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/*-
* ============LICENSE_START=======================================================
* OPENECOMP - MSO
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ============LICENSE_END=========================================================
*/
package org.openecomp.mso.utils;
import java.io.IOException;
import java.security.GeneralSecurityException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
/**
* CryptoUtils adapted from RTTP client.
*
*/
public final class CryptoUtils {
public static final String AES = "AES";
/**
* encrypt a value and generate a keyfile
* if the keyfile is not found then a new one is created
*
* @throws GeneralSecurityException
*/
public static String encrypt (String value, String keyString) throws GeneralSecurityException {
SecretKeySpec sks = getSecretKeySpec (keyString);
Cipher cipher = Cipher.getInstance (CryptoUtils.AES);
cipher.init (Cipher.ENCRYPT_MODE, sks, cipher.getParameters ());
byte[] encrypted = cipher.doFinal (value.getBytes ());
return byteArrayToHexString (encrypted);
}
/**
* decrypt a value
*
* @throws GeneralSecurityException
*/
public static String decrypt (String message, String keyString) throws GeneralSecurityException {
SecretKeySpec sks = getSecretKeySpec (keyString);
Cipher cipher = Cipher.getInstance (CryptoUtils.AES);
cipher.init (Cipher.DECRYPT_MODE, sks);
byte[] decrypted = cipher.doFinal (hexStringToByteArray (message));
return new String (decrypted);
}
private static SecretKeySpec getSecretKeySpec (String keyString) throws NoSuchAlgorithmException {
byte[] key = hexStringToByteArray (keyString);
SecretKeySpec sks = new SecretKeySpec (key, CryptoUtils.AES);
return sks;
}
public static String byteArrayToHexString (byte[] b) {
StringBuffer sb = new StringBuffer (b.length * 2);
for (int i = 0; i < b.length; i++) {
int v = b[i] & 0xff;
if (v < 16) {
sb.append ('0');
}
sb.append (Integer.toHexString (v));
}
return sb.toString ().toUpperCase ();
}
private static byte[] hexStringToByteArray (String s) {
byte[] b = new byte[s.length () / 2];
for (int i = 0; i < b.length; i++) {
int index = i * 2;
int v = Integer.parseInt (s.substring (index, index + 2), 16);
b[i] = (byte) v;
}
return b;
}
}
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