package com.example.demo.Util;


import javax.crypto.Cipher;
import java.security.*;

import static org.apache.poi.poifs.crypt.CipherAlgorithm.des;


public class BaseDES {
	private static String strDefaultKey = "98hltleg";

	private Cipher encryptCipher = null;

	private Cipher decryptCipher = null;

	public static String byteArr2HexStr(byte[] arrB) throws Exception {
		int iLen = arrB.length;

		StringBuffer sb = new StringBuffer(iLen * 2);
		for (int i = 0; i < iLen; i++) {
			int intTmp = arrB[i];

			while (intTmp < 0) {
				intTmp = intTmp + 256;
			}

			if (intTmp < 16) {
				sb.append("0");
			}
			sb.append(Integer.toString(intTmp, 16));
		}
		return sb.toString();
	}

	public static byte[] hexStr2ByteArr(String strIn) {
		byte[] arrB = strIn.getBytes();
		int iLen = arrB.length;

		byte[] arrOut = new byte[iLen / 2];
		for (int i = 0; i < iLen; i = i + 2) {
			String strTmp = new String(arrB, i, 2);
			arrOut[i / 2] = (byte) Integer.parseInt(strTmp, 16);
		}
		return arrOut;
	}

	public BaseDES() throws Exception {
		this(strDefaultKey);
	}

	public BaseDES(String strKey) throws Exception {

		Key key = getKey(strKey.getBytes());

		encryptCipher = Cipher.getInstance("DES");
		encryptCipher.init(Cipher.ENCRYPT_MODE, key);

		decryptCipher = Cipher.getInstance("DES");
		decryptCipher.init(Cipher.DECRYPT_MODE, key);
	}

	public byte[] encrypt(byte[] arrB) throws Exception {
		return encryptCipher.doFinal(arrB);
	}

	public String encrypt(String strIn) throws Exception {
		return byteArr2HexStr(encrypt(strIn.getBytes()));
	}

	public byte[] decrypt(byte[] arrB) throws Exception {
		return decryptCipher.doFinal(arrB);
	}

	public String decrypt(String strIn) throws Exception {
		return new String(decrypt(hexStr2ByteArr(strIn)));
	}

	private Key getKey(byte[] arrBTmp) {

		byte[] arrB = new byte[8];

		for (int i = 0; i < arrBTmp.length && i < arrB.length; i++) {
			arrB[i] = arrBTmp[i];
		}

		Key key = new javax.crypto.spec.SecretKeySpec(arrB, "DES");

		return key;
	}


	public static void main(String args[]) {
		try {
			BaseDES d = new BaseDES();
			String encryptedText = d.encrypt("94615273");
			System.out.println("加密结果：" + encryptedText);
			System.out.println("加密字符串：90005179》"+d.encrypt("90005179"));
			System.out.println("解密字符串：6aaef5277c050f7ae383f816651098ff》"+d.decrypt("6aaef5277c050f7ae383f816651098ff"));
			} catch (Exception e) {
			e.printStackTrace();
		}
	}
}