(Visual Basic 6.0) Load Signed and/or Encrypted Email and Unwrap Security Layers

The LoadEml method loads an email (.eml file containing the MIME of an email) and automatically unwraps the digital signature and encryption security layers. A program can then examine the properties of the email object to see what was unwrapped.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Dim email As New ChilkatEmail

'  Provide PFX/.p12 files for any certs+keys needed for decryption.
'  Signature verification does not need anything extra.
'  (Also, Chilkat will automatically find and use pre-installed certs + private keys needed for decryption
'  on a Windows system.)
Dim success As Long
success = email.AddPfxSourceFile("/pfxFiles/certs_and_keys_1.pfx","pfxPassword1")
If (success <> 1) Then
    Debug.Print email.LastErrorText
    Exit Sub
End If

success = email.AddPfxSourceFile("/pfxFiles/certs_and_keys_2.pfx","pfxPassword2")
If (success <> 1) Then
    Debug.Print email.LastErrorText
    Exit Sub
End If

'  ...

'  Load a potentially signed and/or encrypted email.
success = email.LoadEml("someDir/someEmail.eml")

'  If the email was signed and/or encrypted, it was "unwrapped", i.e.
'  the email is already decrypted and in a state as if it were never signed or encrypted.

'  You may check to see if the email was received encrypted or signed, and if so,
'  whether it was successfully unwrapped and who signed or encrypted it:
If (email.ReceivedEncrypted = 1) Then

    Debug.Print "This email was encrypted."
    If (email.Decrypted = 1) Then
        Debug.Print "This email was successfully decrypted.  It was encrypted by:"
        Debug.Print email.EncryptedBy
    Else
        Debug.Print "This email was not decrypted."
    End If

End If

If (email.ReceivedSigned = 1) Then

    Debug.Print "This email was signed."
    If (email.SignaturesValid = 1) Then
        Debug.Print "The signature was verified.  It was signed by:"
        Debug.Print email.SignedBy
    Else
        Debug.Print "The signature verification failed."
    End If

End If

'  At this point, the contents of the email, including attachments, can be accessed normally..