54 lines
1.7 KiB
Java
54 lines
1.7 KiB
Java
/*
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Copyright 2019-2020 Dmitry Isaenko
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This file is part of Konogonka.
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Konogonka is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Konogonka 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Konogonka. If not, see <https://www.gnu.org/licenses/>.
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*/
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package libKonogonka.ctraes;
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import org.bouncycastle.jce.provider.BouncyCastleProvider;
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import javax.crypto.Cipher;
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import javax.crypto.spec.IvParameterSpec;
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import javax.crypto.spec.SecretKeySpec;
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import java.security.Security;
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public class AesCtr {
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private static boolean BCinitialized = false;
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private void initBCProvider(){
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Security.addProvider(new BouncyCastleProvider());
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BCinitialized = true;
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}
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private Cipher cipher;
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private SecretKeySpec key;
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public AesCtr(byte[] keyArray) throws Exception{
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if ( ! BCinitialized)
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initBCProvider();
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key = new SecretKeySpec(keyArray, "AES");
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cipher = Cipher.getInstance("AES/CTR/NoPadding", "BC");
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}
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public byte[] decrypt(byte[] encryptedData, byte[] IVarray) throws Exception{
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IvParameterSpec iv = new IvParameterSpec(IVarray);
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cipher.init(Cipher.DECRYPT_MODE, key, iv);
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return cipher.doFinal(encryptedData);
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}
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}
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