Java MD5 Sum md5Sum(String msg)

Description

md Sum

License

Apache License

Declaration

public static String md5Sum(String msg) throws NoSuchAlgorithmException 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.io.InputStream;
import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Main {
    private static final String pseudo[] = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D",
            "E", "F" };

    public static String md5Sum(String msg) throws NoSuchAlgorithmException {
        MessageDigest md = MessageDigest.getInstance("MD5");
        md.update(msg.getBytes(), 0, msg.length());
        return new String(byteArrayToHexString(md.digest()));
    }/*from  w  w w .  ja va 2  s  . c o m*/

    public static String md5Sum(InputStream iStr) throws IOException, NoSuchAlgorithmException {
        MessageDigest md = MessageDigest.getInstance("MD5");
        byte[] buf = new byte[64 * 1024];
        int count = iStr.read(buf);
        while (count > 0) {
            md.update(buf, 0, count);
            count = iStr.read(buf);
        }
        iStr.close();
        return new String(byteArrayToHexString(md.digest()));
    }

    /**
     * This code copied from DevX.com - posted by Jeff Boyle
     * Convert a byte[] array to readable string format. This makes the "hex" readable!
     * @return result String buffer in String format 
     * @param in byte[] buffer to convert to string format
     */
    static String byteArrayToHexString(byte in[]) {
        byte ch = 0x00;
        int i = 0;

        if (in == null || in.length <= 0)
            return null;

        StringBuffer out = new StringBuffer(in.length * 2);
        while (i < in.length) {
            ch = (byte) (in[i] & 0xF0); // Strip off high nibble
            ch = (byte) (ch >>> 4); // shift the bits down
            ch = (byte) (ch & 0x0F); // must do this is high order bit is on!
            out.append(pseudo[(int) ch]); // convert the nibble to a String Character
            ch = (byte) (in[i] & 0x0F); // Strip off low nibble 
            out.append(pseudo[(int) ch]); // convert the nibble to a String Character
            i++;
        }
        String rslt = new String(out);
        return rslt;
    }
}

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