package com.farriver.bwf.common.utilities;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;

public class EncryptUtil {
    private final Logger logger = LoggerFactory.getLogger(EncryptUtil.class);

    public static String md5Encrypt(final String content) {

        MessageDigest md5 = null;
        try {
            md5 = MessageDigest.getInstance("MD5");
        } catch (NoSuchAlgorithmException e) {
            
        }

        BigInteger digest = new BigInteger(md5.digest(content.getBytes()));
        //32位
        return digest.toString(16);
    }

    public static byte[] base64Encrypt(final String content) {
        return Base64.getEncoder().encode(content.getBytes());
    }

    public static byte[] base64Decrypt(final byte[] encoderContent) {
        return Base64.getDecoder().decode(encoderContent);
    }

    public static String SHAEncrypt(final String content) {
        try {
            MessageDigest sha = MessageDigest.getInstance("SHA");
            byte[] sha_byte = sha.digest(content.getBytes());
            StringBuffer hexValue = new StringBuffer();
            for (byte b : sha_byte) {
                //将其中的每个字节转成十六进制字符串：byte类型的数据最高位是符号位，通过和0xff进行与操作，转换为int类型的正整数。
                String toHexString = Integer.toHexString(b & 0xff);
                hexValue.append(toHexString.length() == 1 ? "0" + toHexString : toHexString);
            }
            return hexValue.toString();
        } catch (Exception e) {
            
        }
        return "";
    }

    public static byte[] HMACEncrypt(final String key, final String content) {
        try {
            SecretKey secretKey = new SecretKeySpec(key.getBytes(), "MAC");
            Mac mac = Mac.getInstance(secretKey.getAlgorithm());

            mac.init(secretKey);
            return mac.doFinal(content.getBytes());
        } catch (Exception e) {
            
        }
        return null;
    }
}