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Shortest TOTP I know of
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| #!/usr/bin/env python | |
| import base64,hashlib,hmac,struct,time,sys | |
| if not len(sys.argv[1:]): sys.exit('usage: totp <secret>') | |
| digest = hmac.new(base64.b32decode(sys.argv[1]), struct.pack('>Q', int(time.time()) // 30), hashlib.sha1).digest() | |
| offset = ord(digest[19]) & 15 | |
| print '06d' % (struct.unpack('>I', digest[offset:offset+4])[0] & 0x7fffffff % 1000000) |
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