alternative without createKeyMaterialFromBuffer

Author: toger5

package.json

@@ -102,7 +102,7 @@
     "livekit-client": "^2.11.3",
     "lodash-es": "^4.17.21",
     "loglevel": "^1.9.1",
-    "matrix-js-sdk": "github:matrix-org/matrix-js-sdk#591bc1e794463aa78d41fc1fe075c4911e7d5d32",
+    "matrix-js-sdk": "github:matrix-org/matrix-js-sdk#f3f4a1f7e2f5f2c26cf4fce89a729a9197f619b5",
     "matrix-widget-api": "1.11.0",
     "normalize.css": "^8.0.1",
     "observable-hooks": "^4.2.3",

src/e2ee/matrixKeyProvider.ts

@@ -5,7 +5,7 @@ SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
 Please see LICENSE in the repository root for full details.
 */
 
-import { BaseKeyProvider, createKeyMaterialFromBuffer } from "livekit-client";
+import { BaseKeyProvider } from "livekit-client";
 import { logger } from "matrix-js-sdk/lib/logger";
 import {
   type MatrixRTCSession,
@@ -44,20 +44,29 @@ export class MatrixKeyProvider extends BaseKeyProvider {
     encryptionKeyIndex: number,
     participantId: string,
   ): void => {
-    createKeyMaterialFromBuffer(encryptionKey).then(
-      (keyMaterial) => {
-        this.onSetEncryptionKey(keyMaterial, participantId, encryptionKeyIndex);
-
-        logger.debug(
-          `Sent new key to livekit room=${this.rtcSession?.room.roomId} participantId=${participantId} encryptionKeyIndex=${encryptionKeyIndex}`,
-        );
-      },
-      (e) => {
-        logger.error(
-          `Failed to create key material from buffer for livekit room=${this.rtcSession?.room.roomId} participantId=${participantId} encryptionKeyIndex=${encryptionKeyIndex}`,
-          e,
-        );
-      },
-    );
+    crypto.subtle
+      .importKey("raw", encryptionKey, "HKDF", false, [
+        "deriveBits",
+        "deriveKey",
+      ])
+      .then(
+        (keyMaterial) => {
+          this.onSetEncryptionKey(
+            keyMaterial,
+            participantId,
+            encryptionKeyIndex,
+          );
+
+          logger.debug(
+            `Sent new key to livekit room=${this.rtcSession?.room.roomId} participantId=${participantId} encryptionKeyIndex=${encryptionKeyIndex}`,
+          );
+        },
+        (e) => {
+          logger.error(
+            `Failed to create key material from buffer for livekit room=${this.rtcSession?.room.roomId} participantId=${participantId} encryptionKeyIndex=${encryptionKeyIndex}`,
+            e,
+          );
+        },
+      );
   };
 }

yarn.lock

@@ -7007,7 +7007,7 @@ __metadata:
     livekit-client: "npm:^2.11.3"
     lodash-es: "npm:^4.17.21"
     loglevel: "npm:^1.9.1"
-    matrix-js-sdk: "github:matrix-org/matrix-js-sdk#591bc1e794463aa78d41fc1fe075c4911e7d5d32"
+    matrix-js-sdk: "github:matrix-org/matrix-js-sdk#f3f4a1f7e2f5f2c26cf4fce89a729a9197f619b5"
     matrix-widget-api: "npm:1.11.0"
     normalize.css: "npm:^8.0.1"
     observable-hooks: "npm:^4.2.3"
@@ -9610,9 +9610,9 @@ __metadata:
   languageName: node
   linkType: hard
 
-"matrix-js-sdk@github:matrix-org/matrix-js-sdk#591bc1e794463aa78d41fc1fe075c4911e7d5d32":
+"matrix-js-sdk@github:matrix-org/matrix-js-sdk#f3f4a1f7e2f5f2c26cf4fce89a729a9197f619b5":
   version: 37.5.0
-  resolution: "matrix-js-sdk@https://github.com/matrix-org/matrix-js-sdk.git#commit=591bc1e794463aa78d41fc1fe075c4911e7d5d32"
+  resolution: "matrix-js-sdk@https://github.com/matrix-org/matrix-js-sdk.git#commit=f3f4a1f7e2f5f2c26cf4fce89a729a9197f619b5"
   dependencies:
     "@babel/runtime": "npm:^7.12.5"
     "@matrix-org/matrix-sdk-crypto-wasm": "npm:^14.0.1"
@@ -9629,7 +9629,7 @@ __metadata:
     sdp-transform: "npm:^2.14.1"
     unhomoglyph: "npm:^1.0.6"
     uuid: "npm:11"
-  checksum: 10c0/50dbacf55bc9b0721c5b57c75088c37456ac71624dd2e9731aa964ac13f0b61dba0e805b0be8f355a891a644aae6a4f4b95eb435b22fb4d6cbda4e674a02d0cd
+  checksum: 10c0/14058044851110df967252ab9df0dcc480b2f60cedfb049edb51f8b8925d131f78b4ee9b974e5cdd39093fa32ce7e3318523059c82ecce290fa2fe03ed98506b
   languageName: node
   linkType: hard