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Rust program to generate a random password using a given set of characters

Rust | Random Numbers Examples: Write a program to generate a random password using a given set of characters.
Submitted by Nidhi, on November 13, 2021

Problem Solution:

In this program, we will generate a random password using a given set of characters and print generated password.

Add random external library to your project

1. Create your project using the below command.
   

   $cargo new random --bin

2. Goto the project folder cd random and edit Cargo.toml file.
   

   $random>nano Cargo.toml

3. Then add dependency in Cargo.toml file
   

   [dependencies]
   rand = "0.5.5"

4. After that, build your project using the below command
   

   $random>cargo build

5. Then execute your project after modification in the src/main.rs source file.
   

   $random>cargo run

Program/Source Code:

The source code to generate a random password using a given set of characters is given below. The given program is compiled and executed on UBUNTU 18.04 successfully.

// Rust program to generate a random password 
// using given set of characters.
fn main() {
    use rand::Rng;
    const CHAR_SET: &[u8] = b"abcdefghijklmnopqrstuvwxyz\
        ABCDEFGHIJKLMNOPQRSTUVWXYZ\
        0123456789(~!@#$%^&*)";
    
    const PWD_LEN: usize = 10;
    let mut rnd = rand::thread_rng();

    let password: String = (0..PWD_LEN)
        .map(|_| {
            let idx = rnd.gen_range(0,CHAR_SET.len());
            CHAR_SET[idx] as char
        })
        .collect();

    println!("Generated password: {:?}", password);
}

Output:

$random> cargo run
Finished dev [unoptimized + debuginfo] target(s) in 0.00s
     Running `target/debug/random`

Generated password: "MNe2&TMjlf"

Explanation:

In the above program, we imported the "rand" library to our project for generating random numbers. We imported the "rand" library using the below line:

use rand::Rng;

In the main() function, we generated a random password using a given set of characters with the help of "rand" library functions and printed the result.

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