Unicode C++

Validate JWS Using RSASSA-PKCS1-v1_5 SHA-256

See more JSON Web Signatures (JWS) Examples

Validates a JSON Web Signature (JWS) that uses RSASSA-PKCS1-v1_5 SHA-256. Unicode C++

#include <CkStringBuilderW.h>
#include <CkPublicKeyW.h>
#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 an RSA public key to validate and recover the protected header and payload.

    //  We only need a public key for signature validation.  This is the RSA public key
    //  that is used:

    //       {"kty":"RSA", 
    //        "n":"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx
    //             HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs
    //             D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH
    //             SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV
    //             MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8
    //             NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ", 
    //        "e":"AQAB"
    //       }

    CkStringBuilderW sbPubKey;
    sbPubKey.Append(L"{\"kty\":\"RSA\",");
    sbPubKey.Append(L"\"n\":\"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx");
    sbPubKey.Append(L"HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs");
    sbPubKey.Append(L"D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH");
    sbPubKey.Append(L"SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV");
    sbPubKey.Append(L"MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8");
    sbPubKey.Append(L"NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ\",");
    sbPubKey.Append(L"\"e\":\"AQAB\"");
    sbPubKey.Append(L"}");

    CkPublicKeyW pubKey;
    success = pubKey.LoadFromString(sbPubKey.getAsString());
    if (success == false) {
        wprintf(L"%s\n",pubKey.lastErrorText());
        return;
    }

    CkJwsW jws;

    //  Set the RSA public key:
    int signatureIndex = 0;
    jws.SetPublicKey(signatureIndex,pubKey);

    //  Load the JWS.
    CkStringBuilderW sbJws;
    sbJws.Append(L"eyJhbGciOiJSUzI1NiJ9");
    sbJws.Append(L".");
    sbJws.Append(L"eyJpc3MiOiJqb2UiLA0KICJleHAiOjEzMDA4MTkzODAsDQogImh0dHA6Ly9leGFt");
    sbJws.Append(L"cGxlLmNvbS9pc19yb290Ijp0cnVlfQ");
    sbJws.Append(L".");
    sbJws.Append(L"cC4hiUPoj9Eetdgtv3hF80EGrhuB__dzERat0XF9g2VtQgr9PJbu3XOiZj5RZmh7");
    sbJws.Append(L"AAuHIm4Bh-0Qc_lF5YKt_O8W2Fp5jujGbds9uJdbF9CUAr7t1dnZcAcQjbKBYNX4");
    sbJws.Append(L"BAynRFdiuB--f_nZLgrnbyTyWzO75vRK5h6xBArLIARNPvkSjtQBMHlb1L07Qe7K");
    sbJws.Append(L"0GarZRmB_eSN9383LcOLn6_dO--xi12jzDwusC-eOkHWEsqtFZESc6BfI7noOPqv");
    sbJws.Append(L"hJ1phCnvWh6IeYI2w9QOYEUipUTI8np6LbgGY9Fs98rqVt5AXLIhWkWywlVmtVrB");
    sbJws.Append(L"p0igcN_IoypGlUPQGe77Rw");

    success = jws.LoadJwsSb(sbJws);
    if (success == false) {
        wprintf(L"%s\n",jws.lastErrorText());
        return;
    }

    //  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 RSA key was incorrect, the JWS was invalid, or both.\n");
        return;
    }

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

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

    //  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:
    //  	{ 
    //  	  "alg": "RS256"
    //  	}
    }