B4X

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.

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B4X

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 ChilkatEmail
email.Initialize

success = email.LoadEml("qa_data/eml/encrypted.eml")
If success = False Then
    Log(email.LastErrorText)
    Return
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 ChilkatCert
        cert.Initialize("cert")
        success = email.LastDecryptCert(cert)
        If success = True Then
            Log("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.