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Format: [ "Version" uint16 big endian ] [ "Id" 16 random bytes ]
Quoting SECURITY.md:
* Every file has a header that contains a 16-byte random *file id*
* Each block uses the file id and its block number as GCM *authentication data*
* This means the position of the blocks is protected as well. The blocks
can not be reordered or copied between different files without
causing an decryption error.
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...also adapt the cryptfs tests for 256 bit long keys
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"Offset" is unclear whether it is an offset from the start of file
or start of block. "Skip" seems much better.
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Also, fix key, it is now []byte, not [16]byte
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