Structured Card Query Language Interpreter is the project, that translates an SCQL command into Application Protocol Data Unit (APDU) call, as defined by ISO/IEC 7816-7 Interindustry commands for Structured Card Query Language (SCQL). Additionally, generated APDUs are sent to the Java Card Simulator via Socket.

scql-applet - is the project implementation of a database on a Java Smart Card Applet, defined by ISO/IEC 7816-7.

1. Make sure, that you have specified JC_HOME_TOOLS and JC_HOME_SIMULATOR variables, installed from Oracle's Java Card Development Kit Simulator and Java Card Development Kit Tools;

2. SCQL Interpreter project requires minimum Java 11+ version. Additionally, the project uses Gradle 8.2 with Kotlin DSL;

3. Clone repository and build the project by Gradle command.

   ./gradlew build

1. Inside the root path src/main/resources/ modify the command.scql with custom SCQL commands and run the project.
2. In the same folder, command_apdu.script will be generated.

After the APDU script was generated, the communication process establishes between a Java Card Simulator and the Interpreter. All communication is done via java.net.Socket and Java Card com.sun.javacard.apduio library.

Communication is going through localhost:9025.

Applet AID:

FFFFFFFFFF/0102

Select Applet APDU command:

0x00 0xA4 0x04 0x00 0x07 0xFF 0xFF 0xFF 0xFF 0xFF 0x01 0x02 0x7F