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keycard.status.im-old/source/api/applet_installation.md

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id title
applet_installation Preparing the card

Preparing the card

If you got a Keycard and you are integrating it in your project, you will most likely want to reset the applet status completely for testing purposes. This is done by reinstalling the applet, which can be accomplished using the Keycard Installer for Android.

Upgrading the applet is also accomplished with the installer and also involves deleting the current version. The latest version of the installer always ships with the latest version of the applet.

The installer has a simple interface, when you open it, you see a white screen and a few buttons. Select the operation you want to perform, then bring the card near to the NFC reader of your phone and wait until the operation is complete. Make sure NFC is turned on.

There are two operations used to install the applet. One is "Install Secure", which installs the applet without sending the INIT command, so the installed applet is not initialized. The other option is "Install with test PIN/PUK". This installs the applet and sets PIN to "000000", PUK to "123456789012" and Pairing Password to "KeycardTest". This second option is useful if you want to quickly test interaction without having to initialize the card in your application.

Card requirements

The Keycard applet can be installed not only on our cards, but on any card which meets the following requirements:

  • JavaCard 3.0.4 or later.
  • Cipher.ALG_AES_BLOCK_128_CBC_NOPAD
  • Cipher.ALG_AES_CBC_ISO9797_M2
  • KeyAgreement.ALG_EC_SVDP_DH_PLAIN
  • KeyAgreement.ALG_EC_SVDP_DH_PLAIN_XY (defined in JavaCard 3.0.5 but available on some 3.0.4 cards nonetheless)
  • KeyPair.ALG_EC_FP (generation of 256-bit keys)
  • MessageDigest.ALG_SHA_256
  • MessageDigest.ALG_SHA_512
  • RandomData.ALG_SECURE_RANDOM
  • Signature.ALG_AES_MAC_128_NOPAD
  • Signature.ALG_ECDSA_SHA_256

Best performance is achieved if the card supports:

  • Signature.ALG_HMAC_SHA_512

Keycard requires about 10kb of NVM. All allocations, instantiations and checks are performed at installation time, so if installation succeeds, the applet will work fine.