2021-08-20 12:44:03 +01:00
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import base64
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import struct
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import hmac
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import time
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def hotp(key, counter, digits=6, digest="sha1"):
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key = base64.b32decode(key.upper() + "=" * ((8 - len(key)) % 8))
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counter = struct.pack(">Q", counter)
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mac = hmac.new(key, counter, digest).digest()
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2021-10-17 18:33:29 +01:00
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offset = mac[-1] & 0x0F
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binary = struct.unpack(">L", mac[offset : offset + 4])[0] & 0x7FFFFFFF
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2021-08-20 12:44:03 +01:00
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return str(binary)[-digits:].zfill(digits)
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def totp(key, time_step=30, digits=6, digest="sha1"):
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return hotp(key, int(time.time() / time_step), digits, digest)
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