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ultraviolet
GitHub Repository: ultraviolet/bitaddress.org
 Path: blob/master/src/ninja.splitwallet.js
248 views
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ninja.wallets.splitwallet = {

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    isOpen: function () {

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        return (document.getElementById("splitwallet").className.indexOf("selected") != -1);

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    },

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	open: function () {

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		document.getElementById("splitarea").style.display = "block";

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		secrets.setRNG();

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		secrets.init(7); // 7 bits allows for up to 127 shares

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	},

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	close: function () {

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		document.getElementById("splitarea").style.display = "none";

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	},

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	mkOutputRow: function (s, id, lbltxt) {

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		var row = document.createElement("div");

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		var label = document.createElement("label");

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		label.innerHTML = lbltxt;

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		var qr = document.createElement("div");

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		var output = document.createElement("span");

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		output.setAttribute("class", "output");

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		output.innerHTML = s;

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		qr.setAttribute("id", id);

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		row.setAttribute("class", "splitsharerow");

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		row.appendChild(label);

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		row.appendChild(output);

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		row.appendChild(qr);

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		row.appendChild(document.createElement("br"));

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		return row;

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	},

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	stripLeadZeros: function (hex) { return hex.split(/^0+/).slice(-1)[0]; },

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	hexToBytes: function (hex) {

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		//if input has odd number of digits, pad it

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		if (hex.length % 2 == 1)

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			hex = "0" + hex;

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		for (var bytes = [], c = 0; c < hex.length; c += 2)

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			bytes.push(parseInt(hex.substr(c, 2), 16));

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		return bytes;

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	},

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	// Split a private key and update information in the HTML

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	splitKey: function () {

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		try {

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			var numshares = parseInt(document.getElementById('splitshares').value);

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			var threshold = parseInt(document.getElementById('splitthreshold').value);

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			var key = new Bitcoin.ECKey(false);

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			var bitcoinAddress = key.getBitcoinAddress();

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			var shares = ninja.wallets.splitwallet.getFormattedShares(key.getBitcoinHexFormat(), numshares, threshold);

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			var output = document.createElement("div");

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			output.setAttribute("id", "splitoutput");

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			var m = {};

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			output.appendChild(this.mkOutputRow(bitcoinAddress, "split_addr", "Bitcoin Address:    "));

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			m["split_addr"] = bitcoinAddress;

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			for (var i = 0; i < shares.length; i++) {

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				var id = "split_qr_" + i;

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				output.appendChild(this.mkOutputRow(shares[i], id, "Share " + (i + 1) + ":          "));

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				m[id] = shares[i];

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			}

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			document.getElementById("splitstep1area").innerHTML = output.innerHTML;

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			ninja.qrCode.showQrCode(m);

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			document.getElementById("splitstep1area").style.display = "block";

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			document.getElementById("splitstep1icon").setAttribute("class", "less");

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		}

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		catch (e) {

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			// browser does not have sufficient JavaScript support to generate a bitcoin address

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			alert(e);

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		}

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	},

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	// Combine shares of a private key to retrieve the key

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	combineShares: function () {

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		try {

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			document.getElementById("combinedprivatekey").innerHTML = "";

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			var shares = document.getElementById("combineinput").value.trim().split(/\W+/);

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			var combinedBytes = ninja.wallets.splitwallet.combineFormattedShares(shares);

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			var privkeyBase58 = new Bitcoin.ECKey(combinedBytes).getBitcoinWalletImportFormat();

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			document.getElementById("combinedprivatekey").innerHTML = privkeyBase58;

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		}

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		catch (e) {

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			alert(e);

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		}

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	},

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	// generate shares and format them in base58

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	getFormattedShares: function (key, numshares, threshold) {

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		var shares = secrets.share(key, numshares, threshold).map(ninja.wallets.splitwallet.hexToBytes).map(Bitcoin.Base58.encode);

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		return shares;

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	},

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	// combine base58 formatted shares and return a bitcoin byte array

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	combineFormattedShares: function (shares) {

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		var combined = secrets.combine(shares.map(Bitcoin.Base58.decode).map(Crypto.util.bytesToHex).map(ninja.wallets.splitwallet.stripLeadZeros));

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		return ninja.wallets.splitwallet.hexToBytes(combined);

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	},

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	openCloseStep: function (num) {

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		// do close

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		if (document.getElementById("splitstep" + num + "area").style.display == "block") {

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			document.getElementById("splitstep" + num + "area").style.display = "none";

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			document.getElementById("splitstep" + num + "icon").setAttribute("class", "more");

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		}

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		// do open

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		else {

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			document.getElementById("splitstep" + num + "area").style.display = "block";

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			document.getElementById("splitstep" + num + "icon").setAttribute("class", "less");

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		}

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	}

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};

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