Nico Weber 7a48d59727 LibPDF: Simplify AESV2 code a bit ...

- `encrypt()` will always fill a multiple of block size,
  `decrypt()` might produce less data. But other than that,
  the middle span isn't modified even though it's a reference.
  So pass the ByteBuffer to assign() (kind of like before 5998072f15,
  but pass-by-move())

- In the encryption code path, assign a single buffer for IV and data
  instead of awkwardly copying the data around later.

Thanks to CxByte for suggesting most of this!

No intentional behavior change.

2023-07-18 18:48:57 +02:00

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