add ecdsa utils

app/utils/ecdsa.js

@@ -0,0 +1,19 @@
+import { ec } from 'elliptic';
+
+const EC = new ec('secp256k1');
+
+export const generateXY = pub => {
+  const stripped = pub.slice(2);
+  const key = EC.keyFromPublic(stripped, 'hex');
+  const pubPoint = key.getPublic();
+  const x = '0x' + pubPoint.getX().toString(16);
+  const y = '0x'+ pubPoint.getY().toString(16);
+  return { x, y };
+}
+
+export const keyFromXY = (X, Y) => {
+  const x = Buffer.from(X.substring(2), 'hex');
+  const y = Buffer.from(Y.substring(2), 'hex');
+  const keys = EC.keyFromPublic({ x, y }, 'hex');
+  return `0x${keys.getPublic().encode('hex')}`;
+}