This is a sample Applet based on the Java Card standard platform that combines a cold wallet with a BIP. Before using this example, there are some prerequisites

• Card Support: You should use Java Card that supports Java Card framwork version 3.0.4 (or above), globalplatform version 2.2.1 (or above), and UICC API for Java Card
• Server: If you want to use the BIP channel as a communication medium, you should create a Server yourself as the entity that communicates with Java Card
• File system: According to your implementation, you should create your own file system for your Applet to save relevant sensitive data, such as: IP address, key, etc.

Convert cap files using any tool that can load and manage applets on JavaCard (e.g GlobalPlatformPro)

The file structure used in this example is:

• MF_3F00
  • DF_BIP
    • EF_CARD_ID
    • EF_BIP_IP
    • EF_BIP_Port
  • DF_COLDWALLET
    • EF_MENU_MNEMONICWORD
    • EF_LanguageName
    • EF_MenuWording1
    • EF_MenuWording2
    • EF_MenuWording3
    • EF_MenuWording4

The elliptic curve algorithm scalar multiplied by a given point in this example is suitable for SIMoME series cards of Taisys. For details, please refer to SECP256k1

This work is licensed under GPLv3 License. See LICENSE for details.

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