LBRYCommunity/bitcoinjs-lib
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Rewrite util.js for readability

Browse source
This commit is contained in:
Andreas Brekken 2014-01-11 13:57:05 +07:00
parent 3ef468ec8b
commit 61992462e3
1 changed files with 58 additions and 61 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

49
src/util.js
View file

@ -1,31 +1,29 @@
var BigInteger = require('./jsbn/jsbn');
var Crypto = require('./crypto-js/crypto'); var Crypto = require('./crypto-js/crypto');
module.exports = {
/** /**
* Cross-browser compatibility version of Array.isArray. * Cross-browser compatibility version of Array.isArray.
*/ */
isArray: Array.isArray || function(o) exports.isArray = Array.isArray || function(o) {
{
return Object.prototype.toString.call(o) === '[object Array]'; return Object.prototype.toString.call(o) === '[object Array]';
}, }
/** /**
* Create a byte array representing a number with the given length * Create a byte array representing a number with the given length
*/ */
numToBytes: function(num,bytes) { exports.numToBytes = function(num, bytes) {
if (bytes === undefined) bytes = 8; if (bytes === undefined) bytes = 8;
if (bytes == 0) return []; if (bytes === 0) return [];
else return [num % 256].concat(module.exports.numToBytes(Math.floor(num / 256),bytes-1)); return [num % 256].concat(module.exports.numToBytes(Math.floor(num / 256), bytes - 1));
}, }
/** /**
* Convert a byte array to the number that it represents * Convert a byte array to the number that it represents
*/ */
bytesToNum: function(bytes) { exports.bytesToNum = function(bytes) {
if (bytes.length == 0) return 0; if (bytes.length === 0) return 0;
else return bytes[0] + 256 * module.exports.bytesToNum(bytes.slice(1)); return bytes[0] + 256 * module.exports.bytesToNum(bytes.slice(1));
}, }
/** /**
* Turn an integer into a "var_int". * Turn an integer into a "var_int".
* *
@ -33,23 +31,22 @@ module.exports = {
* *
* Returns a byte array. * Returns a byte array.
*/ */
numToVarInt: function(num) { exports.numToVarInt = function(num) {
var m = module.exports;
if (num < 253) return [num]; if (num < 253) return [num];
else if (num < 65536) return [253].concat(m.numToBytes(num,2)); if (num < 65536) return [253].concat(exports.numToBytes(num, 2));
else if (num < 4294967296) return [254].concat(m.numToBytes(num,4)); if (num < 4294967296) return [254].concat(exports.numToBytes(num, 4));
else return [253].concat(m.numToBytes(num,8)); return [253].concat(exports.numToBytes(num, 8));
}, }
bytesToWords: function (bytes) { exports.bytesToWords = function (bytes) {
var words = []; var words = [];
for (var i = 0, b = 0; i < bytes.length; i++, b += 8) { for (var i = 0, b = 0; i < bytes.length; i++, b += 8) {
words[b >>> 5] |= bytes[i] << (24 - b % 32); words[b >>> 5] |= bytes[i] << (24 - b % 32);
} }
return words; return words;
}, }
wordsToBytes: function (words) { exports.wordsToBytes = function (words) {
var bytes = []; var bytes = [];
for (var b = 0; b < words.length * 32; b += 8) { for (var b = 0; b < words.length * 32; b += 8) {
bytes.push((words[b >>> 5] >>> (24 - b % 32)) & 0xFF); bytes.push((words[b >>> 5] >>> (24 - b % 32)) & 0xFF);
@ -63,10 +60,10 @@ module.exports = {
* Takes an arbitrary byte array as inputs and returns the hash as a byte * Takes an arbitrary byte array as inputs and returns the hash as a byte
* array. * array.
*/ */
sha256ripe160: function (data) { exports.sha256ripe160 = function (data) {
return Crypto.RIPEMD160(Crypto.SHA256(data, {asBytes: true}), {asBytes: true}); return Crypto.RIPEMD160(Crypto.SHA256(data, {asBytes: true}), {asBytes: true});
}, }
error: function(msg) {
exports.error = function(msg) {
throw new Error(msg); throw new Error(msg);
} }
};