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/*
* Copyright (c) 2015 Cisco Systems, Inc. and others. 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
*/
package org.opendaylight.aaa.authn.mdsal.store;
import java.security.spec.KeySpec;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
import javax.xml.bind.DatatypeConverter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* @author - Sharon Aicler (saichler@cisco.com)
**/
public class DataEncrypter {
final protected SecretKey k;
private static final Logger LOG = LoggerFactory.getLogger(DataEncrypter.class);
private static final byte[] iv = { 0, 5, 0, 0, 7, 81, 0, 3, 0, 0, 0, 0, 0, 43, 0, 1 };
private static final IvParameterSpec ivspec = new IvParameterSpec(iv);
public static final String ENCRYPTED_TAG = "Encrypted:";
public DataEncrypter(final String ckey) {
SecretKey tmp = null;
if (ckey != null && !ckey.isEmpty()) {
try {
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
KeySpec spec = new PBEKeySpec(ckey.toCharArray(), iv, 32768, 128);
tmp = keyFactory.generateSecret(spec);
} catch (Exception e) {
LOG.error("Couldn't initialize key factory", e);
}
if (tmp != null) {
k = new SecretKeySpec(tmp.getEncoded(), "AES");
} else {
throw new RuntimeException("Couldn't initalize encryption key");
}
} else {
k = null;
LOG.warn("Void crypto key passed! AuthN Store Encryption disabled");
}
}
protected String encrypt(String token) {
if (k == null) {
return token;
}
String cryptostring = null;
try {
Cipher c = Cipher.getInstance("AES/CBC/PKCS5Padding");
c.init(Cipher.ENCRYPT_MODE, k, ivspec);
byte[] cryptobytes = c.doFinal(token.getBytes());
cryptostring = DatatypeConverter.printBase64Binary(cryptobytes);
return ENCRYPTED_TAG + cryptostring;
} catch (Exception e) {
LOG.error("Couldn't encrypt token", e);
return null;
}
}
protected String decrypt(String eToken) {
if (k == null) {
return eToken;
}
if (eToken == null || eToken.length() == 0) {
return null;
}
if (!eToken.startsWith(ENCRYPTED_TAG)) {
return eToken;
}
try {
Cipher c = Cipher.getInstance("AES/CBC/PKCS5Padding");
c.init(Cipher.DECRYPT_MODE, k, ivspec);
byte[] cryptobytes = DatatypeConverter.parseBase64Binary(eToken.substring(ENCRYPTED_TAG.length()));
byte[] clearbytes = c.doFinal(cryptobytes);
return DatatypeConverter.printBase64Binary(clearbytes);
} catch (Exception e) {
LOG.error("Couldn't decrypt token", e);
return null;
}
}
}
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