(VB.NET) AddDetachedSignaturePk

Demonstrates how to add a detached signature using a certifcate and it's corresponding private key. The easiest way of doing it is when both the certificate and private key are contained together within a PFX (.pfx or .p12) file. This example demonstrates how to use the certificate and its corresponding private key when they are stored in separate files -- a .cer for the certificate, and a .pem for the private key.

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

' This example assumes the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim mime As New Chilkat.Mime

' Load the certificate from a .cer file.
Dim cert As New Chilkat.Cert
Dim success As Boolean = cert.LoadFromFile("aaworkarea/myCert.cer")
If (success = False) Then
    Debug.WriteLine(cert.LastErrorText)
    Exit Sub
End If


' Load the private key from an encrypted PEM file.
' (A private key can be loaded from other file formats also..)
Dim privKey As New Chilkat.PrivateKey
success = privKey.LoadEncryptedPemFile("aaworkarea/myPrivateKey.pem","myPassword")
If (success = False) Then
    Debug.WriteLine(privKey.LastErrorText)
    Exit Sub
End If


success = mime.SetBodyFromPlainText("This is the plain-text MIME body.")

' Sign the MIME (adds a PKCS7 detached signature)
success = mime.AddDetachedSignaturePk(cert,privKey)
If (success = False) Then
    Debug.WriteLine(mime.LastErrorText)
    Exit Sub
End If


' Save the S/MIME to a file.
success = mime.SaveMime("aaworkarea/signedMime.txt")
If (success = False) Then
    Debug.WriteLine(mime.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("success!")