SystemServices.kt

// Create and Save asymmetric key
keyStoreWrapper.createAndroidKeyStoreSymmetricKey("MASTER_KEY")
    
// Get key from keyStore
val masterKey = keyStoreWrapper.getAndroidKeyStoreSymmetricKey("MASTER_KEY")

// Creates Cipher with symmetric transformation and provides encrypt and decrypt functions
val cipher = CipherWrapper("AES/CBC/PKCS7Padding")
    
// Encrypt message  
val encryptedMessage = cipher.encrypt(message, masterKey)
  
// Decrypt message  
val decryptedMessage = cipher.decrypt(encryptedMessage, masterKey)

// Ooops, InvalidKeyException: no IV set when one expected