2 files changed, 20 insertions, 22 deletions

diff --git a/packages/server/src/registration/verifyRegistrationResponse.test.ts b/packages/server/src/registration/verifyRegistrationResponse.test.ts
index fbe7aed..89b4694 100644
--- a/packages/server/src/registration/verifyRegistrationResponse.test.ts
+++ b/packages/server/src/registration/verifyRegistrationResponse.test.ts
@@ -88,10 +88,7 @@ Deno.test('should verify Packed (EC2) attestation', async () => {
   );
   assertEquals(
     verification.registrationInfo?.credentialID,
-    isoBase64URL.toBuffer(
-      'AYThY1csINY4JrbHyGmqTl1nL_F1zjAF3hSAIngz8kAcjugmAMNVvxZRwqpEH-bNHHAIv291OX5ko9eDf_5mu3U' +
-        'B2BvsScr2K-ppM4owOpGsqwg5tZglqqmxIm1Q',
-    ),
+    'AYThY1csINY4JrbHyGmqTl1nL_F1zjAF3hSAIngz8kAcjugmAMNVvxZRwqpEH-bNHHAIv291OX5ko9eDf_5mu3UB2BvsScr2K-ppM4owOpGsqwg5tZglqqmxIm1Q',
   );
 });
 
@@ -115,9 +112,7 @@ Deno.test('should verify Packed (X5C) attestation', async () => {
   );
   assertEquals(
     verification.registrationInfo?.credentialID,
-    isoBase64URL.toBuffer(
-      '4rrvMciHCkdLQ2HghazIp1sMc8TmV8W8RgoX-x8tqV_1AmlqWACqUK8mBGLandr-htduQKPzgb2yWxOFV56Tlg',
-    ),
+    '4rrvMciHCkdLQ2HghazIp1sMc8TmV8W8RgoX-x8tqV_1AmlqWACqUK8mBGLandr-htduQKPzgb2yWxOFV56Tlg',
   );
 });
 
@@ -140,9 +135,7 @@ Deno.test('should verify None attestation', async () => {
   );
   assertEquals(
     verification.registrationInfo?.credentialID,
-    isoBase64URL.toBuffer(
-      'AdKXJEch1aV5Wo7bj7qLHskVY4OoNaj9qu8TPdJ7kSAgUeRxWNngXlcNIGt4gexZGKVGcqZpqqWordXb_he1izY',
-    ),
+    'AdKXJEch1aV5Wo7bj7qLHskVY4OoNaj9qu8TPdJ7kSAgUeRxWNngXlcNIGt4gexZGKVGcqZpqqWordXb_he1izY',
   );
   assertEquals(
     verification.registrationInfo?.origin,
@@ -182,7 +175,7 @@ Deno.test('should verify None attestation w/RSA public key', async () => {
   );
   assertEquals(
     verification.registrationInfo?.credentialID,
-    isoBase64URL.toBuffer('kGXv4RJWLeXRw8Yf3T22K3Gq_GGeDv9OKYmAHLm0Ylo'),
+    'kGXv4RJWLeXRw8Yf3T22K3Gq_GGeDv9OKYmAHLm0Ylo',
   );
   assertEquals(
     verification.registrationInfo?.origin,
@@ -227,10 +220,10 @@ Deno.test('should throw when response type is not expected value', async () => {
         expectedChallenge: attestationNoneChallenge,
         expectedOrigin: 'https://dev.dontneeda.pw',
         expectedRPID: 'dev.dontneeda.pw',
-        expectedType: 'something.get'
+        expectedType: 'something.get',
       }),
     Error,
-   'registration response type',
+    'registration response type',
   );
 });
 
@@ -242,7 +235,7 @@ Deno.test('should throw when response type is not in list of expected types', as
         expectedChallenge: attestationNoneChallenge,
         expectedOrigin: 'https://dev.dontneeda.pw',
         expectedRPID: 'dev.dontneeda.pw',
-        expectedType: ['something.create', 'something.else.create']
+        expectedType: ['something.create', 'something.else.create'],
       }),
     Error,
     'registration response type',
@@ -301,7 +294,7 @@ Deno.test('should validate when attestation type is not webauthn.create and expe
     expectedChallenge: challenge,
     expectedOrigin: origin,
     expectedRPID: 'dev.dontneeda.pw',
-    expectedType: 'webauthn.goodtype'
+    expectedType: 'webauthn.goodtype',
   });
   assert(verification.verified);
 
@@ -600,7 +593,7 @@ Deno.test('should validate TPM RSA response (SHA256)', async () => {
   );
   assertEquals(
     verification.registrationInfo?.credentialID,
-    isoBase64URL.toBuffer('lGkWHPe88VpnNYgVBxzon_MRR9-gmgODveQ16uM_bPM'),
+    'lGkWHPe88VpnNYgVBxzon_MRR9-gmgODveQ16uM_bPM',
   );
   assertEquals(
     verification.registrationInfo?.origin,
@@ -642,7 +635,7 @@ Deno.test('should validate TPM RSA response (SHA1)', async () => {
   );
   assertEquals(
     verification.registrationInfo?.credentialID,
-    isoBase64URL.toBuffer('oELnad0f6-g2BtzEn_78iLNoubarlq0xFtOtAMXnflU'),
+    'oELnad0f6-g2BtzEn_78iLNoubarlq0xFtOtAMXnflU',
   );
   assertEquals(
     verification.registrationInfo?.origin,
@@ -684,7 +677,7 @@ Deno.test('should validate Android-Key response', async () => {
   );
   assertEquals(
     verification.registrationInfo?.credentialID,
-    isoBase64URL.toBuffer('PPa1spYTB680cQq5q6qBtFuPLLdG1FQ73EastkT8n0o'),
+    'PPa1spYTB680cQq5q6qBtFuPLLdG1FQ73EastkT8n0o',
   );
   assertEquals(
     verification.registrationInfo?.origin,
diff --git a/packages/server/src/registration/verifyRegistrationResponse.ts b/packages/server/src/registration/verifyRegistrationResponse.ts
index d2399e8..7851e20 100644
--- a/packages/server/src/registration/verifyRegistrationResponse.ts
+++ b/packages/server/src/registration/verifyRegistrationResponse.ts
@@ -1,4 +1,5 @@
 import type {
+  Base64URLString,
   COSEAlgorithmIdentifier,
   CredentialDeviceType,
   RegistrationResponseJSON,
@@ -95,11 +96,15 @@ export async function verifyRegistrationResponse(
   if (Array.isArray(expectedType)) {
     if (!expectedType.includes(type)) {
       const joinedExpectedType = expectedType.join(', ');
-      throw new Error(`Unexpected registration response type "${type}", expected one of: ${joinedExpectedType}`);
+      throw new Error(
+        `Unexpected registration response type "${type}", expected one of: ${joinedExpectedType}`,
+      );
     }
   } else if (expectedType) {
     if (type !== expectedType) {
-      throw new Error(`Unexpected registration response type "${type}", expected "${expectedType}"`);
+      throw new Error(
+        `Unexpected registration response type "${type}", expected "${expectedType}"`,
+      );
     }
   } else if (type !== 'webauthn.create') {
     throw new Error(`Unexpected registration response type: ${type}`);
@@ -280,7 +285,7 @@ export async function verifyRegistrationResponse(
       fmt,
       counter,
       aaguid: convertAAGUIDToString(aaguid),
-      credentialID,
+      credentialID: isoBase64URL.fromBuffer(credentialID),
       credentialPublicKey,
       credentialType,
       attestationObject,
@@ -328,7 +333,7 @@ export type VerifiedRegistrationResponse = {
     fmt: AttestationFormat;
     counter: number;
     aaguid: string;
-    credentialID: Uint8Array;
+    credentialID: Base64URLString;
     credentialPublicKey: Uint8Array;
     credentialType: 'public-key';
     attestationObject: Uint8Array;