Day 14 | 30 Days of AI Prompts

Try it!

The program is embedded below via the Rust Playground. Before running, click the Stdin tab inside the embed and enter your message on the first line and your key on the second line.

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Description

A Rust CLI program that takes a message and a key and encrypts the message using XOR — a simple symmetric cipher where each byte of the message is XOR'd with the corresponding byte of the key (cycling the key if it's shorter than the message). The result is printed as a hex string. A good exercise for learning how Rust handles strings, iterators, and byte-level operations.

View the source code


					use std::io;

					

					fn main() {

					    println!("Enter the message to encrypt:");

					    let mut message = String::new();

					    io::stdin().read_line(&mut
					message).expect("Failed to read");

					    let message = message.trim_end();

					

					    println!("Enter the encryption key:");

					    let mut key = String::new();

					    io::stdin().read_line(&mut
					key).expect("Failed to read");

					    let key = key.trim_end();

					

					    if key.is_empty() {

					        eprintln!("Key cannot
					be empty.");

					        return;

					    }

					

					    let message_bytes = message.as_bytes();

					    let key_bytes = key.as_bytes();

					    let encrypted: Vec<u8> =
					message_bytes

					        .iter()

					        .enumerate()

					        .map(|(i, &b)| b ^
					key_bytes[i % key_bytes.len()])

					        .collect();

					

					    let hex: String = encrypted.iter().map(|b|
					format!("{:02x}", b)).collect();

					    println!("Encrypted (hex): {}", hex);

					}

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