C++

Duplicate OpensSSL to Create Signature using Cert and Key Files

See more OpenSSL Examples

This example duplicates the following:

openssl smime –sign -in something.xml -out something.der -signer mycert.crt -inkey cert.key -outform der –nodetach

Note: Although "smime" is the OpenSSL command, it's not actually producing S/MIME. The arguments "-outform der -binary" indicates that the output is binary DER (i.e. the PKCS7 binary signature). The input can be any type of file: XML, PDF, JPG, ... *anything*...

C++

#include <CkCrypt2.h>
#include <CkCert.h>
#include <CkBinData.h>
#include <CkPrivateKey.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.

    CkCrypt2 crypt;

    // Load the cert and private key from separate files.
    CkCert cert;
    success = cert.LoadFromFile("myCert.crt");
    if (success != true) {
        std::cout << cert.lastErrorText() << "\r\n";
        return;
    }

    CkBinData bd;
    success = bd.LoadFile("cert.key");
    CkPrivateKey privkey;
    // Load from any format private key.
    // If the file does not need a password, the 2nd arg is ignored.
    success = privkey.LoadAnyFormat(bd,"password_if_needed");
    if (success != true) {
        std::cout << privkey.lastErrorText() << "\r\n";
        return;
    }

    success = crypt.SetSigningCert2(cert,privkey);
    if (success != true) {
        std::cout << crypt.lastErrorText() << "\r\n";
        return;
    }

    // Create the opaque signature (PKCS7 binary DER that contains both the signature and original file data).
    success = crypt.CreateP7M("qa_data/infile.anything","qa_output/outfile.der");
    if (success != true) {
        std::cout << crypt.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "Success." << "\r\n";
    }