check.js

var crypto = require('crypto'),
    shasum = crypto.createHash('sha1');

var fs = require('fs');

function checkHex(hex) {
  console.log('searching for', hex);
  var buffer = '';
  var numLines = 0;
  var rs = fs.createReadStream('data/pwned-passwords-1.0.txt');
  rs.on('data', function(chunk) {
    var lines = (buffer + chunk).split(/\r?\n/g);
    buffer = lines.pop();
    for (var i = 0; i < lines.length; ++i) {
      if (lines[i] === hex) {
        console.log('MATCH', lines[i], hex);
      }
      ++numLines;
    }
  });
  rs.on('end', function() {
    console.log('Done searching numLines', numLines);
  });
}

process.stdin.setEncoding('utf8');

process.stdin.on('readable', () => {
  const chunk = process.stdin.read();
  if (chunk !== null) {
    const data = chunk.slice(0, chunk.length - 1);
    shasum.update(data);
    const hex = shasum.digest('hex');
    checkHex(hex.toUpperCase());
  }
});

process.stdin.on('end', () => {
  process.stdout.write('end');
});