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/*******************************************************************************
* ============LICENSE_START====================================================
* * org.onap.aai
* * ===========================================================================
* * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
* * Copyright © 2017 Amdocs
* * ===========================================================================
* * 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====================================================
* *
* * ECOMP is a trademark and service mark of AT&T Intellectual Property.
* *
******************************************************************************/
package com.att.cadi;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.CipherOutputStream;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import com.att.cadi.util.Chmod;
public class AES {
public static final String AES = AES.class.getSimpleName();
public static final int AES_KEY_SIZE = 128; // 256 isn't supported on all JDKs.
private Cipher aesCipher;
private SecretKeySpec aeskeySpec;
public AES() throws IOException, NoSuchAlgorithmException, NoSuchPaddingException {
aesCipher = Cipher.getInstance(AES);
aeskeySpec = new SecretKeySpec(newKey().getEncoded(), AES);
}
public static SecretKey newKey() throws NoSuchAlgorithmException {
KeyGenerator kgen = KeyGenerator.getInstance(AES);
kgen.init(AES_KEY_SIZE);
return kgen.generateKey();
}
public AES(File keyfile) throws IOException, NoSuchAlgorithmException, NoSuchPaddingException {
aesCipher = Cipher.getInstance(AES);
byte[] aesKey = new byte[AES_KEY_SIZE/8];
FileInputStream fis = new FileInputStream(keyfile);
try {
fis.read(aesKey);
} finally {
fis.close();
}
aeskeySpec = new SecretKeySpec(aesKey,AES);
}
public AES(byte[] aeskey, int offset, int len) throws IOException, NoSuchAlgorithmException, NoSuchPaddingException {
aesCipher = Cipher.getInstance(AES);
aeskeySpec = new SecretKeySpec(aeskey,offset,len,AES);
}
public byte[] encrypt(byte[] in) throws InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
aesCipher.init(Cipher.ENCRYPT_MODE,aeskeySpec);
return aesCipher.doFinal(in);
}
public byte[] decrypt(byte[] in) throws InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
aesCipher.init(Cipher.DECRYPT_MODE,aeskeySpec);
return aesCipher.doFinal(in);
}
public void save(File keyfile) throws IOException {
FileOutputStream fis = new FileOutputStream(keyfile);
try {
fis.write(aeskeySpec.getEncoded());
} finally {
fis.close();
}
Chmod.to400.chmod(keyfile);
}
public CipherOutputStream outputStream(OutputStream os, boolean encrypt) {
try {
if(encrypt) {
aesCipher.init(Cipher.ENCRYPT_MODE,aeskeySpec);
} else {
aesCipher.init(Cipher.DECRYPT_MODE,aeskeySpec);
}
} catch (InvalidKeyException e) {
// KeySpec created earlier... no chance being wrong.
}
return new CipherOutputStream(os,aesCipher);
}
public CipherInputStream inputStream(InputStream is, boolean encrypt) {
try {
if(encrypt) {
aesCipher.init(Cipher.ENCRYPT_MODE,aeskeySpec);
} else {
aesCipher.init(Cipher.DECRYPT_MODE,aeskeySpec);
}
} catch (InvalidKeyException e) {
// KeySpec created earlier... no chance being wrong.
}
return new CipherInputStream(is,aesCipher);
}
}
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