Exception: Bad Signature when downloading zip which was uploaded from mobile app

Steps to reproduce

  1. Upload zip file of 200 mb therrough mobile app (latest version)
  2. Downcload zip file from web UI

Expected behaviour

zip is valid

Actual behaviour

Server exception:

“reqId”:“vDOXf87RBmBiuxuWkcGB”,“level”:4,“time”:“February 22, 2021 08:16:02”,“remoteAddr”:“”,“user”:“thommie4”,“app”:“webdav”,“method”:“GET”,“url”:"/owncloud/remote.php/webd
av/Tina/Shared_Tina/threema-backup_2XSN644N_1613979735396_1.zip?downloadStartSecret=hr9qa8gi35m",“message”:“Exception: Bad Signature: {“Exception”:“OC\\HintException”,“Message
“:“Bad Signature”,“Code”:0,“Trace”:”#0 \/var\/www\/owncloud\/apps\/encryption\/lib\/Crypto\/Crypt.php(457): OCA\\Encryption\\Crypto\\Crypt->checkSignature()
\n#1 \/var\/www\/owncloud\/apps\/encryption\/lib\/Crypto\/Encryption.php(362): OCA\\Encryption\\Crypto\\Crypt->symmetricDecryptFileContent()\n#2 \/var\/www\/
owncloud\/lib\/private\/Files\/Stream\/Encryption.php(473): OCA\\Encryption\\Crypto\\Encryption->decrypt(*** sensitive parameters replaced ***)\n#3 \/var\/www\/own
cloud\/lib\/private\/Files\/Stream\/Encryption.php(289): OC\\Files\\Stream\\Encryption->readCache()\n#4 [internal function]: OC\\Files\\Stream\\Encryption->stream_
read()\n#5 \/var\/www\/owncloud\/apps\/files_external\/3rdparty\/icewind\/streams\/src\/Wrapper.php(55): fread()\n#6 \/var\/www\/owncloud\/apps\/files_ext
ernal\/3rdparty\/icewind\/streams\/src\/CallbackWrapper.php(96): Icewind\\Streams\\Wrapper->stream_read()\n#7 [internal function]: Icewind\\Streams\\CallbackWrapper->s
tream_read()\n#8 \/var\/www\/owncloud\/lib\/composer\/sabre\/http\/lib\/Sapi.php(112): stream_copy_to_stream()\n#9 \/var\/www\/owncloud\/lib\/composer\/sa
bre\/dav\/lib\/DAV\/Server.php(490): Sabre\\HTTP\\Sapi::sendResponse()\n#10 \/var\/www\/owncloud\/lib\/composer\/sabre\/dav\/lib\/DAV\/Server.php(253): S
abre\\DAV\\Server->invokeMethod()\n#11 \/var\/www\/owncloud\/lib\/composer\/sabre\/dav\/lib\/DAV\/Server.php(321): Sabre\\DAV\\Server->start()\n#12 \/var
\/www\/owncloud\/apps\/dav\/appinfo\/v1\/webdav.php(66): Sabre\\DAV\\Server->exec()\n#13 \/var\/www\/owncloud\/remote.php(165): require_once(’\/var\/www\/
ownclo…’)\n#14 {main}”,“File”:”\/var\/www\/owncloud\/apps\/encryption\/lib\/Crypto\/Crypt.php",“Line”:477}"}

Server configuration

Operating system:
ubuntu 18 lts
Web server:
apache 2.4
PHP version:
ownCloud version: (see ownCloud admin page)
Updated from an older ownCloud or fresh install:

Where did you install ownCloud from:
Signing status (ownCloud 9.0 and above):

Login as admin user into your ownCloud and access 
paste the results into https://gist.github.com/ and puth the link here.

The content of config/config.php:

Log in to the web-UI with an administrator account and click on
'admin' -> 'Generate Config Report' -> 'Download ownCloud config report'
This report includes the config.php settings, the list of activated apps
and other details in a well sanitized form.


If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your ownCloud installation folder

*ATTENTION:* Do not post your config.php file in public as is. Please use one of the above
methods whenever possible. Both, the generated reports from the web-ui and from occ config:list
consistently remove sensitive data. You still may want to review the report before sending.
If done manually then it is critical for your own privacy to dilligently
remove *all* host names, passwords, usernames, salts and other credentials before posting.
You should assume that attackers find such information and will use them against your systems.

List of activated apps:

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your ownCloud installation folder.

Are you using external storage, if yes which one: local/smb/sftp/…
Are you using encryption: yes/no
Are you using an external user-backend, if yes which one: LDAP/ActiveDirectory/Webdav/…

LDAP configuration (delete this part if not used)

With access to your command line run e.g.:
sudo -u www-data php occ ldap:show-config
from within your ownCloud installation folder

Without access to your command line download the data/owncloud.db to your local
computer or access your SQL server remotely and run the select query:
SELECT * FROM `oc_appconfig` WHERE `appid` = 'user_ldap';

Eventually replace sensitive data as the name/IP-address of your LDAP server or groups.

Client configuration


Operating system:


Web server error log

Insert your webserver log here

ownCloud log (data/owncloud.log)

Insert your ownCloud log here

Browser log

Insert your browser log here, this could for example include:

a) The javascript console log
b) The network log 
c) ...

I have no problem with general sync and encryption/decryption, just for this file. How can I further debug that code 500 … php env. is 7.4.15

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