(C) PKCS7 Encrypt using Multiple Certificates

Encrypts MIME using multiple digital certificates. Calls AddEncryptCert once per certificate, followed by a call to EncryptN. The MIME may be decrypted by any owner of one of the certificates + its associated private key.

Downloads:

MS Windows Visual C/C++ Libraries

Linux/CentOS C/C++ Libraries

MAC OS X C/C++ Libraries

Solaris C/C++ Libraries

C++ Builder Libraries

FreeBSD C++ Libraries

HP-UX C++ Libraries

BlackBerry QNX C++ Libraries

#include <C_CkMime.h>
#include <C_CkCert.h>

void ChilkatSample(void)
    {
    HCkMime mime;
    BOOL success;
    HCkCert cert1;
    HCkCert cert2;

    mime = CkMime_Create();

    success = CkMime_UnlockComponent(mime,"Anything for 30-day trial.");
    if (success == FALSE) {
        printf("%s\n",CkMime_lastErrorText(mime));
        return;
    }

    //  Build a simple MIME message to be encrypted:
    CkMime_AddHeaderField(mime,"Content-Type","text/plain");
    CkMime_AddHeaderField(mime,"abc","123");
    CkMime_SetBody(mime,"This is a test");

    //  A digital certificate is required to create PKCS7 encrypted MIME.
    //  It can come from a variety of sources: .cer file, .pfx file, PEM files,
    //  an in-memory representation, or directly from a Windows
    //  registry-based certificate store.

    //  Load one cert from a .cer file:
    cert1 = CkCert_Create();
    success = CkCert_LoadFromFile(cert1,"myCert.cer");
    if (success == FALSE) {
        printf("%s\n",CkCert_lastErrorText(cert1));
        return;
    }

    //  Load another cert ...
    cert2 = CkCert_Create();
    success = CkCert_LoadFromFile(cert2,"anotherCert.cer");
    if (success == FALSE) {
        printf("%s\n",CkCert_lastErrorText(cert2));
        return;
    }

    //  Tell the MIME object to use these certs for encrypting:
    //  (AddEncryptCert shouldn't fail if we already know it contains
    //  a valid certificate..)
    success = CkMime_AddEncryptCert(mime,cert1);
    success = CkMime_AddEncryptCert(mime,cert2);

    //  Encrypt the MIME:
    success = CkMime_EncryptN(mime);
    if (success == FALSE) {
        printf("%s\n",CkMime_lastErrorText(mime));
        return;
    }

    //  Display the MIME:
    printf("%s\n",CkMime_getMime(mime));

    //  The resulting S/MIME looks something like this:
    //  
abc: 123
Content-Disposition: attachment; filename="smime.p7m"
Content-Transfer-Encoding: base64
Content-Type: application/x-pkcs7-mime;
 name="smime.p7m"

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    CkMime_Dispose(mime);
    CkCert_Dispose(cert1);
    CkCert_Dispose(cert2);

    }