/// <summary>
/// A helper method of to decrypt stream for a specific
/// remoting call.
/// </summary>
/// <param name="identity">call identity</param>
/// <param name="sinkType">sink type, either server sink or client sink</param>
/// <param name="transportHeaders">ITransportHeaders object</param>
/// <param name="targetStream">stream to be decrypted.</param>
/// <returns>decrypted stream</returns>
public Stream DecryptStream(string identity, string sinkType, ITransportHeaders transportHeaders, Stream targetStream)
{
byte[] key;
byte[] iv;
byte[] signature;
Stream decryptedStream = null;
string profileName = cc.GetProfileNameByIdentity(identity, "Decrypt", sinkType);
//perform the data encryption on request
if (cc.CheckIfSymmatric(profileName))
{
//decrypt the stream.
decryptedStream = Decryption.Decrypt(targetStream, profileName);
}
else
{
//retrieve addtional information from the transport headers.
key = ConvertStringToBytes(transportHeaders["key"].ToString());
iv = ConvertStringToBytes(transportHeaders["iv"].ToString());
signature = ConvertStringToBytes(transportHeaders["signature"].ToString());
//decrypt the stream
decryptedStream = Decryption.Decrypt(targetStream, profileName, key, iv, signature);
}
return(decryptedStream);
}
/// <summary>
/// decrypt the string data symmetrically using the security profile
/// information stored in the configuration file
/// </summary>
/// <param name="data">encrypted string data</param>
/// <param name="profile">security profile name</param>
/// <returns>decrypted string</returns>
public static string Decrypt(string data, string profile)
{
//convert the string to stream
MemoryStream original = new MemoryStream(Encoding.Default.GetBytes(data));
Stream decryptedStream = Decryption.Decrypt(original, profile);
byte[] decryptedData = new Byte[decryptedStream.Length];
decryptedStream.Read(decryptedData, 0, decryptedData.Length);
//convert the stream to string
return(Encoding.Default.GetString(decryptedData));
}
