use tiny-secp256k1, updated nip06 and other utils.

index.js

@@ -1,3 +1,4 @@
+import {generatePrivateKey, getPublicKey} from './keys'
 import {relayConnect} from './relay'
 import {relayPool} from './pool'
 import {
@@ -8,7 +9,6 @@ import {
   getEventHash
 } from './event'
 import {matchFilter, matchFilters} from './filter'
-import {makeRandom32, sha256, getPublicKey} from './utils'
 
 export {
   relayConnect,
@@ -17,8 +17,6 @@ export {
   verifySignature,
   serializeEvent,
   getEventHash,
-  makeRandom32,
-  sha256,
   getPublicKey,
   getBlankEvent,
   matchFilter,