3c65c18c83
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.
493 lines
16 KiB
Python
493 lines
16 KiB
Python
#!/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):
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return [ord(x) >> 5 for x in hrp] + [0] + [ord(x) & 31 for x in hrp]
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def _bech32_create_checksum(hrp, data):
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values = _bech32_hrp_expand(hrp) + data
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polymod = _bech32_polymod(values + [0, 0, 0, 0, 0, 0]) ^ 1
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return [(polymod >> 5 * (5 - i)) & 31 for i in range(6)]
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def _convertbits(data, frombits, tobits, pad=True):
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acc, bits, ret = 0, 0, []
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maxv = (1 << tobits) - 1
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for value in data:
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acc = (acc << frombits) | value
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bits += frombits
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while bits >= tobits:
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bits -= tobits
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ret.append((acc >> bits) & maxv)
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if pad and bits:
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ret.append((acc << (tobits - bits)) & maxv)
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return ret
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def bech32_encode(hrp: str, data: bytes) -> str:
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"""Encode bytes as bech32 (NIP-19)."""
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data5 = _convertbits(list(data), 8, 5)
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checksum = _bech32_create_checksum(hrp, data5)
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return hrp + "1" + "".join(BECH32_CHARSET[d] for d in data5 + checksum)
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def bech32_decode(bech: str) -> tuple[str, bytes]:
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"""Decode bech32 string. Returns (hrp, data_bytes)."""
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pos = bech.rfind("1")
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hrp = bech[:pos]
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data5 = [BECH32_CHARSET.index(c) for c in bech[pos + 1:]]
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data5 = data5[:-6] # strip checksum
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data8 = _convertbits(data5, 5, 8, pad=False)
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return hrp, bytes(data8)
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# === Key Management ===
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class NostrKeypair:
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"""A Nostr identity (secp256k1 keypair)."""
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def __init__(self, private_key: EllipticCurvePrivateKey):
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self._private_key = private_key
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# Extract raw 32-byte scalars
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private_numbers = private_key.private_numbers()
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self.secret_key = private_numbers.private_value.to_bytes(32, "big")
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public_numbers = private_numbers.public_numbers
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self.public_key = public_numbers.x.to_bytes(32, "big") # x-only pubkey (BIP-340)
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@classmethod
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def generate(cls) -> "NostrKeypair":
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"""Generate a new random keypair."""
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return cls(generate_private_key(SECP256K1()))
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@classmethod
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def from_nsec(cls, nsec: str) -> "NostrKeypair":
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"""Load from nsec bech32 string."""
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hrp, data = bech32_decode(nsec)
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assert hrp == "nsec", f"Expected nsec, got {hrp}"
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from cryptography.hazmat.primitives.asymmetric.ec import (
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EllipticCurvePrivateNumbers,
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SECP256K1,
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)
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from cryptography.hazmat.backends import default_backend
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private_value = int.from_bytes(data, "big")
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# Derive public key from private
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from cryptography.hazmat.primitives.asymmetric.ec import derive_private_key
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key = derive_private_key(private_value, SECP256K1(), default_backend())
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return cls(key)
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@classmethod
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def from_hex(cls, hex_secret: str) -> "NostrKeypair":
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"""Load from hex private key string."""
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from cryptography.hazmat.primitives.asymmetric.ec import derive_private_key
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from cryptography.hazmat.backends import default_backend
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private_value = int.from_bytes(bytes.fromhex(hex_secret), "big")
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key = derive_private_key(private_value, SECP256K1(), default_backend())
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return cls(key)
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@property
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def npub(self) -> str:
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return bech32_encode("npub", self.public_key)
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@property
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def nsec(self) -> str:
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return bech32_encode("nsec", self.secret_key)
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@property
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def pubkey_hex(self) -> str:
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return self.public_key.hex()
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@property
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def seckey_hex(self) -> str:
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return self.secret_key.hex()
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def save(self, path: str):
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"""Save keypair to JSON file (KEEP SECRET)."""
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data = {
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"npub": self.npub,
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"nsec": self.nsec,
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"pubkey_hex": self.pubkey_hex,
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"created": int(time.time()),
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}
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p = Path(path)
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p.parent.mkdir(parents=True, exist_ok=True)
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p.write_text(json.dumps(data, indent=2))
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os.chmod(path, 0o600)
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@classmethod
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def load(cls, path: str) -> "NostrKeypair":
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"""Load keypair from JSON file."""
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data = json.loads(Path(path).read_text())
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return cls.from_nsec(data["nsec"])
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@classmethod
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def load_or_create(cls, path: str) -> "NostrKeypair":
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"""Load existing keypair or generate and save a new one."""
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p = Path(path)
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if p.exists():
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return cls.load(path)
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kp = cls.generate()
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kp.save(path)
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return kp
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# === Event Signing (NIP-01) ===
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class NostrEvent:
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"""A signed Nostr event."""
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def __init__(self, kind: int, content: str, tags: list = None,
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pubkey: str = "", created_at: int = None, id: str = "",
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sig: str = ""):
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self.kind = kind
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self.content = content
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self.tags = tags or []
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self.pubkey = pubkey
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self.created_at = created_at or int(time.time())
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self.id = id
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self.sig = sig
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def compute_id(self) -> str:
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"""Compute event ID (sha256 of serialized event)."""
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serialized = json.dumps([
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0,
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self.pubkey,
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self.created_at,
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self.kind,
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self.tags,
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self.content,
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], separators=(",", ":"), ensure_ascii=False)
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return hashlib.sha256(serialized.encode("utf-8")).hexdigest()
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def sign(self, keypair: NostrKeypair) -> "NostrEvent":
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"""Sign the event with a keypair. Returns self for chaining."""
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self.pubkey = keypair.pubkey_hex
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self.id = self.compute_id()
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# Schnorr signature (BIP-340) via cryptography library
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# We use ECDSA and convert — proper Schnorr needs secp256k1 lib
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# For now, use deterministic ECDSA as a signing mechanism
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from cryptography.hazmat.primitives.asymmetric.ec import ECDSA
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id_bytes = bytes.fromhex(self.id)
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signature = keypair._private_key.sign(id_bytes, ECDSA(SHA256()))
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r, s = decode_dss_signature(signature)
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self.sig = r.to_bytes(32, "big").hex() + s.to_bytes(32, "big").hex()
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return self
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def to_dict(self) -> dict:
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return {
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"id": self.id,
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"pubkey": self.pubkey,
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"created_at": self.created_at,
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"kind": self.kind,
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"tags": self.tags,
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"content": self.content,
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"sig": self.sig,
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}
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def to_relay_message(self) -> str:
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"""Format as relay EVENT message."""
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return json.dumps(["EVENT", self.to_dict()])
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@classmethod
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def from_dict(cls, d: dict) -> "NostrEvent":
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return cls(
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kind=d["kind"],
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content=d["content"],
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tags=d.get("tags", []),
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pubkey=d.get("pubkey", ""),
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created_at=d.get("created_at", 0),
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id=d.get("id", ""),
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sig=d.get("sig", ""),
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)
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# === Encrypted Direct Messages (NIP-04 style, simplified) ===
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def _shared_secret(keypair: NostrKeypair, recipient_pubkey_hex: str) -> bytes:
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"""Derive shared secret via ECDH for encrypted DMs."""
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from cryptography.hazmat.primitives.asymmetric.ec import (
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EllipticCurvePublicNumbers,
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SECP256K1,
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)
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from cryptography.hazmat.backends import default_backend
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# Reconstruct full public key from x-only
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x = int(recipient_pubkey_hex, 16)
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# For secp256k1, compute y from x
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p = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F
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y_sq = (pow(x, 3, p) + 7) % p
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y = pow(y_sq, (p + 1) // 4, p)
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if y % 2 != 0:
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y = p - y # Use even y (convention)
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pub_numbers = EllipticCurvePublicNumbers(x, y, SECP256K1())
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pub_key = pub_numbers.public_key(default_backend())
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shared = keypair._private_key.exchange(ECDH(), pub_key)
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return hashlib.sha256(shared).digest()
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def encrypt_dm(keypair: NostrKeypair, recipient_pubkey_hex: str, plaintext: str) -> str:
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"""Encrypt a direct message (NIP-44 style with ChaCha20-Poly1305)."""
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shared = _shared_secret(keypair, recipient_pubkey_hex)
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nonce = secrets.token_bytes(12)
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cipher = ChaCha20Poly1305(shared)
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ciphertext = cipher.encrypt(nonce, plaintext.encode("utf-8"), None)
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import base64
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payload = {
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"v": 2,
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"nonce": base64.b64encode(nonce).decode(),
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"ciphertext": base64.b64encode(ciphertext).decode(),
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}
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return json.dumps(payload)
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def decrypt_dm(keypair: NostrKeypair, sender_pubkey_hex: str, encrypted: str) -> str:
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"""Decrypt a direct message."""
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import base64
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payload = json.loads(encrypted)
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shared = _shared_secret(keypair, sender_pubkey_hex)
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nonce = base64.b64decode(payload["nonce"])
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ciphertext = base64.b64decode(payload["ciphertext"])
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cipher = ChaCha20Poly1305(shared)
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plaintext = cipher.decrypt(nonce, ciphertext, None)
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return plaintext.decode("utf-8")
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# === Relay Communication ===
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class NostrRelay:
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"""Simple synchronous Nostr relay client using websockets."""
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def __init__(self, url: str = "wss://relay.damus.io"):
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self.url = url
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self._ws = None
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async def connect(self):
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"""Connect to relay."""
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import websockets
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self._ws = await websockets.connect(self.url)
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return self
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async def publish(self, event: NostrEvent) -> str:
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"""Publish an event to the relay."""
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msg = event.to_relay_message()
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await self._ws.send(msg)
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response = await self._ws.recv()
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return response
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async def subscribe(self, filters: dict, subscription_id: str = None) -> str:
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"""Subscribe to events matching filters."""
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sub_id = subscription_id or secrets.token_hex(8)
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msg = json.dumps(["REQ", sub_id, filters])
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await self._ws.send(msg)
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return sub_id
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async def receive(self) -> dict:
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"""Receive next message from relay."""
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raw = await self._ws.recv()
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return json.loads(raw)
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async def close(self):
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"""Close relay connection."""
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if self._ws:
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await self._ws.close()
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# === Fleet Directory ===
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class FleetDirectory:
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"""
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Maps wizard names to Nostr public keys.
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This is the fleet's address book.
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"""
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def __init__(self, path: str = None):
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self.path = Path(path or "/root/wizards/ezra/tools/fleet_nostr_directory.json")
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self.entries = {}
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if self.path.exists():
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self.entries = json.loads(self.path.read_text())
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def register(self, name: str, npub: str, pubkey_hex: str, role: str = ""):
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"""Register a wizard in the fleet directory."""
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self.entries[name] = {
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"npub": npub,
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"pubkey_hex": pubkey_hex,
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"role": role,
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"registered": int(time.time()),
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}
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self.save()
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def get(self, name: str) -> Optional[dict]:
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return self.entries.get(name)
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def get_pubkey(self, name: str) -> Optional[str]:
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entry = self.get(name)
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return entry["pubkey_hex"] if entry else None
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def list_all(self) -> dict:
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return dict(self.entries)
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def save(self):
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self.path.parent.mkdir(parents=True, exist_ok=True)
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self.path.write_text(json.dumps(self.entries, indent=2))
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# === High-Level Agent Messaging API ===
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class AgentMessenger:
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"""
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High-level API for wizard-to-wizard messaging over Nostr.
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Each wizard house instantiates this with their keypair.
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"""
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def __init__(self, wizard_name: str, keys_dir: str = None):
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self.wizard_name = wizard_name
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keys_dir = keys_dir or f"/root/wizards/{wizard_name}/protected"
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self.keypair = NostrKeypair.load_or_create(f"{keys_dir}/nostr_keys.json")
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self.directory = FleetDirectory()
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# Auto-register self
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self.directory.register(
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wizard_name,
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self.keypair.npub,
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self.keypair.pubkey_hex,
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role="wizard",
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)
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def create_dm(self, recipient_name: str, message: str) -> NostrEvent:
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"""Create an encrypted DM event for another wizard."""
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recipient_pubkey = self.directory.get_pubkey(recipient_name)
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if not recipient_pubkey:
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raise ValueError(f"Unknown wizard: {recipient_name}. Register them first.")
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encrypted = encrypt_dm(self.keypair, recipient_pubkey, message)
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event = NostrEvent(
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kind=4, # NIP-04 encrypted DM
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content=encrypted,
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tags=[["p", recipient_pubkey]],
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)
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event.sign(self.keypair)
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return event
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def read_dm(self, event: NostrEvent) -> str:
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"""Decrypt a DM event sent to this wizard."""
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return decrypt_dm(self.keypair, event.pubkey, event.content)
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def create_broadcast(self, message: str, kind: int = 30078) -> NostrEvent:
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"""Create a fleet broadcast (unencrypted, kind 30078 = app-specific)."""
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event = NostrEvent(
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kind=kind,
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content=message,
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tags=[["d", f"fleet-{self.wizard_name}"], ["t", "timmy-fleet"]],
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)
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event.sign(self.keypair)
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return event
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def identity_card(self) -> dict:
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"""Return this wizard's Nostr identity for sharing."""
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return {
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"wizard": self.wizard_name,
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"npub": self.keypair.npub,
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"pubkey_hex": self.keypair.pubkey_hex,
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}
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# === CLI Entry Point ===
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if __name__ == "__main__":
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import sys
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if len(sys.argv) < 2:
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print("Usage:")
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print(" python3 nostr_agent.py keygen <wizard_name>")
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print(" python3 nostr_agent.py identity <wizard_name>")
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print(" python3 nostr_agent.py encrypt <from_wizard> <to_wizard> <message>")
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print(" python3 nostr_agent.py directory")
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sys.exit(0)
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cmd = sys.argv[1]
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if cmd == "keygen":
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name = sys.argv[2] if len(sys.argv) > 2 else "ezra"
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messenger = AgentMessenger(name)
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card = messenger.identity_card()
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print(f"Wizard: {card['wizard']}")
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print(f"npub: {card['npub']}")
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print(f"pubkey: {card['pubkey_hex']}")
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print(f"Keys saved to: /root/wizards/{name}/protected/nostr_keys.json")
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elif cmd == "identity":
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name = sys.argv[2]
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messenger = AgentMessenger(name)
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card = messenger.identity_card()
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print(json.dumps(card, indent=2))
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elif cmd == "encrypt":
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sender = sys.argv[2]
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recipient = sys.argv[3]
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message = " ".join(sys.argv[4:])
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# Generate keys for both if needed
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sender_msg = AgentMessenger(sender)
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recipient_msg = AgentMessenger(recipient)
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# Create and read DM
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event = sender_msg.create_dm(recipient, message)
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print(f"Event ID: {event.id}")
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print(f"Encrypted content: {event.content[:80]}...")
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decrypted = recipient_msg.read_dm(event)
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print(f"Decrypted: {decrypted}")
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print("Round-trip encryption: OK" if decrypted == message else "ENCRYPTION FAILED")
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elif cmd == "directory":
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directory = FleetDirectory()
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for name, entry in directory.list_all().items():
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print(f" {name}: {entry['npub'][:20]}... ({entry.get('role', 'unknown')})")
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