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expand on the chunk id hash mechanism

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according to @ThomasWaldmann, the algorithm varies according to whether encryption is enabled.
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anarcat 2015-03-05 08:48:23 -05:00
parent 8f8a035e93
commit 87cb4a4813
1 changed files with 2 additions and 2 deletions
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docs/internals.rst
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@ -138,8 +138,8 @@ into deduplicated chunks. The reference to these chunks is then added
to the archive metadata. This allows the archive to store many files,
beyond the ``MAX_OBJECT_SIZE`` barrier of 20MB.
A chunk is an object as well, of course, and its id is the hash of its
(unencrypted and uncompressed) content.
A chunk is an object as well, of course. The chunk id is either
HMAC-SHA256_, when encryption is used, or a SHA256_ hash otherwise.
Hints are stored in a file (``repo/hints``) and contain: