Created
May 16, 2020 16:02
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Compute the current CuidAR security code. @see https://www.argentina.gob.ar/aplicaciones/coronavirus
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#!/usr/bin/python3 | |
import base64 | |
import hmac | |
import struct | |
import time | |
def hotp(key, counter, digits=6, digest='sha1'): | |
key = base64.b32decode(key.upper() + '=' * ((8 - len(key)) % 8)) | |
counter = struct.pack('>Q', counter) | |
mac = hmac.new(key, counter, digest).digest() | |
offset = mac[-1] & 0x0f | |
binary = struct.unpack('>L', mac[offset:offset+4])[0] & 0x7fffffff | |
return str(binary)[-digits:].rjust(digits, '0') | |
def totp(key, time_step=30, digits=6, digest='sha1'): | |
return hotp(key, int(time.time() / time_step), digits, digest) | |
val = int(totp("MFZWIRTHONSFGZZTGRDUQII=", 1500, 8)) | |
print('{:X}{:X}{:X}'.format((val & 3840) // 256, (val & 240) // 16, val & 15)) |
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