Create Detached Signature using PFX

Download Chilkat .NET for 2.0 / 3.5 Framework

Download Chilkat .NET for 1.0 / 1.1 Framework

Creates and verifies a detached signature.

Chilkat.Crypt2 crypt = new Chilkat.Crypt2();

//  Any string argument automatically begins the 30-day trial.
bool success;
success = crypt.UnlockComponent("30-day trial");
if (success != true) {
    MessageBox.Show("Crypt component unlock failed");
    return;
}

//  Create an instance of a certificate store object, load a PFX file,
//  locate the certificate we need, and use it for signing.
//  (a PFX file may contain more than one certificate.)
Chilkat.CertStore certStore = new Chilkat.CertStore();
//  The 1st argument is the filename, the 2nd arg is the
//  PFX file's password:
success = certStore.LoadPfxFile("chilkat.pfx","test");
if (success != true) {
    MessageBox.Show(certStore.LastErrorText);
    return;
}

Chilkat.Cert cert = null;
cert = certStore.FindCertBySubject("Chilkat Software, Inc.");
if (cert == null ) {
    MessageBox.Show(certStore.LastErrorText);
    return;
}

//  Tell the crypt component to use this cert.
crypt.SetSigningCert(cert);

//  We can sign any type of file, creating a .sig as output:
success = crypt.CreateDetachedSignature("test.pdf","test.sig");
if (success == true) {
    MessageBox.Show("Success!");
}

MessageBox.Show(crypt.LastErrorText);

//  Verify and restore the original file:
crypt.SetVerifyCert(cert);

success = crypt.VerifyDetachedSignature("test.pdf","test.sig");
if (success == true) {
    MessageBox.Show("Success!");
}

MessageBox.Show(crypt.LastErrorText);