Node.js

Get ECC Public Key in JWK Format (JSON Web Key)

See more ECC Examples

Demonstrates how to get an ECC public key in JWK (JSON Web Key) format.

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

Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

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

    // Load a PEM file into memory.
    var sbPem = new chilkat.StringBuilder();
    success = sbPem.LoadFile("qa_data/pem/ecc_public.pem","utf-8");
    if (success !== true) {
        console.log("Failed to load PEM file.");
        return;
    }

    // Load the PEM into a public key object.
    var pubKey = new chilkat.PublicKey();
    success = pubKey.LoadFromString(sbPem.GetAsString());
    if (success !== true) {
        console.log(pubKey.LastErrorText);
        return;
    }

    // Get the public key in JWK format:
    var jwk = pubKey.GetJwk();

    // The GetJwk method will return the JWK in the most compact JSON format possible,
    // as a single line with no extra whitespace.  To get a more human-readable JWK (for this example),
    // load into a Chilkat JSON object and emit non-compact:

    var json = new chilkat.JsonObject();
    json.Load(jwk);
    json.EmitCompact = false;
    console.log("ECC Public Key in JWK format:");
    console.log(json.Emit());

    // Sample output:
    // { 
    //   "kty": "EC",
    //   "crv": "P-256",
    //   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
    //   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU"
    // }
    // 
    // Additional information can be added like this:
    json.AppendString("use","enc");
    json.AppendString("kid","123ABC");

    // Now examine the JSON:
    console.log(json.Emit());

    // { 
    //   "kty": "EC",
    //   "crv": "P-256",
    //   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
    //   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
    //   "use": "enc",
    //   "kid": "123ABC"
    // }

}

chilkatExample();