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Merge pull request #2544 from enkore/docs/ids-chunklayout

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docs/data structures: add chunk layout diagram
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enkore 2017-05-21 17:46:01 +02:00 committed by GitHub
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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 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 vector is used, a MAC is computed on the encrypted chunk
and both are stored in the chunk. and both are stored in the chunk. Encryption and MAC use two different keys.
The header of each chunk is: ``TYPE(1)`` + ``MAC(32)`` + ``NONCE(8)`` + ``CIPHERTEXT``. Each chunk consists of ``TYPE(1)`` + ``MAC(32)`` + ``NONCE(8)`` + ``CIPHERTEXT``:
Encryption and MAC use two different keys.
.. figure:: encryption.png
In AES-CTR mode you can think of the IV as the start value for the counter. 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. The counter itself is incremented by one after each 16 byte block.

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