fix(ext/crypto): handle idlValue not being present (#11685)

1 files changed, 7 insertions, 2 deletions

diff --git a/ext/crypto/00_crypto.js b/ext/crypto/00_crypto.js
index 4319f09ba..b341aabe7 100644
--- a/ext/crypto/00_crypto.js
+++ b/ext/crypto/00_crypto.js
@@ -88,6 +88,7 @@
   };
 
   // See https://www.w3.org/TR/WebCryptoAPI/#dfn-normalize-an-algorithm
+  // 18.4.4
   function normalizeAlgorithm(algorithm, op) {
     if (typeof algorithm == "string") {
       return normalizeAlgorithm({ name: algorithm }, op);
@@ -125,18 +126,22 @@
       return { name: algName };
     }
 
+    // 6.
     const normalizedAlgorithm = webidl.converters[desiredType](algorithm, {
       prefix: "Failed to normalize algorithm",
       context: "passed algorithm",
     });
+    // 7.
     normalizedAlgorithm.name = algName;
 
+    // 9.
     const dict = simpleAlgorithmDictionaries[desiredType];
+    // 10.
     for (const member in dict) {
       const idlType = dict[member];
       const idlValue = normalizedAlgorithm[member];
-
-      if (idlType === "BufferSource") {
+      // 3.
+      if (idlType === "BufferSource" && idlValue) {
         normalizedAlgorithm[member] = new Uint8Array(
           TypedArrayPrototypeSlice(
             (ArrayBufferIsView(idlValue) ? idlValue.buffer : idlValue),