Cold Wallet Sample

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

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.

Usage

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

File system architecture

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

Notes

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

License

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

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