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Cards can be used for entropy

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Format is [A2-9TJQK][CDHS]
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Ian Coleman
2016-11-07 16:01:21 +11:00
parent 6606c50fd3
commit adc8ce127d
3 changed files with 279 additions and 98 deletions
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21
src/js/index.js
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@@ -738,33 +738,36 @@
// Show entropy details
var extraBits = 32 - (entropy.binaryStr.length % 32);
var extraChars = Math.ceil(extraBits * Math.log(2) / Math.log(entropy.base.asInt));
var words = Math.floor(entropy.binaryStr.length / 32) * 3;
var strength = "an extremely weak";
if (entropy.hexStr.length >= 8) {
if (words >= 3) {
strength = "a very weak";
}
if (entropy.hexStr.length >= 12) {
if (words >= 6) {
strength = "a weak";
}
if (entropy.hexStr.length >= 24) {
if (words >= 9) {
strength = "a strong";
}
if (entropy.hexStr.length >= 32) {
if (words >= 12) {
strength = "a very strong";
}
if (entropy.hexStr.length >= 40) {
if (words >= 15) {
strength = "an extremely strong";
}
if (entropy.hexStr.length >=48) {
if (words >= 18) {
strength = "an even stronger"
}
var msg = "Have " + entropy.binaryStr.length + " bits of entropy, " + extraChars + " more " + entropy.base.str + " chars required to generate " + strength + " mnemonic: " + entropy.cleanStr;
showEntropyError(msg);
// Discard trailing entropy
var hexStr = entropy.hexStr.substring(0, Math.floor(entropy.hexStr.length / 8) * 8);
var bitsToUse = Math.floor(entropy.binaryStr.length / 32) * 32;
var binaryStr = entropy.binaryStr.substring(0, bitsToUse);
// Convert entropy string to numeric array
var entropyArr = [];
for (var i=0; i<hexStr.length / 2; i++) {
var entropyByte = parseInt(hexStr[i*2].concat(hexStr[i*2+1]), 16);
for (var i=0; i<binaryStr.length / 8; i++) {
var byteAsBits = binaryStr.substring(i*8, i*8+8);
var entropyByte = parseInt(byteAsBits, 2);
entropyArr.push(entropyByte)
}
// Convert entropy array to mnemonic