1 files changed, 60 insertions, 0 deletions

diff --git a/crypto/arch/aarch64/crypto_cpu_caps_darwin.c b/crypto/arch/aarch64/crypto_cpu_caps_darwin.c
new file mode 100644
index 0000000..1dd91b2
--- /dev/null
+++ b/crypto/arch/aarch64/crypto_cpu_caps_darwin.c
@@ -0,0 +1,60 @@
+/* $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 <sys/sysctl.h>
+
+#include "crypto_arch.h"
+
+/* Machine dependent CPU capabilities. */
+uint64_t crypto_cpu_caps_aarch64;
+
+static uint64_t
+check_cpu_cap(const char *cap_name, uint64_t cap_flag)
+{
+        int has_cap = 0;
+        size_t len = sizeof(has_cap);
+
+        sysctlbyname(cap_name, &has_cap, &len, NULL, 0);
+
+        return has_cap ? cap_flag : 0;
+}
+
+void
+crypto_cpu_caps_init(void)
+{
+        crypto_cpu_caps_aarch64 = 0;
+
+        /* from https://developer.apple.com/documentation/kernel/1387446-sysctlbyname/determining_instruction_set_characteristics#3918855 */
+
+        crypto_cpu_caps_aarch64 |= check_cpu_cap("hw.optional.arm.FEAT_AES",
+                CRYPTO_CPU_CAPS_AARCH64_AES);
+
+        crypto_cpu_caps_aarch64 |= check_cpu_cap("hw.optional.arm.FEAT_PMULL",
+                CRYPTO_CPU_CAPS_AARCH64_PMULL);
+
+        crypto_cpu_caps_aarch64 |= check_cpu_cap("hw.optional.arm.FEAT_SHA1",
+                CRYPTO_CPU_CAPS_AARCH64_SHA1);
+
+        crypto_cpu_caps_aarch64 |= check_cpu_cap("hw.optional.arm.FEAT_SHA256",
+                CRYPTO_CPU_CAPS_AARCH64_SHA2);
+
+        crypto_cpu_caps_aarch64 |= check_cpu_cap("hw.optional.arm.FEAT_SHA512",
+                CRYPTO_CPU_CAPS_AARCH64_SHA512);
+
+        crypto_cpu_caps_aarch64 |= check_cpu_cap("hw.optional.arm.FEAT_SHA3",
+                CRYPTO_CPU_CAPS_AARCH64_SHA3);
+}