get md5 string for byte array, string, and file - Android java.security

Android examples for java.security:MD5

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Description

get md5 string for byte array, string, and file

Demo Code

import android.app.Application;
import android.support.annotation.NonNull;
import android.text.TextUtils;
import android.util.Base64;
import java.io.File;
import java.io.FileInputStream;
import java.io.UnsupportedEncodingException;
import java.math.BigInteger;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.security.InvalidParameterException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.NavigableMap;
import java.util.TreeMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main{

    /**/*from   w w  w .j a va 2 s  .c om*/
     * get md5 string according to source data
     * @param data the source data
     * @return the md5 string
     */
    public static String toMd5(byte[] data) {
        String result;
        try {
            MessageDigest algorithm = MessageDigest.getInstance("MD5");
            algorithm.reset();
            algorithm.update(data);
            result = toHexString(algorithm.digest());
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        }
        return result;
    }
    /**
     * get md5 string according to source
     * @param str the source string
     * @return the md5 string
     */
    public static String toMd5(String str) {
        String result = "";
        try {
            MessageDigest algorithm = MessageDigest.getInstance("MD5");
            algorithm.reset();
            algorithm.update(str.getBytes("utf-8"));
            result = toHexString(algorithm.digest());
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return result;
    }
    /**
     * get file md5
     */
    public static String toMD5(File file) {
        if (!file.isFile()) {
            return null;
        }
        MessageDigest digest = null;
        FileInputStream in = null;
        byte buffer[] = new byte[1024];
        int len;
        try {
            digest = MessageDigest.getInstance("MD5");
            in = new FileInputStream(file);
            while ((len = in.read(buffer, 0, 1024)) != -1) {
                digest.update(buffer, 0, len);
            }
            in.close();
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
        BigInteger bigInt = new BigInteger(1, digest.digest());
        return bigInt.toString(16);
    }

}

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