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Kleopatra: Improve handling of MDC errors
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Description

This should have probably been done for the 3.1.2 release. So I give it high priority as it should definitely done before the next release.

We are starting to get reports by users that files fail to decrypt with Gpg4win 3.1.2 and they only see the generic "Decryption Failed" error. (e.g. https://wald.intevation.org/forum/message.php?msg_id=6037 )

I think the problem is in GPGME actually. (Also see T3714 ) As the decryption result should provide the correct error. But we might also use the new flag for legacy no mdc to improve the handling in Kleopatra.

Details

Version
3.1.2

Revisions and Commits

rKLEOPATRA Kleopatra
rKLEOPATRA9e5fa86561ae Handle no MDC for legacy algos gracefully

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StatusAssignedTask
 ResolvedaheineckeT4038 Kleopatra: Improve handling of MDC errors
 ResolvedaheineckeT4029 Gpg4win 3.1.3

Event Timeline

aheinecke created this task.Jun 21 2018, 8:53 AM
aheinecke added a comment.Jul 4 2018, 8:33 AM

We have two cases:

  1. No MDC with a "modern" cipher algo

In that case we don't get any status from GnuPG except "Decryption Failed"

  1. No MDC with an "old" cipher algo

This is already handled and provided by gpgme++ with legacyCipherNoMDC

Both cases currently look like this:


Which is very bad as it gives users no indication what went wrong.

aheinecke changed the task status from Open to Testing.Jul 4 2018, 12:31 PM

Now we have this:

aheinecke added a subtask: T4029: Gpg4win 3.1.3.Jul 4 2018, 12:31 PM
aheinecke added a commit: rKLEOPATRA9e5fa86561ae: Handle no MDC for legacy algos gracefully.Jul 4 2018, 12:38 PM
aheinecke mentioned this in T4053: gpg.exe 2.2.8.52634 crashes in msvcrt.dll.Jul 4 2018, 5:28 PM
aheinecke closed this task as Resolved.Sep 4 2018, 9:22 AM

Gpg4win-3.1.3 was released.

aheinecke closed subtask T4029: Gpg4win 3.1.3 as Resolved.Sep 4 2018, 9:24 AM
KarlS added a subscriber: KarlS.Mar 11 2019, 12:47 PM

I'm new here, therefore I'm unsure whether this posting is correct at this position.
Within my organisation we have ongoing troubles with the error described here, with windows version 3.1.3 there is no such button "force decryption" as documented here.


Can you help? Regards Karl

aheinecke mentioned this in T4402: Kleopatra decrypt error - Missing MDC for non legacy algos.Mar 11 2019, 6:00 PM

It's better to have a new Task for this as I explain in T4402