CipherInputStream and CipherOutputStream dont work properly together

 CipherInputStream and CipherOutputStream do not work in Unison. I read in
> an input file, encrypted and wrote it out using CipherOutputStream. Then
> I read this encrypted file using a CipherInputStream in decryption mode
> and wrote out the decrypted file as plain text. I then compare this last
> file with the orignally encrypted file and found that in many places the
> contents were different. The contents were similar also in many places.
> It may be either a problem with writing it out or reading it back in.
>