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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*
*/
package org.apache.qpid.server.security.encryption;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.xml.bind.DatatypeConverter;
import org.apache.qpid.server.configuration.IllegalConfigurationException;
class AESKeyFileEncrypter implements ConfigurationSecretEncrypter
{
private static final String CIPHER_NAME = "AES/CBC/PKCS5Padding";
private static final int AES_INITIALIZATION_VECTOR_LENGTH = 16;
private final SecretKey _secretKey;
private final SecureRandom _random = new SecureRandom();
AESKeyFileEncrypter(SecretKey secretKey)
{
_secretKey = secretKey;
}
@Override
public String encrypt(final String unencrypted)
{
byte[] unencryptedBytes = unencrypted.getBytes(StandardCharsets.UTF_8);
try
{
byte[] ivbytes = new byte[AES_INITIALIZATION_VECTOR_LENGTH];
_random.nextBytes(ivbytes);
Cipher cipher = Cipher.getInstance(CIPHER_NAME);
cipher.init(Cipher.ENCRYPT_MODE, _secretKey, new IvParameterSpec(ivbytes));
byte[] encryptedBytes = readFromCipherStream(unencryptedBytes, cipher);
byte[] output = new byte[AES_INITIALIZATION_VECTOR_LENGTH + encryptedBytes.length];
System.arraycopy(ivbytes, 0, output, 0, AES_INITIALIZATION_VECTOR_LENGTH);
System.arraycopy(encryptedBytes, 0, output, AES_INITIALIZATION_VECTOR_LENGTH, encryptedBytes.length);
return DatatypeConverter.printBase64Binary(output);
}
catch (IOException | InvalidAlgorithmParameterException | InvalidKeyException | NoSuchAlgorithmException | NoSuchPaddingException e)
{
throw new IllegalConfigurationException("Unable to encrypt secret", e);
}
}
@Override
public String decrypt(final String encrypted)
{
byte[] encryptedBytes = DatatypeConverter.parseBase64Binary(encrypted);
try
{
Cipher cipher = Cipher.getInstance(CIPHER_NAME);
cipher.init(Cipher.DECRYPT_MODE, _secretKey, new IvParameterSpec(encryptedBytes, 0,
AES_INITIALIZATION_VECTOR_LENGTH));
return new String(readFromCipherStream(encryptedBytes,
AES_INITIALIZATION_VECTOR_LENGTH,
encryptedBytes.length - AES_INITIALIZATION_VECTOR_LENGTH,
cipher), StandardCharsets.UTF_8);
}
catch (IOException | InvalidAlgorithmParameterException | InvalidKeyException | NoSuchAlgorithmException | NoSuchPaddingException e)
{
throw new IllegalConfigurationException("Unable to encrypt secret", e);
}
}
private byte[] readFromCipherStream(final byte[] unencryptedBytes, final Cipher cipher) throws IOException
{
return readFromCipherStream(unencryptedBytes, 0, unencryptedBytes.length, cipher);
}
private byte[] readFromCipherStream(final byte[] unencryptedBytes, int offset, int length, final Cipher cipher)
throws IOException
{
final byte[] encryptedBytes;
try (CipherInputStream cipherInputStream = new CipherInputStream(new ByteArrayInputStream(unencryptedBytes,
offset,
length), cipher))
{
byte[] buf = new byte[1024];
int pos = 0;
int read;
while ((read = cipherInputStream.read(buf, pos, buf.length - pos)) != -1)
{
pos += read;
if (pos == buf.length - 1)
{
byte[] tmp = buf;
buf = new byte[buf.length + 1024];
System.arraycopy(tmp, 0, buf, 0, tmp.length);
}
}
encryptedBytes = new byte[pos];
System.arraycopy(buf, 0, encryptedBytes, 0, pos);
}
return encryptedBytes;
}
}
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