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-rw-r--r--lib/private/files/storage/wrapper/encryption.php6
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/private/files/storage/wrapper/encryption.php b/lib/private/files/storage/wrapper/encryption.php
index 3e980984191..09ba090acff 100644
--- a/lib/private/files/storage/wrapper/encryption.php
+++ b/lib/private/files/storage/wrapper/encryption.php
@@ -219,6 +219,12 @@ class Encryption extends Wrapper {
$size = $unencryptedSize = 0;
if ($this->file_exists($path)) {
+ // in case the file exists we require the explicit module as
+ // specified in the file header - otherwise we need to fail hard to
+ // prevent data loss on client side
+ if (!empty($encryptionModuleId)) {
+ $encryptionModule = $this->encryptionManager->getEncryptionModule($encryptionModuleId);
+ }
$size = $this->storage->filesize($path);
$unencryptedSize = $this->filesize($path);
}