PureBasic

Add a PFX Source (BinData) for S/MIME Decryption

Demonstrates the Chilkat Imap.AddPfxSourceBd method, which adds PFX data held in a BinData as a source of certificates and private keys for S/MIME processing. The first argument is the BinData and the second is the PFX password. Call it once for each additional source.

Note: The certificate path is relative to the application's current working directory. Supply the path to your own certificate file.

Background: When downloading encrypted (S/MIME) email, Chilkat needs the recipient's private key to decrypt it. Adding one or more PFX sources gives Chilkat a pool of keys to search; the matching key is used automatically as messages are fetched. The BinData form is handy when the PFX comes from memory — a database blob or a downloaded buffer — rather than a file on disk. On Windows and macOS the system certificate stores are also searched automatically.

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IncludeFile "CkBinData.pb"
IncludeFile "CkImap.pb"

Procedure ChilkatExample()

    success.i = 0

    ;  Demonstrates the Imap.AddPfxSourceBd method, which adds PFX data (from a BinData) as a
    ;  source of certificates and private keys for S/MIME decryption.  The 1st argument is the
    ;  BinData containing the PFX, and the 2nd is the PFX password.

    imap.i = CkImap::ckCreate()
    If imap.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkImap::setCkSsl(imap, 1)
    CkImap::setCkPort(imap, 993)

    success = CkImap::ckConnect(imap,"imap.example.com")
    If success = 0
        Debug CkImap::ckLastErrorText(imap)
        CkImap::ckDispose(imap)
        ProcedureReturn
    EndIf

    success = CkImap::ckLogin(imap,"user@example.com","myPassword")
    If success = 0
        Debug CkImap::ckLastErrorText(imap)
        CkImap::ckDispose(imap)
        ProcedureReturn
    EndIf

    ;  Load the PFX data into a BinData.
    bdPfx.i = CkBinData::ckCreate()
    If bdPfx.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkBinData::ckLoadFile(bdPfx,"qa_data/smime.pfx")
    If success = 0
        Debug CkBinData::ckLastErrorText(bdPfx)
        CkImap::ckDispose(imap)
        CkBinData::ckDispose(bdPfx)
        ProcedureReturn
    EndIf

    ;  The PFX password is not hard-coded in source.  Insert code here to obtain it from an
    ;  interactive prompt, environment variable, or a secrets vault.
    pfxPassword.s

    ;  Add the PFX as a source for S/MIME certificates and private keys.  Call once per source.
    success = CkImap::ckAddPfxSourceBd(imap,bdPfx,pfxPassword)
    If success = 0
        Debug CkImap::ckLastErrorText(imap)
        CkImap::ckDispose(imap)
        CkBinData::ckDispose(bdPfx)
        ProcedureReturn
    EndIf

    ;  Messages downloaded after this are automatically decrypted when a matching key is found.

    success = CkImap::ckDisconnect(imap)
    If success = 0
        Debug CkImap::ckLastErrorText(imap)
        CkImap::ckDispose(imap)
        CkBinData::ckDispose(bdPfx)
        ProcedureReturn
    EndIf



    CkImap::ckDispose(imap)
    CkBinData::ckDispose(bdPfx)


    ProcedureReturn
EndProcedure