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Refactor entropyToMnemonic to use buffer and crypto

This commit is contained in:
Wei Lu 2014-05-28 23:10:11 +08:00
parent e625e4defc
commit 9593d0b287
1 changed files with 8 additions and 14 deletions
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22
index.js
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@ -2,7 +2,7 @@ var Crypto = require('crypto-js')
var path = require('path') var path = require('path')
var includeFolder = require('include-folder') var includeFolder = require('include-folder')
var Wordlists = includeFolder(path.join(__dirname, 'wordlists')) var Wordlists = includeFolder(path.join(__dirname, 'wordlists'))
var randomBytes = require('crypto').randomBytes var crypto = require('crypto')
module.exports = BIP39 module.exports = BIP39
@ -17,14 +17,14 @@ BIP39.prototype.mnemonicToSeed = function(mnemonic, password){
} }
BIP39.prototype.entropyToMnemonic = function(entropy){ BIP39.prototype.entropyToMnemonic = function(entropy){
var entropyBytes = hexToBytes(entropy) var entropyBuffer = new Buffer(entropy, 'hex')
var bits = bytesToBinary(entropyBytes) var hash = crypto.createHash('sha256').update(entropyBuffer).digest()
var hash = Crypto.SHA256(bytesToWordArray(entropyBytes)) var combined = Buffer.concat([entropyBuffer, hash])
var checksumBits = bytesToBinary(wordsToBytes(hash.words)) var bitLength = entropyBuffer.length * 8 + entropyBuffer.length / 4
var checksum = checksumBits.substr(0, bits.length / 32) var bits = bytesToBinary([].slice.call(combined)).substr(0, bitLength)
var chunks = (bits + checksum).match(/(.{1,11})/g) var chunks = (bits).match(/(.{1,11})/g)
return chunks.map(function(binary){ return chunks.map(function(binary){
var index = parseInt(binary, 2) var index = parseInt(binary, 2)
return this.wordlist[index] return this.wordlist[index]
@ -33,7 +33,7 @@ BIP39.prototype.entropyToMnemonic = function(entropy){
BIP39.prototype.generateMnemonic = function(strength){ BIP39.prototype.generateMnemonic = function(strength){
strength = strength || 128 strength = strength || 128
var entropy = randomBytes(strength/8).toString('hex') var entropy = crypto.randomBytes(strength/8).toString('hex')
return this.entropyToMnemonic(entropy) return this.entropyToMnemonic(entropy)
} }
@ -79,12 +79,6 @@ function encode_utf8(s){
//=========== helper methods from bitcoinjs-lib ======== //=========== helper methods from bitcoinjs-lib ========
function hexToBytes(hex) {
return hex.match(/../g).map(function(x) {
return parseInt(x,16)
});
}
function bytesToBinary(bytes) { function bytesToBinary(bytes) {
return bytes.map(function(x) { return bytes.map(function(x) {
return lpad(x.toString(2), '0', 8) return lpad(x.toString(2), '0', 8)