            byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);// 先用base64解密
            byte[] original = cipher.doFinal(encrypted1);
            String originalString = new String(original, "utf-8");
            return originalString;
        } catch (Exception ex) {
            return null;
        }
    }
      /**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 String encodeBytes(byte[] bytes) {
        StringBuffer strBuf = new StringBuffer();

        for (int i = 0; i < bytes.length; i++) {
            strBuf.append((char) (((bytes[i] >> 4) & 0xF) + ((int) 'a')));
            strBuf.append((char) (((bytes[i]) & 0xF) + ((int) 'a')));
        }

        return strBuf.toString();
    }

    public static void main(String[] args) throws Exception {
        // 需要加密的字串
        String cSrc = "斯蒂芬地方";
        // 加密
        byte[] enString = EncryptionAndDecryption.getInstance().encrypt(cSrc);
        String encryptResultStr = parseByte2HexStr(enString);
        System.out.println("加密后：" + encryptResultStr);
        
        // 解密
        byte[] decryptFrom = AESUtil.parseHexStr2Byte("9A33BC1DD60233E4786CA1E682812B8D7AE2F7DF2A685A6C06C0A261FC180D1F4BF816937730B34CBB463B7DF4C5B71AE0AB7E5E27AFF6D3E031E8EAA7A3AFB9304EC367F7173314004C003E5AB3AA025A8CFBB7938DF29BE1BB988E95C532847C6D20B5EB3E6601EDB44C4FB3822F7DA0FD701FD00DC2D58D146F1E04A2D8E49B28D5BEFCA8B82D13F8019CD5414B18580497602783EBE75098038EF0031A5383C4F65F2696CD0706DAE91B4B6CC00A15741E709C547213539B3389644C5F0CC29F9F716BF649AEB554A36611BA1831"); 
        String DeString = EncryptionAndDecryption.getInstance().decrypt(decryptFrom);
        System.out.println("解密后的字串是：" + DeString);
    }

}