Create Chained Operations

To create a chained encryption operation:

1. Set the IVs you'll need for the encryption.

2. Obtain an instance of a chained cipher.

3. Create a ChainedOperations object.

4. Use addEncrypt() to add the encryption operations to the ChainedOperations object. Specify the key name, padding, and IvParameterSpec object.

5. Use the seal() method to seal the ChainedOperations object.

6. Initialize the Cipher object, pass the ChainedOperations object as a parameter. For all chained operations, the first argument of cipher.init is ignored.

7. Perform the operations by calling the doFinal() method on the Cipher object. Pass the bytes of data you want to encrypt.

Code sample

The following code sample demonstrates how to encrypt Hello World! with mykey1 and then encrypt the result with mykey2.

byte[] iv = ... /* set iv byte array to 16 byte value of the IV for mykey1 */
byte[] iv2 = ... /* set iv byte array to 16 byte value of the IV for mykey2 */
Cipher cipher = Cipher.getInstance("ChainedCipher");
ChainedOperations ops = new ChainedOperations();
ops.addEncrypt(NAEKey.getSecretKey("mykey1"), "AES/CBC/PKCS5Padding",
new IvParameterSpec(iv));
ops.addEncrypt(NAEKey.getSecretKey("mykey2"), "AES/CBC/PKCS5Padding", newIvParameterSpec(iv2));
ops.seal();
cipher.init(Cipher.ENCRYPT_MODE, ops);
byte[] ciphertext = cipher.doFinal("Hello World!".getBytes());