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(Java) Create JWT Using HS256, HS384, or HS512Demonstrates 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:
import com.chilkatsoft.*; public class ChilkatExample { static { try { System.loadLibrary("chilkat"); } catch (UnsatisfiedLinkError e) { System.err.println("Native code library failed to load.\n" + e); System.exit(1); } } public static void main(String argv[]) { // 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. CkJwt jwt = new CkJwt(); // Build the JOSE header CkJsonObject jose = new CkJsonObject(); // Use HS256. Pass the string "HS384" or "HS512" to use a different algorithm. boolean success = jose.AppendString("alg","HS256"); success = jose.AppendString("typ","JWT"); // Now build the JWT claims (also known as the payload) CkJsonObject claims = new CkJsonObject(); success = claims.AppendString("iss","http://example.org"); success = claims.AppendString("sub","John"); success = claims.AppendString("aud","http://example.com"); // Set the timestamp of when the JWT was created to now. int curDateTime = jwt.GenNumericDate(0); success = claims.AddIntAt(-1,"iat",curDateTime); // Set the "not process before" timestamp to now. success = claims.AddIntAt(-1,"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,"exp",curDateTime+3600); // Produce the smallest possible JWT: jwt.put_AutoCompact(true); String strJwt = jwt.createJwt(jose.emit(),claims.emit(),"secret"); System.out.println(strJwt); } } |
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