Add BCryptKeyDerivation

src/BCrypt/BCrypt+BCryptKeyDerivationFlags.cs

@@ -0,0 +1,27 @@
+// Copyright © .NET Foundation and Contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+namespace PInvoke
+{
+    /// <content>
+    /// Contains the <see cref="BCryptKeyDerivationFlags"/> nested type.
+    /// </content>
+    public partial class BCrypt
+    {
+        /// <summary>
+        /// Flags that may be passed to the <see cref="BCryptKeyDerivation(SafeKeyHandle, BCryptBufferDesc*, byte*, int, out int, BCryptKeyDerivationFlags)"/> method.
+        /// </summary>
+        public enum BCryptKeyDerivationFlags : uint
+        {
+            /// <summary>
+            /// No flags.
+            /// </summary>
+            None = 0x0,
+
+            /// <summary>
+            /// Specifies that the target algorithm is AES and that the key therefore must be double expanded. This flag is only valid with the CAPI_KDF algorithm.
+            /// </summary>
+            BCRYPT_CAPI_AES_FLAG = 0x00000010,
+        }
+    }
+}