There is a program that decodes a text in python. I would like that same method to be used to encode the output tekst.
The code is a decoding tool. so I thought if you use the code the other way around you can encode it. But since I don't understand the code itself, I can't reverse the code. so if someone can help me flip the code so you can encode the output again it would be great.
../samples/bartwolff.txt:
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
the output is:
Version and public cert for verification:
[b'\x02', 'VWS-CC-1']
QR data
{
"isSpecimen": "1",
"isPaperProof": "1",
"validFrom": "1627466400",
"validForHours": "25",
"firstNameInitial": "B",
"lastNameInitial": "B",
"birthDay": "31",
"birthMonth": "7"
}
source code:
import asn1
import base45
import sys
from typing import List, Dict, Optional
from var_dump import var_dump
import json
# Thanks to the great work of Bart Wollf
def asn1decode(d: asn1.Decoder):
res = []
while not d.eof():
tag = d.peek()
if tag.typ == asn1.Types.Primitive:
tag, value = d.read()
res.append(value)
elif tag.typ == asn1.Types.Constructed:
d.enter()
res.append(asn1decode(d))
d.leave()
return res
class NLDomesticCovidCertSerialization:
DisclosureTimeSeconds: int
C: int
A: int
EResponse: int
VResponse: int
AResponse: int
ADisclosed: List[int]
def __init__(self, data: List):
self.DisclosureTimeSeconds = data[0]
self.C = data[1]
self.A = data[2]
self.EResponse = data[3]
self.VResponse = data[4]
self.AResponse = data[5]
self.ADisclosed = data[6]
def decode_metadata(self) -> List:
b = NLDomesticCovidCertSerialization.decode_int(self.ADisclosed[0])
d = asn1.Decoder()
d.start(b)
return asn1decode(d)[0]
def decode_attributes(self) -> Dict[str, str]:
res = {}
attrs = ['isSpecimen',
'isPaperProof',
'validFrom',
'validForHours',
'firstNameInitial',
'lastNameInitial',
'birthDay',
'birthMonth']
for i, x in enumerate(self.ADisclosed[1:]):
res[attrs[i]] = NLDomesticCovidCertSerialization.decode_int(x).decode('utf-8')
return res
@staticmethod
def decode_int(value: int) -> Optional[bytes]:
if not value & 1:
return None
else:
v = value >> 1
return v.to_bytes((v.bit_length() + 7) // 8, byteorder='big')
def main():
with open("../samples/bartwolff.txt") as handle:
s = handle.readline().rstrip()
b45data = s[4:]
asn1data = base45.b58decode(b45data)
decoder = asn1.Decoder()
decoder.start(asn1data)
obj = asn1decode(decoder)[0]
annotator = NLDomesticCovidCertSerialization(obj)
print("Version and public cert for verification:")
print(annotator.decode_metadata())
print("\nQR data")
print(json.dumps(annotator.decode_attributes(), indent=4))
if __name__ == '__main__':
main()
