(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_CkPfx.h>
#include <C_CkPrivateKey.h>
#include <C_CkRsa.h>
#include <C_CkCrypt2.h>
#include <C_CkBinData.h>

void ChilkatSample(void)
    {
    BOOL success;
    const char *concatenatedParams;
    HCkPfx pfx;
    HCkPrivateKey privKey;
    HCkRsa rsa;
    const char *hexSig;
    HCkCrypt2 crypt;
    HCkBinData bd;
    const char *md5_summary;

    success = FALSE;

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

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

    // Get the private key from a pfx file.
    pfx = CkPfx_Create();
    success = CkPfx_LoadPfxFile(pfx,"qa_data/pfx/cert_test123.pfx","test123");
    if (success == FALSE) {
        printf("%s\n",CkPfx_lastErrorText(pfx));
        CkPfx_Dispose(pfx);
        return;
    }

    privKey = CkPrivateKey_Create();
    success = CkPfx_PrivateKeyAt(pfx,0,privKey);
    if (success == FALSE) {
        printf("%s\n",CkPfx_lastErrorText(pfx));
        CkPfx_Dispose(pfx);
        CkPrivateKey_Dispose(privKey);
        return;
    }

    // Create IIC signature according to RSASSA-PKCS-v1_5 using SHA256
    rsa = CkRsa_Create();
    success = CkRsa_UsePrivateKey(rsa,privKey);
    if (success == FALSE) {
        printf("%s\n",CkRsa_lastErrorText(rsa));
        CkPfx_Dispose(pfx);
        CkPrivateKey_Dispose(privKey);
        CkRsa_Dispose(rsa);
        return;
    }

    // PKCS-v1_5 is used by default.
    CkRsa_putEncodingMode(rsa,"hex");
    CkRsa_putCharset(rsa,"utf-8");
    hexSig = CkRsa_signStringENC(rsa,concatenatedParams,"sha256");

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

    // Compute the MD5 hash of the bytes.
    crypt = CkCrypt2_Create();
    CkCrypt2_putEncodingMode(crypt,"hex");
    CkCrypt2_putHashAlgorithm(crypt,"md5");
    bd = CkBinData_Create();
    CkBinData_AppendEncoded(bd,hexSig,"hex");
    md5_summary = CkCrypt2_hashBdENC(crypt,bd);

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


    CkPfx_Dispose(pfx);
    CkPrivateKey_Dispose(privKey);
    CkRsa_Dispose(rsa);
    CkCrypt2_Dispose(crypt);
    CkBinData_Dispose(bd);

    }