Unicode C++

Create JWS Using Private Key on a Smart Card

See more JSON Web Signatures (JWS) Examples

Creates and validates a JSON Web Signature (JWS) using the private key associated with a certificate on a smart card. Unicode C++

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

void ChilkatSample(void)
    {
    bool success = false;

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

    //  Load the certificate from a smart card.
    CkCertW cert;

    //  Set the smarcard PIN prior to loading
    cert.put_SmartCardPin(L"123456");

    //  Detect the connected smartcard or USB security token and load the default certificate.
    success = cert.LoadFromSmartcard(L"");
    if (success == false) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    //  Note: Chilkat provides many different ways to load a certificate from a smartcard or USB token,
    //  such as selecting a certificate if the card contains multiple certificates with private keys,
    //  or working with lower-level PKCS11 or ScMinidriver API's (both of which Chilkat provides).

    //  Create the JWS Protected Header
    CkJsonObjectW jwsProtHdr;

    if (cert.IsEcdsa() == true) {
        jwsProtHdr.AppendString(L"alg",L"ES256");
    }
    else {
        jwsProtHdr.AppendString(L"alg",L"RS256");
    }

    CkJwsW jws;

    //  Set the protected header:
    int signatureIndex = 0;
    jws.SetProtectedHeader(signatureIndex,jwsProtHdr);

    //  Provide the private key via the certificate.
    //  This requires Chilkat v11.5.0 or greater.
    jws.SetSigningCert(signatureIndex,cert);

    //  Set the payload.
    bool bIncludeBom = false;
    const wchar_t *payloadStr = L"In our village, folks say God crumbles up the old moon into stars.";
    jws.SetPayload(payloadStr,L"utf-8",bIncludeBom);

    //  Create the JWS
    //  By default, the compact serialization is used.
    const wchar_t *jwsCompact = jws.createJws();
    if (jws.get_LastMethodSuccess() == false) {
        wprintf(L"%s\n",jws.lastErrorText());
        return;
    }

    wprintf(L"JWS: %s\n",jwsCompact);

    //  sample output:
    //  JWS: eyJhbGciOiJQUzI1NiJ9.SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu.TRWhwRo5dMv9-8OzrInfJTwmUGYgjLfHk8lqF072ND-FmLWEBnUTOpY8oJXp8FdWw2SalbdOeNlrtlJjwk4XK8Ql2iJ_2qMCtxsvLPhKBOqFoAF4aBvTOEDVJDxf0DaBSiydEEtfTVV2iwBcjWabu5J2XieR5y7QZQtuHsn7T3qKBvCcCejN3Y2oqAT3qMHvu1fTms1r_91wBn_K7Wjd9UkZ1n02qQcUHJznR_OF2BgN7_KWIDAF9ZS9keoju2NPpPelO4yxa2XUPnehY3G7dHKoCxUEQR4d2Xc5voqDASTVCDqQS4PVOZdvT3Ein6-SanAlCwbWBbkvT8g6-5PImQ

    //  Now load the JWS, validate, and recover the original text.
    CkJwsW jws2;

    //  Load the JWS.
    success = jws2.LoadJws(jwsCompact);

    CkPublicKeyW pubKey;
    cert.GetPublicKey(pubKey);

    //  Set the public key used for validation.
    signatureIndex = 0;
    jws2.SetPublicKey(signatureIndex,pubKey);

    //  Validate the 1st (and only) signature at index 0..
    int v = jws2.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",jws2.lastErrorText());
        return;
    }

    if (v == 0) {
        wprintf(L"Invalid signature.  The 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"%s\n",jws2.getPayload(L"utf-8"));

    //  Examine the protected header:

    CkJsonObjectW joseHeader;
    success = jws2.GetProtectedH(signatureIndex,joseHeader);
    if (success == false) {
        wprintf(L"%s\n",jws2.lastErrorText());
        return;
    }

    joseHeader.put_EmitCompact(false);

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

    //  Output:

    //  	Signature validated.
    //  	In our village, folks say God crumbles up the old moon into stars.
    //  	Protected (JOSE) header:
    //  	{ 
    //  	  "alg": "RS256"
    //  	}
    }