(Unicode C) 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

Note: This example requires Chilkat v11.0.0 or greater.

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#include <C_CkPfxW.h>
#include <C_CkPrivateKeyW.h>
#include <C_CkRsaW.h>
#include <C_CkCrypt2W.h>
#include <C_CkBinDataW.h>

void ChilkatSample(void)
    {
    BOOL success;
    const wchar_t *concatenatedParams;
    HCkPfxW pfx;
    HCkPrivateKeyW privKey;
    HCkRsaW rsa;
    const wchar_t *hexSig;
    HCkCrypt2W crypt;
    HCkBinDataW bd;
    const wchar_t *md5_summary;

    success = FALSE;

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

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

    // Get the private key from a pfx file.
    pfx = CkPfxW_Create();
    success = CkPfxW_LoadPfxFile(pfx,L"qa_data/pfx/cert_test123.pfx",L"test123");
    if (success == FALSE) {
        wprintf(L"%s\n",CkPfxW_lastErrorText(pfx));
        CkPfxW_Dispose(pfx);
        return;
    }

    privKey = CkPrivateKeyW_Create();
    success = CkPfxW_PrivateKeyAt(pfx,0,privKey);
    if (success == FALSE) {
        wprintf(L"%s\n",CkPfxW_lastErrorText(pfx));
        CkPfxW_Dispose(pfx);
        CkPrivateKeyW_Dispose(privKey);
        return;
    }

    // Create IIC signature according to RSASSA-PKCS-v1_5 using SHA256
    rsa = CkRsaW_Create();
    success = CkRsaW_UsePrivateKey(rsa,privKey);
    if (success == FALSE) {
        wprintf(L"%s\n",CkRsaW_lastErrorText(rsa));
        CkPfxW_Dispose(pfx);
        CkPrivateKeyW_Dispose(privKey);
        CkRsaW_Dispose(rsa);
        return;
    }

    // PKCS-v1_5 is used by default.
    CkRsaW_putEncodingMode(rsa,L"hex");
    CkRsaW_putCharset(rsa,L"utf-8");
    hexSig = CkRsaW_signStringENC(rsa,concatenatedParams,L"sha256");

    wprintf(L"Signature value result is: %s\n",hexSig);

    // Compute the MD5 hash of the bytes.
    crypt = CkCrypt2W_Create();
    CkCrypt2W_putEncodingMode(crypt,L"hex");
    CkCrypt2W_putHashAlgorithm(crypt,L"md5");
    bd = CkBinDataW_Create();
    CkBinDataW_AppendEncoded(bd,hexSig,L"hex");
    md5_summary = CkCrypt2W_hashBdENC(crypt,bd);

    wprintf(L"MD5 summary value is: %s\n",md5_summary);


    CkPfxW_Dispose(pfx);
    CkPrivateKeyW_Dispose(privKey);
    CkRsaW_Dispose(rsa);
    CkCrypt2W_Dispose(crypt);
    CkBinDataW_Dispose(bd);

    }