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docs/data structures: add chunk layout diagram

This commit is contained in:
Marian Beermann 2017-05-21 16:36:50 +02:00
parent 8268090f8e
commit 73123578ed
3 changed files with 4 additions and 3 deletions
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7
docs/internals/data-structures.rst
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@ -451,9 +451,10 @@ Encryption
AES_-256 is used in CTR mode (so no need for padding). A 64 bit initialization
vector is used, a MAC is computed on the encrypted chunk
and both are stored in the chunk.
The header of each chunk is: ``TYPE(1)`` + ``MAC(32)`` + ``NONCE(8)`` + ``CIPHERTEXT``.
Encryption and MAC use two different keys.
and both are stored in the chunk. Encryption and MAC use two different keys.
Each chunk consists of ``TYPE(1)`` + ``MAC(32)`` + ``NONCE(8)`` + ``CIPHERTEXT``:
.. figure:: encryption.png
In AES-CTR mode you can think of the IV as the start value for the counter.
The counter itself is incremented by one after each 16 byte block.

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