[3.6] bpo-31933: fix blake2 multi-byte params on big endian platforms (GH-4250)#4262
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…onGH-4250) All Blake2 params have to be encoded in little-endian byte order. For the two multi-byte integer params, leaf_length and node_offset, that means that assigning a native-endian integer to them appears to work on little-endian platforms, but gives the wrong result on big-endian. The current libb2 API doesn't make that very clear, and @sneves is working on new API functions in the GH issue above. In the meantime, we can work around the problem by explicitly assigning little-endian values to the parameter block. See BLAKE2/libb2#12. (cherry picked from commit dcfb0e3)
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@oconnor663 and @tiran: Backport status check is done, and it's a success ✅ . |
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Thanks, @tiran! |
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All Blake2 params have to be encoded in little-endian byte order. For
the two multi-byte integer params, leaf_length and node_offset, that
means that assigning a native-endian integer to them appears to work on
little-endian platforms, but gives the wrong result on big-endian. The
current libb2 API doesn't make that very clear, and @sneves is working
on new API functions in the GH issue above. In the meantime, we can work
around the problem by explicitly assigning little-endian values to the
parameter block.
See BLAKE2/libb2#12.
(cherry picked from commit dcfb0e3)
https://bugs.python.org/issue31933