1 files changed, 43 insertions, 0 deletions
diff --git a/src/crypto/zinc/curve25519/curve25519-arm-glue.c b/src/crypto/zinc/curve25519/curve25519-arm-glue.c
new file mode 100644
index 0000000..cea06f3
--- /dev/null
+++ b/src/crypto/zinc/curve25519/curve25519-arm-glue.c
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: GPL-2.0 OR MIT
+/*
+ * Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ */
+
+#include <linux/simd.h>
+#include <asm/hwcap.h>
+#include <asm/neon.h>
+
+asmlinkage void curve25519_neon(u8 mypublic[CURVE25519_KEY_SIZE],
+				const u8 secret[CURVE25519_KEY_SIZE],
+				const u8 basepoint[CURVE25519_KEY_SIZE]);
+
+static bool curve25519_use_neon __ro_after_init;
+
+static void __init curve25519_fpu_init(void)
+{
+	curve25519_use_neon = elf_hwcap & HWCAP_NEON;
+}
+
+static inline bool curve25519_arch(u8 mypublic[CURVE25519_KEY_SIZE],
+				   const u8 secret[CURVE25519_KEY_SIZE],
+				   const u8 basepoint[CURVE25519_KEY_SIZE])
+{
+	simd_context_t simd_context;
+	bool used_arch = false;
+
+	simd_get(&simd_context);
+	if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) &&
+	    !IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) && curve25519_use_neon &&
+	    simd_use(&simd_context)) {
+		curve25519_neon(mypublic, secret, basepoint);
+		used_arch = true;
+	}
+	simd_put(&simd_context);
+	return used_arch;
+}
+
+static inline bool curve25519_base_arch(u8 pub[CURVE25519_KEY_SIZE],
+					const u8 secret[CURVE25519_KEY_SIZE])
+{
+	return false;
+}