Unicode C++

Validate JWS Using HMAC SHA-256

See more JSON Web Signatures (JWS) Examples

Validates a JSON Web Signature (JWS) using HMAC SHA-256. Unicode C++

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

void ChilkatSample(void)
    {
    bool success = false;

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

    //  This example takes a JSON signature in compact serialization format,
    //  and uses a MAC key to validate and recover the protected header and payload.

    CkJwsW jws;

    //  Set the HMAC key:
    const wchar_t *hmacKey = L"AyM1SysPpbyDfgZld3umj1qzKObwVMkoqQ-EstJQLr_T-1qS0gZH75aKtMN3Yj0iPS4hcgUuTwjAzZr1Z9CAow";
    int signatureIndex = 0;
    jws.SetMacKey(signatureIndex,hmacKey,L"base64url");

    //  Load the JWS.
    const wchar_t *jwsCompact = L"eyJ0eXAiOiJKV1QiLA0KICJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJqb2UiLA0KICJleHAiOjEzMDA4MTkzODAsDQogImh0dHA6Ly9leGFtcGxlLmNvbS9pc19yb290Ijp0cnVlfQ.dBjftJeZ4CVP-mB92K27uhbUJU1p1r_wW1gFWFOEjXk";
    success = jws.LoadJws(jwsCompact);

    //  Validate the 1st (and only) signature at index 0..
    int v = jws.Validate(signatureIndex);
    if (v < 0) {
        //  Perhaps Chilkat was not unlocked or the trial expired..
        wprintf(L"Method call failed for some other reason.\n");
        wprintf(L"%s\n",jws.lastErrorText());
        return;
    }

    if (v == 0) {
        wprintf(L"Invalid signature.  The MAC key was incorrect, the JWS was invalid, or both.\n");
        return;
    }

    //  If we get here, the signature was validated..
    wprintf(L"Signature validated.\n");

    //  Recover the original content:
    wprintf(L"Recovered content:\n");
    wprintf(L"%s\n",jws.getPayload(L"utf-8"));

    //  Examine the protected header:

    CkJsonObjectW joseHeader;
    success = jws.GetProtectedH(signatureIndex,joseHeader);
    if (success == false) {
        wprintf(L"%s\n",jws.lastErrorText());
        return;
    }

    joseHeader.put_EmitCompact(false);

    wprintf(L"Protected (JOSE) header:\n");
    wprintf(L"%s\n",joseHeader.emit());

    //  Output:

    //  	Signature validated.
    //  	Recovered content:
    //  	{"iss":"joe",
    //  	 "exp":1300819380,
    //  	 "http://example.com/is_root":true}
    //  	Protected (JOSE) header:
    //  	{ 
    //  	  "typ": "JWT",
    //  	  "alg": "HS256"
    //  	}
    }