/*
* 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.hadoop.hbase.io.crypto.aes;
import java.io.InputStream;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.Key;
import javax.crypto.spec.IvParameterSpec;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.classification.InterfaceStability;
import org.apache.hadoop.hbase.io.crypto.Decryptor;
import com.google.common.base.Preconditions;
@InterfaceAudience.Private
@InterfaceStability.Evolving
public class AESDecryptor implements Decryptor {
private javax.crypto.Cipher cipher;
private Key key;
private byte[] iv;
private boolean initialized = false;
public AESDecryptor(javax.crypto.Cipher cipher) {
this.cipher = cipher;
}
javax.crypto.Cipher getCipher() {
return cipher;
}
@Override
public void setKey(Key key) {
Preconditions.checkNotNull(key, "Key cannot be null");
this.key = key;
}
@Override
public int getIvLength() {
return AES.IV_LENGTH;
}
@Override
public int getBlockSize() {
return AES.BLOCK_SIZE;
}
@Override
public void setIv(byte[] iv) {
Preconditions.checkNotNull(iv, "IV cannot be null");
Preconditions.checkArgument(iv.length == AES.IV_LENGTH, "Invalid IV length");
this.iv = iv;
}
@Override
public InputStream createDecryptionStream(InputStream in) {
if (!initialized) {
init();
}
return new javax.crypto.CipherInputStream(in, cipher);
}
@Override
public void reset() {
init();
}
protected void init() {
try {
if (iv == null) {
throw new NullPointerException("IV is null");
}
cipher.init(javax.crypto.Cipher.DECRYPT_MODE, key, new IvParameterSpec(iv));
} catch (InvalidKeyException e) {
throw new RuntimeException(e);
} catch (InvalidAlgorithmParameterException e) {
throw new RuntimeException(e);
}
initialized = true;
}
}