Problem with XML Sign with certificate ECDSA SHA256

[andreadragotta]

Hi,

when i try to sign my XML file with a certificate ECDSA i receive a SignatureValue like this:

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAZziMuiM4XN8cux4+VMDah
qx8FNZdTglxzWwWxnZPDGAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
XLSfOo5ZV0dl8p7AqxVFlMA3SOCBJ9SjqSUeBR7P0N8=

Compared to other signature value created used the same cert but using different system is completely different and when i try to verify the singed XML i receive an error.

I've to change something or is present any bug for this signing method?

Thank you in advance

[andreadragotta]

I add some other infos.

When i try to sign with xmlsec1 via shell it works, on python i have this problem.

I don't know if depends on any python dependencies.