org.jpedal.io.security.JCADecryption Maven / Gradle / Ivy
/*
* ===========================================
* Java Pdf Extraction Decoding Access Library
* ===========================================
*
* Project Info: http://www.idrsolutions.com
* Help section for developers at http://www.idrsolutions.com/support/
*
* (C) Copyright 1997-2017 IDRsolutions and Contributors.
*
* This file is part of JPedal/JPDF2HTML5
*
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* ---------------
* JCADecryption.java
* ---------------
*/
package org.jpedal.io.security;
import java.security.Key;
import java.security.cert.Certificate;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.jpedal.exception.PdfSecurityException;
import org.jpedal.gui.ShowGUIMessage;
public class JCADecryption implements BaseDecryption {
public JCADecryption() {
allowBiggerKeySize();
}
@Override
public byte[] v5Decrypt(final byte[] rawValue, final byte[] encKey) throws PdfSecurityException {
final byte[] returnKey;
try {
final SecretKeySpec key = new SecretKeySpec(encKey, "AES");
final Cipher c = Cipher.getInstance("AES/CBC/NOPADDING");
c.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(new byte[16]));
returnKey = c.doFinal(rawValue);
} catch (final Exception e) {
throw new PdfSecurityException("Exception " + e.getMessage() + " with v5 encoding");
}
return returnKey;
}
@Override
public byte[] decodeAES(final byte[] encKey, final byte[] encData, final byte[] ivData) throws Exception {
byte[] out = null;
try {
final SecretKeySpec key = new SecretKeySpec(encKey, "AES");
final Cipher c = Cipher.getInstance("AES/CBC/PKCS5Padding");
c.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(ivData));
out = c.doFinal(encData);
} catch (final Exception e) {
e.printStackTrace();
}
return out;
}
private void allowBiggerKeySize() {
// try {
// final Field field = Class.forName("javax.crypto.JceSecurity").getDeclaredField("isRestricted");
// field.setAccessible(true);
// field.set(null, java.lang.Boolean.FALSE);
// } catch (Exception ex) {
// ex.printStackTrace();
// }
}
@Override
public byte[] readCertificate(final byte[][] recipients, final Certificate certificate, final Key key) {
final String message = "This method is not supported without the BouncyCastle mail jar added "
+ "to the classpath. " + System.getProperty("line.separator") +
"See https://www.idrsolutions.com/jpedal/support/additional-jars/ for more details.";
ShowGUIMessage.showGUIMessage(message, "Unsupported Certificate operation");
throw new UnsupportedOperationException(message);
}
}