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check: --verify-data does not need to decompress with new crypto modes

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This commit is contained in:
Thomas Waldmann 2022-07-20 14:53:50 +02:00
parent 9d6c98d9f9
commit b0db800b5a
1 changed files with 9 additions and 3 deletions
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12
src/borg/archive.py
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@ -21,7 +21,7 @@
from . import xattr
from .chunker import get_chunker, Chunk
from .cache import ChunkListEntry
from .crypto.key import key_factory
from .crypto.key import key_factory, AEADKeyBase
from .compress import Compressor, CompressionSpec
from .constants import * # NOQA
from .crypto.low_level import IntegrityError as IntegrityErrorBase
@ -1684,6 +1684,12 @@ def verify_data(self):
chunks_count_index = len(self.chunks)
chunks_count_segments = 0
errors = 0
# for the new crypto, derived from AEADKeyBase, we know that it checks authenticity on
# the crypto.low_level level - invalid chunks will fail to AEAD authenticate.
# for these key types, we know that there is no need to decompress the data afterwards.
# for all other modes, we assume that we must decompress, so we can verify authenticity
# based on the plaintext MAC (via calling ._assert_id(id, plaintext)).
decompress = not isinstance(self.key, AEADKeyBase)
defect_chunks = []
pi = ProgressIndicatorPercent(
total=chunks_count_index, msg="Verifying data %6.2f%%", step=0.01, msgid="check.verify_data"
@ -1714,7 +1720,7 @@ def verify_data(self):
chunk_data_iter = self.repository.get_many(chunk_ids)
else:
try:
self.key.decrypt(chunk_id, encrypted_data)
self.key.decrypt(chunk_id, encrypted_data, decompress=decompress)
except IntegrityErrorBase as integrity_error:
self.error_found = True
errors += 1
@ -1745,7 +1751,7 @@ def verify_data(self):
# from the underlying media.
try:
encrypted_data = self.repository.get(defect_chunk)
self.key.decrypt(defect_chunk, encrypted_data)
self.key.decrypt(defect_chunk, encrypted_data, decompress=decompress)
except IntegrityErrorBase:
# failed twice -> get rid of this chunk
del self.chunks[defect_chunk]