From e41dbc3ddbe30a414e73fa25d9c7c304ffe6989e Mon Sep 17 00:00:00 2001
From: Nikias Bassen
Date: Wed, 9 Feb 2022 04:04:36 +0100
Subject: Add support for wireless pairing

---
 3rd_party/ed25519/sign.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 3rd_party/ed25519/sign.c

(limited to '3rd_party/ed25519/sign.c')

diff --git a/3rd_party/ed25519/sign.c b/3rd_party/ed25519/sign.c
new file mode 100644
index 0000000..199a839
--- /dev/null
+++ b/3rd_party/ed25519/sign.c
@@ -0,0 +1,31 @@
+#include "ed25519.h"
+#include "sha512.h"
+#include "ge.h"
+#include "sc.h"
+
+
+void ed25519_sign(unsigned char *signature, const unsigned char *message, size_t message_len, const unsigned char *public_key, const unsigned char *private_key) {
+    sha512_context hash;
+    unsigned char hram[64];
+    unsigned char r[64];
+    ge_p3 R;
+
+
+    sha512_init(&hash);
+    sha512_update(&hash, private_key + 32, 32);
+    sha512_update(&hash, message, message_len);
+    sha512_final(&hash, r);
+
+    sc_reduce(r);
+    ge_scalarmult_base(&R, r);
+    ge_p3_tobytes(signature, &R);
+
+    sha512_init(&hash);
+    sha512_update(&hash, signature, 32);
+    sha512_update(&hash, public_key, 32);
+    sha512_update(&hash, message, message_len);
+    sha512_final(&hash, hram);
+
+    sc_reduce(hram);
+    sc_muladd(signature + 32, hram, private_key, r);
+}
-- 
cgit v1.1-32-gdbae