Sign string with PFX certificate

It is possible to sign a string, using a PFX certificate (which contains 
all the authenticating chain) in C-ILE or C++/ILE ?

A simple example of what I want, in C#

public byte[] SignString(string mensagem)
         {
             X509Certificate2 certificado = GetPFXCertificate();
             CmsSigner signer = new 
CmsSigner(SubjectIdentifierType.IssuerAndSerialNumber, certificado);
             signer.DigestAlgorithm = new Oid("2.16.840.1.101.3.4.2.1"); 
//SHA256

             ContentInfo content = new ContentInfo(new 
Oid(Configuration.ContentOid), new 
System.Text.UTF8Encoding().GetBytes(mensagem));
             SignedCms signedCms = new SignedCms(content, false);

             signedCms.ComputeSignature(signer, false);
             var assinatura = signedCms.Encode();

             return assinatura;
         }

-- 
Alexandre S. Bencz

+55 {15} 997-980-511

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