(MFC) IKOF Generation Code for Montenegro Fiscalization Service

Demonstrates computing the IKOF MD5 summary value as described in section 4.3 of this document: https://poreskauprava.gov.me/ResourceManager/FileDownload.aspx?rId=416042&rType=2

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkPfx.h>
#include <CkPrivateKey.h>
#include <CkRsa.h>
#include <CkCrypt2.h>
#include <CkBinData.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    const char *concatenatedParams = "12345678|2019-06-12T17:05:43+02:00|9952|bb123bb1231|cc123cc1231|ss123ss123|199.01";

    // Get the private key from a pfx file.
    CkPfx pfx;
    bool success = pfx.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123");
    if (success != true) {
        strOut.append(pfx.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    CkPrivateKey *privKey = pfx.GetPrivateKey(0);
    if (pfx.get_LastMethodSuccess() == false) {
        strOut.append(pfx.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Create IIC signature according to RSASSA-PKCS-v1_5 using SHA256
    CkRsa rsa;
    success = rsa.ImportPrivateKeyObj(*privKey);
    if (success == false) {
        strOut.append(rsa.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // PKCS-v1_5 is used by default.
    rsa.put_EncodingMode("hex");
    rsa.put_Charset("utf-8");
    const char *hexSig = rsa.signStringENC(concatenatedParams,"sha256");

    strOut.append("Signature value result is: ");
    strOut.append(hexSig);
    strOut.append("\r\n");

    // Compute the MD5 hash of the bytes.
    CkCrypt2 crypt;
    crypt.put_EncodingMode("hex");
    crypt.put_HashAlgorithm("md5");
    CkBinData bd;
    bd.AppendEncoded(hexSig,"hex");
    const char *md5_summary = crypt.hashBdENC(bd);

    strOut.append("MD5 summary value is: ");
    strOut.append(md5_summary);
    strOut.append("\r\n");

    delete privKey;


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }