Remove unused javascript (#2470)

src/client/secretStorageKeys.js

@@ -0,0 +1,37 @@
+const secretStorageKeys = new Map();
+
+export function storePrivateKey(keyId, privateKey) {
+  if (privateKey instanceof Uint8Array === false) {
+    throw new Error('Unable to store, privateKey is invalid.');
+  }
+  secretStorageKeys.set(keyId, privateKey);
+}
+
+function hasPrivateKey(keyId) {
+  return secretStorageKeys.get(keyId) instanceof Uint8Array;
+}
+
+function getPrivateKey(keyId) {
+  return secretStorageKeys.get(keyId);
+}
+
+export function clearSecretStorageKeys() {
+  secretStorageKeys.clear();
+}
+
+async function getSecretStorageKey({ keys }) {
+  const keyIds = Object.keys(keys);
+  const keyId = keyIds.find(hasPrivateKey);
+  if (!keyId) return undefined;
+  const privateKey = getPrivateKey(keyId);
+  return [keyId, privateKey];
+}
+
+function cacheSecretStorageKey(keyId, keyInfo, privateKey) {
+  secretStorageKeys.set(keyId, privateKey);
+}
+
+export const cryptoCallbacks = {
+  getSecretStorageKey,
+  cacheSecretStorageKey,
+};