Simple Checksum
- It is a basic data integrity validation method. It generates a compact code to confirm if data is accurate, but it’s simple and limited in detecting errors.
- In this approach, we will make a function
simpleChecksumthat calculates a checksum by summing the ASCII values of characters in the input data. - Now iterates through each character and accumulates their ASCII values into the checksum variable.
- Now to ensure the checksum stays within the 0-255 range, it uses modulo arithmetic.
Example: In this example, we will see the implementation of the checksum algorithm by using a simple checksum.
Javascript
function simpleChecksum(data) { let checksum = 0; // Iterate through each character in the data for (let i = 0; i < data.length; i++) { // Add the ASCII value of // the character to the checksum checksum += data.charCodeAt(i); } // Ensure the checksum is within //the range of 0-255 by using modulo return checksum % 256;}const data = "w3wiki";const checksumValue = simpleChecksum(data);console.log("Simple Checksum: " + checksumValue); |
Output
Simple Checksum: 5
Checksum algorithms in JavaScript
Checksum algorithms are fundamental techniques used in data communication and storage to ensure the integrity of data. The primary purpose of a checksum algorithm is to generate a fixed-size value (the checksum) based on the content of a dataset. They are essential for detecting errors, unauthorized changes, or corruption in data during transmission, saving files, or other data-handling processes.
These are the following techniques for this:
Table of Content
- Simple Checksum
- CRC (Cyclic Redundancy Check)
- MD5 (Message Digest Algorithm 5)
- SHA-256 (Secure Hash Algorithm 256-bit)