Created
July 12, 2021 23:13
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A simple EUDCC verifier implementation with Python CWT: refresh_trustlist
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| def refresh_trustlist(self): | |
| self._dscs = [] | |
| self._trustlist = [] | |
| # Get a trust-list signer certificate. | |
| r = requests.get(self._base_url + "/cert") | |
| if r.status_code != 200: | |
| raise Exception(f"Received {r.status_code} from /cert") | |
| key = r.text | |
| cose_key = COSEKey.from_pem(key) | |
| # Get DSCs | |
| r = requests.get(self._base_url + "/trust-list") | |
| if r.status_code != 200: | |
| raise Exception(f"Received {r.status_code} from /trust-list") | |
| decoded = jwt.decode( | |
| r.text, | |
| cose_key.key, | |
| algorithms=["ES256"], | |
| options={"verify_aud": False}, | |
| ) | |
| for v in decoded["dsc_trust_list"].values(): | |
| for k in v["keys"]: | |
| if "use" in k and k["use"] == "enc": | |
| # Workaround for a wrong DSC. | |
| del k["use"] | |
| if k["kty"] == "RSA": | |
| k["alg"] = "PS256" | |
| self._dscs.append(COSEKey.from_jwk(k)) | |
| self._trustlist.append(k) | |
| # Update trustlist store. | |
| with open(self._trustlist_store_path, "w") as f: | |
| json.dump(self._trustlist, f, indent=4) | |
| return |
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