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Use HMAC SHA-256 with configurable amount of rounds to generate seed #229

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Use HMAC SHA-256 with configurable amount of rounds to generate seed #229

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17 changes: 16 additions & 1 deletion index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -582,12 +582,27 @@ <h2>New HD Address <small>making bip32 even easier</small></h2>
</span>
</div>

<label>Seed (WIF)</label>
<div class="input-group">
<input id="newHDseed" type="text" class="form-control" value="" readonly>
<span class="input-group-btn">
<button class="deriveHDbtn btn btn-default" type="button"><span title="Derive from key" class="glyphicon glyphicon-chevron-right"></span></button>
</span>
</div>

<h3>Address Options</h3>
<p>You can use the advanced options below to generate different kinds of master addresses.</p>

<div class="checkbox">
<label><input type="checkbox" id="newHDBrainwallet" class="checkbox-inline"> Custom Seed or Brain Wallet</label>
<input type="text" class="form-control hidden" id="HDBrainwallet">
<div class="hidden" id="HDBrainwalletInput">
<input type="text" class="form-control" id="HDBrainwallet">
<span class="text-muted">
Number of HMAC SHA-256 iterations for seed generation, higher value mean's also longer calculation
(use value 0 to calculate just SHA-256, like in previous coinb.in versions):
<input type="text" class="form-control" id="HDBrainwalletIters" value="50000" size="10">
</span>
</div>
</div>

<input type="button" class="btn btn-primary" value="Generate" id="newHDKeysBtn">
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23 changes: 21 additions & 2 deletions js/coin.js
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Expand Up @@ -608,6 +608,7 @@
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.seed_wif = '';
r.key_bytes = bytes.slice(45, 78);

var c = coinjs.compressed; // get current default
Expand Down Expand Up @@ -742,8 +743,23 @@
}

// make a master hd xprv/xpub
r.master = function(pass) {
var seed = (pass) ? Crypto.SHA256(pass) : coinjs.newPrivkey();
r.master = function(pass, iters) {
if (pass) {
var seed_iters = (iters) ? Math.abs(iters * 1) : 0;
if (seed_iters == 0) {
var seed = Crypto.SHA256(pass);
} else {
var seed = Crypto.util.hexToBytes("0000000000000000000000000000000000000000000000000000000000000000");
for (var i = 0; i < seed_iters; i++) {
seed = Crypto.HMAC(Crypto.SHA256, seed, pass, { asBytes: true });
}
seed = Crypto.util.bytesToHex(seed);
}
} else {
var seed = coinjs.newPrivkey();
}

var seed_wif = coinjs.privkey2wif(seed);
var hasher = new jsSHA(seed, 'HEX');
var I = hasher.getHMAC("Bitcoin seed", "TEXT", "SHA-512", "HEX");

Expand All @@ -755,6 +771,7 @@
'parent_fingerprint':[0,0,0,0],
'child_index':0,
'chain_code':chain,
'seed_wif':seed_wif,
'privkey':I.slice(0, 64),
'pubkey':coinjs.newPubkey(I.slice(0, 64))});
}
Expand Down Expand Up @@ -799,6 +816,8 @@
var ret = pub.concat(checksum);
o.pubkey = coinjs.base58encode(ret);
}

o.seed_wif = data.seed_wif;
return o;
}

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9 changes: 6 additions & 3 deletions js/coinbin.js
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Original file line number Diff line number Diff line change
Expand Up @@ -570,18 +570,20 @@ $(document).ready(function() {
$("#newHDKeysBtn").click(function(){
coinjs.compressed = true;
var s = ($("#newHDBrainwallet").is(":checked")) ? $("#HDBrainwallet").val() : null;
var siters = ($("#newHDBrainwallet").is(":checked")) ? $("#HDBrainwalletIters").val()*1 : null;
var hd = coinjs.hd();
var pair = hd.master(s);
var pair = hd.master(s, siters);
$("#newHDxpub").val(pair.pubkey);
$("#newHDxprv").val(pair.privkey);
$("#newHDseed").val(pair.seed_wif);

});

$("#newHDBrainwallet").click(function(){
if($(this).is(":checked")){
$("#HDBrainwallet").removeClass("hidden");
$("#HDBrainwalletInput").removeClass("hidden");
} else {
$("#HDBrainwallet").addClass("hidden");
$("#HDBrainwalletInput").addClass("hidden");
}
});

Expand Down Expand Up @@ -1681,6 +1683,7 @@ $(document).ready(function() {
if(hex == hex_cmp_prv || hex == hex_cmp_pub){
var hd = coinjs.hd(s);
$("#verifyHDaddress .hdKey").html(s);
$("#verifyHDaddress .seed_wif").val(hd.seed_wif);
$("#verifyHDaddress .chain_code").val(Crypto.util.bytesToHex(hd.chain_code));
$("#verifyHDaddress .depth").val(hd.depth);
$("#verifyHDaddress .version").val('0x'+(hd.version).toString(16));
Expand Down