Encrypt a super secret message.

AesEncrypt.java

// Get the AndroidKeyStore instance
KeyStore keyStore = KeyStore.getInstance("AndroidKeyStore");

// Relict of the JCA API - you have to call load even
// if you do not have an input stream you want to load or it'll crash
keyStore.load(null);

// Get the SecretKey from the KeyStore and instantiate a Cipher
SecretKey secretKey = 
    (SecretKey) keyStore.getKey("myAwesomeSecretKey01", null);
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");

// Init the Cipher and encrypt the plaintext
cipher.init(Cipher.ENCRYPT_MODE, secretKey);
byte[] encryptedBytes = 
    cipher.doFinal("This is a super secret message".getBytes());