Merge pull request #6470 from blockchain/fix/login-tfa

fix(login-tfa): Change crypto implementation used in 2FA.

Author: CTucker-BC

packages/blockchain-wallet-v4/src/types/Wrapper.js

@@ -8,13 +8,6 @@ import * as Options from './Options'
 import Type from './Type'
 import * as Wallet from './Wallet'
 
-let _window = {}
-if (typeof window === 'undefined' || !window) _window = {}
-else _window = window
-
-// Global Crypto object
-const { Crypto } = _window
-
 const PAYLOAD_VERSION = crypto.SUPPORTED_ENCRYPTION_VERSION
 
 /* Wrapper :: {
@@ -149,7 +142,7 @@ export const fromEncPayload = curry((password, payload) => {
   const wrapper = {
     password,
     payload: JSON.stringify(payload),
-    payload_checksum: Crypto ? Crypto.SHA256(JSON.stringify(payload), { asHex: true }) : undefined,
+    payload_checksum: crypto.sha256(JSON.stringify(payload)).toString('hex'),
     pbkdf2Iterations,
     version
   }