wpa_passphrase.js

#!/usr/bin/env node
// wpa_passphrase - Generate a WPA PSK from an ASCII passphrase for a SSID
// usage: wpa_passphrase <ssid> [passphrase]

const crypto = require('crypto');

if (process.argv.length < 3 || process.argv.length > 4) {
    console.error('usage: wpa_passphrase <ssid> [passphrase]');
    process.exit(1);
}

const ssid = process.argv[2];

if (process.argv.length == 4) {
    psk(ssid, process.argv[3]);
}
else {
    const readline = require('readline');
    const rl = readline.createInterface({
        input: process.stdin,
        output: process.stdout
    });
    rl.question("passphrase: ", function(passphrase) {
        console.log('');
        psk(ssid, passphrase);
        rl.close();
    });
    rl._writeToOutput = function _writeToOutput(c) {
        // rl.output.write("*");
    };
}

function psk(ssid, passphrase) {
    const psk = crypto.pbkdf2Sync(passphrase, ssid, 4096, 32, 'sha1')
                .toString('hex');
    console.log(`network={\n\tssid="${ssid}"\n\tpsk=${psk}\n}`);
}