return;
	}

	for (idx = 0; idx < message.certificates.length; idx++) {
		certificates.push(
			{
				certificate: message.certificates[idx],
				supportedHashes: ['SHA1', 'SHA256', 'SHA512', 'MD5_SHA1']
			}
		);
	}

	chromeCallback(certificates,
		function(rejectedCerts) {
			if (chrome.runtime.lastError) {

 * Handler for messages from Chrome related to signing a hash of some sort
 */
function cackeySignMessage(signRequest, chromeCallback) {
	var callbackId;
	var command;
	var certificateId;
	var digest, digestHeader;
	var promiseHandle = null, promiseResolve, promiseReject;

	if (!chromeCallback) {
		/*
		 * If no callback supplied, arrange for a promise to be returned instead
		 */
		promiseHandle = new Promise(function(resolve, reject) {
			promiseResolve = resolve;
			promiseReject = reject;
		});

		chromeCallback = function(payload) {
			if (!payload) {
				promiseReject(new Error("Signing payload is empty or not supplied"));
			} else {
				promiseResolve(payload);
			}
		};
	}

	/*
	 * Prefix the digest with the ASN.1 header required of it
	 */
	switch (signRequest.hash) {
		case "SHA1":
			digestHeader = new Uint8Array([0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x0e, 0x03, 0x02, 0x1a, 0x05, 0x00, 0x04, 0x14]);
			break;
		case "SHA256":
			digestHeader = new Uint8Array([0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05, 0x00, 0x04, 0x20]);
			break;
		case "SHA512":
			digestHeader = new Uint8Array([0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03, 0x05, 0x00, 0x04, 0x40]);
			break;
		case "MD5_SHA1":
		case "RAW":
			digestHeader = new Uint8Array();
			break;
		default:
			console.error("[cackey] Asked to sign a message with a hash we do not support: " + signRequest.hash);

			chromeCallback();

			return(promiseHandle);
	}

	digest = new Uint8Array(digestHeader.length + signRequest.digest.byteLength);
	digest.set(digestHeader, 0);
	digest.set(new Uint8Array(signRequest.digest), digestHeader.length);

	delete digestHeader;

		cackeyOutstandingCallbacks[callbackId] = chromeCallback;

		if (goog.DEBUG) {
			console.log("[cackey] Thrown.");
		}
	}, chromeCallback);

	return(promiseHandle);
}

/*
 * Unititalizes the CACKey PCSC connection
 */
function cackeyUninitPCSC() {
	console.log("[cackey] cackeyUninitPCSC() called");