JavaScript

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

See more ECC Examples

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

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

JavaScript

var success = false;

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

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

// Load the PEM into a private key object.
var privKey = new CkPrivateKey();
success = privKey.LoadPem(sbPem.GetAsString());
if (success !== true) {
    console.log(privKey.LastErrorText);
    return;
}

// Get the private key in JWK format:
var jwk = privKey.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 CkJsonObject();
json.Load(jwk);
json.EmitCompact = false;
console.log("ECC Private Key in JWK format:");
console.log(json.Emit());

// Sample output:
// { 
//   "kty": "EC",
//   "crv": "P-256",
//   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
//   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
//   "d": "EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM"
// }
// 

// 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",
//   "d": "EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM",
//   "use": "enc",
//   "kid": "123ABC"
// }