From 2d58cbcf1212d87e2f541fdeb57d825146e341af Mon Sep 17 00:00:00 2001
From: Filip Skokan <panva.ip@gmail.com>
Date: Thu, 17 Dec 2020 18:55:38 +0100
Subject: [PATCH] refactor: check general jws sign recipients length

---
 src/jws/general/sign.ts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/jws/general/sign.ts b/src/jws/general/sign.ts
index faeb8557..6e464680 100644
--- a/src/jws/general/sign.ts
+++ b/src/jws/general/sign.ts
@@ -141,6 +141,10 @@ export default class GeneralSign {
    * Signs and resolves the value of the General JWS object.
    */
   async sign(): Promise<GeneralJWS> {
+    if (!this._signatures.length) {
+      throw new JWSInvalid('at least one signature must be added')
+    }
+
     const jws: GeneralJWS = {
       signatures: [],
     }