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20 lines
600 B
Python
20 lines
600 B
Python
# https://github.com/susam/mintotp
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#!/usr/bin/env python3
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import base64
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import hmac
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import struct
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import sys
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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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offset = mac[-1] & 0x0f
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binary = struct.unpack('>L', mac[offset:offset+4])[0] & 0x7fffffff
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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) |