daisvke / ft_otp

A simple OTP program coded in C++

ft_otp

Description

This a program that allows you to store an initial password in file, and that is capable of generating a new one time password every time it is requested.

Commands

make
./ft_otp -<option> <file name>

◦ -g: The program receives as argument a hexadecimal key of at least 64 characters.
The program stores this key safely in a file called ft_otp.key,
which is encrypted with AES encryption using Crypto++.

◦ -k: The program generates a new temporary password based on the key
given as argument and prints it on the standard output.

// Check what TOTP code you should get
oathtool --totp -v $(cat key.hex)

• The one-time password is randomly generated by the HOTP algorithm (RFC 4226), and always contains the same format, i.e. 6 digits.

Documentation

• https://www.cryptopp.com/wiki/Advanced_Encryption_Standard
• https://www.ietf.org/rfc/rfc4226.txteee