(Swift 2) Get ECC Public Key in JWK Format (JSON Web Key)

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.

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func chilkatTest() {
    // Note: This example requires Chilkat v9.5.0.66 or later.

    // Load a PEM file into memory.
    let sbPem = CkoStringBuilder()
    var success: Bool = sbPem.LoadFile("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.LoadFromString(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(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("use", value: "enc")
    json.AppendString("kid", value: "123ABC")

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

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

}