package com.saye.hrs.commons.encrypt;

import org.apache.commons.codec.binary.Base64;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class EncryptUtil {

	// AES ecb模式解密  key:秘钥 initVector:偏移量  encrypted：加密内容
    public static String decrypt(String key,String initVector,String encrypted) {
    	try {
    		IvParameterSpec iv = new IvParameterSpec(initVector.getBytes("UTF-8"));
    		SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes("UTF-8"), "AES");
    		
    		Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
    		cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
    		byte[] original = cipher.doFinal(Base64.decodeBase64(encrypted));
     
    		return new String(original);
    	} catch (Exception ex) {
    		ex.printStackTrace();
    	}
    	return null;
    }
 
    public static void main(String[] args) throws Exception {
    	System.out.println(decrypt("a6xdabhysfescfbu","encryptionIntVec","oYzamqnnyJ8GG6646PDYBQ=="));
    }
    
    public static String getSHA256Str(String str){
   	 MessageDigest messageDigest;
   	 String encodeStr = "";
   	 try {
   	  messageDigest = MessageDigest.getInstance("SHA-256");
   	  messageDigest.update(str.getBytes("UTF-8"));
   	  encodeStr = byte2Hex(messageDigest.digest());
   	 } catch (NoSuchAlgorithmException e) {
   	  e.printStackTrace();
   	 } catch (UnsupportedEncodingException e) {
   	  e.printStackTrace();
   	 }
   	 return encodeStr;
   	}
   	/**
   	* 将byte转为16进制
   	* @param bytes
   	* @return
   	*/
   	private static String byte2Hex(byte[] bytes){
   	 StringBuffer stringBuffer = new StringBuffer();
   	 String temp = null;
   	 for (int i=0;i<bytes.length;i++){
   	  temp = Integer.toHexString(bytes[i] & 0xFF);
   	  if (temp.length()==1){
   	  //1得到一位的进行补0操作
   	  stringBuffer.append("0");
   	  }
   	  stringBuffer.append(temp);
   	 }
   	 return stringBuffer.toString();
   	}
}