import java.security.MessageDigest;

import lombok.extern.slf4j.Slf4j;

/**

 * 签名帮助类

 *

 * @author yangzl

 * @data 2019年4月4日

 *

 */

@Slf4j

public class SignUtils {

    private SignUtils() {}

    /**

     * 生成32位的MD5签名串

     * @param source 待签名串

     * @param salt 盐

     * @param toUpperCase 是否转大写

     * @return

     */

    public static String md5(String source, String salt, boolean toUpperCase) {

        source = source + salt;

        StringBuilder sb = new StringBuilder(32);

        try {

            MessageDigest md = MessageDigest.getInstance("MD5");

            byte[] array = md.digest(source.getBytes("utf-8"));

            for (int i = 0; i < array.length; i++) {

                if(toUpperCase) {

                    sb.append(Integer.toHexString((array[i] & 0xFF) | 0x100).toUpperCase().substring(1, 3));

                } else {

                    sb.append(Integer.toHexString((array[i] & 0xFF) | 0x100).substring(1, 3));

                }

            }

        } catch (Exception e) {

            log.error("Can not encode the string '" + source + "' to MD5!", e);

            throw new RuntimeException(e);

        }

        return sb.toString();

    }

}