[kleopatra] [Bug 325806] New: Kleopatra 2.2.0 can't handle large (16K) RSA keys!

rsa_16384 at byom.de rsa_16384 at byom.de
Wed Oct 9 12:45:49 BST 2013


https://bugs.kde.org/show_bug.cgi?id=325806

            Bug ID: 325806
           Summary: Kleopatra 2.2.0 can't handle large (16K) RSA keys!
    Classification: Unclassified
           Product: kleopatra
           Version: 2.2.0
          Platform: unspecified
                OS: MS Windows
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: rsa_16384 at byom.de
                CC: mutz at kde.org

After installing the new Gpg4win 2.2.1 (2013-10-07) version, I imported my
previously generated long (16383-bit) RSA secret key into Kleopatra. At first
everything seemed to work fine, but after some hours of frustration I came to
the conclusion that Kleopatra can't handle such large keys. It is possible to
encrypt a file, but not to DECRYPT. Every time after pinentry, Kleopatra
crashes with these details:

APPCRASH
gpg2.exe
2.0.22.8453
libgcrypt-11.dll

(given by Windows 8 Pro - 64 Bit)

Also, with Thunderbird 24.0 and the latest Enigmal v1.6, there is a similar
problem. It is possible to send encrypted emails with the 16K key public key,
but every try to decrypt the message with the private part crashes Enigmail.

It would be a pity if these days only 4096-bit keys would work with Kleopatra.
Any help appreciated.

Reproducible: Always

Steps to Reproduce:
1. Encrypt file/email with 16K key.
2. Try to decrypt it, make pinentry.
3. Crash.
Actual Results:  
Kleopatra application crash:

APPCRASH
gpg2.exe
2.0.22.8453
libgcrypt-11.dll

(given by Windows 8 Pro - 64 Bit)

Expected Results:  
Accept pinentry, decrypt file/email.

Why large RSA keys might be already necessary: 

Post-quantum threats to traditional cryptography and generating 16k RSA
asymmetric key pairs with GnuPG

http://randexec.wordpress.com/2013/07/15/modify-gnupg-to-generate-16k-asymmetric-rsa-key-pairs/

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