README.md

# AES Cryptolite

This code example demonstrates the implementation of Cryptolite AES algorithm and how to encrypt and decrypt data using the CTR and CFB modes.

[View this README on GitHub.](https://github.com/Infineon/mtb-example-cyw20829-cryptolite-aes)

[Provide feedback on this code example.](https://cypress.co1.qualtrics.com/jfe/form/SV_1NTns53sK2yiljn?Q_EED=eyJVbmlxdWUgRG9jIElkIjoiQ0UyMjM1NDEiLCJTcGVjIE51bWJlciI6IjAwMi0yMzU0MSIsIkRvYyBUaXRsZSI6IkhBTDogSGVsbG8gd29ybGQiLCJyaWQiOiJraGF0cmluYXZpbmsiLCJEb2MgdmVyc2lvbiI6IjQuNS4wIiwiRG9jIExhbmd1YWdlIjoiRW5nbGlzaCIsIkRvYyBEaXZpc2lvbiI6Ik1DRCIsIkRvYyBCVSI6IklDVyIsIkRvYyBGYW1pbHkiOiJQU09DIn0=)

## Requirements

- [ModusToolbox™](https://www.infineon.com/modustoolbox) v3.0 or later (tested with v3.0)
- Board support package (BSP) minimum required version:
  - CYW920829M2EVK-02: v1.0.1
- Programming language: C
- Associated parts: All [AIROC™ CYW20829 Bluetooth® LE SoC](https://www.infineon.com/cms/en/product/promopages/airoc20829)


## Supported toolchains (make variable 'TOOLCHAIN')

- GNU Arm® Embedded Compiler v10.3.1 (`GCC_ARM`) – Default value of `TOOLCHAIN`
- Arm® Compiler v6.16 (`ARM`)
- IAR C/C++ Compiler v9.30.1 (`IAR`)


## Supported kits (make variable 'TARGET')

- [AIROC™ CYW20829 Bluetooth® LE evaluation Kit](https://www.infineon.com/CYW920829M2EVK-02) (`CYW920829M2EVK-02`) – Default value of `TARGET`

## Hardware setup

This example uses the board's default configuration. See the kit user guide to ensure that the board is configured correctly.

> **Note:** The AIROC™ CYW20829 Bluetooth® Kit (CYW920829M2EVK-02) ships with KitProg3 installed. ModusToolbox™ requires KitProg3. Before using this code example, make sure that the board is upgraded to KitProg3. The tool and instructions are available in the [Firmware Loader](https://github.com/Infineon/Firmware-loader) GitHub repository. If you do not upgrade, you will see an error like "unable to find CMSIS-DAP device" or "KitProg firmware is out of date".


## Software setup

See the [ModusToolbox™ tools package installation guide](https://www.infineon.com/ModusToolboxInstallguide) for information about installing and configuring the tools package.

Install a terminal emulator if you don't have one. Instructions in this document use [Tera Term](https://ttssh2.osdn.jp/index.html.en).

This example requires no additional software or tools.


## Using the code example

### Create the project

The ModusToolbox™ tools package provides the Project Creator as both a GUI tool and a command line tool.

<details><summary><b>Use Project Creator GUI</b></summary>

1. Open the Project Creator GUI tool.

   There are several ways to do this, including launching it from the dashboard or from inside the Eclipse IDE. For more details, see the [Project Creator user guide](https://www.infineon.com/ModusToolboxProjectCreator) (locally available at *{ModusToolbox&trade; install directory}/tools_{version}/project-creator/docs/project-creator.pdf*).

2. On the **Choose Board Support Package (BSP)** page, select a kit supported by this code example. See [Supported kits](#supported-kits-make-variable-target).

   > **Note:** To use this code example for a kit not listed here, you may need to update the source files. If the kit does not have the required resources, the application may not work.

3. On the **Select Application** page:

   a. Select the **Applications(s) Root Path** and the **Target IDE**.

   > **Note:** Depending on how you open the Project Creator tool, these fields may be pre-selected for you.

   b.	Select this code example from the list by enabling its check box.

   > **Note:** You can narrow the list of displayed examples by typing in the filter box.

   c. (Optional) Change the suggested **New Application Name** and **New BSP Name**.

   d. Click **Create** to complete the application creation process.

</details>

<details><summary><b>Use Project Creator CLI</b></summary>

The 'project-creator-cli' tool can be used to create applications from a CLI terminal or from within batch files or shell scripts. This tool is available in the *{ModusToolbox&trade; install directory}/tools_{version}/project-creator/* directory.

Use a CLI terminal to invoke the 'project-creator-cli' tool. On Windows, use the command-line 'modus-shell' program provided in the ModusToolbox&trade; installation instead of a standard Windows command-line application. This shell provides access to all ModusToolbox&trade; tools. You can access it by typing "modus-shell" in the search box in the Windows menu. In Linux and macOS, you can use any terminal application.

The following example clones the "[AES Cryptolite](https://github.com/Infineon/mtb-example-cyw20829-cryptolite-aes)" application with the desired name "AES Cryptolite" configured for the *CYW920829M2EVK-02* BSP into the specified working directory, *C:/mtb_projects*:

   ```
   project-creator-cli --board-id CYW920829M2EVK-02 --app-id mtb-example-cyw20829-cryptolite-aes --user-app-name AES Cryptolite --target-dir "C:/mtb_projects"
   ```


The 'project-creator-cli' tool has the following arguments:

Argument | Description | Required/optional
---------|-------------|-----------
`--board-id` | Defined in the <id> field of the [BSP](https://github.com/Infineon?q=bsp-manifest&type=&language=&sort=) manifest | Required
`--app-id`   | Defined in the <id> field of the [CE](https://github.com/Infineon?q=ce-manifest&type=&language=&sort=) manifest | Required
`--target-dir`| Specify the directory in which the application is to be created if you prefer not to use the default current working directory | Optional
`--user-app-name`| Specify the name of the application if you prefer to have a name other than the example's default name | Optional

> **Note:** The project-creator-cli tool uses the `git clone` and `make getlibs` commands to fetch the repository and import the required libraries. For details, see the "Project creator tools" section of the [ModusToolbox&trade; tools package user guide](https://www.infineon.com/ModusToolboxUserGuide) (locally available at {ModusToolbox&trade; install directory}/docs_{version}/mtb_user_guide.pdf).

</details>



### Open the project

After the project has been created, you can open it in your preferred development environment.


<details><summary><b>Eclipse IDE</b></summary>

If you opened the Project Creator tool from the included Eclipse IDE, the project will open in Eclipse automatically.

For more details, see the [Eclipse IDE for ModusToolbox&trade; user guide](https://www.infineon.com/MTBEclipseIDEUserGuide) (locally available at *{ModusToolbox&trade; install directory}/docs_{version}/mt_ide_user_guide.pdf*).

</details>


<details><summary><b>Visual Studio (VS) Code</b></summary>

Launch VS Code manually, and then open the generated *{project-name}.code-workspace* file located in the project directory.

For more details, see the [Visual Studio Code for ModusToolbox&trade; user guide](https://www.infineon.com/MTBVSCodeUserGuide) (locally available at *{ModusToolbox&trade; install directory}/docs_{version}/mt_vscode_user_guide.pdf*).

</details>


<details><summary><b>Keil µVision</b></summary>

Double-click the generated *{project-name}.cprj* file to launch the Keil µVision IDE.

For more details, see the [Keil µVision for ModusToolbox&trade; user guide](https://www.infineon.com/MTBuVisionUserGuide) (locally available at *{ModusToolbox&trade; install directory}/docs_{version}/mt_uvision_user_guide.pdf*).

</details>


<details><summary><b>IAR Embedded Workbench</b></summary>

Open IAR Embedded Workbench manually, and create a new project. Then select the generated *{project-name}.ipcf* file located in the project directory.

For more details, see the [IAR Embedded Workbench for ModusToolbox&trade; user guide](https://www.infineon.com/MTBIARUserGuide) (locally available at *{ModusToolbox&trade; install directory}/docs_{version}/mt_iar_user_guide.pdf*).

</details>


<details><summary><b>Command line</b></summary>

If you prefer to use the CLI, open the appropriate terminal, and navigate to the project directory. On Windows, use the command-line 'modus-shell' program; on Linux and macOS, you can use any terminal application. From there, you can run various `make` commands.

For more details, see the [ModusToolbox&trade; tools package user guide](https://www.infineon.com/ModusToolboxUserGuide) (locally available at *{ModusToolbox&trade; install directory}/docs_{version}/mtb_user_guide.pdf*).

</details>


## Operation

1. Connect the board to your PC using the provided USB cable through the KitProg3 USB connector.

2. Open a terminal program and select the KitProg3 COM port. Set the serial port parameters to '8N1' and '115200' baud.

3. Program the board using one of the following:

   <details><summary><b>Using Eclipse IDE</b></summary>

      1. Select the application project in the Project Explorer.

      2. In the **Quick Panel**, scroll down, and click **\<Application Name> Program (KitProg3_MiniProg4)**.
   </details>


   <details><summary><b>In other IDEs</b></summary>

   Follow the instructions in your preferred IDE.
   </details>


   <details><summary><b>Using CLI</b></summary>

     From the terminal, execute the `make program` command to build and program the application using the default toolchain to the default target. The default toolchain is specified in the application's Makefile but you can override this value manually:
      ```
      make program TOOLCHAIN=<toolchain>
      ```

      Example:
      ```
      make program TOOLCHAIN=GCC_ARM
      ```
   </details>

4. After programming, the application starts automatically. Confirm that the UART terminal displays the following:

   **Figure 1. Terminal output on program startup**

   ![](images/fig1.png)

5. Read the user's input message and if it exceeds the `MAX_MESSAGE_SIZE` limit, prompt the user to enter a new message that is within the limit.


6. Enter '1' to use AES CTR mode or '2' to use AES CFB mode. Then, the encryption and decryption takes place using the respective AES modes and the result is displayed on the UART terminal.

   **Figure 2. Terminal output asking the input for AES CTR mode or AES CFB mode**

   ![](images/fig2.png)

   **Figure 3. Terminal output showing AES CTR mode encryption and decryption**

   ![](images/fig3.png)

   **Figure 4. Terminal output showing AES CFB mode encryption and decryption**

   ![](images/fig4.png)

## Debugging


You can debug the example to step through the code.


<details><summary><b>In Eclipse IDE</b></summary>

Use the **\<Application Name> Debug (KitProg3_MiniProg4)** configuration in the **Quick Panel**. For details, see the "Program and debug" section in the [Eclipse IDE for ModusToolbox&trade; user guide](https://www.infineon.com/MTBEclipseIDEUserGuide).

> **Note:** **(Only while debugging)** On the CM4 CPU, some code in `main()` may execute before the debugger halts at the beginning of `main()`. This means that some code executes twice – once before the debugger stops execution, and again after the debugger resets the program counter to the beginning of `main()`. See [KBA231071](https://community.infineon.com/docs/DOC-21143) to learn about this and for the workaround.

</details>


<details><summary><b>In other IDEs</b></summary>

Follow the instructions in your preferred IDE.
</details>


## Design and implementation

The Arm&reg; Cortex&reg; CPU controls the slave EZI2C resource. The slave receives the packet from the Bridge Control Panel with the command to wakeup a device from Deep Sleep mode to active mode.


### Resources and settings
**Table 1. Application resources**

 Resource  |  Alias/object     |    Purpose
 :-------  | :------------     | :------------
 UART (HAL) |cy_retarget_io_uart_obj | UART HAL object used by Retarget-IO for the Debug UART port

<br>

## Related resources


Resources  | Links
-----------|----------------------------------
Code examples  | [Using ModusToolbox&trade;](https://github.com/Infineon/Code-Examples-for-ModusToolbox-Software) on GitHub
Device documentation | [AIROC&trade; CYW20829 Bluetooth&reg; LE SoC](https://www.infineon.com/cms/en/product/promopages/airoc20829)
Development kits | Select your kits from the [Evaluation board finder](https://www.infineon.com/cms/en/design-support/finder-selection-tools/product-finder/evaluation-board)
Libraries on GitHub | [core-lib](https://github.com/Infineon/core-lib) – Core library <br> [core-make](https://github.com/Infineon/core-make) – Core GNU make build system <br> [mtb-hal-cat1](https://github.com/Infineon/mtb-hal-cat1) – Hardware Abstraction Layer (HAL) library <br> [mtb-pdl-cat1](https://github.com/Infineon/mtb-pdl-cat1) – Peripheral Driver Library (PDL) <br> [retarget-io](https://github.com/Infineon/retarget-io) – Utility library to retarget STDIO messages to a UART port
Tools  | [ModusToolbox&trade;](https://www.infineon.com/modustoolbox) – ModusToolbox&trade; software is a collection of easy-to-use libraries and tools enabling rapid development with Infineon MCUs for applications rangingfrom wireless and cloud-connect systems, edge AI/ML, embedded sense and control, to wired USB connectivity using PSoC&trade;Industrial/IoT MCUs, AIROC&trade; Wi-Fi and Bluetooth&reg; connectivity devices, XMC&trade; Industrial MCUs, and EZ-USB&trade;/EZ-PD&trade; wired connectivity controllers. ModusToolbox&trade; incorporates a comprehensive set of BSPs, HAL, libraries, configuration tools, and provides support for industry-standard IDEs to fast-track your embedded application development.


<br>

## Other resources

Infineon provides a wealth of data at [www.infineon.com](https://www.infineon.com) to help you select the right device, and quickly and effectively integrate it into your design.


## Document history

Document title: *CE239652* – *AES Cryptolite*

 Version | Description of change
 ------- | ---------------------
 1.0.0   | New code example
<br>

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The Bluetooth&reg; word mark and logos are registered trademarks owned by Bluetooth SIG, Inc., and any use of such marks by Infineon is under license.

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