From 7dfe22396e0c5a6b13a2212dafee922fdf71190b Mon Sep 17 00:00:00 2001
From: metalurgical <97008724+metalurgical@users.noreply.github.com>
Date: Thu, 18 Jan 2024 05:00:18 +0200
Subject: [PATCH] fix: use non-standard ecdh

---
 Sources/TorusUtils/Extensions/secp256k1+Extension.swift | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Sources/TorusUtils/Extensions/secp256k1+Extension.swift b/Sources/TorusUtils/Extensions/secp256k1+Extension.swift
index 35a8346f..dda2668b 100644
--- a/Sources/TorusUtils/Extensions/secp256k1+Extension.swift
+++ b/Sources/TorusUtils/Extensions/secp256k1+Extension.swift
@@ -7,7 +7,10 @@ public struct secp256k1 {}
 
 extension secp256k1 {
     public static func ecdh(publicKey: PublicKey, privateKey: SecretKey) throws -> [UInt8] {
-        return try Data(hex: ECDH.ecdh(sk: privateKey, pk: publicKey)).bytes.sha512()
+        let shared = try publicKey.mul(key: privateKey)
+        let serialized = try shared.serialize(compressed: true)
+        let data = Data(hex: serialized).dropFirst()
+        return data.bytes.sha512()
     }
 
     public static func ecdhWithHex(pubKeyHex: String, privateKeyHex: String) throws -> [UInt8] {