Signed OVA package verification with ovftool failed

Greetings!

I'm currently trying to sign created OVA package with trusted certificate from Thawte.

This cert is valid (till 2013) and could be easily verified with openssl (`openssl verify sign.cert`) or with Windows tools.

Signing works as follows and it is okay:

ovftool --sourceType=vmx --targetType=ova --privateKey=sign.pem package.vmx package.ova

But when I try to check it with ovftool (`ovftool package.ova`) it shows:

Error: Verification of package.cert failed

Also verification of package.cert itself with openssl is also fine.

Can anybody help me on what could cause such problem?

Thanks in advance.