Chilkat Examples

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Unicode C++ Examples

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(Unicode C++) Duplicate OpensSSL to Sign File and Output Binary DER

This example duplicates the following:

openssl smime -sign -in INPUT.xml -signer SIGN.PEM -passin pass:MYPASS -outform der -binary -nodetach -out SIGNED.P7M

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*...

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#include <CkCrypt2W.h>
#include <CkPemW.h>
#include <CkPrivateKeyW.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.

    CkCrypt2W crypt;

    //  Load the PEM containing cert + private key.
    CkPemW pem;
    bool success = pem.LoadPemFile(L"qa_data/pem/myPem.pem",L"password");
    if (success != true) {
        wprintf(L"%s\n",pem.lastErrorText());
        return;
    }

    CkPrivateKeyW *privkey = pem.GetPrivateKey(0);
    if (pem.get_LastMethodSuccess() != true) {
        wprintf(L"%s\n",pem.lastErrorText());
        return;
    }

    CkCertW *cert = pem.GetCert(0);
    if (pem.get_LastMethodSuccess() != true) {
        delete privkey;
        wprintf(L"%s\n",pem.lastErrorText());
        return;
    }

    success = crypt.SetSigningCert2(*cert,*privkey);
    if (success != true) {
        delete privkey;
        delete cert;
        wprintf(L"%s\n",crypt.lastErrorText());
        return;
    }

    delete privkey;
    delete cert;

    //  Alternatively, we could use a .pfx/.p12 file.
    //  (Chilkat also supports other formats/sources for cert/private keys...)
    CkCertW certFromP12;
    success = certFromP12.LoadPfxFile(L"qa_data/p12/myP12.p12",L"password");
    if (success != true) {
        wprintf(L"%s\n",certFromP12.lastErrorText());
        return;
    }

    //  The certificate, when loaded from a .pfx/.p12, will automatically
    //  include the associated private key, assuming it's present in the .p12.
    //  We don't have to explicitly provide the private key as in the
    //  lines of code above that use the PEM file.
    success = crypt.SetSigningCert(certFromP12);
    if (success != true) {
        wprintf(L"%s\n",crypt.lastErrorText());
        return;
    }

    //  Create the opaque signature (PKCS7 binary DER that contains both the signature and original file data).
    success = crypt.CreateP7M(L"qa_data/infile.anything",L"qa_output/outfile.p7m");
    if (success != true) {
        wprintf(L"%s\n",crypt.lastErrorText());
        return;
    }

    wprintf(L"Success.\n");
    }

 

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