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Card entropy changes compiled into standalone

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Ian Coleman
2016-12-22 15:44:07 +11:00
parent bf9bdfd20f
commit 434caecd96
1 changed files with 10 additions and 5 deletions
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bip39-standalone.html
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@@ -521,6 +521,14 @@
random enough for the needs of this tool. random enough for the needs of this tool.
</span> </span>
</p> </p>
<p>
<strong><span data-translate>Do not store entropy.</span></strong>
</p>
<p>
<span data-translate>Storing entropy (such as keeping a deck of cards in a specific shuffled order) is unreliable compared to storing a mnemonic.</span>
<span data-translate>Instead of storing entropy, store the mnemonic generated from the entropy.</span>
<span data-translate-html><a href="https://en.wikipedia.org/wiki/Steganography#Physical" target="_blank">Steganography</a> may be beneficial when storing the mnemonic.</span>
</p>
<p> <p>
<span data-translate-html> <span data-translate-html>
The random mnemonic generator on this page uses a The random mnemonic generator on this page uses a
@@ -18584,15 +18592,12 @@ window.Entropy = new (function() {
// Create a normalized string of the selected cards // Create a normalized string of the selected cards
var normalizedCards = cards.join("").toUpperCase(); var normalizedCards = cards.join("").toUpperCase();
// Convert to binary using the SHA256 hash of the normalized cards. // Convert to binary using the SHA256 hash of the normalized cards.
// If the number of bits is more than 256, multiple rounds of hashing // If the number of bits is more than 256, multiple hashes
// are used until the required number of bits is reached. // are used until the required number of bits is reached.
var entropyBin = ""; var entropyBin = "";
var iterations = 0; var iterations = 0;
while (entropyBin.length < numberOfBits) { while (entropyBin.length < numberOfBits) {
var hashedCards = sjcl.hash.sha256.hash(normalizedCards); var hashedCards = sjcl.hash.sha256.hash(normalizedCards + ":" + iterations);
for (var j=0; j<iterations; j++) {
hashedCards = sjcl.hash.sha256.hash(hashedCards);
}
var hashHex = sjcl.codec.hex.fromBits(hashedCards); var hashHex = sjcl.codec.hex.fromBits(hashedCards);
for (var i=0; i<hashHex.length; i++) { for (var i=0; i<hashHex.length; i++) {
var decimal = parseInt(hashHex[i], 16); var decimal = parseInt(hashHex[i], 16);