Xojo Plugin

RSA Sign using Private Key of Certificate Type A3 (smart card / token)

See more RSA Examples

Demonstrates RSA signing data using the private key of a certificate type A3 (smart card, token).

Note: This is a Windows-only example.

Xojo Plugin

Dim success As Boolean
success = False

// First get the A3 certificate that was installed on the Windows system.
Dim certStore As New Chilkat.CertStore

Dim thumbprint As String
thumbprint = "12c1dd8015f3f03f7b1fa619dc24e2493ca8b4b2"

// This is specific to Windows because it is opening the Windows Current-User certificate store.
Dim bReadOnly As Boolean
bReadOnly = True
success = certStore.OpenCurrentUserStore(bReadOnly)
If (success <> True) Then
    System.DebugLog(certStore.LastErrorText)
    Return
End If

// Find the certificate with the desired thumbprint
// (There are many ways to locate a certificate.  This example chooses to find by thumbprint.)
Dim json As New Chilkat.JsonObject
success = json.UpdateString("thumbprint",thumbprint)

Dim cert As New Chilkat.Cert
success = certStore.FindCert(json,cert)
If (success = False) Then
    System.DebugLog("Failed to find the certificate.")
    Return
End If

System.DebugLog("Found: " + cert.SubjectCN)

Dim rsa As New Chilkat.Rsa

// Provide the cert's private key
Dim bUsePrivateKey As Boolean
bUsePrivateKey = True
success = rsa.SetX509Cert(cert,bUsePrivateKey)
If (success <> True) Then
    System.DebugLog(rsa.LastErrorText)
    Return
End If

// Now we're ready to sign..
Dim fac As New Chilkat.FileAccess

// Get bytes to be signed..
Dim inData As MemoryBlock
inData = fac.ReadEntireFile("in.dat")
Dim signature As MemoryBlock
signature = rsa.SignBytes(inData,"SHA-256")
If (rsa.LastMethodSuccess <> True) Then
    System.DebugLog(rsa.LastErrorText)
    Return
End If

System.DebugLog("Signature created.")