// // private methods // private byte[] GetCipherValue(CipherData cipherData) { if (cipherData == null) { throw new ArgumentNullException("cipherData"); } WebResponse response = null; Stream inputStream = null; if (cipherData.CipherValue != null) { return(cipherData.CipherValue); } else if (cipherData.CipherReference != null) { if (cipherData.CipherReference.CipherValue != null) { return(cipherData.CipherReference.CipherValue); } Stream decInputStream = null; // See if the CipherReference is a local URI if (cipherData.CipherReference.Uri.Length == 0) { // self referenced Uri string baseUri = (m_document == null ? null : m_document.BaseURI); TransformChain tc = cipherData.CipherReference.TransformChain; decInputStream = tc.TransformToOctetStream(m_document, m_xmlResolver, baseUri); } else if (cipherData.CipherReference.Uri[0] == '#') { string idref = Utils.ExtractIdFromLocalUri(cipherData.CipherReference.Uri); // Serialize inputStream = new MemoryStream(m_encoding.GetBytes(GetIdElement(m_document, idref).OuterXml)); string baseUri = (m_document == null ? null : m_document.BaseURI); TransformChain tc = cipherData.CipherReference.TransformChain; decInputStream = tc.TransformToOctetStream(inputStream, m_xmlResolver, baseUri); } else { DownloadCipherValue(cipherData, out inputStream, out decInputStream, out response); } // read the output stream into a memory stream byte[] cipherValue = null; using (MemoryStream ms = new MemoryStream()) { Utils.Pump(decInputStream, ms); cipherValue = ms.ToArray(); // Close the stream and return if (response != null) { response.Close(); } if (inputStream != null) { inputStream.Close(); } decInputStream.Close(); } // cache the cipher value for Perf reasons in case we call this routine twice cipherData.CipherReference.CipherValue = cipherValue; return(cipherValue); } // Throw a CryptographicException if we were unable to retrieve the cipher data. throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_MissingCipherData")); }