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async function decrypt(fileName){
  const decryptParams = new Virtru.DecryptParamsBuilder()  // Changed to 'decryptParams'
    .withFileSource(`./decrypt-in/${fileName}`)
    .build();
  const stream = await client.decrypt(decryptParams);      // Changed to 'client.decrypt'
                                                           // Decrypt to stream

  // Naming logic
  var i = 1;
  var array = fileName.split('.');

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  var i = 1;
  var array = fileName.split('.');
  var encryptFileName = `${array[0]}.${array[1]}.tdf3.html`;
  while (fs.existsSync(`./encrypt-out/${encryptFileName}`)) {
    encryptFileName = `${array[0]} (${i}).${array[1]}.tdf3.html`;
    i++;
  }

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  var i = 1;
  var array = fileName.split('.');
  var encryptFileName = `${array[0]}.${array[1]}.tdf3.html`;
  while (fs.existsSync(`./encrypt-out/${encryptFileName}`)) {
    encryptFileName = `${array[0]} (${i}).${array[1]}.tdf3.html`;
    i++;
  }

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/*
 * Encryption function.
 *
 * @param {string} fileName Name of the file to encrypt.
 */
async function encrypt(fileName){
  const encryptParams = new Virtru.EncryptParamsBuilder()
    .withFileSource(`./encrypt-in/${fileName}`)
    .withDisplayfileName(fileName)
    .build();

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/*
 * Encryption function.
 *
 * @param {string} fileName Name of the file to encrypt.
 */
async function encrypt(fileName){
  const encryptParams = new Virtru.EncryptParamsBuilder()
    .withFileSource(`./encrypt-in/${fileName}`)
    .withDisplayfileName(fileName)
    .build();

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  var i = 1;
  var array = fileName.split('.');
  var decryptFileName = `${array[0]}.${array[1]}`;
  while (fs.existsSync(`./decrypt-out/${decryptFileName}`)) {
    decryptFileName = `${array[0]} (${i}).${array[1]}`;
    i++;
  }

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...        
        var fileName = file.name;
        // Assign a unique name (uFileName) to each file (fileName
        // + randnum)to ensure client will not attempt to use same
        //set of keys for multiple files of the same name.
        var uFileName = `${fileName}|${Math.random()}`;
        // Set temporary storage location in /tmp/
        var dest = fs.createWriteStream(`/tmp/${uFileName}`);
...

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...
        var dest = fs.createWriteStream(`/tmp/${uFileName}`);  // download encrypted content to /tmp
        drive.files.get({
          fileId: fileId,
          alt: 'media'
        }, {
          responseType: 'stream'
        }...
...

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drive.files.list({
  fields: 'nextPageToken, files(id, name)',
  q: `'${folderId}' in parents and name contains "tdf3.html" and trashed = false`
}, (err, res) => {
  if (err) return console.log('The API returned an error: ' + err);
  // Generate list of files.
  const files = res.data.files;
  if (files.length) {
    files.map((file) => {
      // Get name and ID of each file.

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async function encrypt(fileName, auth){
  const encryptParams = new Virtru.EncryptParamsBuilder()
    .withFileSource(`./encrypt-in/${fileName}`)
    .withDisplayFilename(fileName)
    .build();
  ct = await client.encrypt(encryptParams);
  var ctString = await ct.toString();

  const drive = google.drive({version: 'v3', auth});