DigestUtilTests.java

/*******************************************************************************
 * Copyright (c) 2011 SAP AG
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     Lazar Kirchev, SAP AG - initial API and implementation
 *******************************************************************************/

package org.eclipse.equinox.console.storage;

import static org.junit.Assert.*;
import java.security.MessageDigest;

import org.junit.Test;


public class DigestUtilTests {
	
	private static final char[] HEX_CHARS = "0123456789abcdef".toCharArray();
	private static final String MD5 = "MD5";
	private static final String SHA1 = "SHA1";
	private static final String TEXT = "sometext";
	
	@Test
	public void testEncrypt() throws Exception {
		MessageDigest md = MessageDigest.getInstance(MD5);
    	md.update(TEXT.getBytes());
    	byte[] digest = md.digest();
    	
    	char[] chars = new char[2 * digest.length];
        for (int i = 0; i < digest.length; ++i)
        {
            chars[2 * i] = HEX_CHARS[(digest[i] & 0xF0) >>> 4];
            chars[2 * i + 1] = HEX_CHARS[digest[i] & 0x0F];
        }
        
    	String modifiedText = TEXT + new String(chars);
    	md = MessageDigest.getInstance(SHA1);
    	md.update(modifiedText.getBytes());
    	digest = md.digest();
    	
    	chars = new char[2 * digest.length];
        for (int i = 0; i < digest.length; ++i)
        {
            chars[2 * i] = HEX_CHARS[(digest[i] & 0xF0) >>> 4];
            chars[2 * i + 1] = HEX_CHARS[digest[i] & 0x0F];
        }
        
        String expectedEncryptedText = new String(chars);
        
        assertEquals("Encrypted text not as expected", expectedEncryptedText, DigestUtil.encrypt(TEXT));
	}
}