package com.jjt.nccloud.utils;

import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

public class SHA256Util {
    public static void main(String[] args) throws Exception {
        String client_id = "xfxt";
        String client_secret = "e85b3ca8e7c840fab912";
        String pubKey = "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtnA9R1DTbqpTpfpSsBe/cVIp0P+59p8x5bzzPzylAKwF6txAqeTCnVP2LtRquHVlu6W0A77V2LuUJWovDluBiz+jmnPmQolXbhbBJscGBlAfeuaeRw38GtYy7VIc7zetZKcJ+TUPRLB/4Ic/RAAgUte0/N0nYsehAncsBPSQLh30GHNtMHtLvrJaVxtH+e0G5gezUYLp0EqL6ieQCgyoWbt4u9obeTbaX9ppj8oqG63+ZaOXQG1qInC+Q49ALQsfAT6EbxMg0yIdgwl/4wWf/Aj5yxLxLrsPqBwAGM7FVnXfYbPYsQ7k+nndbfEBOr2eLWncIr7f85zDPLB8THurfwIDAQAB";
        String secret_entryption = Encryption.pubEncrypt(pubKey, client_secret);
        System.err.println("secret_entryption：：" + secret_entryption);
        System.err.println(URLEncoder.encode(secret_entryption, "utf-8"));

        String sign = SHA256Util.getSHA256(client_id + client_secret + pubKey, pubKey);
        System.err.println(sign);
    }

    public static String getSHA256(String str, String key) {
        //加盐
        byte[] salt = new byte[16];
        try {
            SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
            random.setSeed(key.getBytes());
            random.nextBytes(salt);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        String salt_string = Base64Util.encryptBASE64(salt);
//        System.out.println("salt_String::" + salt_string);
        return getSHA256(str + salt_string.replaceAll("\r|\n", ""));
    }

    private static String getSHA256(String str) {
        MessageDigest messageDigest;
        String encodestr = "";
        try {
            messageDigest = MessageDigest.getInstance("SHA-256");
            messageDigest.update(str.getBytes(StandardCharsets.UTF_8));
            encodestr = byte2Hex(messageDigest.digest());
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        }
        return encodestr;
    }

    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寰楀埌涓?綅鐨勮繘琛岃ˉ0鎿嶄綔
                stringBuffer.append("0");
            }
            stringBuffer.append(temp);
        }
        return stringBuffer.toString();
    }

}
