init

static/js/dhke.js

@@ -0,0 +1,31 @@
+async function hashToCurve(secretMessage) {
+  let point
+  while (!point) {
+    const hash = await nobleSecp256k1.utils.sha256(secretMessage)
+    const hashHex = nobleSecp256k1.utils.bytesToHex(hash)
+    const pointX = '02' + hashHex
+    try {
+      point = nobleSecp256k1.Point.fromHex(pointX)
+    } catch (error) {
+      secretMessage = await nobleSecp256k1.utils.sha256(secretMessage)
+    }
+  }
+  return point
+}
+
+async function step1Alice(secretMessage) {
+  secretMessage = uint8ToBase64.encode(secretMessage)
+  secretMessage = new TextEncoder().encode(secretMessage)
+  const Y = await hashToCurve(secretMessage)
+  const r_bytes = nobleSecp256k1.utils.randomPrivateKey()
+  const r = bytesToNumber(r_bytes)
+  const P = nobleSecp256k1.Point.fromPrivateKey(r)
+  const B_ = Y.add(P)
+  return {B_: B_.toHex(true), r: nobleSecp256k1.utils.bytesToHex(r_bytes)}
+}
+
+function step3Alice(C_, r, A) {
+  const rInt = bytesToNumber(r)
+  const C = C_.subtract(A.multiply(rInt))
+  return C
+}