msgdigest.java

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/*
    $Author: $
    $Date: $
    $Revision: $
    $NoKeywords: $
*/
package jp.co.ntl.codec;

import java.security.*;
import java.io.UnsupportedEncodingException;

public class MsgDigest
{
    public static byte[] getDigest(String data) {
        return getDigest(data, "MD5");
    }

    public static byte[] getDigest(String data, String algorithm) {
        byte[] bytes;
        try {
            bytes = data.getBytes("ISO-8859-1");
        } catch(UnsupportedEncodingException e) {
           return null;
        }
        return getDigest(bytes, algorithm);
    }

    public static byte[] getDigest(byte[] bytes, String algorithm) {
        byte[] md_bytes;
		try {
            MessageDigest md = MessageDigest.getInstance(algorithm);
            md.update(bytes);
            md_bytes = md.digest();
        } catch (NoSuchAlgorithmException e) {
            md_bytes = null;
        }

        return md_bytes;
    }

    public static boolean compareDigest(byte[] bytes1, byte[] bytes2) {
        boolean ret = compareDigest(bytes1, bytes2, "MD5");
        return ret;
    }

    public static boolean compareDigest(String str, byte[] bytes2) {
        byte[] bytes1;
        try {
            bytes1 = str.getBytes("ISO-8859-1");
        } catch(UnsupportedEncodingException e) {
           return false;
        }

        return compareDigest(bytes1, bytes2, "MD5");
    }

    public static boolean compareDigest(byte[] bytes1, byte[] bytes2, String algorithm) {
		return MessageDigest.isEqual( bytes1, bytes2 );
    }
}