examples/store_model_weights.py
| 1 | """Store a 256 KB block of model weights in an in-memory enclave vault. |
| 2 | |
| 3 | Demonstrates the full lifecycle: unlock -> put -> save -> lock -> unlock -> get. |
| 4 | The InMemoryEnclaveBackend is used so the example runs without any platform |
| 5 | secure element. A production deployment swaps in iOSEnclaveBackend, |
| 6 | AndroidEnclaveBackend, or QSEEBackend. |
| 7 | """ |
| 8 | |
| 9 | from __future__ import annotations |
| 10 | |
| 11 | import os |
| 12 | |
| 13 | from pqc_enclave_sdk import ( |
| 14 | ArtifactKind, |
| 15 | EnclaveVault, |
| 16 | InMemoryEnclaveBackend, |
| 17 | ) |
| 18 | |
| 19 | |
| 20 | def main() -> None: |
| 21 | weights = os.urandom(256 * 1024) # 256 KB simulated INT4 weights |
| 22 | backend = InMemoryEnclaveBackend( |
| 23 | device_id="iphone-alice-demo", |
| 24 | device_model="iphone-15-pro", |
| 25 | ) |
| 26 | |
| 27 | vault = EnclaveVault(backend=backend) |
| 28 | vault.unlock() |
| 29 | print(f"[unlock] vault unlocked. key_id={vault._key_id}") |
| 30 | |
| 31 | enc = vault.put_artifact( |
| 32 | name="llama-3.2-1b-int4", |
| 33 | kind=ArtifactKind.MODEL_WEIGHTS, |
| 34 | content=weights, |
| 35 | version="1.0.0", |
| 36 | app_bundle_id="com.example.localllm", |
| 37 | tags=("prod", "int4"), |
| 38 | description="Llama 3.2 1B INT4 weights for on-device inference.", |
| 39 | ) |
| 40 | print( |
| 41 | f"[put] artifact_id={enc.metadata.artifact_id} " |
| 42 | f"size={enc.metadata.size_bytes} bytes " |
| 43 | f"sha3={enc.content_hash[:16]}..." |
| 44 | ) |
| 45 | |
| 46 | vault.save() |
| 47 | print("[save] encrypted store persisted to backend") |
| 48 | |
| 49 | # Preserve the session key so a fresh vault unlock can still decrypt |
| 50 | # the persisted artifact. In a real deployment the enclave holds the |
| 51 | # wrapping KEK and re-derives the same session key on next unlock. |
| 52 | saved_key = vault._symmetric_key |
| 53 | saved_key_id = vault._key_id |
| 54 | saved_exp = vault._expires_at |
| 55 | |
| 56 | vault.lock() |
| 57 | print("[lock] vault sealed") |
| 58 | |
| 59 | vault2 = EnclaveVault(backend=backend) |
| 60 | vault2.unlock() |
| 61 | vault2._symmetric_key = saved_key |
| 62 | vault2._key_id = saved_key_id |
| 63 | vault2._expires_at = saved_exp |
| 64 | vault2._store = backend.load_artifacts() |
| 65 | print("[unlock] fresh vault over same backend") |
| 66 | |
| 67 | art = vault2.get_artifact("llama-3.2-1b-int4") |
| 68 | assert art.content == weights |
| 69 | print(f"[get] decrypted {len(art.content)} bytes, match={art.content == weights}") |
| 70 | |
| 71 | |
| 72 | if __name__ == "__main__": |
| 73 | main() |
| 74 | |