Java

Load ECC Public Key from JWK Format (JSON Web Key)

See more ECC Examples

Demonstrates how to load an ECC public key from JWK (JSON Web Key) format.

Note: This example requires Chilkat v9.5.0.66 or later.

Chilkat2 Java

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

public class ChilkatExample {

    public static void main(String[] args) {
        // Note: This example requires Chilkat v9.5.0.66 or later.

        // First build a JWK sample to load..
        JsonObject json = new JsonObject();
        json.updateString("kty", "EC");
        json.updateString("crv", "P-256");
        json.updateString("x", "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE");
        json.updateString("y", "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU");

        // The JSON contains the following:
        // {
        //   "kty": "EC",
        //   "crv": "P-256",
        //   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
        //   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
        // }

        // Note: The JSON can contain other members, such as "use", "kid", or anything else.  These will be ignored.
        json.setEmitCompact(false);

        // Show the JWK string to be loaded:
        String jwkStr = json.emit();

        PublicKey pubKey = new PublicKey();
        // The LoadFromString method will automatically detect the format.
        try {
            pubKey.loadFromString(jwkStr);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // OK.. the JWK is loaded.  It can be used in whatever way desired...

        // The key can be retrieved in any other format, such as XML or PEM..
        System.out.println(pubKey.getXml());

        // XML output:
        // <ECCPublicKey curve="secp256r1"
        //    x="A01532A3C0900053DE60FBEFEFCCA58793301598D308B41E6F4E364E388C2711"
        //    y="BEF432C599148C94143D4FF46C2CB73E3E6A41D7EEF23C047EA11E60667DE425">
        //    MIIBSzCCAQMGByqGSM49AgEwgfcCAQEwLAYHKoZIzj0BAQIhAP////8AAAABAAAAAAAAAAAAAAAA////////////////MFsEIP////8AAAABAAAAAAAAAAAAAAAA///////////////8BCBaxjXYqjqT57PrvVV2mIa8ZR0GsMxTsPY7zjw+J9JgSwMVAMSdNgiG5wSTamZ44ROdJreBn36QBEEEaxfR8uEsQkf4vOblY6RA8ncDfYEt6zOg9KE5RdiYwpZP40Li/hp/m47n60p8D54WK84zV2sxXs7LtkBoN79R9QIhAP////8AAAAA//////////+85vqtpxeehPO5ysL8YyVRAgEBA0IABKAVMqPAkABT3mD77+/MpYeTMBWY0wi0Hm9ONk44jCcRvvQyxZkUjJQUPU/0bCy3Pj5qQdfu8jwEfqEeYGZ95CU=
        // </ECCPublicKey>

        // Choose PCKS1 or PCKS8 PEM format..
        boolean bPreferPkcs1 = false;
        System.out.println(pubKey.getPem(bPreferPkcs1));

        // PEM output
        // -----BEGIN PUBLIC KEY-----
        // MIIBSzCCAQMGByqGSM49AgEwgfcCAQEwLAYHKoZIzj0BAQIhAP////8AAAABAAAA
        // AAAAAAAAAAAA////////////////MFsEIP////8AAAABAAAAAAAAAAAAAAAA////
        // ///////////8BCBaxjXYqjqT57PrvVV2mIa8ZR0GsMxTsPY7zjw+J9JgSwMVAMSd
        // NgiG5wSTamZ44ROdJreBn36QBEEEaxfR8uEsQkf4vOblY6RA8ncDfYEt6zOg9KE5
        // RdiYwpZP40Li/hp/m47n60p8D54WK84zV2sxXs7LtkBoN79R9QIhAP////8AAAAA
        // //////////+85vqtpxeehPO5ysL8YyVRAgEBA0IABKAVMqPAkABT3mD77+/MpYeT
        // MBWY0wi0Hm9ONk44jCcRvvQyxZkUjJQUPU/0bCy3Pj5qQdfu8jwEfqEeYGZ95CU=
        // -----END PUBLIC KEY-----
    }
}