Example usage for org.apache.hadoop.hdfs DFSInputStream getFileEncryptionInfo

Introduction

In this page you can find the example usage for org.apache.hadoop.hdfs DFSInputStream getFileEncryptionInfo.

Prototype

public FileEncryptionInfo getFileEncryptionInfo() 

Source Link

Usage

From source file:com.mellanox.r4h.DFSClient.java

License:Apache License

/**
 * Wraps the stream in a CryptoInputStream if the underlying file is
 * encrypted.//from  www.ja v a  2s. c  o m
 */
public HdfsDataInputStream createWrappedInputStream(DFSInputStream dfsis) throws IOException {
    final FileEncryptionInfo feInfo = dfsis.getFileEncryptionInfo();
    if (feInfo != null) {
        // File is encrypted, wrap the stream in a crypto stream.
        // Currently only one version, so no special logic based on the version #
        getCryptoProtocolVersion(feInfo);
        final CryptoCodec codec = getCryptoCodec(conf, feInfo);
        final KeyVersion decrypted = decryptEncryptedDataEncryptionKey(feInfo);
        final CryptoInputStream cryptoIn = new CryptoInputStream(dfsis, codec, decrypted.getMaterial(),
                feInfo.getIV());
        return new HdfsDataInputStream(cryptoIn);
    } else {
        // No FileEncryptionInfo so no encryption.
        return new HdfsDataInputStream(dfsis);
    }
}

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