VB.NET

Get the Certificate Used to Decrypt an Email

Demonstrates the Chilkat Email.LastDecryptCert method, which copies the certificate used to decrypt this email into a Cert object. It should be called after a successful decryption. This example loads an encrypted email and, if it was decrypted, reads the decrypting certificate's common name.

Background: When a message could be decrypted with one of several available private keys, it is often useful to know which certificate actually did the job — for auditing, for confirming the message was encrypted for the expected identity, or for logging. LastDecryptCert hands you that certificate as an object so you can inspect its subject, issuer, validity dates, and more.

Chilkat VB.NET Downloads

Download Chilkat for VB.NET

VB.NET

Dim success As Boolean = False

'  Demonstrates the LastDecryptCert method, which copies the certificate used to decrypt
'  this email into a Cert object.  Call it after a successful decryption.

Dim email As New Chilkat.Email

success = email.LoadEml("qa_data/eml/encrypted.eml")
If (success = False) Then
    Debug.WriteLine(email.LastErrorText)
    Exit Sub
End If


If (email.ReceivedEncrypted = True) Then
    If (email.Decrypted = True) Then
        '  Get the certificate that was used to decrypt the email.
        Dim cert As New Chilkat.Cert
        success = email.LastDecryptCert(cert)
        If (success = True) Then
            Debug.WriteLine("Decrypted with certificate (CN): " & cert.SubjectCN)
        End If

    End If

End If


'  Note: The path "qa_data/..." is a relative local filesystem path,
'  relative to the current working directory of the running application.