(C) Create Egypt ITIDA CAdES-BES .p7s Signature (with strings in-memory)

See more Egypt ITIDA Examples

Demonstrates how to create a .p7s signature that fits Egypt's ITIDA requirements.

Note: This example requires Chilkat v9.5.0.75 or greater.

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#include <C_CkCrypt2.h>
#include <C_CkCert.h>
#include <C_CkJsonObject.h>

void ChilkatSample(void)
    {
    HCkCrypt2 crypt;
    HCkCert cert;
    BOOL success;
    HCkJsonObject cmsOptions;
    HCkJsonObject jsonSigningAttrs;
    const char *textToSign;
    const char *sigBase64;

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

    crypt = CkCrypt2_Create();

    cert = CkCert_Create();

    // There are many ways to load the certificate.  
    // This example was created for a customer using an ePass2003 USB token.
    // Assuming the USB token is the only source of a hardware-based private key..
    success = CkCert_LoadFromSmartcard(cert,"");
    if (success != TRUE) {
        printf("%s\n",CkCert_lastErrorText(cert));
        CkCrypt2_Dispose(crypt);
        CkCert_Dispose(cert);
        return;
    }

    // Tell the crypt component to use this cert.
    success = CkCrypt2_SetSigningCert(crypt,cert);
    if (success != TRUE) {
        printf("%s\n",CkCrypt2_lastErrorText(crypt));
        CkCrypt2_Dispose(crypt);
        CkCert_Dispose(cert);
        return;
    }

    cmsOptions = CkJsonObject_Create();
    // Setting "DigestData" causes OID 1.2.840.113549.1.7.5 (digestData) to be used.
    CkJsonObject_UpdateBool(cmsOptions,"DigestData",TRUE);
    CkJsonObject_UpdateBool(cmsOptions,"OmitAlgorithmIdNull",TRUE);
    CkCrypt2_putCmsOptions(crypt,CkJsonObject_emit(cmsOptions));

    // The CadesEnabled property applies to all methods that create CMS/PKCS7 signatures. 
    // To create a CAdES-BES signature, set this property equal to true. 
    CkCrypt2_putCadesEnabled(crypt,TRUE);

    CkCrypt2_putHashAlgorithm(crypt,"sha256");

    jsonSigningAttrs = CkJsonObject_Create();
    CkJsonObject_UpdateInt(jsonSigningAttrs,"contentType",1);
    CkJsonObject_UpdateInt(jsonSigningAttrs,"signingTime",1);
    CkJsonObject_UpdateInt(jsonSigningAttrs,"messageDigest",1);
    CkJsonObject_UpdateInt(jsonSigningAttrs,"signingCertificateV2",1);
    CkCrypt2_putSigningAttributes(crypt,CkJsonObject_emit(jsonSigningAttrs));

    // By default, all the certs in the chain of authentication are included in the signature.
    // If desired, we can choose to only include the signing certificate:
    CkCrypt2_putIncludeCertChain(crypt,FALSE);

    // Make sure we sign the utf-8 byte representation of the JSON string
    CkCrypt2_putCharset(crypt,"utf-8");

    // Create the CAdES-BES signature.
    textToSign = "\"issuer\"\"address\"\"branchID\"\"0\"\"country\"\"EG\"\"regionCity...";

    CkCrypt2_putEncodingMode(crypt,"base64");
    sigBase64 = CkCrypt2_signStringENC(crypt,textToSign);
    if (CkCrypt2_getLastMethodSuccess(crypt) == FALSE) {
        printf("%s\n",CkCrypt2_lastErrorText(crypt));
        CkCrypt2_Dispose(crypt);
        CkCert_Dispose(cert);
        CkJsonObject_Dispose(cmsOptions);
        CkJsonObject_Dispose(jsonSigningAttrs);
        return;
    }

    printf("Base64 signature:\n");
    printf("%s\n",sigBase64);


    CkCrypt2_Dispose(crypt);
    CkCert_Dispose(cert);
    CkJsonObject_Dispose(cmsOptions);
    CkJsonObject_Dispose(jsonSigningAttrs);

    }