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/* |
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* Copyright 2014-2021, Armenak Grigoryan, and individual contributors as indicated |
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* by the @authors tag. See the copyright.txt in the distribution for a |
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* full listing of individual contributors. |
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* |
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* This is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU Lesser General Public License as |
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* published by the Free Software Foundation; either version 2.1 of |
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* the License, or (at your option) any later version. |
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* |
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* This software is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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*/ |
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package com.strider.datadefender.utils; |
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import java.io.UnsupportedEncodingException; |
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import java.security.InvalidKeyException; |
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import java.security.MessageDigest; |
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import java.security.NoSuchAlgorithmException; |
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import java.util.Arrays; |
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import java.util.Base64; |
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import javax.crypto.BadPaddingException; |
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import javax.crypto.Cipher; |
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import javax.crypto.IllegalBlockSizeException; |
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import javax.crypto.NoSuchPaddingException; |
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import javax.crypto.spec.SecretKeySpec; |
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import lombok.extern.log4j.Log4j2; |
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/** |
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* This class implements determenistic data anonymization |
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* by encoding the data using "salt" and decoding it. |
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* |
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* @author Armenak Grigoryan |
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*/ |
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@Log4j2 |
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public final class Encoder { |
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private static SecretKeySpec secretKey; |
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private static byte[] key; |
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/** |
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* Empty constructor |
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*/ |
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public Encoder() { |
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} |
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public static void setKey(String myKey) { |
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MessageDigest sha = null; |
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try { |
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key = myKey.getBytes("UTF-8"); |
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sha = MessageDigest.getInstance("SHA-1"); |
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key = sha.digest(key); |
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key = Arrays.copyOf(key, 16); |
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secretKey = new SecretKeySpec(key, "AES"); |
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} |
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catch (NoSuchAlgorithmException | UnsupportedEncodingException e) { |
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log.debug(e); |
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} |
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} |
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public String encrypt(String strToEncrypt, String secret) { |
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try { |
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setKey(secret); |
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Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding"); |
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cipher.init(Cipher.ENCRYPT_MODE, secretKey); |
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return Base64.getEncoder().encodeToString(cipher.doFinal(strToEncrypt.getBytes("UTF-8"))); |
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} catch (UnsupportedEncodingException | InvalidKeyException | NoSuchAlgorithmException | |
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BadPaddingException | IllegalBlockSizeException | NoSuchPaddingException e) { |
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log.error("Error while encrypting: " + e.toString()); |
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} |
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return null; |
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} |
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public String decrypt(String strToDecrypt, String secret) { |
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try { |
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setKey(secret); |
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Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING"); |
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cipher.init(Cipher.DECRYPT_MODE, secretKey); |
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return new String(cipher.doFinal(Base64.getDecoder().decode(strToDecrypt))); |
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} catch (InvalidKeyException | NoSuchAlgorithmException | BadPaddingException | |
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IllegalBlockSizeException | NoSuchPaddingException e) { |
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log.error("Error while decrypting: " + e.toString()); |
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} |
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return null; |
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} |
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} |
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|
armenak /
DataDefender
