TOTP 2FA Password

2 Factor Authentication Time-Based One-Time Password

TOTP算法

Python实现 适当简化 提供密钥即可生成一次性密码

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import base64
import hmac
import struct
import time


def ttotp(key):
    key = base64.b32decode(key.upper() + '=' * ((8 - len(key)) % 8))
    counter = struct.pack('>Q', int(time.time() / 30))
    mac = hmac.new(key, counter, 'sha1').digest()
    offset = mac[-1] & 0x0f
    binary = struct.unpack('>L', mac[offset:offset+4])[0] & 0x7fffffff
    return str(binary)[-6:].zfill(6)


if __name__ == '__main__':
    # main()
    key = 'PRCFQ3SPFMOTIR2D' # 密钥
    print(ttotp(key))