Net.Pkcs11Interop.LowLevelAPI81.Pkcs11.C_UnwrapKey C# (CSharp) Method

        public CKR C_UnwrapKey(ulong session, ref CK_MECHANISM mechanism, ulong unwrappingKey, byte[] wrappedKey, ulong wrappedKeyLen, CK_ATTRIBUTE[] template, ulong attributeCount, ref ulong key)
        {
            if (this._disposed)
                throw new ObjectDisposedException(this.GetType().FullName);

            ulong rv = _delegates.C_UnwrapKey(session, ref mechanism, unwrappingKey, wrappedKey, wrappedKeyLen, template, attributeCount, ref key);
            return (CKR)Convert.ToUInt32(rv);
        }

        public void _01_BasicWrapAndUnwrapKeyTest()
        {
            if (Platform.UnmanagedLongSize != 8 || Platform.StructPackingSize != 1)
                Assert.Inconclusive("Test cannot be executed on this platform");

            CKR rv = CKR.CKR_OK;
            
            using (Pkcs11 pkcs11 = new Pkcs11(Settings.Pkcs11LibraryPath))
            {
                rv = pkcs11.C_Initialize(Settings.InitArgs81);
                if ((rv != CKR.CKR_OK) && (rv != CKR.CKR_CRYPTOKI_ALREADY_INITIALIZED))
                    Assert.Fail(rv.ToString());
                
                // Find first slot with token present
                ulong slotId = Helpers.GetUsableSlot(pkcs11);
                
                ulong session = CK.CK_INVALID_HANDLE;
                rv = pkcs11.C_OpenSession(slotId, (CKF.CKF_SERIAL_SESSION | CKF.CKF_RW_SESSION), IntPtr.Zero, IntPtr.Zero, ref session);
                if (rv != CKR.CKR_OK)
                    Assert.Fail(rv.ToString());
                
                // Login as normal user
                rv = pkcs11.C_Login(session, CKU.CKU_USER, Settings.NormalUserPinArray, Convert.ToUInt64(Settings.NormalUserPinArray.Length));
                if (rv != CKR.CKR_OK)
                    Assert.Fail(rv.ToString());
                
                // Generate asymetric key pair
                ulong pubKeyId = CK.CK_INVALID_HANDLE;
                ulong privKeyId = CK.CK_INVALID_HANDLE;
                rv = Helpers.GenerateKeyPair(pkcs11, session, ref pubKeyId, ref privKeyId);
                if (rv != CKR.CKR_OK)
                    Assert.Fail(rv.ToString());
                
                // Generate symetric key
                ulong keyId = CK.CK_INVALID_HANDLE;
                rv = Helpers.GenerateKey(pkcs11, session, ref keyId);
                if (rv != CKR.CKR_OK)
                    Assert.Fail(rv.ToString());

                // Specify wrapping mechanism (needs no parameter => no unamanaged memory is needed)
                CK_MECHANISM mechanism = CkmUtils.CreateMechanism(CKM.CKM_RSA_PKCS);

                // Get length of wrapped key in first call
                ulong wrappedKeyLen = 0;
                rv = pkcs11.C_WrapKey(session, ref mechanism, pubKeyId, keyId, null, ref wrappedKeyLen);
                if (rv != CKR.CKR_OK)
                    Assert.Fail(rv.ToString());

                Assert.IsTrue(wrappedKeyLen > 0);
                
                // Allocate array for wrapped key
                byte[] wrappedKey = new byte[wrappedKeyLen];

                // Get wrapped key in second call
                rv = pkcs11.C_WrapKey(session, ref mechanism, pubKeyId, keyId, wrappedKey, ref wrappedKeyLen);
                if (rv != CKR.CKR_OK)
                    Assert.Fail(rv.ToString());

                // Do something interesting with wrapped key

                // Define attributes for unwrapped key
                CK_ATTRIBUTE[] template = new CK_ATTRIBUTE[6];
                template[0] = CkaUtils.CreateAttribute(CKA.CKA_CLASS, CKO.CKO_SECRET_KEY);
                template[1] = CkaUtils.CreateAttribute(CKA.CKA_KEY_TYPE, CKK.CKK_DES3);
                template[2] = CkaUtils.CreateAttribute(CKA.CKA_ENCRYPT, true);
                template[3] = CkaUtils.CreateAttribute(CKA.CKA_DECRYPT, true);
                template[4] = CkaUtils.CreateAttribute(CKA.CKA_DERIVE, true);
                template[5] = CkaUtils.CreateAttribute(CKA.CKA_EXTRACTABLE, true);

                // Unwrap key
                ulong unwrappedKeyId = 0;
                rv = pkcs11.C_UnwrapKey(session, ref mechanism, privKeyId, wrappedKey, wrappedKeyLen, template, Convert.ToUInt64(template.Length), ref unwrappedKeyId);
                if (rv != CKR.CKR_OK)
                    Assert.Fail(rv.ToString());

                // Do something interesting with unwrapped key

                rv = pkcs11.C_DestroyObject(session, privKeyId);
                if (rv != CKR.CKR_OK)
                    Assert.Fail(rv.ToString());
                
                rv = pkcs11.C_DestroyObject(session, pubKeyId);
                if (rv != CKR.CKR_OK)
                    Assert.Fail(rv.ToString());
                
                rv = pkcs11.C_DestroyObject(session, keyId);
                if (rv != CKR.CKR_OK)
                    Assert.Fail(rv.ToString());
                
                rv = pkcs11.C_Logout(session);
                if (rv != CKR.CKR_OK)
                    Assert.Fail(rv.ToString());
                
                rv = pkcs11.C_CloseSession(session);
                if (rv != CKR.CKR_OK)
                    Assert.Fail(rv.ToString());
                
                rv = pkcs11.C_Finalize(IntPtr.Zero);
                if (rv != CKR.CKR_OK)
                    Assert.Fail(rv.ToString());
            }
        }