var ursa = require('ursa');
  var fs = require('fs');
  

  var DecryptServ = {

      decrypter: false,

      whenOk: function (cb) {
          if (this.encrypter) {
              cb();
          } else {
              this.prepare(cb);

          }

      },

      prepare: function (cb) { // TODO Juste charger au lancement du script
          fs.readFile('config/ci_com.pem', function (err, data) {
              if (err) {
                  throw err;
              }
              this.decrypter = ursa.createPrivateKey(data);
              cb();
          });
      },
  
      preload: function (cb) {
          this.whenOk(cb);
      },

      decrypt: function (string, cb) {
          this.whenOk(function () {
              cb(this.decrypter.decrypt(string, 'base64', 'utf8', ursa.RSA_PKCS1_PADDING));
          });
      }

  };
  

  module.exports = DecryptServ;