Java

JWE using ECDH-ES, BP-256, A256GCM

See more JSON Web Encryption (JWE) Examples

Create a JWE with the following header:

	{
	  "alg": "ECDH-ES",
	  "enc": "A256GCM",
	  "exp": 1621957030,
	  "cty": "NJWT",
	  "epk": {
	    "kty": "EC",
	    "x": "QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w"
	    "y": "AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu"
	    "crv": "BP-256"
	  }
	}

Note: This example requires Chilkat v9.5.0.87 or greater.

Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.JsonObject;
import com.chilkatsoft.chilkat2.Jwe;
import com.chilkatsoft.chilkat2.Jwt;
import com.chilkatsoft.chilkat2.PublicKey;

public class ChilkatExample {

    public static void main(String[] args) {
        // This requires the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        // Load our brainpool BP-256 public key.

        //     {
        //       "use": "enc",
        //       "kid": "puk_idp_enc",
        //       "kty": "EC",
        //       "crv": "BP-256",
        //       "x": "QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w",
        //       "y": "AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu"
        //     }

        JsonObject json = new JsonObject();
        json.updateString("use", "enc");
        json.updateString("kid", "puk_idp_enc");
        json.updateString("kty", "EC");
        json.updateString("crv", "BP-256");
        json.updateString("x", "QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w");
        json.updateString("y", "AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu");

        PublicKey pubkey = new PublicKey();

        try {
            pubkey.loadFromString(json.emit());
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Build our protected header:

        //     {
        //       "alg": "ECDH-ES",
        //       "enc": "A256GCM",
        //       "exp": 1621957030,
        //       "cty": "NJWT",
        //       "epk": {
        //         "kty": "EC",
        //         "x": "QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w"
        //         "y": "AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu"
        //         "crv": "BP-256"
        //       }
        //     }

        // Use jwt only for getting the current date/time + 3600 seconds.
        Jwt jwt = new Jwt();

        JsonObject jweProtHdr = new JsonObject();
        jweProtHdr.updateString("alg", "ECDH-ES");
        jweProtHdr.updateString("enc", "A256GCM");
        jweProtHdr.updateInt("exp", jwt.genNumericDate(3600));
        jweProtHdr.updateString("cty", "NJWT");
        jweProtHdr.updateString("epk.kty", "EC");
        jweProtHdr.updateString("epk.x", "QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w");
        jweProtHdr.updateString("epk.y", "AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu");
        jweProtHdr.updateString("epk.crv", "BP-256");

        Jwe jwe = new Jwe();
        jwe.setProtectedHeader(jweProtHdr);
        jwe.setPublicKey(0, pubkey);

        String plainText = "This is the text to be encrypted.";
        String strJwe;
        try {
            strJwe = jwe.encrypt(plainText, "utf-8");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println(strJwe);

        System.out.println("Success.");
    }
}