Swift

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.

Swift

func chilkatTest() {
    var success: Bool = false

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

    // Load a PEM file into memory.
    let sbPem = CkoStringBuilder()!
    success = sbPem.loadFile(path: "qa_data/pem/ecc_public.pem", charset: "utf-8")
    if success != true {
        print("Failed to load PEM file.")
        return
    }

    // Load the PEM into a public key object.
    let pubKey = CkoPublicKey()!
    success = pubKey.load(fromString: sbPem.getAsString())
    if success != true {
        print("\(pubKey.lastErrorText!)")
        return
    }

    // Get the public key in JWK format:
    var jwk: String? = 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:

    let json = CkoJsonObject()!
    json.load(json: jwk)
    json.emitCompact = false
    print("ECC Public Key in JWK format:")
    print("\(json.emit()!)")

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

    // Now examine the JSON:
    print("\(json.emit()!)")

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

}