Java MD5 String MD5(String text)

Description

MD

License

Open Source License

Declaration

public static String MD5(String text) throws NoSuchAlgorithmException, UnsupportedEncodingException 

Method Source Code

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

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Main {
    public static String MD5(String text) throws NoSuchAlgorithmException, UnsupportedEncodingException {
        return messageDigest(text, "MD5");
    }//from   w  w  w.  j  a  v  a 2  s . co  m

    public static String messageDigest(String text, String algorithm)
            throws NoSuchAlgorithmException, UnsupportedEncodingException {
        MessageDigest md = MessageDigest.getInstance(algorithm);
        // md.update(text.getBytes("iso-8859-1"), 0, text.length());
        md.update(text.getBytes("UTF-8"), 0, text.length());
        //        // SHA-512 --> 64 bytes / 128 hex numbers.
        //        byte[] sha1hash = new byte[64];
        //        sha1hash = md.digest();
        byte[] sha1hash = md.digest();
        return convertToHex(sha1hash);
    }

    private static String convertToHex(byte[] data) {
        StringBuffer buf = new StringBuffer();
        for (int i = 0; i < data.length; i++) {
            int halfbyte = (data[i] >>> 4) & 0x0F;
            int two_halfs = 0;
            do {
                if ((0 <= halfbyte) && (halfbyte <= 9)) {
                    buf.append((char) ('0' + halfbyte));
                } else {
                    buf.append((char) ('a' + (halfbyte - 10)));
                }
                halfbyte = data[i] & 0x0F;
            } while (two_halfs++ < 1);
        }
        return buf.toString();
    }
}

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