// The goal behind this method is to pump the input stream through the transforms and get back something that // can be hashed internal Stream TransformToOctetStream(Object inputObject, Type inputType, XmlResolver resolver, string strBaseUri) { Object currentInput = inputObject; foreach (Object obj in m_transforms) { Transform transform = obj as Transform; if (transform.AcceptsType(currentInput.GetType())) { //in this case, no translation necessary, pump it through transform.Resolver = resolver; transform.BaseURI = strBaseUri; transform.LoadInput(currentInput); currentInput = transform.GetOutput(); } else { // We need translation // For now, we just know about Stream->{XmlNodeList,XmlDocument} and {XmlNodeList,XmlDocument}->Stream if (currentInput is Stream) { if (transform.AcceptsType(typeof(XmlDocument))) { XmlDocument doc = new XmlDocument(); doc.PreserveWhitespace = true; XmlValidatingReader valReader = SignedXml.PreProcessStreamInput((Stream)currentInput, resolver, strBaseUri); doc.Load(valReader); transform.LoadInput(doc); currentInput = transform.GetOutput(); continue; } else { throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_TransformIncorrectInputType")); } } if (currentInput is XmlNodeList) { if (transform.AcceptsType(typeof(Stream))) { CanonicalXml c14n = new CanonicalXml((XmlNodeList)currentInput, false); MemoryStream ms = new MemoryStream(c14n.GetBytes()); transform.LoadInput((Stream)ms); currentInput = transform.GetOutput(); continue; } else { throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_TransformIncorrectInputType")); } } if (currentInput is XmlDocument) { if (transform.AcceptsType(typeof(Stream))) { CanonicalXml c14n = new CanonicalXml((XmlDocument)currentInput); MemoryStream ms = new MemoryStream(c14n.GetBytes()); transform.LoadInput((Stream)ms); currentInput = transform.GetOutput(); continue; } else { throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_TransformIncorrectInputType")); } } throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_TransformIncorrectInputType")); } } // Final processing, either we already have a stream or have to canonicalize if (currentInput is Stream) { return(currentInput as Stream); } if (currentInput is XmlNodeList) { CanonicalXml c14n = new CanonicalXml((XmlNodeList)currentInput, false); MemoryStream ms = new MemoryStream(c14n.GetBytes()); return(ms); } if (currentInput is XmlDocument) { CanonicalXml c14n = new CanonicalXml((XmlDocument)currentInput); MemoryStream ms = new MemoryStream(c14n.GetBytes()); return(ms); } throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_TransformIncorrectInputType")); }