TEE Attestation

import requests
from cryptography import x509
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives.asymmetric import ec
from cryptography.hazmat.primitives import hashes
from datetime import datetime, timedelta

class TEEAttestationVerifier:
    def __init__(self, api_key):
        self.api_key = api_key
        self.base_url = "https://api.redpill.ai/v1"

    def get_attestation(self, model):
        """Fetch attestation report for a model"""
        response = requests.get(
            f"{self.base_url}/attestation/report?model={model}",
            headers={"Authorization": f"Bearer {self.api_key}"}
        )
        return response.json()

    def verify_attestation(self, attestation):
        """Verify all aspects of attestation"""
        # 1. Verify certificate chain
        if not self._verify_cert_chain(attestation["signature"]["cert_chain"]):
            raise ValueError("Invalid certificate chain")

        # 2. Verify signature
        if not self._verify_signature(attestation):
            raise ValueError("Invalid signature")

        # 3. Verify code hash
        if not self._verify_code_hash(
            attestation["model"],
            attestation["measurements"]["code_hash"]
        ):
            raise ValueError("Code hash mismatch")

        # 4. Verify timestamp freshness
        if not self._verify_freshness(attestation["timestamp"]):
            raise ValueError("Attestation too old")

        return True

    def _verify_cert_chain(self, cert_chain):
        """Verify X.509 certificate chain"""
        # Implementation details...
        return True

    def _verify_signature(self, attestation):
        """Verify cryptographic signature"""
        # Implementation details...
        return True

    def _verify_code_hash(self, model, code_hash):
        """Verify code hash matches expected"""
        expected_hashes = {
            "phala/qwen-2.5-7b-instruct": "a7f3b2c1...",
            # Add other models
        }
        return code_hash == expected_hashes.get(model)

    def _verify_freshness(self, timestamp, max_age_minutes=10):
        """Verify attestation is recent"""
        att_time = datetime.fromisoformat(timestamp.replace('Z', '+00:00'))
        age = datetime.utcnow() - att_time.replace(tzinfo=None)
        return age < timedelta(minutes=max_age_minutes)

# Usage
verifier = TEEAttestationVerifier("YOUR_API_KEY")
attestation = verifier.get_attestation("phala/qwen-2.5-7b-instruct")

try:
    verifier.verify_attestation(attestation)
    print("✅ Attestation verified successfully!")
    print(f"Code running in genuine {attestation['attestation']['type']}")
except ValueError as e:
    print(f"❌ Attestation verification failed: {e}")