stub out crypto function service with pbkdf2

src/services/nodeCryptoFunction.service.ts

@@ -0,0 +1,17 @@
+import * as crypto from 'crypto';
+
+import { CryptoFunctionService } from '../abstractions/cryptoFunction.service';
+
+export class NodeCryptoFunctionService implements CryptoFunctionService {
+    async pbkdf2(password: Buffer, salt: Buffer, iterations: number, length: number): Promise<ArrayBuffer> {
+        return new Promise<ArrayBuffer>((resolve, reject) => {
+            crypto.pbkdf2(password, salt, iterations, length, 'sha256', (error, key) => {
+                if (error != null) {
+                    reject(error);
+                } else {
+                    resolve(key.buffer);
+                }
+            });
+        });
+    }
+}