PSK Client

This is a simple wrapper around the PSK functionality exposed by the openssl crate. PR's to make this more generic, useable and informative (in terms of errors) are more than welcome.

Features

PSK Client has one feature which is openssl-vendored which simply enables the vendored feature on the openssl crate, for further information, see the openssl-rs docs.

Usage

use psk_client::{PskClient, error::PskClientError};

fn main() -> Result<(), PskClientError> {
    let client = PskClient::builder("127.0.0.1:4433")
        .reset_ciphers()
        .cipher("PSK-AES128-CBC-SHA")
        .cipher("PSK-AES256-CBC-SHA")
        .identity("Client_identity")
        .key("4836525835726d466c743469426c55356e377375436254566d51476937724932")
        .build()?;

    let mut connection = client.connect()?;

    if let Err(msg) = connection.write_all(b"Hello, World!") {
        eprintln!("Error writing to client: {}", msg);
    }

    Ok(())
}

A key may also be retrieved from a file (or anything implementing Read), like so:

use psk_client::{PskClient, error::PskClientError};
use std::fs::File;

fn main() -> Result<(), PskClientError> {
    let key_file = File::open("/some/path/to/psk.key").unwrap();
    
    let client = PskClient::builder("127.0.0.1:4433")
        .identity("Client_identity")
        .key_from(key_file)?
        .build()?;
    
    let mut connection = client.connect()?;

    if let Err(msg) = connection.write_all(b"Hello, World!") {
        eprintln!("Error writing to client: {}", msg);
    }

    Ok(())
}

Default Ciphers

By default the client will use the following ciphers, this can be cleared by calling reset_ciphers() on a PskClientBuilder. You can supply your own ciphers, either after clearing the pre-defined cipers, or in addition to them by calling cipher("<cipher>") on a PskClientBuilder as shown in the first example above.

• RSA-PSK-AES256-GCM-SHA384
• DHE-PSK-AES256-GCM-SHA384
• RSA-PSK-CHACHA20-POLY1305
• DHE-PSK-CHACHA20-POLY1305
• DHE-PSK-AES256-CCM8
• DHE-PSK-AES256-CCM
• PSK-AES256-GCM-SHA384
• PSK-CHACHA20-POLY1305
• PSK-AES256-CCM8
• PSK-AES256-CCM
• RSA-PSK-AES128-GCM-SHA256
• DHE-PSK-AES128-GCM-SHA256