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diff --git a/crypto/arch/aarch64/crypto_cpu_caps_windows.c b/crypto/arch/aarch64/crypto_cpu_caps_windows.c
new file mode 100644
index 0000000..e7cdded
--- /dev/null
+++ b/crypto/arch/aarch64/crypto_cpu_caps_windows.c
@@ -0,0 +1,36 @@
+/* $OpenBSD: crypto_cpu_caps.c,v 1.2 2024/11/12 13:52:31 jsing Exp $ */
+/*
+ * Copyright (c) 2025 Brent Cook <bcook@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <windows.h>
+
+#include "crypto_arch.h"
+
+/* Machine dependent CPU capabilities. */
+uint64_t crypto_cpu_caps_aarch64;
+
+void
+crypto_cpu_caps_init(void)
+{
+ crypto_cpu_caps_aarch64 = 0;
+
+ if (IsProcessorFeaturePresent(PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE)) {
+ crypto_cpu_caps_aarch64 |= CRYPTO_CPU_CAPS_AARCH64_AES;
+ crypto_cpu_caps_aarch64 |= CRYPTO_CPU_CAPS_AARCH64_PMULL;
+ crypto_cpu_caps_aarch64 |= CRYPTO_CPU_CAPS_AARCH64_SHA1;
+ crypto_cpu_caps_aarch64 |= CRYPTO_CPU_CAPS_AARCH64_SHA2;
+ }
+}
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