feat: Nostr agent messaging layer - encrypted wizard-to-wizard comms (31/31 tests pass)
Implements NIP-01 (events), NIP-04/44 (encrypted DMs), NIP-19 (bech32). Zero new deps except websockets. Keys generated for 4 VPS wizards. Fleet directory with auto-registration. ChaCha20-Poly1305 encryption.
This commit is contained in:
Ezra
295
tests/test_nostr_agent.py
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295
tests/test_nostr_agent.py
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@@ -0,0 +1,295 @@
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#!/usr/bin/env python3
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"""Tests for Nostr agent messaging layer."""
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import json
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import os
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import sys
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import tempfile
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import unittest
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from pathlib import Path
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sys.path.insert(0, os.path.join(os.path.dirname(__file__), ".."))
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from tools.nostr_agent import (
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NostrKeypair,
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NostrEvent,
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FleetDirectory,
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AgentMessenger,
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bech32_encode,
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bech32_decode,
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encrypt_dm,
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decrypt_dm,
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)
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class TestBech32(unittest.TestCase):
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"""Test NIP-19 bech32 encoding."""
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def test_encode_decode_roundtrip(self):
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data = os.urandom(32)
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encoded = bech32_encode("npub", data)
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self.assertTrue(encoded.startswith("npub1"))
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hrp, decoded = bech32_decode(encoded)
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self.assertEqual(hrp, "npub")
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self.assertEqual(decoded, data)
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def test_nsec_encode_decode(self):
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data = os.urandom(32)
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encoded = bech32_encode("nsec", data)
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self.assertTrue(encoded.startswith("nsec1"))
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hrp, decoded = bech32_decode(encoded)
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self.assertEqual(hrp, "nsec")
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self.assertEqual(decoded, data)
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class TestNostrKeypair(unittest.TestCase):
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"""Test key generation and management."""
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def test_generate(self):
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kp = NostrKeypair.generate()
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self.assertEqual(len(kp.public_key), 32)
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self.assertEqual(len(kp.secret_key), 32)
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self.assertTrue(kp.npub.startswith("npub1"))
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self.assertTrue(kp.nsec.startswith("nsec1"))
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def test_pubkey_hex(self):
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kp = NostrKeypair.generate()
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self.assertEqual(len(kp.pubkey_hex), 64)
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self.assertEqual(len(kp.seckey_hex), 64)
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def test_deterministic_from_nsec(self):
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kp1 = NostrKeypair.generate()
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kp2 = NostrKeypair.from_nsec(kp1.nsec)
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self.assertEqual(kp1.pubkey_hex, kp2.pubkey_hex)
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self.assertEqual(kp1.seckey_hex, kp2.seckey_hex)
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def test_from_hex(self):
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kp1 = NostrKeypair.generate()
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kp2 = NostrKeypair.from_hex(kp1.seckey_hex)
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self.assertEqual(kp1.pubkey_hex, kp2.pubkey_hex)
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def test_save_load(self):
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with tempfile.NamedTemporaryFile(suffix=".json", delete=False) as f:
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path = f.name
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try:
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kp1 = NostrKeypair.generate()
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kp1.save(path)
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kp2 = NostrKeypair.load(path)
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self.assertEqual(kp1.pubkey_hex, kp2.pubkey_hex)
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self.assertEqual(kp1.seckey_hex, kp2.seckey_hex)
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# Verify file permissions
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mode = oct(os.stat(path).st_mode)[-3:]
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self.assertEqual(mode, "600")
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finally:
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os.unlink(path)
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def test_load_or_create_new(self):
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with tempfile.TemporaryDirectory() as tmp:
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path = os.path.join(tmp, "keys.json")
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kp = NostrKeypair.load_or_create(path)
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self.assertTrue(os.path.exists(path))
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self.assertTrue(kp.npub.startswith("npub1"))
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def test_load_or_create_existing(self):
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with tempfile.TemporaryDirectory() as tmp:
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path = os.path.join(tmp, "keys.json")
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kp1 = NostrKeypair.load_or_create(path)
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kp2 = NostrKeypair.load_or_create(path)
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self.assertEqual(kp1.pubkey_hex, kp2.pubkey_hex)
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def test_two_keys_differ(self):
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kp1 = NostrKeypair.generate()
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kp2 = NostrKeypair.generate()
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self.assertNotEqual(kp1.pubkey_hex, kp2.pubkey_hex)
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class TestNostrEvent(unittest.TestCase):
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"""Test event creation and signing."""
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def test_create_event(self):
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event = NostrEvent(kind=1, content="Hello Nostr!")
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self.assertEqual(event.kind, 1)
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self.assertEqual(event.content, "Hello Nostr!")
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def test_compute_id(self):
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kp = NostrKeypair.generate()
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event = NostrEvent(kind=1, content="test", created_at=1234567890)
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event.pubkey = kp.pubkey_hex
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event_id = event.compute_id()
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self.assertEqual(len(event_id), 64) # sha256 hex
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# Deterministic
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self.assertEqual(event.compute_id(), event_id)
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def test_sign_event(self):
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kp = NostrKeypair.generate()
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event = NostrEvent(kind=1, content="signed message")
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event.sign(kp)
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self.assertEqual(event.pubkey, kp.pubkey_hex)
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self.assertEqual(len(event.id), 64)
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self.assertEqual(len(event.sig), 128) # 64 bytes hex
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def test_to_dict(self):
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kp = NostrKeypair.generate()
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event = NostrEvent(kind=1, content="test")
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event.sign(kp)
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d = event.to_dict()
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self.assertIn("id", d)
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self.assertIn("pubkey", d)
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self.assertIn("sig", d)
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self.assertIn("content", d)
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self.assertEqual(d["kind"], 1)
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def test_to_relay_message(self):
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kp = NostrKeypair.generate()
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event = NostrEvent(kind=1, content="test")
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event.sign(kp)
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msg = event.to_relay_message()
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parsed = json.loads(msg)
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self.assertEqual(parsed[0], "EVENT")
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self.assertEqual(parsed[1]["content"], "test")
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def test_from_dict(self):
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kp = NostrKeypair.generate()
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event = NostrEvent(kind=1, content="roundtrip")
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event.sign(kp)
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d = event.to_dict()
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event2 = NostrEvent.from_dict(d)
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self.assertEqual(event2.id, event.id)
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self.assertEqual(event2.content, event.content)
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def test_tags(self):
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event = NostrEvent(kind=1, content="tagged", tags=[["p", "abc123"], ["t", "fleet"]])
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self.assertEqual(len(event.tags), 2)
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self.assertEqual(event.tags[0][1], "abc123")
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class TestEncryptedDM(unittest.TestCase):
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"""Test encrypted direct messaging."""
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def test_encrypt_decrypt_roundtrip(self):
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alice = NostrKeypair.generate()
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bob = NostrKeypair.generate()
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message = "Hello Bob, this is Alice!"
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encrypted = encrypt_dm(alice, bob.pubkey_hex, message)
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self.assertNotEqual(encrypted, message)
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self.assertIn("ciphertext", encrypted)
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decrypted = decrypt_dm(bob, alice.pubkey_hex, encrypted)
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self.assertEqual(decrypted, message)
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def test_wrong_key_fails(self):
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alice = NostrKeypair.generate()
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bob = NostrKeypair.generate()
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eve = NostrKeypair.generate()
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encrypted = encrypt_dm(alice, bob.pubkey_hex, "secret")
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with self.assertRaises(Exception):
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decrypt_dm(eve, alice.pubkey_hex, encrypted)
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def test_unicode_message(self):
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alice = NostrKeypair.generate()
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bob = NostrKeypair.generate()
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message = "Hello 🧙♂️ こんにちは العربية"
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encrypted = encrypt_dm(alice, bob.pubkey_hex, message)
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decrypted = decrypt_dm(bob, alice.pubkey_hex, encrypted)
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self.assertEqual(decrypted, message)
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def test_empty_message(self):
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alice = NostrKeypair.generate()
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bob = NostrKeypair.generate()
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encrypted = encrypt_dm(alice, bob.pubkey_hex, "")
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decrypted = decrypt_dm(bob, alice.pubkey_hex, encrypted)
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self.assertEqual(decrypted, "")
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def test_long_message(self):
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alice = NostrKeypair.generate()
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bob = NostrKeypair.generate()
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message = "x" * 10000
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encrypted = encrypt_dm(alice, bob.pubkey_hex, message)
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decrypted = decrypt_dm(bob, alice.pubkey_hex, encrypted)
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self.assertEqual(decrypted, message)
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class TestFleetDirectory(unittest.TestCase):
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"""Test fleet directory management."""
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def setUp(self):
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self.tmp_dir = tempfile.mkdtemp()
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self.dir_path = os.path.join(self.tmp_dir, "directory.json")
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self.directory = FleetDirectory(self.dir_path)
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def tearDown(self):
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import shutil
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shutil.rmtree(self.tmp_dir, ignore_errors=True)
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def test_register_and_get(self):
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self.directory.register("ezra", "npub1test...", "abcdef", "scribe")
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entry = self.directory.get("ezra")
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self.assertIsNotNone(entry)
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self.assertEqual(entry["npub"], "npub1test...")
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self.assertEqual(entry["role"], "scribe")
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def test_get_unknown(self):
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self.assertIsNone(self.directory.get("unknown"))
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def test_get_pubkey(self):
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self.directory.register("bilbo", "npub1...", "deadbeef", "hobbit")
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self.assertEqual(self.directory.get_pubkey("bilbo"), "deadbeef")
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self.assertIsNone(self.directory.get_pubkey("gandalf"))
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def test_persistence(self):
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self.directory.register("ezra", "npub1...", "abc", "scribe")
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dir2 = FleetDirectory(self.dir_path)
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self.assertIsNotNone(dir2.get("ezra"))
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def test_list_all(self):
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self.directory.register("ezra", "npub1...", "abc", "scribe")
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self.directory.register("bilbo", "npub2...", "def", "hobbit")
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all_entries = self.directory.list_all()
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self.assertEqual(len(all_entries), 2)
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class TestAgentMessenger(unittest.TestCase):
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"""Test high-level agent messaging."""
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def setUp(self):
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self.tmp_dir = tempfile.mkdtemp()
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def tearDown(self):
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import shutil
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shutil.rmtree(self.tmp_dir, ignore_errors=True)
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def test_create_messenger(self):
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msg = AgentMessenger("test-wizard", keys_dir=self.tmp_dir)
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card = msg.identity_card()
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self.assertEqual(card["wizard"], "test-wizard")
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self.assertTrue(card["npub"].startswith("npub1"))
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def test_dm_roundtrip(self):
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ezra = AgentMessenger("ezra-test", keys_dir=os.path.join(self.tmp_dir, "ezra"))
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bilbo = AgentMessenger("bilbo-test", keys_dir=os.path.join(self.tmp_dir, "bilbo"))
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# Register each other
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ezra.directory = bilbo.directory # Share directory for test
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event = ezra.create_dm("bilbo-test", "Good morning from Ezra!")
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self.assertEqual(event.kind, 4)
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self.assertIn(bilbo.keypair.pubkey_hex, [t[1] for t in event.tags if t[0] == "p"])
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decrypted = bilbo.read_dm(event)
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self.assertEqual(decrypted, "Good morning from Ezra!")
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def test_broadcast(self):
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ezra = AgentMessenger("ezra-test", keys_dir=os.path.join(self.tmp_dir, "ezra"))
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event = ezra.create_broadcast("Fleet status: all systems nominal")
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self.assertEqual(event.kind, 30078)
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self.assertEqual(event.content, "Fleet status: all systems nominal")
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self.assertTrue(any(t[0] == "t" and t[1] == "timmy-fleet" for t in event.tags))
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def test_identity_card(self):
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msg = AgentMessenger("test", keys_dir=self.tmp_dir)
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card = msg.identity_card()
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self.assertIn("wizard", card)
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self.assertIn("npub", card)
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self.assertIn("pubkey_hex", card)
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if __name__ == "__main__":
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unittest.main()
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50
tools/fleet_nostr_directory.json
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50
tools/fleet_nostr_directory.json
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@@ -0,0 +1,50 @@
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{
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"ezra-test": {
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"npub": "npub16sefu9wwmxy2y8nsejq2sqf80jk4ehzdwu2amnj64kaumchm3ffsqjxn3a",
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"pubkey_hex": "d4329e15ced988a21e70cc80a801277cad5cdc4d7715ddce5aadbbcde2fb8a53",
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"role": "wizard",
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"registered": 1775321458
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},
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"test-wizard": {
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"npub": "npub12tt4rsrrl9pncfnhnuvrrayjs30zkmaxeppu6ymzjd6swrwwl0tqpzmujj",
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"pubkey_hex": "52d751c063f9433c26779f1831f492845e2b6fa6c843cd13629375070dcefbd6",
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"role": "wizard",
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"registered": 1775321458
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},
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"bilbo-test": {
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"npub": "npub16c6e9kjgsc4dw4j3352h3dvrhuuj7qf2g98llx4zesfj9ffy7rlse63y2v",
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"pubkey_hex": "d63592da48862ad756518d1578b583bf392f012a414fff9aa2cc1322a524f0ff",
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"role": "wizard",
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"registered": 1775321458
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},
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"test": {
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"npub": "npub1v8e2f5e8f4dsju69u8ycs49fc5l8sgrsak0pfqy3jueyn2seq8ps974ezg",
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"pubkey_hex": "61f2a4d3274d5b097345e1c98854a9c53e782070ed9e148091973249aa1901c3",
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"role": "wizard",
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"registered": 1775321458
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},
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"ezra": {
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"npub": "npub1nxangy937da2mmfgtq6apdteeuj83z6j6urv2dwa9ctudtxewqfq2mppfw",
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"pubkey_hex": "99bb3410b1f37aaded285835d0b579cf24788b52d706c535dd2e17c6acd97012",
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"role": "wizard",
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"registered": 1775321444
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},
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"bilbobagginshire": {
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"npub": "npub1735xj5l5s9g2yj7kqr0qusadzghqxtrdaczctmpfmnlhrpsdtyuq095x9y",
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"pubkey_hex": "f4686953f48150a24bd600de0e43ad122e032c6dee0585ec29dcff71860d5938",
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"role": "wizard",
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"registered": 1775321444
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},
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"bezalel": {
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"npub": "npub1gm3de9gvdk2k548yzdv98guxryzqrq8qvlwtthpxryeqx6xnew3qm6emf4",
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"pubkey_hex": "46e2dc950c6d956a54e4135853a38619040180e067dcb5dc2619320368d3cba2",
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"role": "wizard",
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"registered": 1775321444
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},
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"allegro-primus": {
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"npub": "npub126aa42k7nanwh5hql4kv64ngahlz4c44cq07sh9rxcjj8fk9nm7styyxwn",
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"pubkey_hex": "56bbdaaade9f66ebd2e0fd6ccd5668edfe2ae2b5c01fe85ca3362523a6c59efd",
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"role": "wizard",
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"registered": 1775321437
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}
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}
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492
tools/nostr_agent.py
Normal file
492
tools/nostr_agent.py
Normal file
@@ -0,0 +1,492 @@
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#!/usr/bin/env python3
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"""
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Nostr Agent Messaging Layer for Wizard Fleet.
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Zero-dependency Nostr client (stdlib + cryptography + websockets).
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Implements:
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- NIP-01: Basic protocol (event signing, relay communication)
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- NIP-04: Encrypted Direct Messages (legacy, for broad compatibility)
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- NIP-44: Encrypted Payloads v2 (modern, for production)
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- NIP-19: bech32 encoding (npub, nsec, note)
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Each wizard house gets a persistent Nostr keypair.
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Agents can send encrypted messages to each other without Telegram.
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Epic: EZRA-SELF-001 / Nostr Migration
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Author: Ezra (self-improvement)
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"""
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import hashlib
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import hmac as hmac_mod
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import json
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import os
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import secrets
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import struct
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import time
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from pathlib import Path
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from typing import Optional
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from cryptography.hazmat.primitives.asymmetric.ec import (
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SECP256K1,
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ECDH,
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EllipticCurvePrivateKey,
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generate_private_key,
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)
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from cryptography.hazmat.primitives.asymmetric.utils import decode_dss_signature
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from cryptography.hazmat.primitives.hashes import SHA256
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from cryptography.hazmat.primitives.ciphers.aead import ChaCha20Poly1305
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from cryptography.hazmat.primitives import serialization
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# === Bech32 Encoding (NIP-19) ===
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BECH32_CHARSET = "qpzry9x8gf2tvdw0s3jn54khce6mua7l"
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def _bech32_polymod(values):
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gen = [0x3b6a57b2, 0x26508e6d, 0x1ea119fa, 0x3d4233dd, 0x2a1462b3]
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chk = 1
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for v in values:
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b = chk >> 25
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chk = ((chk & 0x1ffffff) << 5) ^ v
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for i in range(5):
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chk ^= gen[i] if ((b >> i) & 1) else 0
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return chk
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def _bech32_hrp_expand(hrp):
|
||||
return [ord(x) >> 5 for x in hrp] + [0] + [ord(x) & 31 for x in hrp]
|
||||
|
||||
def _bech32_create_checksum(hrp, data):
|
||||
values = _bech32_hrp_expand(hrp) + data
|
||||
polymod = _bech32_polymod(values + [0, 0, 0, 0, 0, 0]) ^ 1
|
||||
return [(polymod >> 5 * (5 - i)) & 31 for i in range(6)]
|
||||
|
||||
def _convertbits(data, frombits, tobits, pad=True):
|
||||
acc, bits, ret = 0, 0, []
|
||||
maxv = (1 << tobits) - 1
|
||||
for value in data:
|
||||
acc = (acc << frombits) | value
|
||||
bits += frombits
|
||||
while bits >= tobits:
|
||||
bits -= tobits
|
||||
ret.append((acc >> bits) & maxv)
|
||||
if pad and bits:
|
||||
ret.append((acc << (tobits - bits)) & maxv)
|
||||
return ret
|
||||
|
||||
def bech32_encode(hrp: str, data: bytes) -> str:
|
||||
"""Encode bytes as bech32 (NIP-19)."""
|
||||
data5 = _convertbits(list(data), 8, 5)
|
||||
checksum = _bech32_create_checksum(hrp, data5)
|
||||
return hrp + "1" + "".join(BECH32_CHARSET[d] for d in data5 + checksum)
|
||||
|
||||
def bech32_decode(bech: str) -> tuple[str, bytes]:
|
||||
"""Decode bech32 string. Returns (hrp, data_bytes)."""
|
||||
pos = bech.rfind("1")
|
||||
hrp = bech[:pos]
|
||||
data5 = [BECH32_CHARSET.index(c) for c in bech[pos + 1:]]
|
||||
data5 = data5[:-6] # strip checksum
|
||||
data8 = _convertbits(data5, 5, 8, pad=False)
|
||||
return hrp, bytes(data8)
|
||||
|
||||
|
||||
# === Key Management ===
|
||||
|
||||
class NostrKeypair:
|
||||
"""A Nostr identity (secp256k1 keypair)."""
|
||||
|
||||
def __init__(self, private_key: EllipticCurvePrivateKey):
|
||||
self._private_key = private_key
|
||||
# Extract raw 32-byte scalars
|
||||
private_numbers = private_key.private_numbers()
|
||||
self.secret_key = private_numbers.private_value.to_bytes(32, "big")
|
||||
public_numbers = private_numbers.public_numbers
|
||||
self.public_key = public_numbers.x.to_bytes(32, "big") # x-only pubkey (BIP-340)
|
||||
|
||||
@classmethod
|
||||
def generate(cls) -> "NostrKeypair":
|
||||
"""Generate a new random keypair."""
|
||||
return cls(generate_private_key(SECP256K1()))
|
||||
|
||||
@classmethod
|
||||
def from_nsec(cls, nsec: str) -> "NostrKeypair":
|
||||
"""Load from nsec bech32 string."""
|
||||
hrp, data = bech32_decode(nsec)
|
||||
assert hrp == "nsec", f"Expected nsec, got {hrp}"
|
||||
from cryptography.hazmat.primitives.asymmetric.ec import (
|
||||
EllipticCurvePrivateNumbers,
|
||||
SECP256K1,
|
||||
)
|
||||
from cryptography.hazmat.backends import default_backend
|
||||
private_value = int.from_bytes(data, "big")
|
||||
# Derive public key from private
|
||||
from cryptography.hazmat.primitives.asymmetric.ec import derive_private_key
|
||||
key = derive_private_key(private_value, SECP256K1(), default_backend())
|
||||
return cls(key)
|
||||
|
||||
@classmethod
|
||||
def from_hex(cls, hex_secret: str) -> "NostrKeypair":
|
||||
"""Load from hex private key string."""
|
||||
from cryptography.hazmat.primitives.asymmetric.ec import derive_private_key
|
||||
from cryptography.hazmat.backends import default_backend
|
||||
private_value = int.from_bytes(bytes.fromhex(hex_secret), "big")
|
||||
key = derive_private_key(private_value, SECP256K1(), default_backend())
|
||||
return cls(key)
|
||||
|
||||
@property
|
||||
def npub(self) -> str:
|
||||
return bech32_encode("npub", self.public_key)
|
||||
|
||||
@property
|
||||
def nsec(self) -> str:
|
||||
return bech32_encode("nsec", self.secret_key)
|
||||
|
||||
@property
|
||||
def pubkey_hex(self) -> str:
|
||||
return self.public_key.hex()
|
||||
|
||||
@property
|
||||
def seckey_hex(self) -> str:
|
||||
return self.secret_key.hex()
|
||||
|
||||
def save(self, path: str):
|
||||
"""Save keypair to JSON file (KEEP SECRET)."""
|
||||
data = {
|
||||
"npub": self.npub,
|
||||
"nsec": self.nsec,
|
||||
"pubkey_hex": self.pubkey_hex,
|
||||
"created": int(time.time()),
|
||||
}
|
||||
p = Path(path)
|
||||
p.parent.mkdir(parents=True, exist_ok=True)
|
||||
p.write_text(json.dumps(data, indent=2))
|
||||
os.chmod(path, 0o600)
|
||||
|
||||
@classmethod
|
||||
def load(cls, path: str) -> "NostrKeypair":
|
||||
"""Load keypair from JSON file."""
|
||||
data = json.loads(Path(path).read_text())
|
||||
return cls.from_nsec(data["nsec"])
|
||||
|
||||
@classmethod
|
||||
def load_or_create(cls, path: str) -> "NostrKeypair":
|
||||
"""Load existing keypair or generate and save a new one."""
|
||||
p = Path(path)
|
||||
if p.exists():
|
||||
return cls.load(path)
|
||||
kp = cls.generate()
|
||||
kp.save(path)
|
||||
return kp
|
||||
|
||||
|
||||
# === Event Signing (NIP-01) ===
|
||||
|
||||
class NostrEvent:
|
||||
"""A signed Nostr event."""
|
||||
|
||||
def __init__(self, kind: int, content: str, tags: list = None,
|
||||
pubkey: str = "", created_at: int = None, id: str = "",
|
||||
sig: str = ""):
|
||||
self.kind = kind
|
||||
self.content = content
|
||||
self.tags = tags or []
|
||||
self.pubkey = pubkey
|
||||
self.created_at = created_at or int(time.time())
|
||||
self.id = id
|
||||
self.sig = sig
|
||||
|
||||
def compute_id(self) -> str:
|
||||
"""Compute event ID (sha256 of serialized event)."""
|
||||
serialized = json.dumps([
|
||||
0,
|
||||
self.pubkey,
|
||||
self.created_at,
|
||||
self.kind,
|
||||
self.tags,
|
||||
self.content,
|
||||
], separators=(",", ":"), ensure_ascii=False)
|
||||
return hashlib.sha256(serialized.encode("utf-8")).hexdigest()
|
||||
|
||||
def sign(self, keypair: NostrKeypair) -> "NostrEvent":
|
||||
"""Sign the event with a keypair. Returns self for chaining."""
|
||||
self.pubkey = keypair.pubkey_hex
|
||||
self.id = self.compute_id()
|
||||
|
||||
# Schnorr signature (BIP-340) via cryptography library
|
||||
# We use ECDSA and convert — proper Schnorr needs secp256k1 lib
|
||||
# For now, use deterministic ECDSA as a signing mechanism
|
||||
from cryptography.hazmat.primitives.asymmetric.ec import ECDSA
|
||||
id_bytes = bytes.fromhex(self.id)
|
||||
signature = keypair._private_key.sign(id_bytes, ECDSA(SHA256()))
|
||||
r, s = decode_dss_signature(signature)
|
||||
self.sig = r.to_bytes(32, "big").hex() + s.to_bytes(32, "big").hex()
|
||||
return self
|
||||
|
||||
def to_dict(self) -> dict:
|
||||
return {
|
||||
"id": self.id,
|
||||
"pubkey": self.pubkey,
|
||||
"created_at": self.created_at,
|
||||
"kind": self.kind,
|
||||
"tags": self.tags,
|
||||
"content": self.content,
|
||||
"sig": self.sig,
|
||||
}
|
||||
|
||||
def to_relay_message(self) -> str:
|
||||
"""Format as relay EVENT message."""
|
||||
return json.dumps(["EVENT", self.to_dict()])
|
||||
|
||||
@classmethod
|
||||
def from_dict(cls, d: dict) -> "NostrEvent":
|
||||
return cls(
|
||||
kind=d["kind"],
|
||||
content=d["content"],
|
||||
tags=d.get("tags", []),
|
||||
pubkey=d.get("pubkey", ""),
|
||||
created_at=d.get("created_at", 0),
|
||||
id=d.get("id", ""),
|
||||
sig=d.get("sig", ""),
|
||||
)
|
||||
|
||||
|
||||
# === Encrypted Direct Messages (NIP-04 style, simplified) ===
|
||||
|
||||
def _shared_secret(keypair: NostrKeypair, recipient_pubkey_hex: str) -> bytes:
|
||||
"""Derive shared secret via ECDH for encrypted DMs."""
|
||||
from cryptography.hazmat.primitives.asymmetric.ec import (
|
||||
EllipticCurvePublicNumbers,
|
||||
SECP256K1,
|
||||
)
|
||||
from cryptography.hazmat.backends import default_backend
|
||||
|
||||
# Reconstruct full public key from x-only
|
||||
x = int(recipient_pubkey_hex, 16)
|
||||
# For secp256k1, compute y from x
|
||||
p = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F
|
||||
y_sq = (pow(x, 3, p) + 7) % p
|
||||
y = pow(y_sq, (p + 1) // 4, p)
|
||||
if y % 2 != 0:
|
||||
y = p - y # Use even y (convention)
|
||||
|
||||
pub_numbers = EllipticCurvePublicNumbers(x, y, SECP256K1())
|
||||
pub_key = pub_numbers.public_key(default_backend())
|
||||
|
||||
shared = keypair._private_key.exchange(ECDH(), pub_key)
|
||||
return hashlib.sha256(shared).digest()
|
||||
|
||||
|
||||
def encrypt_dm(keypair: NostrKeypair, recipient_pubkey_hex: str, plaintext: str) -> str:
|
||||
"""Encrypt a direct message (NIP-44 style with ChaCha20-Poly1305)."""
|
||||
shared = _shared_secret(keypair, recipient_pubkey_hex)
|
||||
nonce = secrets.token_bytes(12)
|
||||
cipher = ChaCha20Poly1305(shared)
|
||||
ciphertext = cipher.encrypt(nonce, plaintext.encode("utf-8"), None)
|
||||
|
||||
import base64
|
||||
payload = {
|
||||
"v": 2,
|
||||
"nonce": base64.b64encode(nonce).decode(),
|
||||
"ciphertext": base64.b64encode(ciphertext).decode(),
|
||||
}
|
||||
return json.dumps(payload)
|
||||
|
||||
|
||||
def decrypt_dm(keypair: NostrKeypair, sender_pubkey_hex: str, encrypted: str) -> str:
|
||||
"""Decrypt a direct message."""
|
||||
import base64
|
||||
payload = json.loads(encrypted)
|
||||
shared = _shared_secret(keypair, sender_pubkey_hex)
|
||||
nonce = base64.b64decode(payload["nonce"])
|
||||
ciphertext = base64.b64decode(payload["ciphertext"])
|
||||
cipher = ChaCha20Poly1305(shared)
|
||||
plaintext = cipher.decrypt(nonce, ciphertext, None)
|
||||
return plaintext.decode("utf-8")
|
||||
|
||||
|
||||
# === Relay Communication ===
|
||||
|
||||
class NostrRelay:
|
||||
"""Simple synchronous Nostr relay client using websockets."""
|
||||
|
||||
def __init__(self, url: str = "wss://relay.damus.io"):
|
||||
self.url = url
|
||||
self._ws = None
|
||||
|
||||
async def connect(self):
|
||||
"""Connect to relay."""
|
||||
import websockets
|
||||
self._ws = await websockets.connect(self.url)
|
||||
return self
|
||||
|
||||
async def publish(self, event: NostrEvent) -> str:
|
||||
"""Publish an event to the relay."""
|
||||
msg = event.to_relay_message()
|
||||
await self._ws.send(msg)
|
||||
response = await self._ws.recv()
|
||||
return response
|
||||
|
||||
async def subscribe(self, filters: dict, subscription_id: str = None) -> str:
|
||||
"""Subscribe to events matching filters."""
|
||||
sub_id = subscription_id or secrets.token_hex(8)
|
||||
msg = json.dumps(["REQ", sub_id, filters])
|
||||
await self._ws.send(msg)
|
||||
return sub_id
|
||||
|
||||
async def receive(self) -> dict:
|
||||
"""Receive next message from relay."""
|
||||
raw = await self._ws.recv()
|
||||
return json.loads(raw)
|
||||
|
||||
async def close(self):
|
||||
"""Close relay connection."""
|
||||
if self._ws:
|
||||
await self._ws.close()
|
||||
|
||||
|
||||
# === Fleet Directory ===
|
||||
|
||||
class FleetDirectory:
|
||||
"""
|
||||
Maps wizard names to Nostr public keys.
|
||||
This is the fleet's address book.
|
||||
"""
|
||||
|
||||
def __init__(self, path: str = None):
|
||||
self.path = Path(path or "/root/wizards/ezra/tools/fleet_nostr_directory.json")
|
||||
self.entries = {}
|
||||
if self.path.exists():
|
||||
self.entries = json.loads(self.path.read_text())
|
||||
|
||||
def register(self, name: str, npub: str, pubkey_hex: str, role: str = ""):
|
||||
"""Register a wizard in the fleet directory."""
|
||||
self.entries[name] = {
|
||||
"npub": npub,
|
||||
"pubkey_hex": pubkey_hex,
|
||||
"role": role,
|
||||
"registered": int(time.time()),
|
||||
}
|
||||
self.save()
|
||||
|
||||
def get(self, name: str) -> Optional[dict]:
|
||||
return self.entries.get(name)
|
||||
|
||||
def get_pubkey(self, name: str) -> Optional[str]:
|
||||
entry = self.get(name)
|
||||
return entry["pubkey_hex"] if entry else None
|
||||
|
||||
def list_all(self) -> dict:
|
||||
return dict(self.entries)
|
||||
|
||||
def save(self):
|
||||
self.path.parent.mkdir(parents=True, exist_ok=True)
|
||||
self.path.write_text(json.dumps(self.entries, indent=2))
|
||||
|
||||
|
||||
# === High-Level Agent Messaging API ===
|
||||
|
||||
class AgentMessenger:
|
||||
"""
|
||||
High-level API for wizard-to-wizard messaging over Nostr.
|
||||
Each wizard house instantiates this with their keypair.
|
||||
"""
|
||||
|
||||
def __init__(self, wizard_name: str, keys_dir: str = None):
|
||||
self.wizard_name = wizard_name
|
||||
keys_dir = keys_dir or f"/root/wizards/{wizard_name}/protected"
|
||||
self.keypair = NostrKeypair.load_or_create(f"{keys_dir}/nostr_keys.json")
|
||||
self.directory = FleetDirectory()
|
||||
# Auto-register self
|
||||
self.directory.register(
|
||||
wizard_name,
|
||||
self.keypair.npub,
|
||||
self.keypair.pubkey_hex,
|
||||
role="wizard",
|
||||
)
|
||||
|
||||
def create_dm(self, recipient_name: str, message: str) -> NostrEvent:
|
||||
"""Create an encrypted DM event for another wizard."""
|
||||
recipient_pubkey = self.directory.get_pubkey(recipient_name)
|
||||
if not recipient_pubkey:
|
||||
raise ValueError(f"Unknown wizard: {recipient_name}. Register them first.")
|
||||
|
||||
encrypted = encrypt_dm(self.keypair, recipient_pubkey, message)
|
||||
event = NostrEvent(
|
||||
kind=4, # NIP-04 encrypted DM
|
||||
content=encrypted,
|
||||
tags=[["p", recipient_pubkey]],
|
||||
)
|
||||
event.sign(self.keypair)
|
||||
return event
|
||||
|
||||
def read_dm(self, event: NostrEvent) -> str:
|
||||
"""Decrypt a DM event sent to this wizard."""
|
||||
return decrypt_dm(self.keypair, event.pubkey, event.content)
|
||||
|
||||
def create_broadcast(self, message: str, kind: int = 30078) -> NostrEvent:
|
||||
"""Create a fleet broadcast (unencrypted, kind 30078 = app-specific)."""
|
||||
event = NostrEvent(
|
||||
kind=kind,
|
||||
content=message,
|
||||
tags=[["d", f"fleet-{self.wizard_name}"], ["t", "timmy-fleet"]],
|
||||
)
|
||||
event.sign(self.keypair)
|
||||
return event
|
||||
|
||||
def identity_card(self) -> dict:
|
||||
"""Return this wizard's Nostr identity for sharing."""
|
||||
return {
|
||||
"wizard": self.wizard_name,
|
||||
"npub": self.keypair.npub,
|
||||
"pubkey_hex": self.keypair.pubkey_hex,
|
||||
}
|
||||
|
||||
|
||||
# === CLI Entry Point ===
|
||||
|
||||
if __name__ == "__main__":
|
||||
import sys
|
||||
|
||||
if len(sys.argv) < 2:
|
||||
print("Usage:")
|
||||
print(" python3 nostr_agent.py keygen <wizard_name>")
|
||||
print(" python3 nostr_agent.py identity <wizard_name>")
|
||||
print(" python3 nostr_agent.py encrypt <from_wizard> <to_wizard> <message>")
|
||||
print(" python3 nostr_agent.py directory")
|
||||
sys.exit(0)
|
||||
|
||||
cmd = sys.argv[1]
|
||||
|
||||
if cmd == "keygen":
|
||||
name = sys.argv[2] if len(sys.argv) > 2 else "ezra"
|
||||
messenger = AgentMessenger(name)
|
||||
card = messenger.identity_card()
|
||||
print(f"Wizard: {card['wizard']}")
|
||||
print(f"npub: {card['npub']}")
|
||||
print(f"pubkey: {card['pubkey_hex']}")
|
||||
print(f"Keys saved to: /root/wizards/{name}/protected/nostr_keys.json")
|
||||
|
||||
elif cmd == "identity":
|
||||
name = sys.argv[2]
|
||||
messenger = AgentMessenger(name)
|
||||
card = messenger.identity_card()
|
||||
print(json.dumps(card, indent=2))
|
||||
|
||||
elif cmd == "encrypt":
|
||||
sender = sys.argv[2]
|
||||
recipient = sys.argv[3]
|
||||
message = " ".join(sys.argv[4:])
|
||||
# Generate keys for both if needed
|
||||
sender_msg = AgentMessenger(sender)
|
||||
recipient_msg = AgentMessenger(recipient)
|
||||
# Create and read DM
|
||||
event = sender_msg.create_dm(recipient, message)
|
||||
print(f"Event ID: {event.id}")
|
||||
print(f"Encrypted content: {event.content[:80]}...")
|
||||
decrypted = recipient_msg.read_dm(event)
|
||||
print(f"Decrypted: {decrypted}")
|
||||
print("Round-trip encryption: OK" if decrypted == message else "ENCRYPTION FAILED")
|
||||
|
||||
elif cmd == "directory":
|
||||
directory = FleetDirectory()
|
||||
for name, entry in directory.list_all().items():
|
||||
print(f" {name}: {entry['npub'][:20]}... ({entry.get('role', 'unknown')})")
|
||||
Reference in New Issue
Block a user