Speed up encryption/decryption?

Question

I have an encryption and decryption code which I use to encrypt and decrypt video files (mp4). I\'m trying to speed up the decryption process as the encryption one is not th

Answer 1

Why are you decrypting data only by blockSize increments ? You do not show what type of object cipher is, but I am guessing this is a javax.crypto.Cipher instance. It can handle update() calls over arrays of arbitrary length, and you will have much less overhead if you use longer arrays. You should process data by blocks of, say, 8192 bytes (that's the traditional length for a buffer, it interacts reasonably well with CPU inner caches).