package com.erry.iclear.dateInterface.util;

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

/**
 * @author Administrator
 */
public class SHA256Util {

    /**
     * 用java原生的摘要实现SHA256加密
     * @param str 加密前的报文
     * @return
     */
    public static String getSHA256String(String str) {
        String encodeStr = "";
        try {
            MessageDigest 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();
            throw new RuntimeException("SHA256签名过程中出现错误");
        }
        return encodeStr;
    }

    /**
     * byte[]转为16进制
     *
     * @param bytes
     * @return
     */
    private static String byte2Hex(byte[] bytes) {
        StringBuffer stringBuffer = new StringBuffer();
        for (int i = 0; i < bytes.length; i++) {
            String temp = Integer.toHexString(bytes[i] & 0xFF);
            if (temp.length() == 1) {
                stringBuffer.append("0");
            }
            stringBuffer.append(temp);
        }
        return stringBuffer.toString();
    }

    public static void main(String[] args){
        String secretKey = "IDEiClearExport89b358b0cc07788c1654745105866";
        String token = getSHA256String(secretKey);
        System.out.println(token);
    }
}