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(Unicode C++) Create PKCS7 Attached/Opaque Signature (S/MIME)

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

Chilkat C/C++ Library Downloads

MS Visual C/C++

Linux/CentOS C/C++

Alpine Linux C/C++

MAC OS X C/C++

armhf/aarch64 C/C++

C++ Builder

iOS C/C++

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MinGW C/C++

#include <CkMimeW.h>
#include <CkCertW.h>

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

    CkMimeW 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.
    CkCertW cert;
    const wchar_t *pfxFilepath = L"pfxFiles/something.pfx";
    const wchar_t *pfxPassword = L"secret";
    bool success = cert.LoadPfxFile(pfxFilepath,pfxPassword);
    if (success == false) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

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

    // Examine the MIME prior to signing:
    wprintf(L"--- MIME prior to signing ---\n");
    wprintf(L"%s\n",mime.getMime());

    // 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(L"SHA256");

    // Convert the MIME to PKCS7 signed-data.
    success = mime.ConvertToSigned(cert);
    if (success == false) {
        wprintf(L"%s\n",mime.lastErrorText());
        return;
    }

    // Examine the signed MIME
    wprintf(L"--- MIME converted to PKCS7 signed-data ---\n");
    wprintf(L"%s\n",mime.getMime());

    // 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"
    // 
    // MIIObAYJKoZIhvcNAQcCoIIOXTCCDlkCAQExDzANBglghkgBZQMEAgEFADB2BgkqhkiG9w0BBwGg
    // aQRnU3ViamVjdDogVGhpcyBpcyBhIHRlc3QNCk15Q3VzdG9tSGVhZGVyOiBhYmMxMjMNCkNvbnRl
    // bnQtVHlwZTogdGV4dC9wbGFpbg0KDQpUaGlzIGlzIGEgcGxhaW4tdGV4dCBib2R5LqCCCaAwggRm
    // MIIDTqADAgECAhBEvgyLUAAktBHTNi3gs18bMA0GCSqGSIb3DQEBBQUAMIGVMQswCQYDVQQGEwJV
    // UzELMAkGA1UECBMCVVQxFzAVBgNVBAcTDlNhbHQgTGFrZSBDaXR5MR4wHAYDVQQKExVUaGUgVVNF
    // UlRSVVNUIE5ldHdvcmsxITAfBgNVBAsTGGh0dHA6Ly93d3cudXNlcnRydXN0LmNvbTEdMBsGA1UE
    // AxMUVVROLVVTRVJGaXJzdC1PYmplY3QwHhcNOTkwNzA5MTgzMTIwWhcNMTkwNzA5MTg0MDM2WjCB
    // lTELMAkGA1UEBhMCVVMxCzAJBgNVBAgTAlVUMRcwFQYDVQQHEw5TYWx0IExha2UgQ2l0eTEeMBwG
    // A1UEChMVVGhlIFVTRVJUUlVTVCBOZXR3b3JrMSEwHwYDVQQLExhodHRwOi8vd3d3LnVzZXJ0cnVz
    // dC5jb20xHTAbBgNVBAMTFFVUTi1VU0VSRmlyc3QtT2JqZWN0MIIBIjANBgkqhkiG9w0BAQEFAAOC
    // AQ8AMIIBCgKCAQEAzqqBP6OjYXiqMQBVlRGeJw8fHN86m4JoMMBKYR3xLw76vnn3pSPvVVGWhM3b
    // 47luPjHYCiBnx/TZv5TrRwQ+As4qol2HBAn2MJ0Yipeyqhz8QdKhNsv7PZG659lwNfrk55DDm6Ob
    // 0zz1Epl3sbcJ4GjmHLjzlGOIamr+C3bJvvQi5Ge5qxped8GFB90NbL/uBsd3akGepw/X++6UF7f8
    // hb6kq8QcMd3XttHk8O/fFo+yUpPXodSJoQcuv+EBEkIeGuHYlTTbZHko/7ouEcLl6FuSSPtHC8Js
    // 2q0yg0HzpeVBcP1lkG36+lHE+b2WKxkELNNtp9zwf2+DZeJqq4eGdQIDAQABo4GvMIGsMAsGA1Ud
    // DwQEAwIBxjAPBgNVHRMBAf8EBTADAQH/MB0GA1UdDgQWBBTa7WR0FJwUPKvdmam9WyhNizzJ2DBC
    // BgNVHR8EOzA5MDegNaAzhjFodHRwOi8vY3JsLnVzZXJ0cnVzdC5jb20vVVROLVVTRVJGaXJzdC1P
    // YmplY3QuY3JsMCkGA1UdJQQiMCAGCCsGAQUFBwMDBggrBgEFBQcDCAYKKwYBBAGCNwoDBDANBgkq
    // hkiG9w0BAQUFAAOCAQEACB9SsTdEeNv9zrnalZaYqlVkgLVaQN0hpcXB818sTMhHWmnq6PA1NfTQ
    // JfPIpqSHSr0bsXMIvdTDyrY1u1mGdzHNp4AUrhPv/LFI+WslJS1RtixtRcGYyIpWXT7uQ04+ayeO
    // 0DpLhQtf0+1qp3XL0VqHLzl1E1pysAKBn77wD4RUIGJsadThTcYNmUMBDRKWjHidv1CisUSqas8X
    // es9vD9T4JFVf8DQWSWY+UEbJY3E4MWK4YrnzU61stSuiEqoZTwnaXueTxo4UCP7wMIAYoIaFTch9
    // 14sD/m7V950WrJIsoCPlnJFSH5TfF5Rzw7PBwXEFIAB4vRNSHag+zQAfyDCCBTIwggQaoAMCAQIC
    // EQDm/GiUo2tiCnVnsAEgJ0r7MA0GCSqGSIb3DQEBBQUAMIGVMQswCQYDVQQGEwJVUzELMAkGA1UE
    // CBMCVVQxFzAVBgNVBAcTDlNhbHQgTGFrZSBDaXR5MR4wHAYDVQQKExVUaGUgVVNFUlRSVVNUIE5l
    // dHdvcmsxITAfBgNVBAsTGGh0dHA6Ly93d3cudXNlcnRydXN0LmNvbTEdMBsGA1UEAxMUVVROLVVT
    // RVJGaXJzdC1PYmplY3QwHhcNMDkxMDEyMDAwMDAwWhcNMTAxMDEyMjM1OTU5WjCBoDELMAkGA1UE
    // BhMCVVMxDjAMBgNVBBEMBTYwMTg3MREwDwYDVQQIDAhJbGxpbm9pczEQMA4GA1UEBwwHV2hlYXRv
    // bjEaMBgGA1UECQwRMTcxOSBFIEZvcmVzdCBBdmUxHzAdBgNVBAoMFkNoaWxrYXQgU29mdHdhcmUs
    // IEluYy4xHzAdBgNVBAMMFkNoaWxrYXQgU29mdHdhcmUsIEluYy4wggEiMA0GCSqGSIb3DQEBAQUA
    // A4IBDwAwggEKAoIBAQC5ueUJPjI74J5Yavc3JUCWHEMMd2C9T+4VDuUcN7vzYuIOjsyV1yhzAl8+
    // uxzE+dhfcRK8qw9JbRV56Dzfyz5DqJH9x0rlbzkM24NeNZyM1kXIs2NHCJTYlYUqlVLZ2SXpiqru
    // nnYEFScZho3knWoBYC4841sdUay70pqluo2Y1CBbx5t+zYPXit370hEGzKLNK6XRTevcVQQMvL/f
    // d/gz241M8KBT8yvqTAjv6NJz9tHNUqhYO5mTT65nsIwKQ5/T8L+hsOHi4VM2QdVW6ZD9jrfPIfES
    // yOyfXCx2l9oEHfB3gwgdYQ4Mq9hRG77mIc9H+pw1V0yMmQmEVs0LP6hvAgMBAAGjggFuMIIBajAf
    // BgNVHSMEGDAWgBTa7WR0FJwUPKvdmam9WyhNizzJ2DAdBgNVHQ4EFgQUBMe/RfjpWAOjAMHml1qw
    // DvPa4OowDgYDVR0PAQH/BAQDAgeAMAwGA1UdEwEB/wQCMAAwEwYDVR0lBAwwCgYIKwYBBQUHAwMw
    // EQYJYIZIAYb4QgEBBAQDAgQQMEYGA1UdIAQ/MD0wOwYMKwYBBAGyMQECAQMCMCswKQYIKwYBBQUH
    // AgEWHWh0dHBzOi8vc2VjdXJlLmNvbW9kby5uZXQvQ1BTMEIGA1UdHwQ7MDkwN6A1oDOGMWh0dHA6
    // Ly9jcmwudXNlcnRydXN0LmNvbS9VVE4tVVNFUkZpcnN0LU9iamVjdC5jcmwwNAYIKwYBBQUHAQEE
    // KDAmMCQGCCsGAQUFBzABhhhodHRwOi8vb2NzcC5jb21vZG9jYS5jb20wIAYDVR0RBBkwF4EVYWRt
    // aW5AY2hpbGthdHNvZnQuY29tMA0GCSqGSIb3DQEBBQUAA4IBAQAP/2IpG75SHSFFqjHqvCXy0n0O
    // MTQk2IexnIUBlF7wm0oZquXBG2GlOPd9IXNr7k3wf4G+nZ6rgit6slVT1VxZS8RzqhGT3ZRTa2ud
    // dSqJyKxxrqdBJMY/WWaWVtCSU74AKAAm/ONwD1Zz39IZ2Mr8ApXn2LnZy4ZgI3hZnVR8I92/sppl
    // +NKWr0iMBpcz2KEwXZ5lrS5/4qRFlY+LQgRBFnjoM9WDW1lGEqeHFQQ/dqyrNiRAp+l7OzPBS4aM
    // nfxS+Yj/blpnuW41dVi9TJTXozRwiHzQ41FfrkJMD4JZULc539SK1EU1cYMl13x3JODHlng2IrjZ
    // pCKrFCsSCP2BMYIEJTCCBCECAQEwgaswgZUxCzAJBgNVBAYTAlVTMQswCQYDVQQIEwJVVDEXMBUG
    // A1UEBxMOU2FsdCBMYWtlIENpdHkxHjAcBgNVBAoTFVRoZSBVU0VSVFJVU1QgTmV0d29yazEhMB8G
    // A1UECxMYaHR0cDovL3d3dy51c2VydHJ1c3QuY29tMR0wGwYDVQQDExRVVE4tVVNFUkZpcnN0LU9i
    // amVjdAIRAOb8aJSja2IKdWewASAnSvswDQYJYIZIAWUDBAIBBQCgggJKMBgGCSqGSIb3DQEJAzEL
    // BgkqhkiG9w0BBwEwHAYJKoZIhvcNAQkFMQ8XDTEwMDYzMDE0NTg0MFowLwYJKoZIhvcNAQkEMSIE
    // ILEFXqrFbp/l0XOJyyjW1IJhjJxJaOhLUlZTc8VcabVMMF8GCSqGSIb3DQEJDzFSMFAwCwYJYIZI
    // AWUDBAECMAoGCCqGSIb3DQMHMA4GCCqGSIb3DQMCAgIAgDANBggqhkiG9w0DAgIBQDAHBgUrDgMC
    // BzANBggqhkiG9w0DAgIBKDCBvAYJKwYBBAGCNxAEMYGuMIGrMIGVMQswCQYDVQQGEwJVUzELMAkG
    // A1UECBMCVVQxFzAVBgNVBAcTDlNhbHQgTGFrZSBDaXR5MR4wHAYDVQQKExVUaGUgVVNFUlRSVVNU
    // IE5ldHdvcmsxITAfBgNVBAsTGGh0dHA6Ly93d3cudXNlcnRydXN0LmNvbTEdMBsGA1UEAxMUVVRO
    // LVVTRVJGaXJzdC1PYmplY3QCEQDm/GiUo2tiCnVnsAEgJ0r7MIG+BgsqhkiG9w0BCRACCzGBrqCB
    // qzCBlTELMAkGA1UEBhMCVVMxCzAJBgNVBAgTAlVUMRcwFQYDVQQHEw5TYWx0IExha2UgQ2l0eTEe
    // MBwGA1UEChMVVGhlIFVTRVJUUlVTVCBOZXR3b3JrMSEwHwYDVQQLExhodHRwOi8vd3d3LnVzZXJ0
    // cnVzdC5jb20xHTAbBgNVBAMTFFVUTi1VU0VSRmlyc3QtT2JqZWN0AhEA5vxolKNrYgp1Z7ABICdK
    // +zANBgkqhkiG9w0BAQEFAASCAQBfYh75saVFNXRPOzXOemaoVIFz+OHSsQB1fqXbV+hjGkxuvWAT
    // ldq32luVFFCz2gErWDT8eZ0yFVVwi16XyP7ptZeGU4cIGtrOozq78dziWwbNB021c3Dcw0vmH83m
    // FrU8ZNXYhL2+Lu4PlgvSCxHtC9EKrsP0s3WvBk3nMgXhu4Nmvkl1pCAofhAXWs545TfFB3jLEgeR
    // spbT6PhRR2lErXKF/Ga5NUyUqpw/Ba2YB3fFsbwiMyncmYicnUT2eYxxYBPtX9X6DQSKh3+iLNz0
    // sx89fluXIoqWONjR/XyN8zYd6WtEqMMwY6HQPAblFEuMPHZIhC0h/hfGAVisKLmh
    // 

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

 

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