Java MD5 String md5(String text)

Description

md

License

Open Source License

Declaration

public static String md5(String text) throws Exception 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.security.*;

public class Main {
    public static String md5(String text) throws Exception {
        return md5(text.getBytes("UTF-8"));
    }//  w w  w.  j  a v  a 2 s .  c om

    public static String md5(byte[] source) throws Exception {
        int bufferSize = 4096;
        byte[] buffer = new byte[4096];

        MessageDigest md5 = MessageDigest.getInstance("MD5");

        int remain = source.length;

        while (remain > 0) {
            int len = (remain > bufferSize) ? bufferSize : remain;
            System.arraycopy(source, source.length - remain, buffer, 0, len);
            remain = remain - len;

            md5.update(buffer, 0, len);
        }

        return byte2Hex(md5.digest());
    }

    public static String byte2Hex(byte[] bytes) throws Exception {
        final String HEX = "0123456789abcdef";

        String result = "";
        for (int i = 0; i < bytes.length; i++) {
            result += HEX.charAt(bytes[i] >> 4 & 0x0F);
            result += HEX.charAt(bytes[i] & 0x0F);
        }

        return new String(result);
    }
}

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