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test_chunkpoints_unchanged: do not use blake2b_256

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we want to get rid of legacy stuff(*) one day and sha256 is as
good for this purpose (and might be even hw accelerated).

(*) considered legacy due to the way it gives the key to the
blake2b function (just padding and prepending it to the data,
instead of using the key parameter, see #8867 ).
This commit is contained in:
Thomas Waldmann 2025-05-29 16:38:53 +02:00
parent 04000f7fed
commit 6841897692
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1 changed files with 9 additions and 5 deletions
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14
src/borg/testsuite/chunker_slow_test.py
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@ -1,12 +1,16 @@
from hashlib import sha256
from io import BytesIO
from .chunker_test import cf
from ..chunker import Chunker
from ..crypto.low_level import blake2b_256
from ..constants import * # NOQA
from ..helpers import hex_to_bin
def H(data):
return sha256(data).digest()
def test_chunkpoints_unchanged():
def twist(size):
x = 1
@ -28,10 +32,10 @@ def test_chunkpoints_unchanged():
for seed in (1849058162, 1234567653):
fh = BytesIO(data)
chunker = Chunker(seed, minexp, maxexp, maskbits, winsize)
chunks = [blake2b_256(b"", c) for c in cf(chunker.chunkify(fh, -1))]
runs.append(blake2b_256(b"", b"".join(chunks)))
chunks = [H(c) for c in cf(chunker.chunkify(fh, -1))]
runs.append(H(b"".join(chunks)))
# The "correct" hash below matches the existing chunker behavior.
# Future chunker optimisations must not change this, or existing repos will bloat.
overall_hash = blake2b_256(b"", b"".join(runs))
assert overall_hash == hex_to_bin("b559b0ac8df8daaa221201d018815114241ea5c6609d98913cd2246a702af4e3")
overall_hash = H(b"".join(runs))
assert overall_hash == hex_to_bin("a43d0ecb3ae24f38852fcc433a83dacd28fe0748d09cc73fc11b69cf3f1a7299")