(Swift 3,4,5...) Get ECC Private Key in JWK Format (JSON Web Key)

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.

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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_privKey.pem", charset: "utf-8")
    if success != true {
        print("Failed to load PEM file.")
        return
    }

    // Load the PEM into a private key object.
    let privKey = CkoPrivateKey()!
    success = privKey.loadPem(sbPem.getAsString())
    if success != true {
        print("\(privKey.lastErrorText!)")
        return
    }

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

    let json = CkoJsonObject()!
    json.load(jwk)
    json.emitCompact = false
    print("ECC Private Key in JWK format:")
    print("\(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.append("use", value: "enc")
    json.append("kid", value: "123ABC")

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

    // { 
    //   "kty": "EC",
    //   "crv": "P-256",
    //   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
    //   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
    //   "d": "EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM",
    //   "use": "enc",
    //   "kid": "123ABC"
    // }

}