[xmlsec] Problems load private key

[Lidia]

Hi,

When I generate signature i load private key using:
    key=xmlSecSimpleKeysMngrLoadPemKey(keysMngr, private_key_file,password,NULL,1)

The problem is if the private_key_file is encrypted with password then I can't load 
the key. If the "private_key_file" hasn't password I have not problems and I can load 
key.
Program doesn't crashing only  return key=NULL.

Regards,
lidia