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I obtained a client certificate from CAcert through Firefox. I want to use that certificate to sign a document created with LibreOffice Writer.

In Writer, I click File > Digital Signatures... to get the Digital Signatures dialog which is supposed to show the list of certificates available. The list is empty.

How can I make the certificate, which I obtained via Firefox, available to Writer?

Part One: With Firefox, back up the certificate as a .p12 file.

1. In Firefox, click Edit > Preferences to display the Preferences
   dialog.




2. On the Preferences dialog, click the Advanced button.




3. On the Advanced form, click the the View Certificates button to
   display the Certificate Manager dialog.




4. On the Certificate Manager dialog, click the Your Certificates tab.




5. Expand the relevant certificate authority name and click the
   relevant certificate to select it.




6. Click the Backup button to display a Save As dialog titled File Name
   to Backup.




7. On the File Name to Backup dialog, in the Name text box, type the
   name you want to give to the backup copy of the file.




8. Select the folder in which you want to save the file.




9. Click the Save button to display the Choose a Certificate Backup
   Password dialog.




10. Type your chosen password twice. Click the OK button.




11. An Alert dialog will appear, informing you that your certificates
    and private keys were successfully backed up. Click the OK button.




12. Close the other two open dialogs.

Part 2: With Thunderbird, import the .p12 file to Thunderbirds certificate store.

1. In Thunderbird, click Edit > Prefereces, to display the Thunderbird Preferences dialog.




2. Click the Advanced button on the top menu.




3. On the Advanced form, click the Certificates tab.




4. Click the View Certificates button to display the Certificate Manager dialog.




5. Click the Your Certificates tab.




6. Click the Import button to display the Certificates to Import dialog.




7. Find the .p12 file which you backed from Firefox, click it and click the Open button to display the Password Entry dialog.




8. Type the password you used to backup the file from Firefox and click the OK button.




9. An Alert dialog will appear, indicating that the operation was successfull.




10. Close the other two open dialogs.

Part 3: In Thunderbird, edit the root certificate of your certificate authority to make it trusted for identifying websites, mail users and software makers.

1. Display the Certificate Manager dialog as described in Part 2.




2. On the Certificate Manager dialog, click the Authorities tab.




3. In the list of root certificates, click on your certificate authority's certificate to select it.




4. Click the Edit Trust... button to display the Edit Trust Settings dialog.




5. Check the three checkboxes to make your certificate authority trusted for websites, email and software.




6. Click the OK button.




7. Close all open dialogs.

Part 4: In LibreOffice Writer, verify that the certificate is available for digital signatures.

1. Close all Writer windows which may have been running.




2. Open an existing Writer document (because you can only view the certificates from a file which is saved to
   disk).




3. Click File > Digital Signatures... to display the Digital Signatures dialog.




4. Click the Sign Document button to display the Select Certificate dialog.

Your certificate will appear in the list of certificates.

If you have Thunderbird installed, you need to import the certificate into Thunderbird's certificates store.

Another option is to use TinyCA to generate your own certificate.

If your Certificate does not show up in Libreoffice check:

Tools => Options => Security => Certificate Path

(Thunderbird is the default certificate store):