1 files changed, 48 insertions, 0 deletions
diff --git a/app/scripts/lib/seed-phrase-verifier.js b/app/scripts/lib/seed-phrase-verifier.js
new file mode 100644
index 000000000..9cea22029
--- /dev/null
+++ b/app/scripts/lib/seed-phrase-verifier.js
@@ -0,0 +1,48 @@
+const KeyringController = require('eth-keyring-controller')
+
+const seedPhraseVerifier = {
+
+  // Verifies if the seed words can restore the accounts.
+  //
+  // The seed words can recreate the primary keyring and the accounts belonging to it.
+  // The created accounts in the primary keyring are always the same.
+  // The keyring always creates the accounts in the same sequence.
+  verifyAccounts (createdAccounts, seedWords) {
+
+    return new Promise((resolve, reject) => {
+
+      if (!createdAccounts || createdAccounts.length < 1) {
+        return reject(new Error('No created accounts defined.'))
+      }
+
+      const keyringController = new KeyringController({})
+      const Keyring = keyringController.getKeyringClassForType('HD Key Tree')
+      const opts = {
+        mnemonic: seedWords,
+        numberOfAccounts: createdAccounts.length,
+      }
+
+      const keyring = new Keyring(opts)
+      keyring.getAccounts()
+        .then((restoredAccounts) => {
+
+          log.debug('Created accounts: ' + JSON.stringify(createdAccounts))
+          log.debug('Restored accounts: ' + JSON.stringify(restoredAccounts))
+
+          if (restoredAccounts.length !== createdAccounts.length) {
+            // this should not happen...
+            return reject(new Error('Wrong number of accounts'))
+          }
+
+          for (let i = 0; i < restoredAccounts.length; i++) {
+            if (restoredAccounts[i].toLowerCase() !== createdAccounts[i].toLowerCase()) {
+              return reject(new Error('Not identical accounts! Original: ' + createdAccounts[i] + ', Restored: ' + restoredAccounts[i]))
+            }
+          }
+          return resolve()
+        })
+    })
+  },
+}
+
+module.exports = seedPhraseVerifier