1 files changed, 9 insertions, 4 deletions
diff --git a/packages/server/src/helpers/generateChallenge.ts b/packages/server/src/helpers/generateChallenge.ts
index 8277674..40b12a4 100644
--- a/packages/server/src/helpers/generateChallenge.ts
+++ b/packages/server/src/helpers/generateChallenge.ts
@@ -1,9 +1,9 @@
-import { isoCrypto } from './iso';
+import { isoCrypto } from './iso/index.ts';
 
 /**
  * Generate a suitably random value to be used as an attestation or assertion challenge
  */
-export function generateChallenge(): Uint8Array {
+export async function generateChallenge(): Promise<Uint8Array> {
   /**
    * WebAuthn spec says that 16 bytes is a good minimum:
    *
@@ -14,7 +14,12 @@ export function generateChallenge(): Uint8Array {
    */
   const challenge = new Uint8Array(32);
 
-  isoCrypto.getRandomValues(challenge);
+  await isoCrypto.getRandomValues(challenge);
 
-  return challenge;
+  return _generateChallengeInternals.stubThis(challenge);
 }
+
+// Make it possible to stub the return value during testing
+export const _generateChallengeInternals = {
+  stubThis: (value: Uint8Array) => value,
+};