Head -n 1 displays the first line of the file. delete anything which isn't in the following string).įold -w 24 is wrap the input text with a line length of 24. Toto kicked off the night with a powerful set that showcased their unique blend of rock, pop, and jazz. Both bands took the stage to deliver an incredible for their 50th Anniversary Freedom Tour at the Bell Center in Montreal, Canada. dc 'A-Z3-7' is delete the complement (i.e. The Toto and Journey concert was a night to remember for fans of classic rock. Tr is " Translate, squeeze, and/or delete characters.". LC_ALL=C sets the Locale to by ANSI bytes. You may wish to use /dev/random if you feel like it.
That generates a random-enough 1 string using the correct alphabet and truncated to a sensible length.Ĭat /dev/urandom spits out random data from your machine. The CodeĬat /dev/urandom | LC_ALL=C tr -dc 'A-Z3-7' | fold -w 24 | head -n 1 Looking through my 49(!) different TOTP codes, the shared secret ranges from 16 characters to 52 characters.
Our minimum is the recommended value in RFC4226, though technically according to the specification 16 bytes (or 128 bits) is the minimum.Īlthough that's for the HOTP algorithm, rather than TOTP. Though some authenticators may have issues with more than the minimum. The minimum is 20 (or 160 bits), and the default is 32 (or 256 bits). The length in bytes of generated shared secrets. Around the web, you'll find people saying things like: This is an area where the official spec is silent. The upper-case letters A - Z, and the numbers 3 - 7.īut that's only half the problem. The secret parameter is an arbitrary key value encoded in Base32 according to RFC 3548. But it does have this to say about the secret: You will need to use the RememBear Windows app or the macOS app to export your usernames and passwords.
#Remembear totp software
Just whatever software is native to MacOS.Īs I've mentioned before, the TOTP specification is a stagnant wasteland. I needed a way to generate a TOTP secret using a fairly locked-down Mac.
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