test: add test for sign and recover

Author: pcarranzav

packages/hypergraph/test/messages/signed-update-message.test.ts

@@ -0,0 +1,40 @@
+import { secp256k1 } from '@noble/curves/secp256k1';
+import { randomBytes } from '@noble/hashes/utils';
+import { describe, expect, it } from 'vitest';
+import { recoverUpdateMessageSigner, signedUpdateMessage } from '../../src/messages/index.js';
+import { bytesToHex, hexToBytes } from '../../src/utils/index.js';
+
+describe('sign updates and recover key', () => {
+  it('creates a signed message from which you can recover a signing key', () => {
+    const accountId = bytesToHex(randomBytes(20));
+    const secretKey = bytesToHex(new Uint8Array(32).fill(1));
+    const signaturePrivateKeyBytes = secp256k1.utils.randomPrivateKey();
+    const signaturePrivateKey = bytesToHex(signaturePrivateKeyBytes);
+    const signaturePublicKey = bytesToHex(secp256k1.getPublicKey(signaturePrivateKeyBytes));
+    const spaceId = '0x1234';
+    const ephemeralId = bytesToHex(randomBytes(32));
+
+    const message = hexToBytes('0x01234abcdef01234');
+
+    const msg = signedUpdateMessage({
+      accountId,
+      ephemeralId,
+      spaceId,
+      message,
+      secretKey,
+      signaturePrivateKey,
+    });
+
+    // The signer should be recoverable without needing anything
+    // outside of what's included in the message
+    const recoveredSigner = recoverUpdateMessageSigner({
+      update: msg.update,
+      spaceId: msg.spaceId,
+      ephemeralId: msg.ephemeralId,
+      signature: msg.signature,
+      accountId: msg.accountId,
+    });
+
+    expect(recoveredSigner).to.eq(signaturePublicKey);
+  });
+});