Android Keystore In this post we will learn how to store a key in android provider keystore and encrypt and decrypt. Keystore KeyStore ks = KeyStore.getInstance("AndroidKeyStore"); SecretKey key = new SecretKeySpec(keyByte, alg); KeyStore.SecretKeyEntry secretKeyEntry = new KeyStore.SecretKeyEntry(key); // store key in keystore ks.setEntry( "keyName", new KeyStore.SecretKeyEntry(secretKeyEntry.getSecretKey()), new KeyProtection.Builder(KeyProperties.PURPOSE_ENCRYPT | KeyProperties.PURPOSE_DECRYPT) .setBlockModes(KeyProperties.BLOCK_MODE_GCM) .setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_NONE) .build()); // get key from key store SecretKey keyStoreKey = (SecretKey) ks.getKey(" keyName", null); Encryption Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding"); cipher.init(Cipher.ENCRYPT_MODE, keyStoreKey); byte[] encryptedByte = c...