[Bug]: Encryption not ready: multikeydecrypt with share key failed

[benhiemer]

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

A bit similar to #41704 but "the other way around"

My Nextcloud instance is not freshly installed, it is running for years. Last week, I updated to version 32 (but I do not think the problem is related to the update). The instance runs with Server-side Encryption activated for years without problems.

Yesterday, I installed the apps memories and preview-generator. Just wanted to try them out.

However, since that time files cannot be decrypted anymore on all clients and for all users! Files are listed correctly and can be deleted. But they cannot be read. If I try to read a file...

• On the Android App, I get the error: "The document could not be loaded. Please check your internet connection"
• On the web ui, I get a blank screen with a warning triangle.
• On my Linux client, I get: " could not be sync due to an error. Please see the log"

Now, it gets interesting: on the server logs, I see these messages a lot (I think every time I try to receive a file):

MultiKeyDecryptException multikeydecrypt with share key failed:error:040A1079:rsa routines:RSA_padding_check_PKCS1_OAEP_mgf1:oaep decoding error

ServiceUnavailable Encryption not ready: multikeydecrypt with share key failed:error:040A1079:rsa routines:RSA_padding_check_PKCS1_OAEP_mgf1:oaep decoding error

I searched/copied the logs, see below.

I removed both apps, no changes. I tried these commands (source), no changes:

occ encryption:fix-encrypted-version
occ encryption:fix-key-location

My next step would be

1. try to decrypt everything
2. restore a backup

But I wanted to share this first. Thanks!

Steps to reproduce

I do not know how to reproduce this.

Expected behavior

Decryption of files should work without errors.

Nextcloud Server version

32

Operating system

RHEL/CentOS

PHP engine version

PHP 8.2

Web server

Apache (supported)

Database engine version

MySQL

Is this bug present after an update or on a fresh install?

None

Are you using the Nextcloud Server Encryption module?

Encryption is Enabled

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

List of activated Apps

Enabled:
  - activity: 5.0.0-dev.0
  - admin_audit: 1.22.0
  - app_api: 32.0.0
  - bruteforcesettings: 5.0.0-dev.0
  - calendar: 6.1.3
  - circles: 32.0.0
  - cloud_federation_api: 1.16.0
  - contactsinteraction: 1.13.1
  - cospend: 3.1.6
  - dashboard: 7.12.0
  - dav: 1.34.2
  - encryption: 2.20.0
  - federatedfilesharing: 1.22.0
  - files: 2.4.0
  - files_downloadlimit: 5.0.0-dev.0
  - files_pdfviewer: 5.0.0-dev.0
  - files_reminders: 1.5.0
  - files_sharing: 1.24.1
  - files_trashbin: 1.22.0
  - files_versions: 1.25.0
  - firstrunwizard: 5.0.0-dev.0
  - logreader: 5.0.0-dev.0
  - lookup_server_connector: 1.20.0
  - news: 27.2.0
  - nextcloud_announcements: 4.0.0-dev.0
  - notifications: 5.0.0-dev.0
  - oauth2: 1.20.0
  - password_policy: 4.0.0-dev.0
  - photos: 5.0.0-dev.1
  - privacy: 4.0.0-dev.0
  - profile: 1.1.0
  - provisioning_api: 1.22.0
  - recommendations: 5.0.0-dev.0
  - related_resources: 3.0.0-dev.0
  - serverinfo: 4.0.0-dev.0
  - settings: 1.15.1
  - sharebymail: 1.22.0
  - support: 4.0.0-dev.0
  - survey_client: 4.0.0-dev.0
  - systemtags: 1.22.0
  - text: 6.0.1
  - theming: 2.7.0
  - twofactor_backupcodes: 1.21.0
  - twofactor_totp: 14.0.0
  - updatenotification: 1.22.0
  - user_status: 1.12.0
  - viewer: 5.0.0-dev.0
  - webhook_listeners: 1.3.0
  - workflowengine: 2.14.0
Disabled:
  - comments: 1.22.0 (installed 1.8.0)
  - federation: 1.22.0 (installed 1.8.0)
  - files_external: 1.24.0
  - memories: 7.7.0 (installed 7.7.0)
  - suspicious_login: 10.0.0-dev.0
  - twofactor_nextcloud_notification: 6.0.0-dev.0
  - user_ldap: 1.23.0
  - weather_status: 1.12.0 (installed 1.0.0)

Nextcloud Signing status

No errors have been found.

Nextcloud Logs

{"reqId":"LV48b6JYGldM1hclPOmB","level":3,"time":"2026-01-05T12:51:26+00:00","remoteAddr":"","user":"--","app":"memories","method":"","url":"--","message":"Failed to index file /ben/files/Tickets/IMG_20251029_203354.jpg: Failed to get local file: Unable to get header block for files/Tickets/IMG_20251029_203354.jpg","userAgent":"--","version":"32.0.3.2","data":{"app":"memories"},"id":"695ceaf38df98"}
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Additional info

No response

[joshtrichards]

Are you using per-user keys?

Possibly relevant recent changes:

#54316
#55466
#56167

[benhiemer]

Are you using per-user keys?

Possibly relevant recent changes:

#54316 #55466 #56167

Thanks for your response.

Honestly, I am not 100% sure but I think at the time I enabled the Server-Side Encryption, per-user key was the default and I never changed that -> so I guess yes.

I tried to decrypt everything using occ encryption:decrypt-all but got an exception for every file. So I restored a backup from two days ago -> everything worked again.

Thanks for the links. I decided to run occ encryption:decrypt-all again, this time it worked (after the backup has been restored). So now my instance runs without server encryption. Maybe I try the master key approach some day.

Sorry for the inconvenience, I had to get the instance up and running again, so I decided to go with the backup. Whatever the cause was, the problem has been "fixed" for now.