CardKit is a Go library and program for interacting with smartcards. The library can be divided into four categories:

• The card package contains utilities for formulating and parsing APDUs and interacting with smartcards via various drivers
• The piv package contains code for interacting with FIPS-201 PIV ("Personal Identity Verification") applets
• Utility packages, such as rsapad (which handles RSA padding separately from signing, a separation not normally provided by the Go crypto libraries), and the tlv package for parsing the smartcard Basic TLV format

Finally, a command line interface is provided for managing smartcards which use one of the above protocols