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

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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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#include <C_CkImap.h>
#include <C_CkBinData.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkImap imap;
    HCkBinData bdPfx;
    const char *pfxPassword;

    success = FALSE;

    //  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 = CkImap_Create();

    CkImap_putSsl(imap,TRUE);
    CkImap_putPort(imap,993);

    success = CkImap_Connect(imap,"imap.example.com");
    if (success == FALSE) {
        printf("%s\n",CkImap_lastErrorText(imap));
        CkImap_Dispose(imap);
        return;
    }

    success = CkImap_Login(imap,"user@example.com","myPassword");
    if (success == FALSE) {
        printf("%s\n",CkImap_lastErrorText(imap));
        CkImap_Dispose(imap);
        return;
    }

    //  Load the PFX data into a BinData.
    bdPfx = CkBinData_Create();
    success = CkBinData_LoadFile(bdPfx,"qa_data/smime.pfx");
    if (success == FALSE) {
        printf("%s\n",CkBinData_lastErrorText(bdPfx));
        CkImap_Dispose(imap);
        CkBinData_Dispose(bdPfx);
        return;
    }

    //  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.

    //  Add the PFX as a source for S/MIME certificates and private keys.  Call once per source.
    success = CkImap_AddPfxSourceBd(imap,bdPfx,pfxPassword);
    if (success == FALSE) {
        printf("%s\n",CkImap_lastErrorText(imap));
        CkImap_Dispose(imap);
        CkBinData_Dispose(bdPfx);
        return;
    }

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

    success = CkImap_Disconnect(imap);
    if (success == FALSE) {
        printf("%s\n",CkImap_lastErrorText(imap));
        CkImap_Dispose(imap);
        CkBinData_Dispose(bdPfx);
        return;
    }



    CkImap_Dispose(imap);
    CkBinData_Dispose(bdPfx);

    }