Unicode C

Create JWT Using HS256, HS384, or HS512

See more JSON Web Token (JWT) Examples

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

Unicode C

#include <C_CkJwtW.h>
#include <C_CkJsonObjectW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkJwtW jwt;
    HCkJsonObjectW jose;
    HCkJsonObjectW claims;
    int curDateTime;
    const wchar_t *strJwt;

    success = FALSE;

    // 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.

    jwt = CkJwtW_Create();

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

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

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

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

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

    // Produce the smallest possible JWT:
    CkJwtW_putAutoCompact(jwt,TRUE);

    strJwt = CkJwtW_createJwt(jwt,CkJsonObjectW_emit(jose),CkJsonObjectW_emit(claims),L"secret");

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


    CkJwtW_Dispose(jwt);
    CkJsonObjectW_Dispose(jose);
    CkJsonObjectW_Dispose(claims);

    }