package com.vci.client.logon.base;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESedeKeySpec;
import javax.crypto.spec.IvParameterSpec;

import sun.misc.BASE64Decoder;

public class EncryptData {

	byte[] encryptKey;
	DESedeKeySpec spec;
	SecretKeyFactory keyFactory;
	SecretKey theKey;
	Cipher cipher;
	IvParameterSpec IvParameters;

	/**
	 * 
	 * @param encKey 双方协定的共享密钥字符串,如："www.liming.portal.com"
	 */
	public EncryptData(String encKey) {
		try {
			this.encryptKey = encKey.getBytes();
			this.spec = new DESedeKeySpec(this.encryptKey);
			this.keyFactory = SecretKeyFactory.getInstance("DESede");
			this.theKey = this.keyFactory.generateSecret(this.spec);
			this.cipher = Cipher.getInstance("DESede/CBC/PKCS5Padding");
			this.IvParameters = new IvParameterSpec(new byte[] { 12, 34, 56,
					78, 90, 87, 65, 43 });
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

    //
	/**
	 * 
	 * @param sPwd,需解密的加密字符串，由UID和时间戳构成
	 * @return
	 */
	public String decrypt(String sPwd) {
		String decrypted_password = null;
		try {
			byte[] password = new BASE64Decoder().decodeBuffer(sPwd);
			this.cipher.init(2, this.theKey, this.IvParameters);
			byte[] decryptedPassword = password;
			byte[] decrypted_pwd = this.cipher.doFinal(decryptedPassword);
			decrypted_password = new String(decrypted_pwd);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return decrypted_password;
	}
}