Add support for encrypted second password hashes

src/function/dh/genkey.ts

@@ -0,0 +1,38 @@
+/*
+ * server component for the TimeLimit App
+ * Copyright (C) 2019 - 2022 Jonas Lochmann
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import { generateKeyPair } from 'crypto'
+import { promisify } from 'util'
+
+const generateKeyPairAsync = promisify(generateKeyPair)
+
+export async function generateDhKeypair() {
+  return await generateKeyPairAsync(
+    'ec',
+    {
+      namedCurve: 'prime256v1',
+      publicKeyEncoding: {
+        type: 'spki',
+        format: 'der'
+      },
+      privateKeyEncoding: {
+        type: 'pkcs8',
+        format: 'der'
+      }
+    }
+  )
+}