public static bool IsMachineKey(CngKey cngKey)
{
CngProperty propMT = cngKey.GetProperty("Key Type", CngPropertyOptions.None);
byte[] baMT = propMT.GetValue();
return((baMT[0] & 0x21) != 0); // https://docs.microsoft.com/en-us/windows/win32/seccng/key-storage-property-identifiers defines NCRYPT_MACHINE_KEY_FLAG as 1 (which the Platform Crypto Provider/TPM uses), but ncrypt.h defines it as 0x20, which is what other providers use
}
public static void SetPropertyZeroLengthCornerCase()
{
using (CngKey key = CngKey.Import(TestData.Key_ECDiffieHellmanP256, CngKeyBlobFormat.GenericPublicBlob))
{
const string propertyName = "CustomZeroLengthProperty";
CngProperty p = new CngProperty(propertyName, new byte[0], CngPropertyOptions.CustomProperty);
key.SetProperty(p);
CngProperty p2 = key.GetProperty(propertyName, CngPropertyOptions.CustomProperty);
Assert.Equal(propertyName, p2.Name);
Assert.Equal(CngPropertyOptions.CustomProperty, p2.Options);
// This one is odd. CNG keys can have properties with zero length but CngKey.GetProperty() transforms this into null.
Assert.Null(p2.GetValue());
}
}
public static void OverwriteProperties()
{
using (CngKey key = CngKey.Import(TestData.Key_ECDiffieHellmanP256, CngKeyBlobFormat.GenericPublicBlob))
{
string propertyName = "Are you there";
bool hasProperty = key.HasProperty(propertyName, CngPropertyOptions.CustomProperty);
Assert.False(hasProperty);
// Set it once.
byte[] propertyValue = { 1, 2, 3 };
CngProperty property = new CngProperty(propertyName, propertyValue, CngPropertyOptions.CustomProperty);
key.SetProperty(property);
// Set it again.
propertyValue = new byte[] { 5, 6, 7 };
property = new CngProperty(propertyName, propertyValue, CngPropertyOptions.CustomProperty);
key.SetProperty(property);
CngProperty retrievedProperty = key.GetProperty(propertyName, CngPropertyOptions.CustomProperty);
Assert.Equal(propertyName, retrievedProperty.Name);
Assert.Equal <byte>(propertyValue, retrievedProperty.GetValue());
Assert.Equal(CngPropertyOptions.CustomProperty, retrievedProperty.Options);
}
}
public static void NullValueRoundtrip()
{
CngProperty property = new CngProperty("banana", null, CngPropertyOptions.CustomProperty);
Assert.Null(property.GetValue());
}