B4X Requires Chilkat v11.0.0+

POP3 Read S/MIME Encrypted Email

Read S/MIME encrypted email. B4X

Dim success As Boolean = False

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

'  The mailman object is used for receiving (POP3) 
'  and sending (SMTP) email.
Dim mailman As ChilkatMailMan
mailman.Initialize("mailman")

'  Set the POP3 server's hostname
mailman.MailHost = "pop.example.com"

'  Set the POP3 login/password.
mailman.PopUsername = "myLogin"
mailman.PopPassword = "myPassword"

'  If running on Microsoft Windows, the Chilkat mailman
'  will automatically search the registry-based certificate stores
'  for matching certificates and private keys required for
'  decryption.  However, on Linux, MAX OS X, and other
'  operating systems, no such thing exists.  Therefore, you'll 
'  need to specify one or more PFX (.p12 / .pfx) files as
'  sources for locating the certs required for decyrption.
success = mailman.AddPfxSourceFile("/pfxFiles/certs_and_keys_1.pfx", "pfxPassword1")
If success = False Then
    Log(mailman.LastErrorText)
    Return
End If


success = mailman.AddPfxSourceFile("/pfxFiles/certs_and_keys_2.pfx", "pfxPassword2")
If success = False Then
    Log(mailman.LastErrorText)
    Return
End If


'  ...
'  Note: On MS Windows, it is not required to provide PFX sources
'  if the needed certs and private keys are already installed
'  on the system (in the registry-based certificate stores).

'  Copy the all email from the user's POP3 mailbox 
'  into a bundle object.  The email remains on the server.
Dim bundle As ChilkatEmailBundle
bundle.Initialize
Dim keepOnServer As Boolean = True
Dim headersOnly As Boolean = False
'  Irrelevent because we are NOT downloading headers-only
Dim numBodyLines As Int = 0
success = mailman.FetchAll(keepOnServer, headersOnly, numBodyLines, bundle)
If success = False Then
    Log(mailman.LastErrorText)
    Return
End If


'  S/MIME security envelopes are automatically "unwrapped" 
'  when a message is retrieved from the server. Signed emails are automatically verified, and 
'  encrypted emails are automatically decrypted, restoring the email to the original state before 
'  signing and/or encrypting. Information about the signing and encrypting certificates can be 
'  retrieved from the Email object (methods: GetSignedByCert, GetEncryptedByCert; 
'  properties: SignedBy, EncryptedBy, SignaturesValid, Decrypted, ReceivedSigned, 
'  ReceivedEncrypted).

'  Loop over the bundle
Dim email As ChilkatEmail
email.Initialize
Dim i As Int = 0
Do While i < bundle.MessageCount

    bundle.EmailAt(i, email)

    Log(email.From)
    Log(email.Subject)

    '  At this point, if the email was signed and/or encrypted, it is already "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 = True Then

        Log("This email was encrypted when received.")
        If email.Decrypted = True Then
            Log("This email was successfully decrypted.  It was encrypted by:")
            Log(email.EncryptedBy)
        Else
            Log("This email was not decrypted.")
        End If

    End If

    If email.ReceivedSigned = True Then

        Log("This email was signed when received.")
        If email.SignaturesValid = True Then
            Log("The signature was verified.  It was signed by:")
            Log(email.SignedBy)
        Else
            Log("The signature verification failed.")
        End If

    End If


    '  The email's body, HTML body, attachments, etc.
    '  are decrypted and available just like any non-encrypted email.

    Log("--")

    i = i + 1
Loop