Visual Basic 6.0

Set the Decryption Certificate and Private Key

Demonstrates the Chilkat Email.SetDecryptCert2 method, which explicitly provides a certificate and its corresponding private key as separate objects for decrypting a received encrypted email. Set them before loading the encrypted message. This example loads a .cer certificate and a PEM private key, sets both, then loads an encrypted email.

Background: Sometimes the certificate and its private key are stored separately — a public .cer file plus a PEM (or other format) key file — rather than combined in a PFX. SetDecryptCert2 accepts the two objects individually, which is the natural fit for that arrangement. It is the two-object counterpart to SetDecryptCert, which takes a single certificate that already carries its private key.

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Visual Basic 6.0

Dim success As Long
success = 0

'  Demonstrates the SetDecryptCert2 method, which explicitly provides a certificate and its
'  corresponding private key (as separate objects) for decrypting a received encrypted
'  email.  Set them before loading the encrypted email.

Dim email As New ChilkatEmail

'  Load the certificate (public) and the matching private key from separate files.
Dim cert As New ChilkatCert
success = cert.LoadFromFile("qa_data/certs/recipient.cer")
If (success = 0) Then
    Debug.Print cert.LastErrorText
    Exit Sub
End If

Dim privKey As New PrivateKey
success = privKey.LoadPemFile("qa_data/certs/recipient_privkey.pem")
If (success = 0) Then
    Debug.Print privKey.LastErrorText
    Exit Sub
End If

'  Provide the certificate and private key to use for decryption.
success = email.SetDecryptCert2(cert,privKey)
If (success = 0) Then
    Debug.Print email.LastErrorText
    Exit Sub
End If

'  Load the encrypted email; Chilkat decrypts it using the certificate and key.
success = email.LoadEml("qa_data/eml/encrypted.eml")
If (success = 0) Then
    Debug.Print email.LastErrorText
    Exit Sub
End If

Debug.Print "Decrypted = " & email.Decrypted

'  Note: Paths such as "qa_data/..." are relative local filesystem paths,
'  relative to the current working directory of the running application.