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coin.js
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/*
Coinjs 0.01 beta by OutCast3k{at}gmail.com
A bitcoin framework.
http://github.com/OutCast3k/coinjs or http://coinb.in/coinjs
*/
(function () {
var coinjs = window.coinjs = function () { };
/* public vars */
coinjs.pub = 0x00;
coinjs.priv = 0x80;
coinjs.multisig = 0x05;
coinjs.hdkey = {'prv':0x0488ade4, 'pub':0x0488b21e};
coinjs.bech32 = {'charset':'qpzry9x8gf2tvdw0s3jn54khce6mua7l', 'version':0, 'hrp':'bc'};
coinjs.compressed = false;
/* other vars */
coinjs.developer = '33tht1bKDgZVxb39MnZsWa8oxHXHvUYE4G'; //bitcoin
/* bit(coinb.in) api vars */
coinjs.hostname = ((document.location.hostname.split(".")[(document.location.hostname.split(".")).length-1]) == 'onion') ? '4zpinp6gdkjfplhk.onion' : 'coinb.in';
coinjs.host = ('https:'==document.location.protocol?'https://':'http://')+coinjs.hostname+'/api/';
coinjs.uid = '1';
coinjs.key = '12345678901234567890123456789012';
/* start of address functions */
/* generate a private and public keypair, with address and WIF address */
coinjs.newKeys = function(input){
var privkey = (input) ? Crypto.SHA256(input) : this.newPrivkey();
var pubkey = this.newPubkey(privkey);
return {
'privkey': privkey,
'pubkey': pubkey,
'address': this.pubkey2address(pubkey),
'wif': this.privkey2wif(privkey),
'compressed': this.compressed
};
}
/* generate a new random private key */
coinjs.newPrivkey = function(){
var x = window.location;
x += (window.screen.height * window.screen.width * window.screen.colorDepth);
x += coinjs.random(64);
x += (window.screen.availHeight * window.screen.availWidth * window.screen.pixelDepth);
x += navigator.language;
x += window.history.length;
x += coinjs.random(64);
x += navigator.userAgent;
x += 'coinb.in';
x += (Crypto.util.randomBytes(64)).join("");
x += x.length;
var dateObj = new Date();
x += dateObj.getTimezoneOffset();
x += coinjs.random(64);
x += (document.getElementById("entropybucket")) ? document.getElementById("entropybucket").innerHTML : '';
x += x+''+x;
var r = x;
for(i=0;i<(x).length/25;i++){
r = Crypto.SHA256(r.concat(x));
}
var checkrBigInt = new BigInteger(r);
var orderBigInt = new BigInteger("fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141");
while (checkrBigInt.compareTo(orderBigInt) >= 0 || checkrBigInt.equals(BigInteger.ZERO) || checkrBigInt.equals(BigInteger.ONE)) {
r = Crypto.SHA256(r.concat(x));
checkrBigInt = new BigInteger(r);
}
return r;
}
/* generate a public key from a private key */
coinjs.newPubkey = function(hash){
var privateKeyBigInt = BigInteger.fromByteArrayUnsigned(Crypto.util.hexToBytes(hash));
var curve = EllipticCurve.getSECCurveByName("secp256k1");
var curvePt = curve.getG().multiply(privateKeyBigInt);
var x = curvePt.getX().toBigInteger();
var y = curvePt.getY().toBigInteger();
var publicKeyBytes = EllipticCurve.integerToBytes(x, 32);
publicKeyBytes = publicKeyBytes.concat(EllipticCurve.integerToBytes(y,32));
publicKeyBytes.unshift(0x04);
if(coinjs.compressed==true){
var publicKeyBytesCompressed = EllipticCurve.integerToBytes(x,32)
if (y.isEven()){
publicKeyBytesCompressed.unshift(0x02)
} else {
publicKeyBytesCompressed.unshift(0x03)
}
return Crypto.util.bytesToHex(publicKeyBytesCompressed);
} else {
return Crypto.util.bytesToHex(publicKeyBytes);
}
}
/* provide a public key and return address */
coinjs.pubkey2address = function(h, byte){
var r = ripemd160(Crypto.SHA256(Crypto.util.hexToBytes(h), {asBytes: true}));
r.unshift(byte || coinjs.pub);
var hash = Crypto.SHA256(Crypto.SHA256(r, {asBytes: true}), {asBytes: true});
var checksum = hash.slice(0, 4);
return coinjs.base58encode(r.concat(checksum));
}
/* provide a scripthash and return address */
coinjs.scripthash2address = function(h){
var x = Crypto.util.hexToBytes(h);
x.unshift(coinjs.pub);
var r = x;
r = Crypto.SHA256(Crypto.SHA256(r,{asBytes: true}),{asBytes: true});
var checksum = r.slice(0,4);
return coinjs.base58encode(x.concat(checksum));
}
/* new multisig address, provide the pubkeys AND required signatures to release the funds */
coinjs.pubkeys2MultisigAddress = function(pubkeys, required) {
var s = coinjs.script();
s.writeOp(81 + (required*1) - 1); //OP_1
for (var i = 0; i < pubkeys.length; ++i) {
s.writeBytes(Crypto.util.hexToBytes(pubkeys[i]));
}
s.writeOp(81 + pubkeys.length - 1); //OP_1
s.writeOp(174); //OP_CHECKMULTISIG
var x = ripemd160(Crypto.SHA256(s.buffer, {asBytes: true}), {asBytes: true});
x.unshift(coinjs.multisig);
var r = x;
r = Crypto.SHA256(Crypto.SHA256(r, {asBytes: true}), {asBytes: true});
var checksum = r.slice(0,4);
var redeemScript = Crypto.util.bytesToHex(s.buffer);
var address = coinjs.base58encode(x.concat(checksum));
if(s.buffer.length > 520){ // too large
address = 'invalid';
redeemScript = 'invalid';
}
return {'address':address, 'redeemScript':redeemScript, 'size': s.buffer.length};
}
/* new time locked address, provide the pubkey and time necessary to unlock the funds.
when time is greater than 500000000, it should be a unix timestamp (seconds since epoch),
otherwise it should be the block height required before this transaction can be released.
may throw a string on failure!
*/
coinjs.simpleHodlAddress = function(pubkey, checklocktimeverify) {
if(checklocktimeverify < 0) {
throw "Parameter for OP_CHECKLOCKTIMEVERIFY is negative.";
}
var s = coinjs.script();
if (checklocktimeverify <= 16 && checklocktimeverify >= 1) {
s.writeOp(0x50 + checklocktimeverify);//OP_1 to OP_16 for minimal encoding
} else {
s.writeBytes(coinjs.numToScriptNumBytes(checklocktimeverify));
}
s.writeOp(177);//OP_CHECKLOCKTIMEVERIFY
s.writeOp(117);//OP_DROP
s.writeBytes(Crypto.util.hexToBytes(pubkey));
s.writeOp(172);//OP_CHECKSIG
var x = ripemd160(Crypto.SHA256(s.buffer, {asBytes: true}), {asBytes: true});
x.unshift(coinjs.multisig);
var r = x;
r = Crypto.SHA256(Crypto.SHA256(r, {asBytes: true}), {asBytes: true});
var checksum = r.slice(0,4);
var redeemScript = Crypto.util.bytesToHex(s.buffer);
var address = coinjs.base58encode(x.concat(checksum));
return {'address':address, 'redeemScript':redeemScript};
}
/* create a new segwit address */
coinjs.segwitAddress = function(pubkey){
var keyhash = [0x00,0x14].concat(ripemd160(Crypto.SHA256(Crypto.util.hexToBytes(pubkey), {asBytes: true}), {asBytes: true}));
var x = ripemd160(Crypto.SHA256(keyhash, {asBytes: true}), {asBytes: true});
x.unshift(coinjs.multisig);
var r = x;
r = Crypto.SHA256(Crypto.SHA256(r, {asBytes: true}), {asBytes: true});
var checksum = r.slice(0,4);
var address = coinjs.base58encode(x.concat(checksum));
return {'address':address, 'type':'segwit', 'redeemscript':Crypto.util.bytesToHex(keyhash)};
}
/* create a new segwit bech32 encoded address */
coinjs.bech32Address = function(pubkey){
var program = ripemd160(Crypto.SHA256(Crypto.util.hexToBytes(pubkey), {asBytes: true}), {asBytes: true});
var address = coinjs.bech32_encode(coinjs.bech32.hrp, [coinjs.bech32.version].concat(coinjs.bech32_convert(program, 8, 5, true)));
return {'address':address, 'type':'bech32', 'redeemscript':Crypto.util.bytesToHex(program)};
}
/* extract the redeemscript from a bech32 address */
coinjs.bech32redeemscript = function(address){
var r = false;
var decode = coinjs.bech32_decode(address);
if(decode){
decode.data.shift();
return Crypto.util.bytesToHex(coinjs.bech32_convert(decode.data, 5, 8, false));
}
return r;
}
/* provide a privkey and return an WIF */
coinjs.privkey2wif = function(h){
var r = Crypto.util.hexToBytes(h);
if(coinjs.compressed==true){
r.push(0x01);
}
r.unshift(coinjs.priv);
var hash = Crypto.SHA256(Crypto.SHA256(r, {asBytes: true}), {asBytes: true});
var checksum = hash.slice(0, 4);
return coinjs.base58encode(r.concat(checksum));
}
/* convert a wif key back to a private key */
coinjs.wif2privkey = function(wif){
var compressed = false;
var decode = coinjs.base58decode(wif);
var key = decode.slice(0, decode.length-4);
key = key.slice(1, key.length);
if(key.length>=33 && key[key.length-1]==0x01){
key = key.slice(0, key.length-1);
compressed = true;
}
return {'privkey': Crypto.util.bytesToHex(key), 'compressed':compressed};
}
/* convert a wif to a pubkey */
coinjs.wif2pubkey = function(wif){
var compressed = coinjs.compressed;
var r = coinjs.wif2privkey(wif);
coinjs.compressed = r['compressed'];
var pubkey = coinjs.newPubkey(r['privkey']);
coinjs.compressed = compressed;
return {'pubkey':pubkey,'compressed':r['compressed']};
}
/* convert a wif to a address */
coinjs.wif2address = function(wif){
var r = coinjs.wif2pubkey(wif);
return {'address':coinjs.pubkey2address(r['pubkey']), 'compressed':r['compressed']};
}
/* decode or validate an address and return the hash */
coinjs.addressDecode = function(addr){
try {
var bytes = coinjs.base58decode(addr);
var front = bytes.slice(0, bytes.length-4);
var back = bytes.slice(bytes.length-4);
var checksum = Crypto.SHA256(Crypto.SHA256(front, {asBytes: true}), {asBytes: true}).slice(0, 4);
if (checksum+"" == back+"") {
var o = {};
o.bytes = front.slice(1);
o.version = front[0];
if(o.version==coinjs.pub){ // standard address
o.type = 'standard';
} else if (o.version==coinjs.multisig) { // multisig address
o.type = 'multisig';
} else if (o.version==coinjs.priv){ // wifkey
o.type = 'wifkey';
} else if (o.version==42) { // stealth address
o.type = 'stealth';
o.option = front[1];
if (o.option != 0) {
alert("Stealth Address option other than 0 is currently not supported!");
return false;
};
o.scankey = Crypto.util.bytesToHex(front.slice(2, 35));
o.n = front[35];
if (o.n > 1) {
alert("Stealth Multisig is currently not supported!");
return false;
};
o.spendkey = Crypto.util.bytesToHex(front.slice(36, 69));
o.m = front[69];
o.prefixlen = front[70];
if (o.prefixlen > 0) {
alert("Stealth Address Prefixes are currently not supported!");
return false;
};
o.prefix = front.slice(71);
} else { // everything else
o.type = 'other'; // address is still valid but unknown version
}
return o;
} else {
throw "Invalid checksum";
}
} catch(e) {
bech32rs = coinjs.bech32redeemscript(addr);
if(bech32rs){
return {'type':'bech32', 'redeemscript':bech32rs};
} else {
return false;
}
}
}
/* retreive the balance from a given address */
coinjs.addressBalance = function(address, callback){
coinjs.ajax(coinjs.host+'?uid='+coinjs.uid+'&key='+coinjs.key+'&setmodule=addresses&request=bal&address='+address+'&r='+Math.random(), callback, "GET");
}
/* decompress an compressed public key */
coinjs.pubkeydecompress = function(pubkey) {
if((typeof(pubkey) == 'string') && pubkey.match(/^[a-f0-9]+$/i)){
var curve = EllipticCurve.getSECCurveByName("secp256k1");
try {
var pt = curve.curve.decodePointHex(pubkey);
var x = pt.getX().toBigInteger();
var y = pt.getY().toBigInteger();
var publicKeyBytes = EllipticCurve.integerToBytes(x, 32);
publicKeyBytes = publicKeyBytes.concat(EllipticCurve.integerToBytes(y,32));
publicKeyBytes.unshift(0x04);
return Crypto.util.bytesToHex(publicKeyBytes);
} catch (e) {
// console.log(e);
return false;
}
}
return false;
}
coinjs.bech32_polymod = function(values) {
var chk = 1;
var BECH32_GENERATOR = [0x3b6a57b2, 0x26508e6d, 0x1ea119fa, 0x3d4233dd, 0x2a1462b3];
for (var p = 0; p < values.length; ++p) {
var top = chk >> 25;
chk = (chk & 0x1ffffff) << 5 ^ values[p];
for (var i = 0; i < 5; ++i) {
if ((top >> i) & 1) {
chk ^= BECH32_GENERATOR[i];
}
}
}
return chk;
}
coinjs.bech32_hrpExpand = function(hrp) {
var ret = [];
var p;
for (p = 0; p < hrp.length; ++p) {
ret.push(hrp.charCodeAt(p) >> 5);
}
ret.push(0);
for (p = 0; p < hrp.length; ++p) {
ret.push(hrp.charCodeAt(p) & 31);
}
return ret;
}
coinjs. bech32_verifyChecksum = function(hrp, data) {
return coinjs.bech32_polymod(coinjs.bech32_hrpExpand(hrp).concat(data)) === 1;
}
coinjs.bech32_createChecksum = function(hrp, data) {
var values = coinjs.bech32_hrpExpand(hrp).concat(data).concat([0, 0, 0, 0, 0, 0]);
var mod = coinjs.bech32_polymod(values) ^ 1;
var ret = [];
for (var p = 0; p < 6; ++p) {
ret.push((mod >> 5 * (5 - p)) & 31);
}
return ret;
}
coinjs.bech32_encode = function(hrp, data) {
var combined = data.concat(coinjs.bech32_createChecksum(hrp, data));
var ret = hrp + '1';
for (var p = 0; p < combined.length; ++p) {
ret += coinjs.bech32.charset.charAt(combined[p]);
}
return ret;
}
coinjs.bech32_decode = function(bechString) {
var p;
var has_lower = false;
var has_upper = false;
for (p = 0; p < bechString.length; ++p) {
if (bechString.charCodeAt(p) < 33 || bechString.charCodeAt(p) > 126) {
return null;
}
if (bechString.charCodeAt(p) >= 97 && bechString.charCodeAt(p) <= 122) {
has_lower = true;
}
if (bechString.charCodeAt(p) >= 65 && bechString.charCodeAt(p) <= 90) {
has_upper = true;
}
}
if (has_lower && has_upper) {
return null;
}
bechString = bechString.toLowerCase();
var pos = bechString.lastIndexOf('1');
if (pos < 1 || pos + 7 > bechString.length || bechString.length > 90) {
return null;
}
var hrp = bechString.substring(0, pos);
var data = [];
for (p = pos + 1; p < bechString.length; ++p) {
var d = coinjs.bech32.charset.indexOf(bechString.charAt(p));
if (d === -1) {
return null;
}
data.push(d);
}
if (!coinjs.bech32_verifyChecksum(hrp, data)) {
return null;
}
return {
hrp: hrp,
data: data.slice(0, data.length - 6)
};
}
coinjs.bech32_convert = function(data, inBits, outBits, pad) {
var value = 0;
var bits = 0;
var maxV = (1 << outBits) - 1;
var result = [];
for (var i = 0; i < data.length; ++i) {
value = (value << inBits) | data[i];
bits += inBits;
while (bits >= outBits) {
bits -= outBits;
result.push((value >> bits) & maxV);
}
}
if (pad) {
if (bits > 0) {
result.push((value << (outBits - bits)) & maxV);
}
} else {
if (bits >= inBits) throw new Error('Excess padding');
if ((value << (outBits - bits)) & maxV) throw new Error('Non-zero padding');
}
return result;
}
coinjs.testdeterministicK = function() {
// https://github.com/bitpay/bitcore/blob/9a5193d8e94b0bd5b8e7f00038e7c0b935405a03/test/crypto/ecdsa.js
// Line 21 and 22 specify digest hash and privkey for the first 2 test vectors.
// Line 96-117 tells expected result.
var tx = coinjs.transaction();
var test_vectors = [
{
'message': 'test data',
'privkey': 'fee0a1f7afebf9d2a5a80c0c98a31c709681cce195cbcd06342b517970c0be1e',
'k_bad00': 'fcce1de7a9bcd6b2d3defade6afa1913fb9229e3b7ddf4749b55c4848b2a196e',
'k_bad01': '727fbcb59eb48b1d7d46f95a04991fc512eb9dbf9105628e3aec87428df28fd8',
'k_bad15': '398f0e2c9f79728f7b3d84d447ac3a86d8b2083c8f234a0ffa9c4043d68bd258'
},
{
'message': 'Everything should be made as simple as possible, but not simpler.',
'privkey': '0000000000000000000000000000000000000000000000000000000000000001',
'k_bad00': 'ec633bd56a5774a0940cb97e27a9e4e51dc94af737596a0c5cbb3d30332d92a5',
'k_bad01': 'df55b6d1b5c48184622b0ead41a0e02bfa5ac3ebdb4c34701454e80aabf36f56',
'k_bad15': 'def007a9a3c2f7c769c75da9d47f2af84075af95cadd1407393dc1e26086ef87'
},
{
'message': 'Satoshi Nakamoto',
'privkey': '0000000000000000000000000000000000000000000000000000000000000002',
'k_bad00': 'd3edc1b8224e953f6ee05c8bbf7ae228f461030e47caf97cde91430b4607405e',
'k_bad01': 'f86d8e43c09a6a83953f0ab6d0af59fb7446b4660119902e9967067596b58374',
'k_bad15': '241d1f57d6cfd2f73b1ada7907b199951f95ef5ad362b13aed84009656e0254a'
},
{
'message': 'Diffie Hellman',
'privkey': '7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f',
'k_bad00': 'c378a41cb17dce12340788dd3503635f54f894c306d52f6e9bc4b8f18d27afcc',
'k_bad01': '90756c96fef41152ac9abe08819c4e95f16da2af472880192c69a2b7bac29114',
'k_bad15': '7b3f53300ab0ccd0f698f4d67db87c44cf3e9e513d9df61137256652b2e94e7c'
},
{
'message': 'Japan',
'privkey': '8080808080808080808080808080808080808080808080808080808080808080',
'k_bad00': 'f471e61b51d2d8db78f3dae19d973616f57cdc54caaa81c269394b8c34edcf59',
'k_bad01': '6819d85b9730acc876fdf59e162bf309e9f63dd35550edf20869d23c2f3e6d17',
'k_bad15': 'd8e8bae3ee330a198d1f5e00ad7c5f9ed7c24c357c0a004322abca5d9cd17847'
},
{
'message': 'Bitcoin',
'privkey': 'fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364140',
'k_bad00': '36c848ffb2cbecc5422c33a994955b807665317c1ce2a0f59c689321aaa631cc',
'k_bad01': '4ed8de1ec952a4f5b3bd79d1ff96446bcd45cabb00fc6ca127183e14671bcb85',
'k_bad15': '56b6f47babc1662c011d3b1f93aa51a6e9b5f6512e9f2e16821a238d450a31f8'
},
{
'message': 'i2FLPP8WEus5WPjpoHwheXOMSobUJVaZM1JPMQZq',
'privkey': 'fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364140',
'k_bad00': '6e9b434fcc6bbb081a0463c094356b47d62d7efae7da9c518ed7bac23f4e2ed6',
'k_bad01': 'ae5323ae338d6117ce8520a43b92eacd2ea1312ae514d53d8e34010154c593bb',
'k_bad15': '3eaa1b61d1b8ab2f1ca71219c399f2b8b3defa624719f1e96fe3957628c2c4ea'
},
{
'message': 'lEE55EJNP7aLrMtjkeJKKux4Yg0E8E1SAJnWTCEh',
'privkey': '3881e5286abc580bb6139fe8e83d7c8271c6fe5e5c2d640c1f0ed0e1ee37edc9',
'k_bad00': '5b606665a16da29cc1c5411d744ab554640479dd8abd3c04ff23bd6b302e7034',
'k_bad01': 'f8b25263152c042807c992eacd2ac2cc5790d1e9957c394f77ea368e3d9923bd',
'k_bad15': 'ea624578f7e7964ac1d84adb5b5087dd14f0ee78b49072aa19051cc15dab6f33'
},
{
'message': '2SaVPvhxkAPrayIVKcsoQO5DKA8Uv5X/esZFlf+y',
'privkey': '7259dff07922de7f9c4c5720d68c9745e230b32508c497dd24cb95ef18856631',
'k_bad00': '3ab6c19ab5d3aea6aa0c6da37516b1d6e28e3985019b3adb388714e8f536686b',
'k_bad01': '19af21b05004b0ce9cdca82458a371a9d2cf0dc35a813108c557b551c08eb52e',
'k_bad15': '117a32665fca1b7137a91c4739ac5719fec0cf2e146f40f8e7c21b45a07ebc6a'
},
{
'message': '00A0OwO2THi7j5Z/jp0FmN6nn7N/DQd6eBnCS+/b',
'privkey': '0d6ea45d62b334777d6995052965c795a4f8506044b4fd7dc59c15656a28f7aa',
'k_bad00': '79487de0c8799158294d94c0eb92ee4b567e4dc7ca18addc86e49d31ce1d2db6',
'k_bad01': '9561d2401164a48a8f600882753b3105ebdd35e2358f4f808c4f549c91490009',
'k_bad15': 'b0d273634129ff4dbdf0df317d4062a1dbc58818f88878ffdb4ec511c77976c0'
}
];
var result_txt = '\n----------------------\nResults\n----------------------\n\n';
for (i = 0; i < test_vectors.length; i++) {
var hash = Crypto.SHA256(test_vectors[i]['message'].split('').map(function (c) { return c.charCodeAt (0); }), { asBytes: true });
var wif = coinjs.privkey2wif(test_vectors[i]['privkey']);
var KBigInt = tx.deterministicK(wif, hash);
var KBigInt0 = tx.deterministicK(wif, hash, 0);
var KBigInt1 = tx.deterministicK(wif, hash, 1);
var KBigInt15 = tx.deterministicK(wif, hash, 15);
var K = Crypto.util.bytesToHex(KBigInt.toByteArrayUnsigned());
var K0 = Crypto.util.bytesToHex(KBigInt0.toByteArrayUnsigned());
var K1 = Crypto.util.bytesToHex(KBigInt1.toByteArrayUnsigned());
var K15 = Crypto.util.bytesToHex(KBigInt15.toByteArrayUnsigned());
if (K != test_vectors[i]['k_bad00']) {
result_txt += 'Failed Test #' + (i + 1) + '\n K = ' + K + '\nExpected = ' + test_vectors[i]['k_bad00'] + '\n\n';
} else if (K0 != test_vectors[i]['k_bad00']) {
result_txt += 'Failed Test #' + (i + 1) + '\n K0 = ' + K0 + '\nExpected = ' + test_vectors[i]['k_bad00'] + '\n\n';
} else if (K1 != test_vectors[i]['k_bad01']) {
result_txt += 'Failed Test #' + (i + 1) + '\n K1 = ' + K1 + '\nExpected = ' + test_vectors[i]['k_bad01'] + '\n\n';
} else if (K15 != test_vectors[i]['k_bad15']) {
result_txt += 'Failed Test #' + (i + 1) + '\n K15 = ' + K15 + '\nExpected = ' + test_vectors[i]['k_bad15'] + '\n\n';
};
};
if (result_txt.length < 60) {
result_txt = 'All Tests OK!';
};
return result_txt;
};
/* start of hd functions, thanks bip32.org */
coinjs.hd = function(data){
var r = {};
/* some hd value parsing */
r.parse = function() {
var bytes = [];
// some quick validation
if(typeof(data) == 'string'){
var decoded = coinjs.base58decode(data);
if(decoded.length == 82){
var checksum = decoded.slice(78, 82);
var hash = Crypto.SHA256(Crypto.SHA256(decoded.slice(0, 78), { asBytes: true } ), { asBytes: true } );
if(checksum[0]==hash[0] && checksum[1]==hash[1] && checksum[2]==hash[2] && checksum[3]==hash[3]){
bytes = decoded.slice(0, 78);
}
}
}
// actual parsing code
if(bytes && bytes.length>0) {
r.version = coinjs.uint(bytes.slice(0, 4) , 4);
r.depth = coinjs.uint(bytes.slice(4, 5) ,1);
r.parent_fingerprint = bytes.slice(5, 9);
r.child_index = coinjs.uint(bytes.slice(9, 13), 4);
r.chain_code = bytes.slice(13, 45);
r.key_bytes = bytes.slice(45, 78);
var c = coinjs.compressed; // get current default
coinjs.compressed = true;
if(r.key_bytes[0] == 0x00) {
r.type = 'private';
var privkey = (r.key_bytes).slice(1, 33);
var privkeyHex = Crypto.util.bytesToHex(privkey);
var pubkey = coinjs.newPubkey(privkeyHex);
r.keys = {'privkey':privkeyHex,
'pubkey':pubkey,
'address':coinjs.pubkey2address(pubkey),
'wif':coinjs.privkey2wif(privkeyHex)};
} else if(r.key_bytes[0] == 0x02 || r.key_bytes[0] == 0x03) {
r.type = 'public';
var pubkeyHex = Crypto.util.bytesToHex(r.key_bytes);
r.keys = {'pubkey': pubkeyHex,
'address':coinjs.pubkey2address(pubkeyHex)};
} else {
r.type = 'invalid';
}
r.keys_extended = r.extend();
coinjs.compressed = c; // reset to default
}
return r;
}
// extend prv/pub key
r.extend = function(){
var hd = coinjs.hd();
return hd.make({'depth':(this.depth*1)+1,
'parent_fingerprint':this.parent_fingerprint,
'child_index':this.child_index,
'chain_code':this.chain_code,
'privkey':this.keys.privkey,
'pubkey':this.keys.pubkey});
}
// derive from path
r.derive_path = function(path) {
if( path == 'm' || path == 'M' || path == 'm\'' || path == 'M\'' ) return this;
var p = path.split('/');
var hdp = coinjs.clone(this); // clone hd path
for( var i in p ) {
if((( i == 0 ) && c != 'm') || i == 'remove'){
continue;
}
var c = p[i];
var use_private = (c.length > 1) && (c[c.length-1] == '\'');
var child_index = parseInt(use_private ? c.slice(0, c.length - 1) : c) & 0x7fffffff;
if(use_private)
child_index += 0x80000000;
hdp = hdp.derive(child_index);
var key = ((hdp.keys_extended.privkey) && hdp.keys_extended.privkey!='') ? hdp.keys_extended.privkey : hdp.keys_extended.pubkey;
hdp = coinjs.hd(key);
}
return hdp;
}
// derive key from index
r.derive = function(i){
i = (i)?i:0;
var blob = (Crypto.util.hexToBytes(this.keys.pubkey)).concat(coinjs.numToBytes(i,4).reverse());
var j = new jsSHA(Crypto.util.bytesToHex(blob), 'HEX');
var hash = j.getHMAC(Crypto.util.bytesToHex(r.chain_code), "HEX", "SHA-512", "HEX");
var il = new BigInteger(hash.slice(0, 64), 16);
var ir = Crypto.util.hexToBytes(hash.slice(64,128));
var ecparams = EllipticCurve.getSECCurveByName("secp256k1");
var curve = ecparams.getCurve();
var k, key, pubkey, o;
o = coinjs.clone(this);
o.chain_code = ir;
o.child_index = i;
if(this.type=='private'){
// derive key pair from from a xprv key
k = il.add(new BigInteger([0].concat(Crypto.util.hexToBytes(this.keys.privkey)))).mod(ecparams.getN());
key = Crypto.util.bytesToHex(k.toByteArrayUnsigned());
pubkey = coinjs.newPubkey(key);
o.keys = {'privkey':key,
'pubkey':pubkey,
'wif':coinjs.privkey2wif(key),
'address':coinjs.pubkey2address(pubkey)};
} else if (this.type=='public'){
// derive xpub key from an xpub key
q = ecparams.curve.decodePointHex(this.keys.pubkey);
var curvePt = ecparams.getG().multiply(il).add(q);
var x = curvePt.getX().toBigInteger();
var y = curvePt.getY().toBigInteger();
var publicKeyBytesCompressed = EllipticCurve.integerToBytes(x,32)
if (y.isEven()){
publicKeyBytesCompressed.unshift(0x02)
} else {
publicKeyBytesCompressed.unshift(0x03)
}
pubkey = Crypto.util.bytesToHex(publicKeyBytesCompressed);
o.keys = {'pubkey':pubkey,
'address':coinjs.pubkey2address(pubkey)}
} else {
// fail
}
o.parent_fingerprint = (ripemd160(Crypto.SHA256(Crypto.util.hexToBytes(r.keys.pubkey),{asBytes:true}),{asBytes:true})).slice(0,4);
o.keys_extended = o.extend();
return o;
}
// make a master hd xprv/xpub
r.master = function(pass) {
var seed = (pass) ? Crypto.SHA256(pass) : coinjs.newPrivkey();
var hasher = new jsSHA(seed, 'HEX');
var I = hasher.getHMAC("Bitcoin seed", "TEXT", "SHA-512", "HEX");
var privkey = Crypto.util.hexToBytes(I.slice(0, 64));
var chain = Crypto.util.hexToBytes(I.slice(64, 128));
var hd = coinjs.hd();
return hd.make({'depth':0,
'parent_fingerprint':[0,0,0,0],
'child_index':0,
'chain_code':chain,
'privkey':I.slice(0, 64),
'pubkey':coinjs.newPubkey(I.slice(0, 64))});
}
// encode data to a base58 string
r.make = function(data){ // { (int) depth, (array) parent_fingerprint, (int) child_index, (byte array) chain_code, (hex str) privkey, (hex str) pubkey}
var k = [];
//depth
k.push(data.depth*1);
//parent fingerprint
k = k.concat(data.parent_fingerprint);
//child index
k = k.concat((coinjs.numToBytes(data.child_index, 4)).reverse());
//Chain code
k = k.concat(data.chain_code);
var o = {}; // results
//encode xprv key
if(data.privkey){
var prv = (coinjs.numToBytes(coinjs.hdkey.prv, 4)).reverse();
prv = prv.concat(k);
prv.push(0x00);
prv = prv.concat(Crypto.util.hexToBytes(data.privkey));
var hash = Crypto.SHA256( Crypto.SHA256(prv, { asBytes: true } ), { asBytes: true } );
var checksum = hash.slice(0, 4);
var ret = prv.concat(checksum);
o.privkey = coinjs.base58encode(ret);
}
//encode xpub key
if(data.pubkey){
var pub = (coinjs.numToBytes(coinjs.hdkey.pub, 4)).reverse();
pub = pub.concat(k);
pub = pub.concat(Crypto.util.hexToBytes(data.pubkey));
var hash = Crypto.SHA256( Crypto.SHA256(pub, { asBytes: true } ), { asBytes: true } );
var checksum = hash.slice(0, 4);
var ret = pub.concat(checksum);
o.pubkey = coinjs.base58encode(ret);
}
return o;
}
return r.parse();
}
/* start of script functions */
coinjs.script = function(data) {
var r = {};
if(!data){
r.buffer = [];
} else if ("string" == typeof data) {
r.buffer = Crypto.util.hexToBytes(data);
} else if (coinjs.isArray(data)) {
r.buffer = data;
} else if (data instanceof coinjs.script) {
r.buffer = data.buffer;
} else {
r.buffer = data;
}
/* parse buffer array */
r.parse = function () {
var self = this;
r.chunks = [];
var i = 0;
function readChunk(n) {
self.chunks.push(self.buffer.slice(i, i + n));
i += n;
};
while (i < this.buffer.length) {
var opcode = this.buffer[i++];
if (opcode >= 0xF0) {
opcode = (opcode << 8) | this.buffer[i++];
}
var len;
if (opcode > 0 && opcode < 76) { //OP_PUSHDATA1
readChunk(opcode);
} else if (opcode == 76) { //OP_PUSHDATA1
len = this.buffer[i++];
readChunk(len);
} else if (opcode == 77) { //OP_PUSHDATA2
len = (this.buffer[i++] << 8) | this.buffer[i++];
readChunk(len);
} else if (opcode == 78) { //OP_PUSHDATA4
len = (this.buffer[i++] << 24) | (this.buffer[i++] << 16) | (this.buffer[i++] << 8) | this.buffer[i++];
readChunk(len);
} else {
this.chunks.push(opcode);
}
if(i<0x00){
break;
}
}
return true;
};
/* decode the redeemscript of a multisignature transaction */
r.decodeRedeemScript = function(script){
var r = false;
try {
var s = coinjs.script(Crypto.util.hexToBytes(script));
if((s.chunks.length>=3) && s.chunks[s.chunks.length-1] == 174){//OP_CHECKMULTISIG
r = {};
r.signaturesRequired = s.chunks[0]-80;
var pubkeys = [];
for(var i=1;i<s.chunks.length-2;i++){
pubkeys.push(Crypto.util.bytesToHex(s.chunks[i]));
}
r.pubkeys = pubkeys;
var multi = coinjs.pubkeys2MultisigAddress(pubkeys, r.signaturesRequired);
r.address = multi['address'];
r.type = 'multisig__'; // using __ for now to differentiat from the other object .type == "multisig"
var rs = Crypto.util.bytesToHex(s.buffer);
r.redeemscript = rs;
} else if((s.chunks.length==2) && (s.buffer[0] == 0 && s.buffer[1] == 20)){ // SEGWIT
r = {};
r.type = "segwit__";
var rs = Crypto.util.bytesToHex(s.buffer);
r.address = coinjs.pubkey2address(rs, coinjs.multisig);
r.redeemscript = rs;
} else if(s.chunks.length == 5 && s.chunks[1] == 177 && s.chunks[2] == 117 && s.chunks[4] == 172){
// ^ <unlocktime> OP_CHECKLOCKTIMEVERIFY OP_DROP <pubkey> OP_CHECKSIG ^
r = {}
r.pubkey = Crypto.util.bytesToHex(s.chunks[3]);
r.checklocktimeverify = coinjs.bytesToNum(s.chunks[0].slice());
r.address = coinjs.simpleHodlAddress(r.pubkey, r.checklocktimeverify).address;
var rs = Crypto.util.bytesToHex(s.buffer);
r.redeemscript = rs;
r.type = "hodl__";
}
} catch(e) {
// console.log(e);
r = false;
}
return r;
}
/* create output script to spend */
r.spendToScript = function(address){
var addr = coinjs.addressDecode(address);
var s = coinjs.script();
if(addr.type == "bech32"){
s.writeOp(0);
s.writeBytes(Crypto.util.hexToBytes(addr.redeemscript));
} else if(addr.version==coinjs.multisig){ // multisig address
s.writeOp(169); //OP_HASH160
s.writeBytes(addr.bytes);
s.writeOp(135); //OP_EQUAL
} else { // regular address
s.writeOp(118); //OP_DUP
s.writeOp(169); //OP_HASH160
s.writeBytes(addr.bytes);
s.writeOp(136); //OP_EQUALVERIFY
s.writeOp(172); //OP_CHECKSIG
}
return s;
}
/* geneate a (script) pubkey hash of the address - used for when signing */
r.pubkeyHash = function(address) {
var addr = coinjs.addressDecode(address);
var s = coinjs.script();
s.writeOp(118);//OP_DUP
s.writeOp(169);//OP_HASH160
s.writeBytes(addr.bytes);
s.writeOp(136);//OP_EQUALVERIFY
s.writeOp(172);//OP_CHECKSIG
return s;
}
/* write to buffer */
r.writeOp = function(op){
this.buffer.push(op);
this.chunks.push(op);
return true;
}
/* write bytes to buffer */
r.writeBytes = function(data){
if (data.length < 76) { //OP_PUSHDATA1
this.buffer.push(data.length);
} else if (data.length <= 0xff) {
this.buffer.push(76); //OP_PUSHDATA1
this.buffer.push(data.length);
} else if (data.length <= 0xffff) {
this.buffer.push(77); //OP_PUSHDATA2
this.buffer.push(data.length & 0xff);
this.buffer.push((data.length >>> 8) & 0xff);
} else {
this.buffer.push(78); //OP_PUSHDATA4
this.buffer.push(data.length & 0xff);
this.buffer.push((data.length >>> 8) & 0xff);
this.buffer.push((data.length >>> 16) & 0xff);
this.buffer.push((data.length >>> 24) & 0xff);
}
this.buffer = this.buffer.concat(data);
this.chunks.push(data);
return true;
}
r.parse();
return r;
}
/* start of transaction functions */
/* create a new transaction object */
coinjs.transaction = function() {
var r = {};
r.version = 1;
r.lock_time = 0;
r.ins = [];
r.outs = [];
r.witness = false;
r.timestamp = null;
r.block = null;
/* add an input to a transaction */
r.addinput = function(txid, index, script, sequence){
var o = {};
o.outpoint = {'hash':txid, 'index':index};
o.script = coinjs.script(script||[]);
o.sequence = sequence || ((r.lock_time==0) ? 4294967295 : 0);
return this.ins.push(o);
}
/* add an output to a transaction */