README.md

IAB Tech Lab Supply Chain Plus API Hash Usage

Prerequisites:

1. Python 3: Ensure you have Python 3 installed on your machine. You can verify this by running “python --version” in the command prompt or terminal. If Python 3 is not installed, download it from Python.org.

2. Required Libraries: Make sure you have the crc32c and base64 libraries installed. These are usually included in standard Python installations, but if they are not present, you can install them using ”pip install crc32c base64”.

Running the Code:

1. Save the Code: Save the provided Python code (with chunk reading) as a .py file. You can name it something like calculate_crc32c.py. Download from Github

2. Open Command Prompt or Terminal: Open a command prompt or terminal window.

3. Navigate to File Directory: Use the cd command to navigate to the directory where you saved the Python file.

4. Run the Script: Execute the following command: python calculate_crc32c.py

5. Provide File Path: The script will prompt you to enter the file path for which you want to calculate the CRC32C checksum. Provide the absolute or relative path to the file.

6. Get the Result: After providing the file path, the script will calculate the CRC32C checksum and print the Base64-encoded result.

Hash Matching:

Compare the hash provided by the server with the hash generated by following the above steps. If they match, the file has been successfully verified.