EncryptedPackageEnvelope.IsEncryptedPackageEnvelope Method

Definition

Namespace:

System.IO.Packaging

Assembly:

WindowsBase.dll

Gets a value specifying whether the file is an OLE compound file with an encrypted package stream.

Overloads

IsEncryptedPackageEnvelope(Stream)	Gets a value specifying whether the specified stream is an OLE compound file with an encrypted package stream.
IsEncryptedPackageEnvelope(String)	Gets a value specifying whether the specified file is an OLE compound file with an encrypted package stream.

IsEncryptedPackageEnvelope(Stream)

Gets a value specifying whether the specified stream is an OLE compound file with an encrypted package stream.

C#

public static bool IsEncryptedPackageEnvelope(System.IO.Stream stream);

Parameters

stream

Stream

The stream that is tested.

Returns

Boolean

true if the specified stream is an OLE compound file with an encrypted package stream; otherwise, false.

Exceptions

ArgumentNullException

stream is null.

IsEncryptedPackageEnvelope(String)

Gets a value specifying whether the specified file is an OLE compound file with an encrypted package stream.

C#

public static bool IsEncryptedPackageEnvelope(string fileName);

Parameters

fileName

String

The file that is tested.

Returns

Boolean

true if the specified file is an OLE compound file with an encrypted package stream; otherwise, false.

Exceptions

ArgumentNullException

fileName is null.

Examples

The following example shows how to use this method to test for encryption.

C#

WriteStatus("   Signing the UnsignedPublishLicense\n" +
            "       to build the PublishLicense.");
UseLicense authorsUseLicense;
PublishLicense publishLicense =
    unsignedLicense.Sign(_secureEnv, out authorsUseLicense);

WriteStatus("   Binding the author's UseLicense and");
WriteStatus("       obtaining the CryptoProvider.");
CryptoProvider cryptoProvider = authorsUseLicense.Bind(_secureEnv);

WriteStatus("   Creating the EncryptedPackage.");
Stream packageStream = File.OpenRead(packageFile);
EncryptedPackageEnvelope ePackage =
    EncryptedPackageEnvelope.CreateFromPackage(encryptedFile,
        packageStream, publishLicense, cryptoProvider);

WriteStatus("   Adding an author's UseLicense.");
RightsManagementInformation rmi =
    ePackage.RightsManagementInformation;
rmi.SaveUseLicense(author, authorsUseLicense);

ePackage.Close();
WriteStatus("   Done - Package encryption complete.");

WriteStatus("Verifying package encryption.");
if (EncryptedPackageEnvelope.IsEncryptedPackageEnvelope(encryptedFile))
{
    WriteStatus("   Confirmed - '" + encryptedFilename +
                "' is encrypted.");
}
else
{
    MessageBox.Show("ERROR: '" + encryptedFilename +
        "' is NOT ENCRYPTED.", "Encryption Error",
        MessageBoxButton.OK, MessageBoxImage.Error);
    WriteStatus("ERROR: '" + encryptedFilename +
                "' is NOT ENCRYPTED.\n");
    return false;
}