unit tests verify signature

tests/authentication.test.js

@@ -0,0 +1,37 @@
+const { subtle } = require('node:crypto').webcrypto;
+const authentication = require('../src/authentication');
+
+describe('authentication module', () => {
+    describe('verifySignature', () => {
+        it('should return the public key if the signature is verified successfully', async () => {
+            const { publicKey, privateKey } = await crypto.subtle.generateKey(
+                {
+                    name: "Ed25519",
+                },
+                true,
+                ["sign", "verify"],
+            );
+            const exportedPubkey = await crypto.subtle.exportKey("spki", publicKey);
+            let exportedAsString = String.fromCharCode.apply(null, new Uint8Array(exportedPubkey));
+            let exportedAsBase64 = Buffer.from(exportedAsString, 'binary').toString('base64');
+            let pemKey = `-----BEGIN PUBLIC KEY-----\n${exportedAsBase64}\n-----END PUBLIC KEY-----`;
+            const publicKeys = [pemKey,];
+            const msg = 'test message';
+            const encoder = new TextEncoder();
+            const encodedData = encoder.encode(msg);
+            const signature = await crypto.subtle.sign(
+                {
+                    name: "Ed25519",
+                },
+                privateKey,
+                encodedData,
+            );
+            const result = await authentication.verifySignature(encodedData, signature, publicKeys);
+            expect(result).toBe(pemKey);
+
+            let fakeKey = `-----BEGIN PUBLIC KEY-----MCowBQYDK2VwAyEAmrBLT6lyiFh/eUticsIFNY6AkjXuQPqj0Qvb99pCJJk=-----END PUBLIC KEY-----`
+            const result2 = await authentication.verifySignature(encodedData, signature, [fakeKey,]);
+            expect(result2).toBe(null);
+        });
+    });
+});