OpenSC - Open source smart card tools and middleware. PKCS#11/MiniDriver/Tokend

OpenSC provides a set of libraries and utilities to work with smart cards. Its main focus is on cards that support cryptographic operations and facilitate their use in security applications such as authentication, mail encryption and digital signatures. OpenSC implements the PKCS11 API so applications supporting this API (such as Mozilla Firefox and Thunderbird) can use it. On the card OpenSC implements the PKCS15 standard and aims to be compatible with every software/card that supports it.