         let data = Data(bytes: bytes)
         do {
             // If we encrypt it
-            let encryptedData = try CryptoHelperTests._cryptoHelper.encryptData(data)
+            let encryptedData = try CryptoHelperTests._cryptoHelper.encryptData(data,useKey:TestsConfiguration.KEY)
             // we get an encrypted buffer
             // If we decrypt it
-            let decryptedData = try CryptoHelperTests._cryptoHelper.decryptData(encryptedData)
+            let decryptedData = try CryptoHelperTests._cryptoHelper.decryptData(encryptedData,useKey:TestsConfiguration.KEY)
             // we get back our original string
             XCTAssertEqual(data, decryptedData)
         } catch {

        let string = "martin"
        do {
            // If we encrypt it
            let encryptedString = try CryptoHelperTests._cryptoHelper.encryptString(string)
            // If we decrypt it
            let decryptedString = try CryptoHelperTests._cryptoHelper.decryptString(encryptedString)
            // we get back our original string
            XCTAssertEqual(decryptedString, "martin")
        } catch {

        let string = Bartleby.randomStringWithLength(512, signs: "{'èç')à')\"'$$€${}!12673hdazuodazdhudzaohudzo  ≈")
        do {
            // If we encrypt it
            let encryptedData = try CryptoHelperTests._cryptoHelper.encryptStringToData(string,useKey:TestsConfiguration.KEY)
            // If we decrypt it
            let decryptedString = try CryptoHelperTests._cryptoHelper.decryptStringFromData(encryptedData,useKey:TestsConfiguration.KEY)
            // we get back our original string
            XCTAssertEqual(decryptedString, string)
        } catch {
