PureBasic

POP3 Read S/MIME Encrypted Email

Read S/MIME encrypted email. PureBasic

IncludeFile "CkEmailBundle.pb"
IncludeFile "CkEmail.pb"
IncludeFile "CkMailMan.pb"

Procedure ChilkatExample()

    success.i = 0

    ; 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.
    mailman.i = CkMailMan::ckCreate()
    If mailman.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; Set the POP3 server's hostname
    CkMailMan::setCkMailHost(mailman, "pop.example.com")

    ; Set the POP3 login/password.
    CkMailMan::setCkPopUsername(mailman, "myLogin")
    CkMailMan::setCkPopPassword(mailman, "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 = CkMailMan::ckAddPfxSourceFile(mailman,"/pfxFiles/certs_and_keys_1.pfx","pfxPassword1")
    If success = 0
        Debug CkMailMan::ckLastErrorText(mailman)
        CkMailMan::ckDispose(mailman)
        ProcedureReturn
    EndIf

    success = CkMailMan::ckAddPfxSourceFile(mailman,"/pfxFiles/certs_and_keys_2.pfx","pfxPassword2")
    If success = 0
        Debug CkMailMan::ckLastErrorText(mailman)
        CkMailMan::ckDispose(mailman)
        ProcedureReturn
    EndIf

    ; ...
    ; 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.
    bundle.i = CkEmailBundle::ckCreate()
    If bundle.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    keepOnServer.i = 1
    headersOnly.i = 0
    ; Irrelevent because we are NOT downloading headers-only
    numBodyLines.i = 0
    success = CkMailMan::ckFetchAll(mailman,keepOnServer,headersOnly,numBodyLines,bundle)
    If success = 0
        Debug CkMailMan::ckLastErrorText(mailman)
        CkMailMan::ckDispose(mailman)
        CkEmailBundle::ckDispose(bundle)
        ProcedureReturn
    EndIf

    ; 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
    email.i = CkEmail::ckCreate()
    If email.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    i.i = 0
    While i < CkEmailBundle::ckMessageCount(bundle)

        CkEmailBundle::ckEmailAt(bundle,i,email)

        Debug CkEmail::ckFrom(email)
        Debug CkEmail::ckSubject(email)

        ; 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 CkEmail::ckReceivedEncrypted(email) = 1

            Debug "This email was encrypted when received."
            If CkEmail::ckDecrypted(email) = 1
                Debug "This email was successfully decrypted.  It was encrypted by:"
                Debug CkEmail::ckEncryptedBy(email)
            Else
                Debug "This email was not decrypted."
            EndIf

        EndIf

        If CkEmail::ckReceivedSigned(email) = 1

            Debug "This email was signed when received."
            If CkEmail::ckSignaturesValid(email) = 1
                Debug "The signature was verified.  It was signed by:"
                Debug CkEmail::ckSignedBy(email)
            Else
                Debug "The signature verification failed."
            EndIf

        EndIf

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

        Debug "--"

        i = i + 1
    Wend


    CkMailMan::ckDispose(mailman)
    CkEmailBundle::ckDispose(bundle)
    CkEmail::ckDispose(email)


    ProcedureReturn
EndProcedure