DataObject Class
Represents the object element of an XML signature that holds data to be signed.
Assembly: System.Security (in System.Security.dll)
The DataObject type exposes the following members.
| Name | Description | |
|---|---|---|
![]() | DataObject() | Initializes a new instance of the DataObject class. |
![]() | DataObject(String, String, String, XmlElement) | Initializes a new instance of the DataObject class with the specified identification, MIME type, encoding, and data. |
| Name | Description | |
|---|---|---|
![]() | Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
![]() | Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
![]() | GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
![]() | GetType | Gets the Type of the current instance. (Inherited from Object.) |
![]() | GetXml | Returns the XML representation of the DataObject object. |
![]() | LoadXml | Loads a DataObject state from an XML element. |
![]() | MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
![]() | ToString | Returns a string that represents the current object. (Inherited from Object.) |
Use the DataObject class to store information or metadata directly in an XML signature. For example, you can store the signature generation date or the signer's identity. The DataObject class may or may not be covered by the XML signature.
The class corresponds to the <Object> element in the World Wide Web Consortium (W3C) specification for XML Signatures. For more information about the W3C specification, see http://www.w3.org/TR/xmldsig-core/.
Note |
|---|
The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: MayLeakOnAbort. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes. |
The following code example demonstrates how to generate an enveloping XML signature.
#using <System.dll> #using <System.Xml.dll> #using <System.Security.dll> using namespace System; using namespace System::IO; using namespace System::Security::Cryptography; using namespace System::Security::Cryptography::Xml; using namespace System::Xml; int main() { // Create example data to sign. XmlDocument^ document = gcnew XmlDocument; XmlNode^ node = document->CreateNode( XmlNodeType::Element, "", "MyElement", "samples" ); node->InnerText = "This is some text"; document->AppendChild( node ); Console::Error->WriteLine( "Data to sign:\n{0}\n", document->OuterXml ); // Create the SignedXml message. SignedXml^ signedXml = gcnew SignedXml; RSA^ key = RSA::Create(); signedXml->SigningKey = key; // Create a data object to hold the data to sign. DataObject^ dataObject = gcnew DataObject; dataObject->Data = document->ChildNodes; dataObject->Id = "MyObjectId"; // Add the data object to the signature. signedXml->AddObject( dataObject ); // Create a reference to be able to package everything into the // message. Reference^ reference = gcnew Reference; reference->Uri = "#MyObjectId"; // Add it to the message. signedXml->AddReference( reference ); // Add a KeyInfo. KeyInfo^ keyInfo = gcnew KeyInfo; keyInfo->AddClause( gcnew RSAKeyValue( key ) ); signedXml->KeyInfo = keyInfo; // Compute the signature. signedXml->ComputeSignature(); // Get the XML representation of the signature. XmlElement^ xmlSignature = signedXml->GetXml(); Console::WriteLine( xmlSignature->OuterXml ); }
The following code example demonstrates how to check an XML signature.
#using <System.dll> #using <System.Security.dll> #using <System.Xml.dll> using namespace System; using namespace System::Security::Cryptography; using namespace System::Security::Cryptography::Xml; using namespace System::IO; using namespace System::Xml; int main() { array<String^>^args = System::Environment::GetCommandLineArgs(); Console::WriteLine( "Verifying {0}...", args[ 1 ] ); // Create a SignedXml. SignedXml^ signedXml = gcnew SignedXml; // Load the XML. XmlDocument^ xmlDocument = gcnew XmlDocument; xmlDocument->PreserveWhitespace = true; xmlDocument->Load( gcnew XmlTextReader( args[ 1 ] ) ); XmlNodeList^ nodeList = xmlDocument->GetElementsByTagName( "Signature" ); signedXml->LoadXml( safe_cast<XmlElement^>(nodeList[ 0 ]) ); if ( signedXml->CheckSignature() ) { Console::WriteLine( "Signature check OK" ); } else { Console::WriteLine( "Signature check FAILED" ); } }
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
