Export Certificate and Private Key to PFX

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Demonstrates how to export a digital certificate, it's private key, and potentially all certificates in the chain of authentication to a PFX file.

Dim success As Boolean

'  This object is used to create a certificate store object.
Dim ccs As New Chilkat.CreateCS()

Dim certStore As Chilkat.CertStore
'  Open the local machine certificate store read-only.
ccs.ReadOnly = true
certStore = ccs.OpenLocalSystemStore()

'  Can we find a certificate by email address?
Dim cert As Chilkat.Cert
cert = certStore.FindCertBySubjectE("admin@chilkatsoft.com")
If (cert Is Nothing ) Then
    '  Open the current-user certificate store and check it instead.

    TextBox1.Text = TextBox1.Text & "Checking current-user certificate store..." & vbCrLf
    TextBox1.Refresh()

    certStore = ccs.OpenCurrentUserStore()

    cert = certStore.FindCertBySubjectE("admin@chilkatsoft.com")
    If (cert Is Nothing ) Then
        TextBox1.Text = TextBox1.Text & "Failed to find certificate!" & vbCrLf
        TextBox1.Refresh()
        Exit Sub
    End If


End If




'  Does this certificate have a private key accessible
'  to the calling process?  Private keys are *not* stored
'  within the certificate store.  Private keys are stored
'  in a key container in a Windows protected store.  It
'  can be one of two protected stores: the protected store for
'  the current logged-in user account, or the "machine-key"
'  protected store.  The private key must both exist in a
'  protected store, and the process must have permission to
'  access it...

'  You can only export to a PFX if the private key exists
'  and is accessible.

If (cert.HasPrivateKey() = true) Then

    '  Export to a PFX.
    '  Provide a password that will be required whenever the PFX is opened.
    '  Also, include all certs in the chain of authentication.
    Dim bIncludeChain As Boolean
    bIncludeChain = true
    success = cert.ExportToPfxFile("myCert.pfx","myPassword",bIncludeChain)
    If (success <> true) Then
        TextBox1.Text = TextBox1.Text & cert.LastErrorText & vbCrLf
        TextBox1.Refresh()
    Else
        TextBox1.Text = TextBox1.Text & "Exported to PFX!" & vbCrLf
        TextBox1.Refresh()
    End If


Else
    TextBox1.Text = TextBox1.Text & "Certificate does not have a private key available" & vbCrLf
    TextBox1.Refresh()
End If





'  The Chilkat Certificate, Certificate Store, Private Key,
'  Public Key, and Key Container classes / objects are freeware.

'  They are used by and included with the Chilkat Email,
'  Crypt, S/MIME, and other commercial Chilkat components.