org.apache.hadoop.crypto.CryptoStreamUtils Maven / Gradle / Ivy
/**
* 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.crypto;
import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.HADOOP_SECURITY_CRYPTO_BUFFER_SIZE_DEFAULT;
import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.HADOOP_SECURITY_CRYPTO_BUFFER_SIZE_KEY;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Seekable;
import org.apache.hadoop.util.CleanerUtil;
import org.apache.hadoop.thirdparty.com.google.common.base.Preconditions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@InterfaceAudience.Private
public class CryptoStreamUtils {
private static final int MIN_BUFFER_SIZE = 512;
private static final Logger LOG =
LoggerFactory.getLogger(CryptoStreamUtils.class);
/** Forcibly free the direct buffer. */
public static void freeDB(ByteBuffer buffer) {
if (CleanerUtil.UNMAP_SUPPORTED) {
try {
CleanerUtil.getCleaner().freeBuffer(buffer);
} catch (IOException e) {
LOG.info("Failed to free the buffer", e);
}
} else {
LOG.trace(CleanerUtil.UNMAP_NOT_SUPPORTED_REASON);
}
}
/** Read crypto buffer size */
public static int getBufferSize(Configuration conf) {
return conf.getInt(HADOOP_SECURITY_CRYPTO_BUFFER_SIZE_KEY,
HADOOP_SECURITY_CRYPTO_BUFFER_SIZE_DEFAULT);
}
/** AES/CTR/NoPadding is required */
public static void checkCodec(CryptoCodec codec) {
if (codec.getCipherSuite() != CipherSuite.AES_CTR_NOPADDING) {
throw new UnsupportedCodecException("AES/CTR/NoPadding is required");
}
}
/** Check and floor buffer size */
public static int checkBufferSize(CryptoCodec codec, int bufferSize) {
Preconditions.checkArgument(bufferSize >= MIN_BUFFER_SIZE,
"Minimum value of buffer size is " + MIN_BUFFER_SIZE + ".");
return bufferSize - bufferSize % codec.getCipherSuite()
.getAlgorithmBlockSize();
}
/**
* If input stream is {@link org.apache.hadoop.fs.Seekable}, return it's
* current position, otherwise return 0;
*/
public static long getInputStreamOffset(InputStream in) throws IOException {
if (in instanceof Seekable) {
return ((Seekable) in).getPos();
}
return 0;
}
}