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Mnemonic length can be set when using raw entropy

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This commit is contained in:
Ian Coleman
2016-11-10 18:58:18 +11:00
parent 1cf1bbaff5
commit 3599674db4
3 changed files with 45 additions and 3 deletions
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2
src/index.html
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@@ -137,7 +137,7 @@
<label class="col-sm-2 control-label">Mnemonic Length</label>
<div class="col-sm-10">
<select class="mnemonic-length form-control">
<option value="raw">From entropy length</option>
<option value="raw">From entropy length (3 words per 32 bits)</option>
<option value="12">12 Words</option>
<option value="15">15 Words</option>
<option value="18">18 Words</option>

21
src/js/index.js
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@@ -68,6 +68,7 @@
DOM.network.on("change", networkChanged);
DOM.useEntropy.on("change", setEntropyVisibility);
DOM.entropy.on("input", delayedEntropyChanged);
DOM.entropyMnemonicLength.on("change", entropyChanged);
DOM.phrase.on("input", delayedPhraseChanged);
DOM.passphrase.on("input", delayedPhraseChanged);
DOM.generate.on("click", generateClicked);
@@ -744,9 +745,25 @@
}
// Show entropy details
showEntropyFeedback(entropy);
// Use entropy hash if not using raw entropy
var bits = entropy.binaryStr;
var mnemonicLength = DOM.entropyMnemonicLength.val();
if (mnemonicLength != "raw") {
// Get bits by hashing entropy with SHA256
var hash = sjcl.hash.sha256.hash(entropy.cleanStr);
var hex = sjcl.codec.hex.fromBits(hash);
bits = BigInteger.parse(hex, 16).toString(2);
for (var i=0; i<256-bits.length; i++) {
bits = "0" + bits;
}
// Truncate hash to suit number of words
mnemonicLength = parseInt(mnemonicLength);
var numberOfBits = 32 * mnemonicLength / 3;
bits = bits.substring(0, numberOfBits);
}
// Discard trailing entropy
var bitsToUse = Math.floor(entropy.binaryStr.length / 32) * 32;
var binaryStr = entropy.binaryStr.substring(0, bitsToUse);
var bitsToUse = Math.floor(bits.length / 32) * 32;
var binaryStr = bits.substring(0, bitsToUse);
// Convert entropy string to numeric array
var entropyArr = [];
for (var i=0; i<binaryStr.length / 8; i++) {

25
tests.js
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@@ -2774,6 +2774,31 @@ page.open(url, function(status) {
});
},
// Mnemonic length can be selected even for weak entropy
function() {
page.open(url, function(status) {
// use entropy
page.evaluate(function() {
$(".use-entropy").prop("checked", true).trigger("change");
$(".entropy").val("012345");
$(".mnemonic-length").val("18").trigger("change");
});
// check the mnemonic is the correct length
waitForGenerate(function() {
var phrase = page.evaluate(function() {
return $(".phrase").val();
});
var numberOfWords = phrase.split(/\s/g).length;
if (numberOfWords != 18) {
console.log("Weak entropy cannot be overridden to give 18 word mnemonic");
console.log(phrase);
fail();
}
next();
});
});
},
// If you wish to add more tests, do so here...
// Here is a blank test template