initial commit.

event.js

@@ -0,0 +1,39 @@
+import shajs from 'sha.js'
+import BigInteger from 'bigi'
+import schnorr from 'bip-schnorr'
+
+export function serializeEvent(evt) {
+  return JSON.stringify([
+    0,
+    evt.pubkey,
+    evt.created_at,
+    evt.kind,
+    evt.tags,
+    evt.content
+  ])
+}
+
+export function getEventID(event) {
+  let hash = shajs('sha256').update(serializeEvent(event)).digest()
+  return hash.toString('hex')
+}
+
+export function verifySignature(event) {
+  try {
+    schnorr.verify(
+      Buffer.from(event.pubkey, 'hex'),
+      Buffer.from(getEventID(event), 'hex'),
+      Buffer.from(event.sig, 'hex')
+    )
+    return true
+  } catch (err) {
+    return false
+  }
+}
+
+export function signEvent(event, key) {
+  let eventHash = shajs('sha256').update(serializeEvent(event)).digest()
+  schnorr
+    .sign(new BigInteger(key, 16), eventHash, makeRandom32())
+    .toString('hex')
+}