Warning: openssl_x509_read(): supplied parameter cannot be coerced into an X509 certificate!

[programeriss]

Sup,

I'm using key.pem to signing xml document, and get this error. If you get the same error and you can't change key to pfx or pcks7, just use something like that: xmlspec

xmlsec --sign --output doc-signed.xml \
     --privkey-pem userkey.pem doc.xml

or xmlsec1 ;-) And don't waste your time...