CipherWrapper.kt

fun encrypt(data: String, key: Key?, useInitializationVector: Boolean = false): String {
    cipher.init(Cipher.ENCRYPT_MODE, key)

    var result = ""
    if (useInitializationVector) {
        val iv = cipher.iv
        val ivString = Base64.encodeToString(iv, Base64.DEFAULT)
        result = ivString + IV_SEPARATOR
    }
    val bytes = cipher.doFinal(data.toByteArray())
    result += Base64.encodeToString(bytes, Base64.DEFAULT)

    return result
}