security/2fa 1.2.0nb59 NetBSD

2fa is a two-factor authentication agent.

"2fa -add name" adds a new key to the 2fa keychain with the given name. It prints a prompt to standard error and reads a two-factor key from standard input. Two-factor keys are short case-insensitive strings of letters A-Z and digits 2-7.

"2fa name" prints a two-factor authentication code from the key with the given name.

With no arguments, "2fa" prints two-factor authentication codes from all known time-based keys.

The default time-based authentication codes are derived from a hash of the key and the current time, so it is important that the system clock have at least one-minute accuracy.

The keychain is stored unencrypted in the text file "$HOME/.2fa".