C++

Create PKCS7 Attached/Opaque Signature (S/MIME)

See more MIME Examples

Create an S/MIME message with a PKCS7 attached/opaque signature. C++

#include <CkMime.h>
#include <CkCert.h>

void ChilkatSample(void)
    {
    bool success = false;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkMime mime;

    // Load a certificate w/ private key for signing.
    // There are many ways of getting a certificate object:
    // from a pfx file, from .cer and private-key files, from the
    // Windows registry-based certificate stores, etc.
    // Load a PFX file into a certificate object.
    CkCert cert;
    const char *pfxFilepath = "pfxFiles/something.pfx";
    const char *pfxPassword = "secret";
    success = cert.LoadPfxFile(pfxFilepath,pfxPassword);
    if (success == false) {
        std::cout << cert.lastErrorText() << "\r\n";
        return;
    }

    // Create a very simple MIME message to be signed:
    success = mime.AddHeaderField("Subject","This is a test");
    success = mime.AddHeaderField("MyCustomHeader","abc123");
    mime.put_ContentType("text/plain");
    mime.SetBody("This is a plain-text body.");

    // Examine the MIME prior to signing:
    std::cout << "--- MIME prior to signing ---" << "\r\n";
    std::cout << mime.getMime() << "\r\n";

    // The MIME prior to signing looks like this:
    // -------------------------------------------------------------------------------

    // Subject: This is a test
    // MyCustomHeader: abc123
    // Content-Type: text/plain
    // 
    // This is a plain-text body.

    // -------------------------------------------------------------------------------

    // The default hash algorithm used in the signing process is "SHA1".
    // To change it, set the SigningHashAlg property:
    mime.put_SigningHashAlg("SHA256");

    // Convert the MIME to PKCS7 signed-data.
    success = mime.ConvertToSigned(cert);
    if (success == false) {
        std::cout << mime.lastErrorText() << "\r\n";
        return;
    }

    // Examine the signed MIME
    std::cout << "--- MIME converted to PKCS7 signed-data ---" << "\r\n";
    std::cout << mime.getMime() << "\r\n";

    // The MIME after signing looks like this:
    // -------------------------------------------------------------------------------

    // Subject: This is a test
    // MyCustomHeader: abc123
    // Content-Disposition: attachment; filename="smime.p7m"
    // Content-Transfer-Encoding: base64
    // Content-Type: application/x-pkcs7-mime;
    //  name="smime.p7m"; smime-type="signed-data"
    // 
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    // aQRnU3ViamVjdDogVGhpcyBpcyBhIHRlc3QNCk15Q3VzdG9tSGVhZGVyOiBhYmMxMjMNCkNvbnRl
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    // 

    // ------------------------------------------------------------------------------
    }