CKC_CipherProblem.js

//db.js

createUserContainer: function(username, password, callback) {
    if (username && password) {
      var raw_message = 'BLG' + username;
      var fileString = __dirname + '/../user_data/' + username + '.blg';
      applib.hashMessage(raw_message, password, function(message) {
        fs.writeFile(fileString, message, function(err) {
          callback(err);
        })
      })
    }
  }

  verifyUserContainer: function(username, password, callback) {
    var container_path = __dirname + '/../user_data/' + username + '.blg';
    if (username && password) {
      fs.exists(container_path, function(exists) {
        if (exists) {
          var expected_message = 'BLG' + username;
          module.exports.readLine(container_path, 'utf8', 1, function(line) {
            applib.decryptMessage(line.toString(), password, function(message) {
              if (message == expected_message) {
                callback(true)
              }
              else {
                callback(false);
              }
            })
          })
        }
        else {
          callback(false);
        }
      })
      
    }
  }


// applib.js

 hashMessage: function(message, password, callback) {
    var hash_algorithm = 'aes256';
    var cipher = crypto.createCipher(hash_algorithm, password);
    var encrypted = cipher.update(message, 'utf8', 'hex') + cipher.final('hex');
    callback(encrypted);
  }

  decryptMessage: function(ciphertext, password, callback) {
    var hash_algorithm = 'aes256';
    var decipher = crypto.createDecipher(hash_algorithm, password);
    var decrypted = decipher.update(ciphertext, 'hex','utf8') + decipher.final('utf8');
    callback(decrypted);
  }