(Unicode C++) Sign Mexico Pedimento

Add a signature to a Mexico pedimento file.

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#include <CkStringBuilderW.h>
#include <CkPrivateKeyW.h>
#include <CkXmlW.h>
#include <CkAsnW.h>
#include <CkRsaW.h>
#include <CkBinDataW.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.

    bool success;

    // This is the contents before signing:

    // 500|1|3621|4199800|400||
    // 601|3621|4199800|400|IN|1||EKU9003173C9|EKU9003173C9FRNN09|1||
    // 507|4199800|IM|2006-7888">
    // 507|4199800|MS|2">
    // 800|4199800|1">
    // 801|M3621037.222|1|5|011|

    // This is the contents after signing

    // 500|1|3621|4199800|400||
    // 601|3621|4199800|400|IN|1||EKU9003173C9|EKU9003173C9FRNN09|1||
    // 507|4199800|IM|2006-7888">
    // 507|4199800|MS|2">
    // 800|4199800|1|fhP2Ker54D2+3+UZch23F0E72 .... 9qNSPIuAqpj524qLZbbA==|30001000000500003416|
    // 801|M3621037.222|1|5|011|

    // First create the text to be signed.
    bool bCRLF = true;
    CkStringBuilderW sb;
    // Use CRLF line endings.
    sb.AppendLine(L"500|1|3621|4199800|400||",bCRLF);
    sb.AppendLine(L"601|3621|4199800|400|IN|1||EKU9003173C9|EKU9003173C9FRNN09|1||",bCRLF);
    sb.AppendLine(L"507|4199800|IM|2006-7888">",bCRLF);
    sb.AppendLine(L"507|4199800|MS|2">",bCRLF);

    // Generate the MD5 hash of what we have so far..
    const wchar_t *md5_base64 = sb.getHash(L"md5",L"base64",L"utf-8");
    wprintf(L"MD5 hash = %s\n",md5_base64);

    // Complete the original file.
    // After signing, we'll update the BASE64_SIGNATURE and CERT_SERIAL
    sb.AppendLine(L"800|4199800|1|BASE64_SIGNATURE|CERT_SERIAL|",bCRLF);
    sb.AppendLine(L"801|M3621037.222|1|5|011|",bCRLF);

    // We're going to sign the MD5 hash using the private key.
    CkPrivateKeyW privKey;
    success = privKey.LoadAnyFormatFile(L"qa_data/certs/mexico_test/Certificados_de_Prueba/Certificados_Pruebas/Personas Morales/EKU9003173C9_20230517223532/CSD_EKU9003173C9_20230517223903/CSD_Sucursal_1_EKU9003173C9_20230517_223850.key",L"12345678a");
    if (success == false) {
        wprintf(L"%s\n",privKey.lastErrorText());
        return;
    }

    // Generate the ASN.1 to be signed.

    // <sequence>
    //     <sequence>
    //         <oid>1.2.840.113549.2.5</oid>
    //         <null/>
    //     </sequence>
    //     <octets>SwxHfaJhG+N3pPqay6UzVA==</octets>
    // </sequence>

    CkXmlW xml;
    xml.put_Tag(L"sequence");
    xml.UpdateChildContent(L"sequence|oid",L"1.2.840.113549.2.5");
    xml.UpdateChildContent(L"sequence|null",L"");
    xml.UpdateChildContent(L"octets",md5_base64);

    CkAsnW asn;
    asn.LoadAsnXml(xml.getXml());
    wprintf(L"ASN.1 = %s\n",asn.getEncodedDer(L"base64"));

    // Sign with the private key.
    CkRsaW rsa;
    success = rsa.ImportPrivateKeyObj(privKey);
    if (success == false) {
        wprintf(L"%s\n",rsa.lastErrorText());
        return;
    }

    // Create the opaque signature.
    CkBinDataW bdSig;
    bdSig.AppendEncoded(asn.getEncodedDer(L"base64"),L"base64");
    success = rsa.OpenSslSignBd(bdSig);
    if (success == false) {
        wprintf(L"%s\n",rsa.lastErrorText());
        return;
    }

    // bd now contains the opaque signature, which embeds the ASN.1, which contains the MD5 hash.
    // We're going to add this line:
    // 800|4199800|1|BASE64_SIGNATURE|CERT_SERIAL_NUM|

    CkCertW cert;
    success = cert.LoadFromFile(L"qa_data/certs/mexico_test/Certificados_de_Prueba/Certificados_Pruebas/Personas Morales/EKU9003173C9_20230517223532/CSD_EKU9003173C9_20230517223903/CSD_Sucursal_1_EKU9003173C9_20230517_223850.cer");
    if (success == false) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    const wchar_t *serialHex = cert.serialNumber();
    // The serial in hex form looks like this:   3330303031303030303030353030303033343136
    // Decode to us-ascii.
    CkStringBuilderW sbSerial;
    sbSerial.DecodeAndAppend(serialHex,L"hex",L"us-ascii");
    wprintf(L"serial number in us-ascii: %s\n",sbSerial.getAsString());

    int numReplaced = sb.Replace(L"CERT_SERIAL",sbSerial.getAsString());
    numReplaced = sb.Replace(L"BASE64_SIGNATURE",bdSig.getEncoded(L"base64"));

    wprintf(L"------------------------------------\n");
    wprintf(L"Result:\n");
    wprintf(L"%s\n",sb.getAsString());
    }