files_load_unique_data: fix unique data copy to ecc point #3331
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Split of unique data into x and y components of ecc point currently fumbles the indexes leading to incomplete copy. Using "IAK" (size=3) as input, this leads to: > x.size = (unique_size / 2) = 1 > x.buffer = unique_size[0,1[ = ['I'] > y.size = (unique_size / 2) + (unique_size % 2) = 2 > y.buffer = unique_size[1,2[ + 0 = ['A', 0] Change copy bounds to copy "bigger" first half in x and remainder in y to reach a more reasonable result: > x.size = (unique_size / 2) + (unique_size % 2) = 2 > x.buffer = unique_size[0,2[ = ['I', 'A'] > y.size = (unique_size / 2) + (unique_size % 2) = 2 > y.buffer = unique_size[2,3[ + 0 = ['K', 0] Signed-off-by: Julien Gomes <julien@arista.com>
Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## master #3331 +/- ##
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- Coverage 74.38% 74.38% -0.01%
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Files 173 173
Lines 23673 23672 -1
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- Hits 17610 17609 -1
Misses 6063 6063 ☔ View full report in Codecov by Sentry. |
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I think this makes a lot of sense. BUT, this looks like a change in behavior, i.e. different key derivation and such. @williamcroberts Your thoughts ? |
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Split of unique data into x and y components of ecc point currently fumbles the indexes leading to incomplete copy.
Using "IAK" (size=3) as input, this leads to:
Change copy bounds to copy "bigger" first half in x and remainder in y to reach a more reasonable result: