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signer.js
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signer.js
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function exceptionToString(err) {
var vDebug = "";
for (var prop in err) {
vDebug += "property: "+ prop+ " value: ["+ err[prop]+ "]\n";
}
return "toString(): " + " value: [" + err.toString() + "]";
}
function generateNewMiniPrivateKey() {
while (true) {
MyWallet._seed();
//Use a normal ECKey to generate random bytes
var key = new Bitcoin.ECKey(false);
//Make Candidate Mini Key
var minikey = 'S' + Bitcoin.Base58.encode(key.priv).substr(0, 21);
//Append ? & hash it again
var bytes_appended = Crypto.SHA256(minikey + '?', {asBytes: true});
//If zero byte then the key is valid
if (bytes_appended[0] == 0) {
//SHA256
var bytes = Crypto.SHA256(minikey, {asBytes: true});
var eckey = new Bitcoin.ECKey(bytes);
if (MyWallet.addPrivateKey(eckey))
return {key : eckey, miniKey : minikey};
}
}
}
function IsCanonicalSignature(vchSig) {
if (vchSig.length < 9)
throw 'Non-canonical signature: too short';
if (vchSig.length > 73)
throw 'Non-canonical signature: too long';
var nHashType = vchSig[vchSig.length - 1];
if (nHashType != SIGHASH_ALL && nHashType != SIGHASH_NONE && nHashType != SIGHASH_SINGLE && nHashType != SIGHASH_ANYONECANPAY)
throw 'Non-canonical signature: unknown hashtype byte ' + nHashType;
if (vchSig[0] != 0x30)
throw 'Non-canonical signature: wrong type';
if (vchSig[1] != vchSig.length-3)
throw 'Non-canonical signature: wrong length marker';
var nLenR = vchSig[3];
if (5 + nLenR >= vchSig.length)
throw 'Non-canonical signature: S length misplaced';
var nLenS = vchSig[5+nLenR];
if (nLenR+nLenS+7 != vchSig.length)
throw 'Non-canonical signature: R+S length mismatch';
var n = 4;
if (vchSig[n-2] != 0x02)
throw 'Non-canonical signature: R value type mismatch';
if (nLenR == 0)
throw 'Non-canonical signature: R length is zero';
if (vchSig[n+0] & 0x80)
throw 'Non-canonical signature: R value negative';
if (nLenR > 1 && (vchSig[n+0] == 0x00) && !(vchSig[n+1] & 0x80))
throw 'Non-canonical signature: R value excessively padded';
var n = 6+nLenR;
if (vchSig[n-2] != 0x02)
throw 'Non-canonical signature: S value type mismatch';
if (nLenS == 0)
throw 'Non-canonical signature: S length is zero';
if (vchSig[n+0] & 0x80)
throw 'Non-canonical signature: S value negative';
if (nLenS > 1 && (vchSig[n+0] == 0x00) && !(vchSig[n+1] & 0x80))
throw 'Non-canonical signature: S value excessively padded';
return true;
}
try {
//Init WebWorker
//Window is not defined in WebWorker
if (typeof window == "undefined" || !window) {
var window = {};
self.addEventListener('message', function(e) {
var data = e.data;
try {
switch (data.cmd) {
case 'seed':
seed_large_int32_array(Crypto.util.bytesToWords(Crypto.util.hexToBytes(data.seed)));
break;
case 'decrypt':
var decoded = Crypto.AES.decrypt(data.data, data.password, { mode: new Crypto.mode.CBC(Crypto.pad.iso10126), iterations : data.pbkdf2_iterations});
self.postMessage({cmd : 'on_decrypt', data : decoded});
break;
case 'load_resource':
importScripts(data.path);
break;
case 'sign_input':
var tx = new Bitcoin.Transaction(data.tx);
var connected_script = new Bitcoin.Script(data.connected_script);
var signed_script = signInput(tx, data.outputN, data.priv_to_use, connected_script);
if (signed_script) {
self.postMessage({cmd : 'on_sign', script : signed_script, outputN : data.outputN});
} else {
throw 'Unknown Error Signing Script ' + data.outputN;
}
break;
default:
throw 'Unknown Command';
};
} catch (e) {
self.postMessage({cmd : 'on_error', e : exceptionToString(e)});
}
}, false);
}
} catch (e) { }
function showPrivateKeyModal(success, error, addr) {
var modal = $('#private-key-modal');
modal.modal({
keyboard: true,
backdrop: "static",
show: true
});
modal.center();
modal.find('.address').text(addr);
var scanned_key = null;
var compressed = false;
var error_msg = null;
var key_input = modal.find('input[name="key"]');
key_input.val('');
modal.find('.qrcodeicon span').click(function() {
modal.modal('hide');
MyWallet.scanQRCode(function(code) {
console.log('Scanned ' + code);
modal.modal('show');
key_input.val(code);
modal.find('.btn.btn-primary').trigger('click');
}, function(e) {
modal.modal('show');
MyWallet.makeNotice('error', 'misc-error', e);
});
});
modal.find('.btn.btn-primary').unbind().click(function() {
var value = $.trim(key_input.val());
try {
if (value.length == 0) {
throw 'You must enter a private key to import';
}
var format = MyWallet.detectPrivateKeyFormat(value);
console.log('PK Format ' + format);
if (format == 'bip38') {
modal.modal('hide');
loadScript('wallet/import-export', function() {
MyWallet.getPassword($('#import-private-key-password'), function(_password) {
ImportExport.parseBIP38toECKey(value, _password, function(key, isCompPoint) {
scanned_key = key;
compressed = isCompPoint;
modal.modal('hide');
if (scanned_key)
success(scanned_key);
else
error(error_msg);
}, error);
}, error);
}, error);
return;
}
scanned_key = MyWallet.privateKeyStringToKey(value, format);
compressed = (format == 'compsipa');
if (scanned_key == null) {
throw 'Could not decode private key';
}
} catch(e) {
error_msg = 'Error importing private key ' + e;
}
modal.modal('hide');
if (scanned_key)
success(scanned_key);
else
error(error_msg);
});
modal.find('.btn.btn-secondary').unbind().click(function() {
modal.modal('hide');
error('User Cancelled');
});
}
function resolveAddress(label) {
label = $.trim(label);
try {
return new Bitcoin.Address(label).toString();
} catch (e) {}
label = label.toLowerCase();
var address_book = MyWallet.getAddressBook();
for (var key in address_book) {
var a_label = MyWallet.getAddressBookLabel(key);
if (a_label.toLowerCase() == label) {
return $.trim(key);
}
}
var addresses = MyWallet.getAllAddresses();
for (var i = 0; i < addresses.length; ++i) {
var key = addresses[i];
var a_label = MyWallet.getAddressLabel(key);
if (a_label && a_label.toLowerCase() == label)
return key;
}
return null;
}
//Check for inputs and get unspent for before signing
function startTxUI(el, type, pending_transaction, dont_ask_for_anon) {
function resetForm() {
el.find('input[name="send-value"]').val('');
el.find('input[name="send-to-address"]').val('');
}
try {
el.find('input,select,button').prop('disabled', true);
pending_transaction.addListener({
on_success : function(e) {
el.find('input,select,button').prop('disabled', false);
},
on_start : function(e) {
el.find('input,select,button').prop('disabled', true);
},
on_error : function(e) {
el.find('input,select,button').prop('disabled', false);
}
});
var total_value = 0;
el.find('input[name="send-value"]').each(function() {
total_value += parseFloat($(this).val());
});
var custom_ask_for_fee = true;
if (total_value > precisionFromBTC(10)) {
if (type == 'email' || type == 'sms') {
throw 'Cannot Send More Than 10 BTC via email or sms';
} else if (type == 'quick') { //Any quick transactions over 10 BTC make them custom
type = 'custom';
custom_ask_for_fee = false;
}
} else if (type == 'shared' && total_value < precisionFromBTC(0.1)) {
throw 'The Minimum Amount You Can Send Shared is ' + formatPrecision(precisionFromBTC(0.1));
} else if (type == 'shared' && total_value > precisionFromBTC(250)) {
throw 'The Maximum Amount You Can Send Shared is ' + formatPrecision(precisionFromBTC(250));
}
if (type == 'custom' || type == 'shared') {
var listener = {
on_error : function(e) {
if (this.modal)
this.modal.modal('hide');
},
on_success : function() {
resetForm();
},
on_start : function() {
//Show the modal on start
var self = this;
//Create the modal
this.modal = $('#new-transaction-modal');
this.modal.modal({
keyboard: false,
backdrop: "static",
show: true
});
this.modal.find('.offline-transaction').hide();
this.modal.find('#missing-private-key').hide();
this.modal.find('#review-tx').hide();
this.modal.find('.modal-header h3').html('Creating transaction');
this.modal.find('#tx-sign-progress').hide();
//disable primary for now
this.modal.find('.btn.btn-primary').prop('disabled', true);
this.modal.find('.btn.btn-primary').text('Send Transaction');
this.modal.find('.btn.btn-secondary').unbind().click(function() {
if (self.modal)
self.modal.modal('hide');
self.cancel();
});
},
on_begin_signing : function() {
$('#tx-sign-progress').show().find('.t').text(this.tx.ins.length);
},
on_sign_progress : function(i) {
$('#tx-sign-progress').find('.n').text(i);
},
on_finish_signing : function() {
$('#tx-sign-progress').hide();
}
};
pending_transaction.addListener(listener);
if (custom_ask_for_fee) {
pending_transaction.ask_for_fee = function(yes, no) {
var self = this;
if (self.modal)
self.modal.modal('hide'); //Hide the transaction progress modal
var modal = $('#ask-for-fee');
modal.modal({
keyboard: false,
backdrop: "static",
show: true
});
modal.find('.btn.btn-primary').unbind().click(function() {
modal.modal('hide');
yes();
});
modal.find('.btn.btn-secondary').unbind().click(function() {
modal.modal('hide');
no();
});
modal.unbind().on('hidden', function () {
if (self.modal)
self.modal.modal('show'); //Show the progress modal again
});
};
pending_transaction.ask_to_increase_fee = function(yes, no, customFee, recommendedFee) {
var self = this;
if (self.modal)
self.modal.modal('hide'); //Hide the transaction progress modal
var modal = $('#ask-to-increase-fee');
modal.modal({
keyboard: false,
backdrop: "static",
show: true
});
var modal_body = modal.find('.modal-body');
var spans = modal_body.find('span');
spans.eq(0).text(formatSymbol(customFee.intValue(), symbol_btc));
spans.eq(1).text(formatSymbol(recommendedFee.intValue(), symbol_btc));
modal.find('.btn.btn-primary').unbind().click(function() {
modal.modal('hide');
yes();
});
modal.find('.btn.btn-secondary').unbind().click(function() {
modal.modal('hide');
no();
});
modal.unbind().on('hidden', function () {
if (self.modal)
self.modal.modal('show'); //Show the progress modal again
});
};
}
pending_transaction.ask_to_send = function() {
var self = this;
try {
self.modal.find('.modal-header h3').html(self.ready_to_send_header);
self.modal.find('#missing-private-key').hide();
self.modal.find('#review-tx').show();
setReviewTransactionContent(self.modal, self.tx, self.type);
setAdv(false);
self.modal.center();
//We have the transaction ready to send, check if were online or offline
var btn = self.modal.find('.btn.btn-primary');
MyWallet.setLoadingText('Checking Connectivity');
$.ajax({
timeout: 60000,
type: "GET",
url: root + 'ping',
data : {format : 'plain', date : new Date().getTime()},
success: function() {
btn.removeAttr('disabled');
btn.text('Send Transaction');
btn.unbind().click(function() {
btn.prop('disabled', true);
if (self.modal)
self.modal.modal('hide');
self.send();
});
},
error : function() {
self.modal.find('.modal-header h3').html('Created Offline Transaction.');
btn.removeAttr('disabled');
btn.text('Show Offline Instructions');
btn.unbind().click(function() {
btn.prop('disabled', true);
self.modal.find('#missing-private-key').hide();
self.modal.find('#review-tx').hide();
self.modal.find('.offline-transaction').show();
var s = self.tx.serialize();
var hex = Crypto.util.bytesToHex(s);
self.modal.find('.offline-transaction textarea[name="data"]').val(hex);
});
self.modal.center();
}
});
} catch (e) {
self.error(e);
}
};
} else if (type == 'quick' || type == 'email' || type == 'dice' || type == 'sms') {
var listener = {
on_error : function(e) {
el.find('.send').show();
if (this.p)
this.p.hide();
},
on_success : function() {
try {
el.find('.send').show();
if (type != 'dice') {
resetForm();
}
if (this.p)
this.p.hide();
} catch (e) {
console.log(e);
}
},
on_start : function() {
this.p = el.find('.progress');
el.find('.send').hide();
this.p.show();
this.p.children().css('width', '10%');
},
on_begin_signing : function() {
this.p.children().css('width', '25%');
},
on_sign_progress : function(i) {
this.p.children().css('width', 25 + ((100 / this.tx.ins.length) * i) + '%');
},
on_finish_signing : function() {
this.p.children().css('width', '100%');
}
};
pending_transaction.addListener(listener);
if (type == 'sms') {
pending_transaction.ask_to_send = function() {
try {
var self = this;
MyWallet.securePost('send-via', {
type : 'sms',
to : self.sms_data.number,
priv : self.sms_data.miniKey,
hash : Crypto.util.bytesToHex(self.tx.getHash().reverse())
}, function() {
self.send();
}, function(data) {
self.error(data ? data.responseText : null);
});
} catch (e) {
self.error(e);
}
};
} else if (type == 'email') {
pending_transaction.ask_to_send = function() {
var self = this;
var modal = $('#send-email-modal');
try {
MyWallet.securePost("wallet", { method : 'get-info', format : 'json' }, function(data) {
try {
modal.modal({
keyboard: true,
backdrop: "static",
show: true
});
var from_name = data.alias;
if (from_name == null)
from_name = data.email
if (from_name == null)
from_name = 'Shared'
modal.find('.amount').text(formatBTC(self.email_data.amount.toString()));
modal.find('.email').text(self.email_data.email);
modal.find('.frame').html('<iframe frameBorder="0" style="box-sizing:border-box;width:100%;height:100%" src="'+root+'email-template?from_name='+from_name+'&amount='+self.email_data.amount+'&priv=Preview&type=send-bitcoins-get"></iframe>');
modal.find('.btn.btn-secondary').unbind().click(function() {
self.cancel();
modal.modal('hide');
});
modal.find('.btn.btn-primary').unbind().click(function() {
modal.modal('hide');
try {
MyWallet.securePost('send-via', {
type : 'email',
to : self.email_data.email,
priv : self.email_data.priv,
hash : Crypto.util.bytesToHex(self.tx.getHash().reverse())
}, function(data) {
self.send();
}, function(data) {
self.error(data ? data.responseText : null);
});
} catch (e) {
self.error(e);
}
});
} catch (e) {
modal.modal('hide');
self.error(e);
}
}, function(e) {
modal.modal('hide');
self.error('Error Getting Account Data');
});
} catch (e) {
modal.modal('hide');
self.error(e);
}
};
}
}
//Modal for when private key is missing (Watch Only)
pending_transaction.insufficient_funds = function(amount_required, amount_available, yes, no) {
var self = this;
if (self.modal)
self.modal.modal('hide'); //Hide the transaction progress modal
var modal = $('#insufficient-funds');
modal.find('.amount-required').text(formatBTC(amount_required));
modal.find('.amount-available').text(formatBTC(amount_available));
modal.modal({
keyboard: false,
backdrop: "static",
show: true
});
modal.find('.btn.btn-primary').unbind().click(function() {
modal.modal('hide');
yes();
});
modal.find('.btn.btn-secondary').unbind().click(function() {
modal.modal('hide');
no();
});
modal.unbind().on('hidden', function () {
if (self.modal)
self.modal.modal('show'); //Show the progress modal again
});
};
//Modal for when private key is missing (Watch Only)
pending_transaction.ask_for_private_key = function(success, error, addr) {
var self = this;
if (self.modal)
self.modal.modal('hide'); //Hide the transaction progress modal
showPrivateKeyModal(function(key, compressed) {
if (self.modal)
self.modal.modal('show'); //Show the progress modal again
success(key, compressed);
}, function (e) {
if (self.modal)
self.modal.modal('show'); //Show the progress modal again
error(e);
}, addr)
};
pending_transaction.type = type;
//Default is 0.0001 Base Fee, No fee
if (MyWallet.getFeePolicy() == 1) {
pending_transaction.base_fee = BigInteger.valueOf(100000); //0.001 BTC
pending_transaction.fee = BigInteger.valueOf(100000); //0.001 BTC
} else if (MyWallet.getFeePolicy() == -1) {
pending_transaction.base_fee = BigInteger.valueOf(10000); //0.0001 BTC
pending_transaction.ask_for_fee = function(yes, no) {
no();
};
}
(function(pending_transaction) {
MyWallet.getSecondPassword(function() {
try {
//Get the from address, if any
var from_select = el.find('select[name="from"]');
var fromval = from_select.val();
if (fromval == null || fromval == 'any') {
pending_transaction.from_addresses = MyWallet.getActiveAddresses();
} else if (from_select.attr('multiple') == 'multiple') {
pending_transaction.from_addresses = fromval;
} else {
pending_transaction.from_addresses = [fromval];
}
var note = el.find('textarea[name="public-note"]').val();
if (note != null && note.length > 0) {
if (note.length > 255)
throw 'Notes are restricted to 255 characters in length';
pending_transaction.note = note;
}
var changeAddressVal = $.trim(el.find('select[name="change"]').val());
if (changeAddressVal.length > 0) {
if (changeAddressVal == 'new') {
var obj = MyWallet.generateNewKey();
if (!obj || !obj.addr)
throw 'Error Generating New Address';
var bitcoin_address = obj.addr;
pending_transaction.change_address = new Bitcoin.Address(bitcoin_address);
pending_transaction.generated_addresses.push(bitcoin_address);
} else if (changeAddressVal != 'any') {
try {
pending_transaction.change_address = new Bitcoin.Address(changeAddressVal);
} catch (e) {
throw 'Invalid change address: ' + e;
};
}
}
var input_fee_string = el.find('input[name="fees"]').val();
if (input_fee_string != null && input_fee_string.length > 0) {
var input_fee = precisionToSatoshiBN(input_fee_string);
if (input_fee.compareTo(BigInteger.ZERO) >= 0) {
pending_transaction.fee = input_fee;
pending_transaction.did_specify_fee_manually = true;
}
}
var recipients = el.find(".recipient");
if (recipients.length == 0) {
throw 'A transaction must have at least one recipient';
}
var n_recipients = recipients.length;
var try_continue = function() {
if (n_recipients == 0) {
pending_transaction.error('Nothing to send.');
return;
}
//Check that we have resolved all to addresses
if (pending_transaction.to_addresses.length < n_recipients)
return;
//Check that we have resolved all to addresses
if (pending_transaction.to_addresses.length > n_recipients) {
pending_transaction.error('We seem to have more recipients than required. Unknown error');
return;
}
//If we do have the correct number of recipients start the transaction
pending_transaction.start();
}
//Constuct the recepient address array
recipients.each(function() {
try {
var child = $(this);
/* Parse The Value */
var value_input = child.find('input[name="send-value"]');
var send_to_input = child.find('input[name="send-to-address"]');
var send_to_email_input = child.find('input[name="send-to-email"]');
var send_to_sms_input = child.find('input[name="send-to-sms"]');
var value = 0;
try {
value = precisionToSatoshiBN(value_input.val());
if (value == null || value.compareTo(BigInteger.ZERO) <= 0)
throw 'You must enter a value greater than zero';
} catch (e) {
console.log(e);
if (value_input.data('optional') == true) {
--n_recipients;
return true;
} else {
throw 'Invalid send amount';
}
};
if (send_to_input.length > 0) {
//Trim and remove non-printable characters
var send_to_address = $.trim(send_to_input.val()).replace(/[\u200B-\u200D\uFEFF]/g, '');
if (send_to_address == null || send_to_address.length == 0) {
throw 'You must enter a bitcoin address for each recipient';
} else {
var address = resolveAddress(send_to_address);
if (type == 'shared') {
if (!address) {
throw 'Invalid Bitcoin Address';
}
MyWallet.setLoadingText('Creating Forwarding Address');
MyWallet.securePost("forwarder", { action : "create-mix", address : address, shared : true, format : 'json'}, function(obj) {
try {
if (obj.destination != address) {
throw 'Mismatch between requested and returned destination address';
}
if (obj.fee_percent != MyWallet.getMixerFee()) {
MyWallet.get_history();
throw 'The mixer fee may have changed';
}
pending_transaction.to_addresses.push({address: new Bitcoin.Address(obj.input_address), value : value});
//Call again now we have got the forwarding address
try_continue();
} catch (e) {
pending_transaction.error(e);
}
}, function(data) {
pending_transaction.error(data ? data.responseText : null);
});
} else {
if (address) {
pending_transaction.to_addresses.push({address: new Bitcoin.Address(address), value : value});
} else if (send_to_address.length < 10) {
//Try and Resolve firstbits
BlockchainAPI.resolve_firstbits(send_to_address, function(data) {
try {
pending_transaction.to_addresses.push({address: new Bitcoin.Address(data), value : value});
//Call again now we have resolved the address
try_continue();
} catch (e) {
pending_transaction.error(e);
}
}, function() {
pending_transaction.error('Invalid to address: ' + send_to_address);
});
return false;
} else {
pending_transaction.error('Invalid to address: ' + send_to_address);
}
}
}
} else if (send_to_sms_input.length > 0) {
var mobile_number = $.trim(send_to_sms_input.val());
if (mobile_number.charAt(0) == '0')
mobile_number = mobile_number.substring(1);
if (mobile_number.charAt(0) != '+')
mobile_number = '+' + child.find('select[name="sms-country-code"]').val() + mobile_number;
//Send to email address
var miniKeyAddrobj = generateNewMiniPrivateKey();
//Fetch the newly generated address
var address = miniKeyAddrobj.key.getBitcoinAddress().toString();
//Archive the address
MyWallet.setAddressTag(address, 2);
MyWallet.setAddressLabel(address, mobile_number + ' Sent Via SMS');
pending_transaction.generated_addresses.push(address);
pending_transaction.to_addresses.push({address: new Bitcoin.Address(address), value : value});
if (pending_transaction.sms_data)
throw 'Cannot send to more than one SMS recipient at a time';
pending_transaction.sms_data = {
number : mobile_number,
miniKey: miniKeyAddrobj.miniKey
};
} else if (send_to_email_input.length > 0) {
//Send to email address
var send_to_email = $.trim(send_to_email_input.val());
function validateEmail(str) {
var lastAtPos = str.lastIndexOf('@');
var lastDotPos = str.lastIndexOf('.');
return (lastAtPos < lastDotPos && lastAtPos > 0 && str.indexOf('@@') == -1 && lastDotPos > 2 && (str.length - lastDotPos) > 2);
}
if (validateEmail(send_to_email)) {
//Send to email address
var obj = MyWallet.generateNewKey();
if (!obj || !obj.addr)
throw 'Error Generating New Address';
//Fetch the newly generated address
var address = obj.addr;
//Archive the address
MyWallet.setAddressTag(address, 2);
MyWallet.setAddressLabel(address, send_to_email + ' Sent Via Email');
pending_transaction.generated_addresses.push(address);
pending_transaction.to_addresses.push({address: new Bitcoin.Address(address), value : value});
if (pending_transaction.email_data)
throw 'Cannot send to more than one email recipient at a time';
pending_transaction.email_data = {
email : send_to_email,
priv : B58.encode(obj.key.priv),
amount : value
}
} else {
throw 'Invalid Email Address';
}
}
} catch (e) {
console.log(e);
pending_transaction.error(e);
}
});
try_continue();
} catch (e) {
pending_transaction.error(e);
}
}, function() {
pending_transaction.error();
});
})(pending_transaction);
} catch (e) {
pending_transaction.error(e);
}
return pending_transaction;
};
function signInput(tx, inputN, base58Key, connected_script, type) {
type = type ? type : SIGHASH_ALL;
var pubKeyHash = connected_script.simpleOutPubKeyHash();
var inputBitcoinAddress = new Bitcoin.Address(pubKeyHash).toString();
var key = new Bitcoin.ECKey(base58Key);
var compressed;
if (key.getBitcoinAddress().toString() == inputBitcoinAddress.toString()) {
compressed = false;
} else if (key.getBitcoinAddressCompressed().toString() == inputBitcoinAddress.toString()) {
compressed = true;
} else {
throw 'Private key does not match bitcoin address ' + inputBitcoinAddress.toString() + ' = ' + key.getBitcoinAddress().toString() + ' | '+ key.getBitcoinAddressCompressed().toString();
}
var hash = tx.hashTransactionForSignature(connected_script, inputN, type);
var rs = key.sign(hash);
var signature = Bitcoin.ECDSA.serializeSig(rs.r, rs.s);
// Append hash type
signature.push(type);
if (!IsCanonicalSignature(signature)) {
throw 'IsCanonicalSignature returned false';
}
var script;