(Unicode C++) Create JWT using a Brainpool EC Key

See more JSON Web Token (JWT) Examples

Demonstrates how to create a JWT using an EC private key. This is for JOSE headers having an "alg" member with any of the following values:

• BP160R1
• BP192R1
• BP224R1
• BP256R1
• BP320R1
• BP384R1
• BP512R1

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

void ChilkatSample(void)
    {
    // Demonstrates how to create a JWT using a brainpool EC private key.

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

    CkPrivateKeyW privKey;

    // Load a brainpool EC key.
    bool success = privKey.LoadPemFile(L"c:/qa_data/pem/ec_brainpool_privKey.pem");
    if (success != true) {
        wprintf(L"%s\n",privKey.lastErrorText());
        return;
    }

    // You can examine the curve name of the key you just loaded by getting the private in XML format:
    // <ECCKeyValue curve="CURVE_NAME">...</ECCKeyValue>
    wprintf(L"%s\n",privKey.getXml());

    CkJwtW jwt;

    // Build the JOSE header
    CkJsonObjectW jose;
    // Use the brainpool curve name matching the private key you just loaded.
    // Use "BP256R1", or "BP384R1", etc.   
    success = jose.AppendString(L"alg",L"BP256R1");
    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);

    // Create the JWT token.  This is where the ECC signature is created.
    const wchar_t *token = jwt.createJwtPk(jose.emit(),claims.emit(),privKey);

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