EncryptedPackageEnvelope.CreateFromPackage Method


Creates and returns an EncryptedPackageEnvelope that uses an existing unencrypted package as the source of its content.

Namespace:   System.IO.Packaging
Assembly:  WindowsBase (in WindowsBase.dll)

System_CAPS_pubmethodSystem_CAPS_staticCreateFromPackage(Stream, Stream, PublishLicense, CryptoProvider)

Creates and returns an EncryptedPackageEnvelope (on the specified stream) that uses the specified unencrypted package as its content.

System_CAPS_pubmethodSystem_CAPS_staticCreateFromPackage(String, Stream, PublishLicense, CryptoProvider)

Creates and returns an EncryptedPackageEnvelope that uses the specified unencrypted package as its content, and gives it the specified file name.

The following example shows how to use the CreateFromPackage method to instantiate an EncryptedPackageEnvelope.

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 =
        packageStream, publishLicense, cryptoProvider);

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

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

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