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/*******************************************************************************
* 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 java.security.MessageDigest;
/*******************************************************************************
* 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
*******************************************************************************/
import java.security.NoSuchAlgorithmException;
/**
* This class provides utility method for one-way hashing of strings
*
*/
public class DigestUtil {
private static final char[] HEX_CHARS = "0123456789abcdef".toCharArray();
private static final String MD5 = "MD5";
private static final String SHA1 = "SHA1";
/**
* Create a one-way hash of an input strings. First a MD5 hash of the input string
* is calculated and appended to the string, and then the new string is hashed with SHA1
*
* @param originalText the string to be hashed
* @return hashed string
* @throws Exception
*/
public static String encrypt(String originalText)throws Exception{
try {
String password_salt = appendSalt(originalText);
byte[] sha_digest;
sha_digest = getDigest(password_salt.getBytes(), SHA1);
return asHex(sha_digest);
} catch (NoSuchAlgorithmException e) {
throw new Exception ("Encryption Failed!");
}
}
private static String appendSalt(String inputPassword) throws NoSuchAlgorithmException{
byte [] salt = getDigest(inputPassword.getBytes(), MD5);
return inputPassword + asHex(salt);
}
//byte array into hexademical string
private static String asHex(byte[] buf)
{
char[] chars = new char[2 * buf.length];
for (int i = 0; i < buf.length; ++i)
{
chars[2 * i] = HEX_CHARS[(buf[i] & 0xF0) >>> 4];
chars[2 * i + 1] = HEX_CHARS[buf[i] & 0x0F];
}
return new String(chars);
}
//generate digest byte[]
private static byte[] getDigest(byte[] inputData, String algorithm) throws NoSuchAlgorithmException {
MessageDigest md = MessageDigest.getInstance(algorithm);
md.update(inputData);
return md.digest();
}
}
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