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Ferdinand Thiessen b624df9d27 fix(encryption): use the block size of the file encoding when fixing sizes
`fixUnencryptedSize()` asked the encryption module for the unencrypted
block size before calling `begin()`. The module only learns the encoding
of the file (binary or legacy base64) from the header in `begin()`, so
the block size of binary encoded files was used for legacy base64 files.

This stored an inflated unencrypted size for legacy files, which then
breaks downloads: the announced content length is too large and the
signature check of the last block fails with "Bad Signature".

Fixes #63662

Assisted-by: ClaudeCode:claude-opus-5-5
Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>
2026-10-12 16:29:35 +02:00
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