(Unicode C++) Create JWT Using HS256, HS384, or HS512

Demonstrates how to create a JWT using HS256, HS384, or HS512. (HS256 is JWT's acronym for HMAC-SHA256.) When HMAC is used, the secret is a shared secret (i.e. password) that both client and server know beforehand.

This example also demonstrates how to include time constraints:

• nbf: Not Before Time
• exp: Expiration Time
• iat: Issue At Time

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#include <CkJwtW.h>
#include <CkJsonObjectW.h>

void ChilkatSample(void)
    {
    // Demonstrates how to create an HMAC JWT using a shared secret (password).

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

    CkJwtW jwt;

    // Build the JOSE header
    CkJsonObjectW jose;
    // Use HS256.  Pass the string "HS384" or "HS512" to use a different algorithm.
    bool success = jose.AppendString(L"alg",L"HS256");
    success = jose.AppendString(L"typ",L"JWT");

    // Now build the JWT claims (also known as the payload)
    CkJsonObjectW claims;
    success = claims.AppendString(L"iss",L"http://example.org");
    success = claims.AppendString(L"sub",L"John");
    success = claims.AppendString(L"aud",L"http://example.com");

    // Set the timestamp of when the JWT was created to now.
    int curDateTime = jwt.GenNumericDate(0);
    success = claims.AddIntAt(-1,L"iat",curDateTime);

    // Set the "not process before" timestamp to now.
    success = claims.AddIntAt(-1,L"nbf",curDateTime);

    // Set the timestamp defining an expiration time (end time) for the token
    // to be now + 1 hour (3600 seconds)
    success = claims.AddIntAt(-1,L"exp",curDateTime + 3600);

    // Produce the smallest possible JWT:
    jwt.put_AutoCompact(true);

    const wchar_t *strJwt = jwt.createJwt(jose.emit(),claims.emit(),L"secret");

    wprintf(L"%s\n",strJwt);
    }