Unicode C++

Specify a Certificate for Encrypted Email

Demonstrates the Chilkat Email.AddEncryptCert method, which explicitly specifies a certificate to use when sending encrypted email. Call it once per recipient certificate; ClearEncryptCerts clears the list. This example loads a recipient certificate, registers it, and enables encrypted sending.

Background: When encrypting to multiple people, each recipient needs to be able to decrypt with their own private key. S/MIME handles this by encrypting the message's one-time content key separately under each recipient's public certificate and including all of those wrapped keys in the message. AddEncryptCert is how you build that recipient list — one call per certificate — giving explicit control over exactly whose certificates are used rather than relying on automatic lookup.

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#include <CkEmailW.h>
#include <CkCertW.h>

void ChilkatSample(void)
    {
    bool success = false;

    //  Demonstrates the AddEncryptCert method, which explicitly specifies a certificate for
    //  sending encrypted email.  Call it once per recipient certificate.  Use ClearEncryptCerts
    //  to clear the list.

    CkEmailW email;
    email.put_Subject(L"Encrypted email");
    email.put_Body(L"Encrypted to the specified recipient certificate(s).");
    email.put_From(L"alice@example.com");
    email.AddTo(L"Bob",L"bob@example.com");

    //  Load a recipient certificate (public key) and add it to the encryption cert list.
    CkCertW cert;
    success = cert.LoadFromFile(L"qa_data/certs/recipient.cer");
    if (success == false) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    success = email.AddEncryptCert(cert);
    if (success == false) {
        wprintf(L"%s\n",email.lastErrorText());
        return;
    }

    //  Request encrypted sending.
    email.put_SendEncrypted(true);

    wprintf(L"Added the recipient's encryption certificate.\n");

    //  Note: The path "qa_data/certs/recipient.cer" is a relative local filesystem path,
    //  relative to the current working directory of the running application.
    }