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43 lines
1.3 KiB
43 lines
1.3 KiB
11 years ago
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var imports = require('soop').imports();
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var coinUtil = imports.coinUtil || require('../util');
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var cryptox = imports.cryptox || require('./cryptox');
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var crypto = require('crypto');
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var BIP39 = {};
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BIP39.mnemonic = function(wordlist, bits) {
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if (!bits)
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bits = 128;
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if (bits % 32 != 0)
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throw new Error("bits must be multiple of 32");
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var bytes = crypto.randomBytes(bits / 8);
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return BIP39.to_mnemonic(wordlist, bytes);
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}
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BIP39.to_mnemonic = function(wordlist, bytes) {
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var hash = coinUtil.sha256(new Buffer(bytes));
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var bin = "";
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var bits = bytes.length * 8;
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for (var i = 0 ; i < bytes.length ; i++) {
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bin = bin + ("00000000" + bytes[i].toString(2)).slice(-8);
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}
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var hashbits = hash[0].toString(2);
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hashbits = ("00000000" + hashbits).slice(-8).slice(0, bits/32);
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bin = bin + hashbits;
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if (bin.length % 11 != 0)
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throw new Error("interal error - entropy not an even multiple of 11 bits - " + bin.length);
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var mnemonic = "";
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for (var i = 0 ; i < bin.length / 11 ; i++) {
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if (mnemonic != "")
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mnemonic = mnemonic + " ";
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var wi = parseInt(bin.slice(i*11, (i+1)*11), 2);
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mnemonic = mnemonic + wordlist[wi];
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}
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return mnemonic;
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}
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BIP39.mnemonic_to_seed = function(mnemonic, passphrase) {
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return cryptox.pbkdf2Sync_sha512(mnemonic, "mnemonic" + passphrase, 2048, 64);
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}
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module.exports = require('soop')(BIP39);
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