On a windows 7 platform, I have two certificates available in the keystore: one RSA certificate and one ELC nist256 certificate.
I am able to view and sign an odt document with the RSA certificate but I am not able to view the ELC certificate in the LibreOffice popup window, thus not being able to sign the document.
I have the same behaviour whether the certificates are stored locally (ie. on the hard disk) or externally (ie. on a smart card).
Maybe unrelated, but I mention it anyway: https://vmiklos.hu/blog/xmlsec-lo54.html
Could you please try to reproduce it with the latest version of LibreOffice from https://www.libreoffice.org/download/libreoffice-fresh/ ?
I have set the bug's status to 'NEEDINFO'. Please change it back to 'UNCONFIRMED' if the bug is still present in the latest version.
No need to test, this is a known problem. ECDSA works with NSS (Linux, macOS), but not with CryptoAPI (Windows). The hard part is CryptoAPI won't support this, which means most probably the whole Windows signing has to be ported to CNG first, and then it can support ECDSA. This affects libxmlsec + the mscrypto part of xmlsecurity/.
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https://vmiklos.hu/blog/xmlsec-cng-ecsa.html LO 6.2 is meant to accept ECDSA certificates on Windows, I implemented the certificate chooser support for that in commit 93e33ba279e837356e157745177d7f6061d442b7. I did not mention this bug in the commit message as I forgot that this was already reported. So let's mark this as resolved.