Forked from yaci/eu-covid-certificate-qr-decoder.py
Created
November 4, 2021 01:36
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Decode information from European covid19 travel certificates
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| ####### | |
| # | |
| # REQUIRES: pip install cose #!!!! | |
| # | |
| # HOW TO USE: | |
| # 1. Use your favourite QR scanner to scan the code from a certificate, | |
| # you'll get a string that starts with "HC1:" | |
| # 2. Run the script: python3 covid-qr-certificate-decoder.py | |
| # 3. Paste the string when prompted | |
| # | |
| # | |
| # READING (how to interpret the output and test data): | |
| # api spec: https://github.com/eu-digital-green-certificates/dgca-issuance-web/blob/main/src/generated-files/dgc-combined-schema.d.ts | |
| # https://github.com/eu-digital-green-certificates/dgca-issuance-web/blob/main/src/misc/edgcProcessor.tsx | |
| # https://github.com/admin-ch/CovidCertificate-Examples | |
| # https://github.com/eu-digital-green-certificates/dgc-testdata/tree/main/PL | |
| # | |
| ####### | |
| from typing import Union | |
| import zlib | |
| from cose.messages import CoseMessage | |
| import cbor2 | |
| import pprint | |
| import json | |
| # example code for testing | |
| # QRCODE = 'HC1:6BFC80Z80T9WTWGVLK659A:TG4G$BTZM0X*4FBBE*3FN0KKC+H3WY0/9CWC4*70 6AD97TK0F90KECTHGXJC$+D.JCBECB1A-:8$966469L6OF6VX6Z/ER2DD46JH8946XJCCWENF6OF63W5NW60A6WJCT3E 6AWJC0FDTA6AIA%G7X+AQB9746XG7TS9 967:6DL6WX8BM8CA6DB83R63X6$A7UF6QG8Q46/A8.A8$96V47.JCP9EJY8L/5M/5 96.96WF6%JCXQEIN8G/D6LE ZDQZCAJB0LEE4F0ECKQEPD09WEQDD+Q6TW6FA7C46TPCBEC8ZKW.CHWEBIAG09:S9Q+9DN90S7BIAOT9W.CUEEY3EAECWGDMXG2QDUW5*MEWUMMPCG/D8EDETAG+9*NAWB8 JC6/DYOACEC+EDR/OLEC$PC5$CUZCY$5Y$5JPCT3E5JDKA7Q47%964W5WA6N68$E5FAWIBG9SQCLEH19FZMD8B TL6AW8JJRBHTB91L0GMSNRCBBPL8R958CR2:7T84H7*6C V86W0*8G1MZJVS72L:M5WAB9UB0HF0' | |
| # credits: https://github.com/kirei/python-base45/blob/main/base45/__init__.py | |
| def b45decode(s: Union[bytes, str]) -> bytes: | |
| """Decode base45-encoded string to bytes""" | |
| BASE45_CHARSET = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ $%*+-./:" | |
| res = [] | |
| try: | |
| if isinstance(s, str): | |
| buf = [BASE45_CHARSET.index(c) for c in s] | |
| else: | |
| buf = [BASE45_CHARSET.index(c) for c in s.decode()] | |
| buflen = len(buf) | |
| for i in range(0, buflen, 3): | |
| x = buf[i] + buf[i + 1] * 45 | |
| if buflen - i >= 3: | |
| x = buf[i] + buf[i + 1] * 45 + buf[i + 2] * 45 * 45 | |
| res.extend(list(divmod(x, 256))) | |
| else: | |
| res.append(x) | |
| return bytes(res) | |
| except (ValueError, IndexError, AttributeError): | |
| raise ValueError("Invalid base45 string") | |
| def main() -> None: | |
| data = input("Paste the decoded QR code string and press Enter:\n") | |
| if data.startswith('HC1:'): data = data[4:] | |
| decoded = b45decode(data) | |
| decompressed = zlib.decompress(decoded); | |
| msg = CoseMessage.decode(decompressed); | |
| phdr, uhdr = msg._hdr_repr() | |
| payload = cbor2.loads(msg.payload) | |
| #payload is the most interesting part, the others are rather boring | |
| print("\n") | |
| print("==PHDR==\n") | |
| pprint.pprint(phdr) | |
| print("==UHDR==\n") | |
| pprint.pprint(uhdr) | |
| #print("==SIGNATURE==\n",msg.signature,"\n") | |
| print("==PAYLOAD==") | |
| print(json.dumps(payload, ensure_ascii=False, indent=4)) | |
| print("\n") | |
| if __name__ == "__main__": | |
| main() |
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