crypto: import zinc

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

1 files changed, 50 insertions, 0 deletions

diff --git a/src/crypto/zinc/curve25519/curve25519-x86_64-glue.h b/src/crypto/zinc/curve25519/curve25519-x86_64-glue.h
new file mode 100644
index 0000000..4499cd9
--- /dev/null
+++ b/src/crypto/zinc/curve25519/curve25519-x86_64-glue.h
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ */
+
+#include <zinc/curve25519.h>
+#include <crypto/algapi.h>
+#include <asm/cpufeature.h>
+#include <asm/processor.h>
+
+#include "curve25519-x86_64.h"
+
+static bool curve25519_use_bmi2 __ro_after_init;
+static bool curve25519_use_adx __ro_after_init;
+
+void __init curve25519_fpu_init(void)
+{
+	curve25519_use_bmi2 = boot_cpu_has(X86_FEATURE_BMI2);
+	curve25519_use_adx = boot_cpu_has(X86_FEATURE_BMI2) &&
+			     boot_cpu_has(X86_FEATURE_ADX);
+}
+
+static inline bool curve25519_arch(u8 mypublic[CURVE25519_POINT_SIZE],
+				   const u8 secret[CURVE25519_POINT_SIZE],
+				   const u8 basepoint[CURVE25519_POINT_SIZE])
+{
+	if (curve25519_use_adx) {
+		curve25519_adx(mypublic, secret, basepoint);
+		return true;
+	} else if (curve25519_use_bmi2) {
+		curve25519_bmi2(mypublic, secret, basepoint);
+		return true;
+	}
+	return false;
+}
+
+static inline bool curve25519_base_arch(u8 pub[CURVE25519_POINT_SIZE],
+					const u8 secret[CURVE25519_POINT_SIZE])
+{
+	if (curve25519_use_adx) {
+		curve25519_adx_base(pub, secret);
+		return true;
+	} else if (curve25519_use_bmi2) {
+		curve25519_bmi2_base(pub, secret);
+		return true;
+	}
+	return false;
+}
+
+#define HAVE_CURVE25519_ARCH_IMPLEMENTATION