Net.Pkcs11Interop.HighLevelAPI81.ObjectAttribute.GetValueAsObjectAttributeList C# (CSharp) Method

        public List<ObjectAttribute> GetValueAsObjectAttributeList()
        {
            if (this._disposed)
                throw new ObjectDisposedException(this.GetType().FullName);

            CK_ATTRIBUTE[] value = null;
            CkaUtils.ConvertValue(ref _ckAttribute, out value);

            List<ObjectAttribute> attributes = null;

            if (value != null)
            {
                attributes = new List<ObjectAttribute>();
                for (int i = 0; i < value.Length; i++)
                    attributes.Add(new ObjectAttribute(value[i]));
            }

            return attributes;
        }

        public void _08_AttributeArrayAttributeTest()
        {
            if (Platform.UnmanagedLongSize != 8 || Platform.StructPackingSize != 1)
                Assert.Inconclusive("Test cannot be executed on this platform");

            ObjectAttribute nestedAttribute1 = new ObjectAttribute(CKA.CKA_TOKEN, true);
            ObjectAttribute nestedAttribute2 = new ObjectAttribute(CKA.CKA_PRIVATE, true);

            List<ObjectAttribute> originalValue = new List<ObjectAttribute>();
            originalValue.Add(nestedAttribute1);
            originalValue.Add(nestedAttribute2);

            // Create attribute with attribute array value
            using (ObjectAttribute attr = new ObjectAttribute(CKA.CKA_WRAP_TEMPLATE, originalValue))
            {
                Assert.IsTrue(attr.Type == (ulong)CKA.CKA_WRAP_TEMPLATE);

                List<ObjectAttribute> recoveredValue = attr.GetValueAsObjectAttributeList();
                Assert.IsTrue(recoveredValue.Count == 2);
                Assert.IsTrue(recoveredValue[0].Type == (ulong)CKA.CKA_TOKEN);
                Assert.IsTrue(recoveredValue[0].GetValueAsBool() == true);
                Assert.IsTrue(recoveredValue[1].Type == (ulong)CKA.CKA_PRIVATE);
                Assert.IsTrue(recoveredValue[1].GetValueAsBool() == true);
            }

            // There is the same pointer to unmanaged memory in both nestedAttribute1 and recoveredValue[0] instances
            // therefore private low level attribute structure needs to be modified to prevent double free.
            // This special handling is needed only in this synthetic test and should be avoided in real world application.
            LLA81.CK_ATTRIBUTE ckAttribute1 = (LLA81.CK_ATTRIBUTE)typeof(ObjectAttribute).GetField("_ckAttribute", BindingFlags.NonPublic | BindingFlags.Instance).GetValue(nestedAttribute1);
            ckAttribute1.value = IntPtr.Zero;
            ckAttribute1.valueLen = 0;
            typeof(ObjectAttribute).GetField("_ckAttribute", BindingFlags.NonPublic | BindingFlags.Instance).SetValue(nestedAttribute1, ckAttribute1);

            // There is the same pointer to unmanaged memory in both nestedAttribute2 and recoveredValue[1] instances
            // therefore private low level attribute structure needs to be modified to prevent double free.
            // This special handling is needed only in this synthetic test and should be avoided in real world application.
            LLA81.CK_ATTRIBUTE ckAttribute2 = (LLA81.CK_ATTRIBUTE)typeof(ObjectAttribute).GetField("_ckAttribute", BindingFlags.NonPublic | BindingFlags.Instance).GetValue(nestedAttribute2);
            ckAttribute2.value = IntPtr.Zero;
            ckAttribute2.valueLen = 0;
            typeof(ObjectAttribute).GetField("_ckAttribute", BindingFlags.NonPublic | BindingFlags.Instance).SetValue(nestedAttribute2, ckAttribute2);

            originalValue = null;

            // Create attribute with null attribute array value
            using (ObjectAttribute attr = new ObjectAttribute(CKA.CKA_WRAP_TEMPLATE, originalValue))
            {
                Assert.IsTrue(attr.Type == (ulong)CKA.CKA_WRAP_TEMPLATE);
                Assert.IsTrue(attr.GetValueAsObjectAttributeList() == originalValue);
            }

            originalValue = new List<ObjectAttribute>();

            // Create attribute with empty attribute array value
            using (ObjectAttribute attr = new ObjectAttribute(CKA.CKA_WRAP_TEMPLATE, originalValue))
            {
                Assert.IsTrue(attr.Type == (ulong)CKA.CKA_WRAP_TEMPLATE);
                Assert.IsTrue(attr.GetValueAsObjectAttributeList() == null);
            }
        }