Unicode C++

Get a JWS Protected Header

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.GetProtectedH, which copies the decoded protected header of a signature into a JsonObject.

Background. The protected header is integrity-protected by the signature. Inspecting it (for example the alg value) is useful before deciding how to validate.

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Unicode C++

#include <CkJwsW.h>
#include <CkJsonObjectW.h>

void ChilkatSample(void)
    {
    bool success = false;

    CkJwsW jws;

    //  Load the JWS compact serialization.
    const wchar_t *jwsCompact = L"eyJhbGciOiJIUzI1NiJ9.VGhpcyBpcyB0aGUgY29udGVudCB0byBzaWduLg.<signature>";
    success = jws.LoadJws(jwsCompact);
    if (success == false) {
        wprintf(L"%s\n",jws.lastErrorText());
        return;
    }

    //  Copy the decoded protected header of signature 0 into a JsonObject.
    CkJsonObjectW json;
    success = jws.GetProtectedH(0,json);
    if (success == false) {
        wprintf(L"%s\n",jws.lastErrorText());
        return;
    }

    json.put_EmitCompact(false);
    wprintf(L"%s\n",json.emit());
    }