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https://github.com/markqvist/RNode_Firmware.git
synced 2026-04-27 22:35:36 +00:00
Add IFAC crypto test vectors — all 4 tests pass
Firmware crypto test (debug command 'C') validates IfacAuth.h against test vectors generated by scripts/test_ifac.py from Reticulum's Python implementation: pk: Ed25519 keypair from seed PASS sig: Ed25519 detached signature PASS hkdf: HKDF-SHA256 mask generation PASS ifac: Full IFAC packet wrapping PASS The IFAC crypto implementation matches Reticulum exactly. The beacon reception failure is NOT a crypto bug — likely an IFAC key provisioning issue (NVS storage mismatch) or a beacon packet format issue before IFAC is applied. Run: ./scripts/screenshot.py crypto Generate vectors: python3 scripts/test_ifac.py Also: guarded profiling variables for non-T-Watch builds so T-Beam Supreme and other targets compile cleanly.
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GlassOnTin
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3 changed files with 296 additions and 0 deletions
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@ -186,6 +186,38 @@ def cmd_profile(s, save_path=None):
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print(f"Timeout ({len(buf)} bytes)")
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def cmd_crypto(s):
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"""Run IFAC crypto test vectors on firmware"""
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send_cmd(s, ord('C'))
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buf = b""
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deadline = time.time() + 10
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while time.time() < deadline:
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chunk = s.read(max(1, s.in_waiting or 1))
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if chunk:
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buf += chunk
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magic = PREFIX + b"C"
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idx = buf.find(magic)
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if idx >= 0:
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nl = buf.find(b"\n", idx + 4)
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if nl >= 0:
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import json
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data = json.loads(buf[idx + 4:nl])
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all_pass = True
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for test, result in data.items():
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if test in ("pk", "sig", "hkdf", "ifac"):
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status = "PASS" if result else "FAIL"
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if not result:
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all_pass = False
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print(f" {test:>6}: {status}")
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if not all_pass:
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for k, v in data.items():
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if k.startswith("actual_"):
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print(f" {k}: {v}")
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print(f"\n {'ALL PASS' if all_pass else 'FAILED'}")
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return
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print(f"Timeout ({len(buf)} bytes)")
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def cmd_invalidate(s):
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send_cmd(s, ord('I'))
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print("Invalidated — full redraw requested")
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@ -250,6 +282,9 @@ def main():
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sub.add_parser("invalidate", aliases=["inv"])
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sub.add_parser("crypto", aliases=["c"],
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help="Run IFAC crypto test vectors on firmware")
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p = sub.add_parser("profile", aliases=["p"],
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help="Run standardized performance test")
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p.add_argument("--save", metavar="FILE", help="Save raw JSON to file")
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@ -279,6 +314,8 @@ def main():
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cmd_navigate(s, args.screen)
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elif args.command in ("invalidate", "inv"):
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cmd_invalidate(s)
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elif args.command in ("crypto", "c"):
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cmd_crypto(s)
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elif args.command in ("profile", "p"):
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cmd_profile(s, getattr(args, 'save', None))
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elif args.command in ("log", "l"):
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180
scripts/test_ifac.py
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180
scripts/test_ifac.py
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@ -0,0 +1,180 @@
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#!/usr/bin/env python3
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"""
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IFAC Crypto Test — compares IfacAuth.h C implementation against Reticulum Python
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Tests each stage of the IFAC pipeline:
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1. Ed25519 keypair derivation from seed
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2. Ed25519 signing
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3. HKDF expansion
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4. Full IFAC apply on a test packet
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Run standalone to generate test vectors, or with --firmware to
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send test vectors to the watch and compare output.
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Usage:
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python3 scripts/test_ifac.py # generate test vectors
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python3 scripts/test_ifac.py --firmware # compare with firmware
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"""
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import sys
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import os
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import hashlib
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import hmac
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# Add RNS to path
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sys.path.insert(0, os.path.expanduser("~/.local/lib/python3.13/site-packages"))
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import RNS
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from RNS.Cryptography.pure25519 import ed25519_oop as ed25519
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from RNS.Cryptography.pure25519._ed25519 import sign as ed25519_raw_sign
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def hkdf_sha256(ikm, salt, length, context=None):
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"""Replicate RNS.Cryptography.hkdf exactly"""
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return RNS.Cryptography.hkdf(
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length=length,
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derive_from=ikm,
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salt=salt,
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context=context,
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)
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def hkdf_sha256_manual(ikm, salt, output_len):
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"""Manual HKDF-SHA256 matching our C implementation"""
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# Extract
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prk = hmac.new(salt, ikm, hashlib.sha256).digest()
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# Expand
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output = b""
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prev_block = b""
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block_idx = 0
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while len(output) < output_len:
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expand_input = prev_block + bytes([(block_idx + 1) % 256])
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block = hmac.new(prk, expand_input, hashlib.sha256).digest()
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output += block
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prev_block = block
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block_idx += 1
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return output[:output_len]
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def ifac_apply_python(pkt, ifac_key, ifac_size=8):
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"""Replicate Reticulum's Transport.transmit IFAC application"""
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# Create identity from ifac_key (last 32 bytes = Ed25519 seed)
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sig_seed = ifac_key[32:]
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identity = RNS.Identity.from_bytes(ifac_key)
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# 1. Sign the original packet
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sig = identity.sign(pkt) # Returns 64-byte signature
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assert len(sig) == 64, f"Signature length: {len(sig)}"
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# 2. Extract IFAC: last 8 bytes of signature
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ifac = sig[-ifac_size:]
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# 3. Generate mask
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mask = RNS.Cryptography.hkdf(
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length=len(pkt) + ifac_size,
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derive_from=ifac,
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salt=ifac_key,
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context=None,
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)
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# 4. Set IFAC flag + assemble
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new_header = bytes([pkt[0] | 0x80, pkt[1]])
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new_raw = new_header + ifac + pkt[2:]
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# 5. Mask
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masked = bytearray()
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for i, byte in enumerate(new_raw):
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if i == 0:
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masked.append((byte ^ mask[i]) | 0x80)
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elif i == 1 or i > ifac_size + 1:
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masked.append(byte ^ mask[i])
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else:
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masked.append(byte) # Don't mask IFAC itself
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return bytes(masked)
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def main():
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print("=" * 60)
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print("IFAC Crypto Test Vectors")
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print("=" * 60)
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# Known IFAC key (helv4net / R3ticulum-priv8-m3sh)
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network_name = "helv4net"
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passphrase = "R3ticulum-priv8-m3sh"
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ifac_origin = b""
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ifac_origin += RNS.Identity.full_hash(network_name.encode("utf-8"))
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ifac_origin += RNS.Identity.full_hash(passphrase.encode("utf-8"))
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ifac_origin_hash = RNS.Identity.full_hash(ifac_origin)
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ifac_key = hkdf_sha256(ifac_origin_hash, RNS.Reticulum.IFAC_SALT, 64)
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print(f"\n1. IFAC Key Derivation")
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print(f" Network: {network_name}")
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print(f" Pass: {passphrase}")
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print(f" Key: {ifac_key.hex()}")
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# Ed25519 seed = last 32 bytes of ifac_key
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ed25519_seed = ifac_key[32:]
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print(f"\n2. Ed25519 Seed (ifac_key[32:64])")
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print(f" Seed: {ed25519_seed.hex()}")
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# Derive keypair
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sk = ed25519.SigningKey(ed25519_seed)
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pk = sk.get_verifying_key()
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print(f" PK: {pk.to_bytes().hex()}")
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# Also show the full sk_s (seed + pk, 64 bytes — libsodium format)
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sk_s = sk.sk_s # This is the internal 64-byte representation
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print(f" SK(64): {sk_s.hex()}")
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# Test signing with a known message
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test_msg = bytes([0x00, 0x00, 0x12, 0x34, 0x56, 0x78, 0x9A, 0xBC,
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0xDE, 0xF0, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66,
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0x77, 0x88, 0x99])
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print(f"\n3. Ed25519 Signature Test")
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print(f" Msg: {test_msg.hex()}")
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sig = sk.sign(test_msg)
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print(f" Sig: {sig.hex()}")
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print(f" Last 8: {sig[-8:].hex()}")
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# HKDF test
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test_ikm = sig[-8:]
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print(f"\n4. HKDF Test")
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print(f" IKM: {test_ikm.hex()}")
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print(f" Salt: {ifac_key.hex()}")
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mask_rns = hkdf_sha256(test_ikm, ifac_key, 27)
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mask_manual = hkdf_sha256_manual(test_ikm, ifac_key, 27)
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print(f" RNS: {mask_rns.hex()}")
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print(f" Manual: {mask_manual.hex()}")
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print(f" Match: {mask_rns == mask_manual}")
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# Full IFAC apply
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print(f"\n5. Full IFAC Apply")
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print(f" Input: {test_msg.hex()} ({len(test_msg)} bytes)")
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result = ifac_apply_python(test_msg, ifac_key)
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print(f" Output: {result.hex()} ({len(result)} bytes)")
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print(f" Size: {len(test_msg)} -> {len(result)}")
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# Generate C test vector
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print(f"\n{'=' * 60}")
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print(f"C Test Vectors (paste into firmware test)")
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print(f"{'=' * 60}")
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print(f"const uint8_t test_ifac_key[64] = {{{', '.join(f'0x{b:02x}' for b in ifac_key)}}};")
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print(f"const uint8_t test_ed25519_seed[32] = {{{', '.join(f'0x{b:02x}' for b in ed25519_seed)}}};")
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print(f"const uint8_t test_ed25519_pk[32] = {{{', '.join(f'0x{b:02x}' for b in pk.to_bytes())}}};")
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print(f"const uint8_t test_msg[{len(test_msg)}] = {{{', '.join(f'0x{b:02x}' for b in test_msg)}}};")
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print(f"const uint8_t test_sig[64] = {{{', '.join(f'0x{b:02x}' for b in sig)}}};")
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print(f"const uint8_t test_ifac[8] = {{{', '.join(f'0x{b:02x}' for b in sig[-8:])}}};")
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print(f"const uint8_t test_mask[{len(result)}] = {{{', '.join(f'0x{b:02x}' for b in mask_rns[:len(result)])}}};")
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print(f"const uint8_t test_result[{len(result)}] = {{{', '.join(f'0x{b:02x}' for b in result)}}};")
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if __name__ == "__main__":
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main()
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