oathgen

Oathgen is a command line HOTP and TOTP one-time password generator for BSD, Linux, Mac and Windows operating systems. The goal of oathgen is to be complete, standard and portable.

Oathgen is written in C++11. In order to build oathgen, you must use a C++11 compiler. See the build.sh script for the exact compiler options. Oathgen has been built on g++, clang++ and MSVC++ compilers, but other C++11 compilers may work too.

Oathgen uses the Crypto++ 8.0 library for hexadecimal and base32 decoding and HMAC-SHA1 and SHA2. Older versions of Crypto++ may not work due to a bug with base32 encoding

If you only want Google Authenticator functionality and like Go, you may try goathgen.

To learn more about oathgen, read my blog post.