Example usage for org.apache.hadoop.crypto CryptoOutputStream CryptoOutputStream

Introduction

In this page you can find the example usage for org.apache.hadoop.crypto CryptoOutputStream CryptoOutputStream.

Prototype

public CryptoOutputStream(OutputStream out, CryptoCodec codec, byte[] key, byte[] iv, long streamOffset)
            throws IOException 

Source Link

Usage

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

License:Apache License

/**
 * Wraps the stream in a CryptoOutputStream if the underlying file is
 * encrypted./* w w w.  j  a  v  a 2s. com*/
 */
public HdfsDataOutputStream createWrappedOutputStream(DFSOutputStream dfsos, FileSystem.Statistics statistics,
        long startPos) throws IOException {
    final FileEncryptionInfo feInfo = dfsos.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);
        KeyVersion decrypted = decryptEncryptedDataEncryptionKey(feInfo);
        final CryptoOutputStream cryptoOut = new CryptoOutputStream(dfsos, codec, decrypted.getMaterial(),
                feInfo.getIV(), startPos);
        return new HdfsDataOutputStream(cryptoOut, statistics, startPos);
    } else {
        // No FileEncryptionInfo present so no encryption.
        return new HdfsDataOutputStream(dfsos, statistics, startPos);
    }
}

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