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package org.iartisan.runtime.utils;


import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * md5算法
 */
public class MD5Util {

    public static String MD5(String s) {
        return MD5(s.getBytes());
    }

    public static String MD5(byte[] btInput) {
        try {
            char hexDigits[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
            // 获得MD5摘要算法的 MessageDigest 对象
            MessageDigest mdInst = MessageDigest.getInstance("MD5");
            // 使用指定的字节更新摘要
            mdInst.update(btInput);
            // 获得密文
            byte[] md = mdInst.digest();
            // 把密文转换成十六进制的字符串形式
            int j = md.length;
            char result[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                result[k++] = hexDigits[byte0 >>> 4 & 0xf];
                result[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(result);
        } catch (NoSuchAlgorithmException e) {
            return "NoSuchAlgorithmException";
        }
    }

}




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