Unicode 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*...

Unicode C

#include <C_CkCrypt2W.h>
#include <C_CkCertW.h>
#include <C_CkBinDataW.h>
#include <C_CkPrivateKeyW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkCrypt2W crypt;
    HCkCertW cert;
    HCkBinDataW bd;
    HCkPrivateKeyW privkey;

    success = FALSE;

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

    crypt = CkCrypt2W_Create();

    // Load the cert and private key from separate files.
    cert = CkCertW_Create();
    success = CkCertW_LoadFromFile(cert,L"myCert.crt");
    if (success != TRUE) {
        wprintf(L"%s\n",CkCertW_lastErrorText(cert));
        CkCrypt2W_Dispose(crypt);
        CkCertW_Dispose(cert);
        return;
    }

    bd = CkBinDataW_Create();
    success = CkBinDataW_LoadFile(bd,L"cert.key");
    privkey = CkPrivateKeyW_Create();
    // Load from any format private key.
    // If the file does not need a password, the 2nd arg is ignored.
    success = CkPrivateKeyW_LoadAnyFormat(privkey,bd,L"password_if_needed");
    if (success != TRUE) {
        wprintf(L"%s\n",CkPrivateKeyW_lastErrorText(privkey));
        CkCrypt2W_Dispose(crypt);
        CkCertW_Dispose(cert);
        CkBinDataW_Dispose(bd);
        CkPrivateKeyW_Dispose(privkey);
        return;
    }

    success = CkCrypt2W_SetSigningCert2(crypt,cert,privkey);
    if (success != TRUE) {
        wprintf(L"%s\n",CkCrypt2W_lastErrorText(crypt));
        CkCrypt2W_Dispose(crypt);
        CkCertW_Dispose(cert);
        CkBinDataW_Dispose(bd);
        CkPrivateKeyW_Dispose(privkey);
        return;
    }

    // Create the opaque signature (PKCS7 binary DER that contains both the signature and original file data).
    success = CkCrypt2W_CreateP7M(crypt,L"qa_data/infile.anything",L"qa_output/outfile.der");
    if (success != TRUE) {
        wprintf(L"%s\n",CkCrypt2W_lastErrorText(crypt));
        CkCrypt2W_Dispose(crypt);
        CkCertW_Dispose(cert);
        CkBinDataW_Dispose(bd);
        CkPrivateKeyW_Dispose(privkey);
        return;
    }

    wprintf(L"Success.\n");


    CkCrypt2W_Dispose(crypt);
    CkCertW_Dispose(cert);
    CkBinDataW_Dispose(bd);
    CkPrivateKeyW_Dispose(privkey);

    }