send-secure-msg.rs

/*
Example demonstrating Sending a Secure Message.

*/

// ------------------------------------------
// crates.io
// ------------------------------------------
#[macro_use]
extern crate serde_json;


// ------------------------------------------
// hyperledger crates
// ------------------------------------------
extern crate indyrs as indy;                      // rust wrapper project

use std::io::Write;
use std::io;
use std::fs::File;
use std::io::prelude::*;
use std::str;

use indy::did;
use indy::future::Future;
use indy::wallet;
use indy::crypto;

static USEFUL_CREDENTIALS: &'static str = r#"{"key": "12345678901234567890123456789012"}"#;
static FILE: &'static str = "message.txt";

fn main() {
    let (wallet_handle, verkey, other_verkey) = init();

    loop {
        println!("ToDo");

        let mut cmd = String::new();
        io::stdin().read_line(&mut cmd).unwrap();
        cmd = cmd.trim().to_string();

        if cmd == "prep" {
            prep(wallet_handle, &verkey, &other_verkey);
        } else if cmd == "read" {
            read(wallet_handle, &verkey);
        } else if cmd == "quit" {
            break;
        } else {
            println!("wrong")
        }
    }
}

fn init() -> (i32, String, String) {
    let mut cmd = String::new();

    println!("Who are you? ");
    io::stdin().read_line(&mut cmd).unwrap();

    let config = json!({ "id" : format!("{}-wallet", cmd) }).to_string();
    wallet::create_wallet(&config, USEFUL_CREDENTIALS).wait().unwrap();
    let wallet_handle: i32 = wallet::open_wallet(&config, USEFUL_CREDENTIALS).wait().unwrap();

    let (did, verkey) = did::create_and_store_my_did(wallet_handle, "{}").wait().unwrap();
    println!("My DID and Verkey: {} {}", did, verkey);

    println!("Other party's DID and Verkey? ");
    let mut other = String::new();
    io::stdin().read_line(&mut other).unwrap();
    let other_verkey = other.trim().split(" ").collect::<Vec<&str>>()[1].trim().to_string();

    (wallet_handle, verkey, other_verkey)
}

fn prep(wallet_handle: i32, sender_vk: &str, receipt_vk: &str) {
    let mut file = File::create(FILE).unwrap();

    println!("Enter message");
    let mut message = String::new();
    io::stdin().read_line(&mut message).unwrap();

    let encrypted_msg = crypto::auth_crypt(wallet_handle, &sender_vk, &receipt_vk, message.trim().as_bytes()).wait().unwrap();
    file.write_all(&encrypted_msg).unwrap();
}

fn read(wallet_handle: i32, receipt_vk: &str) {
    let mut file = File::open(FILE).unwrap();

    let mut contents = Vec::new();
    file.read_to_end(&mut contents).unwrap();

    let (sender, decrypted_msg) = crypto::auth_decrypt(wallet_handle, &receipt_vk, &contents).wait().unwrap();
    println!("Sender Verkey: {:?}", sender);
    println!("Decrypted message: {:?}", str::from_utf8(&decrypted_msg).unwrap());
}