code: function(privateKey, password) {
      // Errors
      if (!privateKey || !password) throw new Error('Missing argument !');
      if (!Helpers.isPrivateKeyValid(privateKey)) throw new Error('Private key is not valid !');
      // Processing
      let pass = derivePassSha(password, 20);
      let r = encrypt(privateKey, convert.hex2ua(pass.priv));
      // Result
      return {
          ciphertext: CryptoJS.enc.Hex.stringify(r.ciphertext),
          iv: convert.ua2hex(r.iv)
      };
  }
docs: Encode a private key using a password
  
  @param {string} privateKey - An hex private key
  @param {string} password - A password
  
  @return {object} - The encoded data