Unicode C

Sign JSON to Create CAdES P7S Bytes

See more CAdES Examples

Demonstrates how to sign JSON using a certificate + private key from a .p12/.pfx to create a CAdES P7S byte array. Unicode C

#include <C_CkCrypt2W.h>
#include <C_CkCertW.h>
#include <C_CkJsonObjectW.h>
#include <C_CkByteData.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkCrypt2W crypt;
    HCkCertW cert;
    HCkJsonObjectW jsonSigningAttrs;
    HCkByteData cadesP7s;
    const wchar_t *originalJson;

    success = FALSE;

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

    crypt = CkCrypt2W_Create();

    cert = CkCertW_Create();
    success = CkCertW_LoadPfxFile(cert,L"qa_data/pfx/cert_test123.pfx",L"test123");
    if (success != TRUE) {
        wprintf(L"%s\n",CkCertW_lastErrorText(cert));
        CkCrypt2W_Dispose(crypt);
        CkCertW_Dispose(cert);
        return;
    }

    //  Tell the crypt component to use this cert.
    success = CkCrypt2W_SetSigningCert(crypt,cert);
    if (success != TRUE) {
        wprintf(L"%s\n",CkCrypt2W_lastErrorText(crypt));
        CkCrypt2W_Dispose(crypt);
        CkCertW_Dispose(cert);
        return;
    }

    //  The CadesEnabled property applies to all methods that create PKCS7 signatures. 
    //  To create a CAdES-BES signature, set this property equal to true. 
    CkCrypt2W_putCadesEnabled(crypt,TRUE);

    CkCrypt2W_putHashAlgorithm(crypt,L"sha256");

    jsonSigningAttrs = CkJsonObjectW_Create();
    CkJsonObjectW_UpdateInt(jsonSigningAttrs,L"contentType",1);
    CkJsonObjectW_UpdateInt(jsonSigningAttrs,L"signingTime",1);
    CkJsonObjectW_UpdateInt(jsonSigningAttrs,L"messageDigest",1);
    CkJsonObjectW_UpdateInt(jsonSigningAttrs,L"signingCertificateV2",1);
    CkCrypt2W_putSigningAttributes(crypt,CkJsonObjectW_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:
    CkCrypt2W_putIncludeCertChain(crypt,FALSE);

    //  Create the CAdES-BES attached signature, which contains the original data.
    CkCrypt2W_putCharset(crypt,L"utf-8");
    cadesP7s = CkByteData_Create();
    success = CkCrypt2W_OpaqueSignString(crypt,L"{ \"abc\": 123}",cadesP7s);
    if (CkCrypt2W_getLastMethodSuccess(crypt) == FALSE) {
        wprintf(L"%s\n",CkCrypt2W_lastErrorText(crypt));
        CkCrypt2W_Dispose(crypt);
        CkCertW_Dispose(cert);
        CkJsonObjectW_Dispose(jsonSigningAttrs);
        CkByteData_Dispose(cadesP7s);
        return;
    }

    //  Verify the signature and extract the original JSON:
    originalJson = CkCrypt2W_opaqueVerifyString(crypt,cadesP7s);
    if (CkCrypt2W_getLastMethodSuccess(crypt) == FALSE) {
        wprintf(L"%s\n",CkCrypt2W_lastErrorText(crypt));
        CkCrypt2W_Dispose(crypt);
        CkCertW_Dispose(cert);
        CkJsonObjectW_Dispose(jsonSigningAttrs);
        CkByteData_Dispose(cadesP7s);
        return;
    }

    wprintf(L"Original JSON: %s\n",originalJson);

    wprintf(L"Success!\n");


    CkCrypt2W_Dispose(crypt);
    CkCertW_Dispose(cert);
    CkJsonObjectW_Dispose(jsonSigningAttrs);
    CkByteData_Dispose(cadesP7s);

    }