/// <summary>Decrypt the key and iv of the negotiated cipher option.</summary>
/// <param name="option">negotiated cipher option</param>
/// <param name="sasl">SASL participant representing client</param>
/// <returns>
/// CipherOption negotiated cipher option which contains the
/// decrypted key and iv
/// </returns>
/// <exception cref="System.IO.IOException">for any error</exception>
public static CipherOption Unwrap(CipherOption option, SaslParticipant sasl)
{
if (option != null)
{
byte[] inKey = option.GetInKey();
if (inKey != null)
{
inKey = sasl.Unwrap(inKey, 0, inKey.Length);
}
byte[] outKey = option.GetOutKey();
if (outKey != null)
{
outKey = sasl.Unwrap(outKey, 0, outKey.Length);
}
return(new CipherOption(option.GetCipherSuite(), inKey, option.GetInIv(), outKey,
option.GetOutIv()));
}
return(null);
}
/// <summary>
/// Create IOStreamPair of
/// <see cref="Org.Apache.Hadoop.Crypto.CryptoInputStream"/>
/// and
/// <see cref="Org.Apache.Hadoop.Crypto.CryptoOutputStream"/>
/// </summary>
/// <param name="conf">the configuration</param>
/// <param name="cipherOption">negotiated cipher option</param>
/// <param name="out">underlying output stream</param>
/// <param name="in">underlying input stream</param>
/// <param name="isServer">is server side</param>
/// <returns>IOStreamPair the stream pair</returns>
/// <exception cref="System.IO.IOException">for any error</exception>
public static IOStreamPair CreateStreamPair(Configuration conf, CipherOption cipherOption
, OutputStream @out, InputStream @in, bool isServer)
{
if (Log.IsDebugEnabled())
{
Log.Debug("Creating IOStreamPair of CryptoInputStream and " + "CryptoOutputStream."
);
}
CryptoCodec codec = CryptoCodec.GetInstance(conf, cipherOption.GetCipherSuite());
byte[] inKey = cipherOption.GetInKey();
byte[] inIv = cipherOption.GetInIv();
byte[] outKey = cipherOption.GetOutKey();
byte[] outIv = cipherOption.GetOutIv();
InputStream cIn = new CryptoInputStream(@in, codec, isServer ? inKey : outKey, isServer
? inIv : outIv);
OutputStream cOut = new CryptoOutputStream(@out, codec, isServer ? outKey : inKey
, isServer ? outIv : inIv);
return(new IOStreamPair(cIn, cOut));
}