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Card entropy uses secure hashing when > 256 bits

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Ian Coleman
2016-12-22 15:40:41 +11:00
parent 0a1f0259d1
commit 9d33c8925d
2 changed files with 21 additions and 24 deletions
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7
src/js/entropy.js
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@@ -293,15 +293,12 @@ window.Entropy = new (function() {
// Create a normalized string of the selected cards
var normalizedCards = cards.join("").toUpperCase();
// 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.
var entropyBin = "";
var iterations = 0;
while (entropyBin.length < numberOfBits) {
var hashedCards = sjcl.hash.sha256.hash(normalizedCards);
for (var j=0; j<iterations; j++) {
hashedCards = sjcl.hash.sha256.hash(hashedCards);
}
var hashedCards = sjcl.hash.sha256.hash(normalizedCards + ":" + iterations);
var hashHex = sjcl.codec.hex.fromBits(hashedCards);
for (var i=0; i<hashHex.length; i++) {
var decimal = parseInt(hashHex[i], 16);