refactor: use buffer-layout to clean up buffer encoding

web3.js/src/layout.js

@@ -0,0 +1,18 @@
+// @flow
+
+import * as BufferLayout from 'buffer-layout';
+
+
+/**
+ * Layout for a public key
+ */
+export const publicKey = (property: string = 'publicKey'): Object => {
+  return BufferLayout.blob(32, property);
+};
+
+/**
+ * Layout for a 256bit unsigned value
+ */
+export const uint256 = (property: string = 'uint256'): Object => {
+  return BufferLayout.blob(32, property);
+};