How we can verify openssl digital signature in C++ & windows API

Using  openssl I have created signed document on server, kindly refer below commands for it.

------Create private key.

openssl pkcs12 -in "D:\  Issues\XML  Encryption\mycredentialsandkey2010.pfx" -nodes -nocerts -out "D:\privatekey.pem" -nodes

------Create public key.

openssl rsa -in "D:\privatekey.pem" -pubout -out "D:\rsapublickey.pem"

------Create signed document.

openssl dgst -sha1 -sign "D:\privatekey.pem" -out "D:\ProductInformation_xml.cipher" "D:\ProductInformation.xml"

Now I can verify the digital signature using opensll like below

---Verify

openssl dgst -sha1 -verify "D:\rsapublickey.pem" -signature "D:\ProductInformation_xml.cipher" "D:\ProductInformation.xml"

But I need to verify digital signature using C++ & Windows API in client application (without openssl library or source code).

I know using  public  key & hash we can verify the digital signature. 

Kindly provide me pseudo code or windows API ASAP ???

Any help is appreciated.