Sign a JWS with an HMAC Key

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.SetMacKey, which sets the symmetric MAC key for a signature. The key bytes are supplied in a named encoding such as hex or base64.

#include <CkJws.h>
#include <CkJsonObject.h>

void ChilkatSample(void)
    {
    bool success = false;

    CkJws jws;

    //  Protected header specifying HMAC-SHA256.
    CkJsonObject header;
    header.UpdateString("alg","HS256");
    success = jws.SetProtectedHeader(0,header);
    if (success == false) {
        std::cout << jws.lastErrorText() << "\r\n";
        return;
    }

    bool bIncludeBom = false;
    success = jws.SetPayload("This is the content to sign.","utf-8",bIncludeBom);
    if (success == false) {
        std::cout << jws.lastErrorText() << "\r\n";
        return;
    }

    //  Set the symmetric MAC key for signature 0.  The key bytes are provided in the named encoding (here
    //  base64).  In production, obtain the key from a secure source rather than hard-coding it.
    const char *base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=";
    success = jws.SetMacKey(0,base64Key,"base64");
    if (success == false) {
        std::cout << jws.lastErrorText() << "\r\n";
        return;
    }

    const char *jwsCompact = jws.createJws();
    if (jws.get_LastMethodSuccess() == false) {
        std::cout << jws.lastErrorText() << "\r\n";
        return;
    }

    std::cout << jwsCompact << "\r\n";
    }