(C) Sign Mexico Pedimento

Add a signature to a Mexico pedimento file.

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#include <C_CkStringBuilder.h>
#include <C_CkPrivateKey.h>
#include <C_CkXml.h>
#include <C_CkAsn.h>
#include <C_CkRsa.h>
#include <C_CkBinData.h>
#include <C_CkCert.h>

void ChilkatSample(void)
    {
    BOOL success;
    BOOL bCRLF;
    HCkStringBuilder sb;
    const char *md5_base64;
    HCkPrivateKey privKey;
    HCkXml xml;
    HCkAsn asn;
    HCkRsa rsa;
    HCkBinData bdSig;
    HCkCert cert;
    const char *serialHex;
    HCkStringBuilder sbSerial;
    int numReplaced;

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

    // 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.
    bCRLF = TRUE;
    sb = CkStringBuilder_Create();
    // Use CRLF line endings.
    CkStringBuilder_AppendLine(sb,"500|1|3621|4199800|400||",bCRLF);
    CkStringBuilder_AppendLine(sb,"601|3621|4199800|400|IN|1||EKU9003173C9|EKU9003173C9FRNN09|1||",bCRLF);
    CkStringBuilder_AppendLine(sb,"507|4199800|IM|2006-7888">",bCRLF);
    CkStringBuilder_AppendLine(sb,"507|4199800|MS|2">",bCRLF);

    // Generate the MD5 hash of what we have so far..
    md5_base64 = CkStringBuilder_getHash(sb,"md5","base64","utf-8");
    printf("MD5 hash = %s\n",md5_base64);

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

    // We're going to sign the MD5 hash using the private key.
    privKey = CkPrivateKey_Create();
    success = CkPrivateKey_LoadAnyFormatFile(privKey,"qa_data/certs/mexico_test/Certificados_de_Prueba/Certificados_Pruebas/Personas Morales/EKU9003173C9_20230517223532/CSD_EKU9003173C9_20230517223903/CSD_Sucursal_1_EKU9003173C9_20230517_223850.key","12345678a");
    if (success == FALSE) {
        printf("%s\n",CkPrivateKey_lastErrorText(privKey));
        CkStringBuilder_Dispose(sb);
        CkPrivateKey_Dispose(privKey);
        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>

    xml = CkXml_Create();
    CkXml_putTag(xml,"sequence");
    CkXml_UpdateChildContent(xml,"sequence|oid","1.2.840.113549.2.5");
    CkXml_UpdateChildContent(xml,"sequence|null","");
    CkXml_UpdateChildContent(xml,"octets",md5_base64);

    asn = CkAsn_Create();
    CkAsn_LoadAsnXml(asn,CkXml_getXml(xml));
    printf("ASN.1 = %s\n",CkAsn_getEncodedDer(asn,"base64"));

    // Sign with the private key.
    rsa = CkRsa_Create();
    success = CkRsa_ImportPrivateKeyObj(rsa,privKey);
    if (success == FALSE) {
        printf("%s\n",CkRsa_lastErrorText(rsa));
        CkStringBuilder_Dispose(sb);
        CkPrivateKey_Dispose(privKey);
        CkXml_Dispose(xml);
        CkAsn_Dispose(asn);
        CkRsa_Dispose(rsa);
        return;
    }

    // Create the opaque signature.
    bdSig = CkBinData_Create();
    CkBinData_AppendEncoded(bdSig,CkAsn_getEncodedDer(asn,"base64"),"base64");
    success = CkRsa_OpenSslSignBd(rsa,bdSig);
    if (success == FALSE) {
        printf("%s\n",CkRsa_lastErrorText(rsa));
        CkStringBuilder_Dispose(sb);
        CkPrivateKey_Dispose(privKey);
        CkXml_Dispose(xml);
        CkAsn_Dispose(asn);
        CkRsa_Dispose(rsa);
        CkBinData_Dispose(bdSig);
        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|

    cert = CkCert_Create();
    success = CkCert_LoadFromFile(cert,"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) {
        printf("%s\n",CkCert_lastErrorText(cert));
        CkStringBuilder_Dispose(sb);
        CkPrivateKey_Dispose(privKey);
        CkXml_Dispose(xml);
        CkAsn_Dispose(asn);
        CkRsa_Dispose(rsa);
        CkBinData_Dispose(bdSig);
        CkCert_Dispose(cert);
        return;
    }

    serialHex = CkCert_serialNumber(cert);
    // The serial in hex form looks like this:   3330303031303030303030353030303033343136
    // Decode to us-ascii.
    sbSerial = CkStringBuilder_Create();
    CkStringBuilder_DecodeAndAppend(sbSerial,serialHex,"hex","us-ascii");
    printf("serial number in us-ascii: %s\n",CkStringBuilder_getAsString(sbSerial));

    numReplaced = CkStringBuilder_Replace(sb,"CERT_SERIAL",CkStringBuilder_getAsString(sbSerial));
    numReplaced = CkStringBuilder_Replace(sb,"BASE64_SIGNATURE",CkBinData_getEncoded(bdSig,"base64"));

    printf("------------------------------------\n");
    printf("Result:\n");
    printf("%s\n",CkStringBuilder_getAsString(sb));


    CkStringBuilder_Dispose(sb);
    CkPrivateKey_Dispose(privKey);
    CkXml_Dispose(xml);
    CkAsn_Dispose(asn);
    CkRsa_Dispose(rsa);
    CkBinData_Dispose(bdSig);
    CkCert_Dispose(cert);
    CkStringBuilder_Dispose(sbSerial);

    }