core/crypto/aes: Add AES implementation

core/crypto/aes/aes_impl.odin

@@ -0,0 +1,41 @@
+package aes
+
+import "core:crypto/_aes/ct64"
+import "core:mem"
+import "core:reflect"
+
+@(private)
+Context_Impl :: union {
+	ct64.Context,
+	Context_Impl_Hardware,
+}
+
+// Implementation is an AES implementation.  Most callers will not need
+// to use this as the package will automatically select the most performant
+// implementation available (See `is_hardware_accelerated()`).
+Implementation :: enum {
+	Portable,
+	Hardware,
+}
+
+@(private)
+init_impl :: proc(ctx: ^Context_Impl, key: []byte, impl: Implementation) {
+	impl := impl
+	if !is_hardware_accelerated() {
+		impl = .Portable
+	}
+
+	switch impl {
+	case .Portable:
+		reflect.set_union_variant_typeid(ctx^, typeid_of(ct64.Context))
+		ct64.init(&ctx.(ct64.Context), key)
+	case .Hardware:
+		reflect.set_union_variant_typeid(ctx^, typeid_of(Context_Impl_Hardware))
+		init_impl_hw(&ctx.(Context_Impl_Hardware), key)
+	}
+}
+
+@(private)
+reset_impl :: proc "contextless" (ctx: ^Context_Impl) {
+	mem.zero_explicit(ctx, size_of(Context_Impl))
+}