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Shell script implementation of TOTP (RFC 6238) using openssl command line tool

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totp.sh

This is a simple shell script implementation of TOTP (RFC 6238). It depends only on a base32 utility, date command supporting %s format, and openssl command line utility.

Usage

totp.sh < secretfile

where secretfile contains the base32-encoded secret.

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Shell script implementation of TOTP (RFC 6238) using openssl command line tool

Topics

totp authenticator google-authenticator two-factor-authentication 2fa

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