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dingoskydingosky
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Include dist, but not lib
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6 files changed

+328
-20
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6 files changed

+328
-20
lines changed

‎.gitignore

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node_modules
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dist
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*~
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.DS_Store

‎.npmignore

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lib
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test
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*~
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.idea
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*.iml
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npm-debug.log
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dump.rdb
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node_modules
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results.tap
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results.xml
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npm-shrinkwrap.json
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config.json
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.DS_Store
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*/.DS_Store
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*/*/.DS_Store
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._*
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*/._*
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*/*/._*
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coverage.*
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lib-cov
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‎dist/lib/charSet.js

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'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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var _log = require('babel-runtime/core-js/math/log2');
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var _log2 = _interopRequireDefault(_log);
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var _classCallCheck2 = require('babel-runtime/helpers/classCallCheck');
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var _classCallCheck3 = _interopRequireDefault(_classCallCheck2);
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var _createClass2 = require('babel-runtime/helpers/createClass');
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var _createClass3 = _interopRequireDefault(_createClass2);
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var _lcm = require('./lcm');
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var _lcm2 = _interopRequireDefault(_lcm);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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var CharSet = function () {
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function CharSet(chars) {
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(0, _classCallCheck3.default)(this, CharSet);
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this.chars = chars;
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this.len = chars.length;
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this.entropyPerChar = Math.floor((0, _log2.default)(this.len));
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if (this.entropyPerChar != (0, _log2.default)(this.len)) {
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throw new Error('EntropyString only supports CharSets with a power of 2 characters');
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}
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this.charsPerChunk = (0, _lcm2.default)(this.entropyPerChar, 8) / this.entropyPerChar;
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}
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(0, _createClass3.default)(CharSet, [{
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key: 'use',
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value: function use(chars) {
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var len = chars.length;
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// Ensure correct number of characters
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if (len != this.len) {
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throw new Error('Invalid character count');
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}
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// Ensure no repeated characters
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for (var i = 0; i < len; i++) {
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var c = chars.charAt(i);
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for (var j = i + 1; j < len; j++) {
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if (c === chars.charAt(j)) {
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throw new Error('Characters not unique');
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}
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}
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}
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this.chars = chars;
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}
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}]);
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return CharSet;
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}();
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var charSet64 = new CharSet("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_");
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var charSet32 = new CharSet("2346789bdfghjmnpqrtBDFGHJLMNPQRT");
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var charSet16 = new CharSet("0123456789abcdef");
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var charSet8 = new CharSet("01234567");
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var charSet4 = new CharSet("ATCG");
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var charSet2 = new CharSet("01");
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var isValid = function isValid(charSet) {
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return charSet instanceof CharSet;
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};
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exports.default = {
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charSet64: charSet64,
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charSet32: charSet32,
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charSet16: charSet16,
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charSet8: charSet8,
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charSet4: charSet4,
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charSet2: charSet2,
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isValid: isValid
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};

‎dist/lib/entropy.js

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'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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var _log = require('babel-runtime/core-js/math/log10');
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var _log2 = _interopRequireDefault(_log);
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var _log3 = require('babel-runtime/core-js/math/log2');
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var _log4 = _interopRequireDefault(_log3);
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var _charSet = require('./charSet');
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var _charSet2 = _interopRequireDefault(_charSet);
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var _lcm = require('./lcm');
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var _lcm2 = _interopRequireDefault(_lcm);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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var crypto = require('crypto');
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var log2 = _log4.default;
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var log10 = _log2.default;
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var log2_10 = log2(10);
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var bits = function bits(total, risk) {
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if (total == 0) {
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return 0;
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}
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var N = 0;
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if (total < 10001) {
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N = log2(total) + log2(total - 1) + log2_10 * log10(risk) - 1;
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} else {
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var n = 2 * log10(total) + log10(risk);
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N = n * log2_10 - 1;
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}
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return N;
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};
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var bitsWithRiskPower = function bitsWithRiskPower(total, rPower) {
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if (total == 0) {
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return 0;
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}
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var N = 0;
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if (total < 10001) {
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N = log2(total) + log2(total - 1) + log2_10 * rPower - 1;
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} else {
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var n = 2 * log10(total) + rPower;
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N = n * log2_10 - 1;
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}
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return N;
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};
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var bitsWithPowers = function bitsWithPowers(tPower, rPower) {
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var N = 0;
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if (tPower < 5) {
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return bitsWithRiskPower(Math.pow(10, tPower), rPower);
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} else {
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var n = 2 * tPower + rPower;
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N = n * log2_10 - 1;
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}
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return N;
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};
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var randomString = function randomString(bits, charSet) {
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if (!_charSet2.default.isValid(charSet)) {
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throw new Error('Invalid CharSet');
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}
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var count = Math.ceil(bits / charSet.entropyPerChar);
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if (count <= 0) {
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return '';
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}
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var bytes = randomBytes(count, charSet);
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return randomStringWithBytes(bits, charSet, bytes);
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};
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var randomStringWithBytes = function randomStringWithBytes(bits, charSet, bytes) {
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if (!_charSet2.default.isValid(charSet)) {
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console.log('WTF?');
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throw new Error('Invalid CharSet');
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}
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if (bits <= 0) {
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return '';
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}
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var count = Math.ceil(bits / charSet.entropyPerChar);
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if (count <= 0) {
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return '';
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}
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var needed = Math.ceil(count * (charSet.entropyPerChar / 8));
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if (bytes.length < needed) {
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throw new Error('Insufficient bytes');
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}
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var chunks = Math.floor(count / charSet.charsPerChunk);
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var partials = count % charSet.charsPerChunk;
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var chars = void 0,
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ndxFn = void 0;
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switch (charSet) {
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case _charSet2.default.charSet64:
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chars = _charSet2.default.charSet64.chars;
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ndxFn = ndx64;
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break;
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case _charSet2.default.charSet32:
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chars = _charSet2.default.charSet32.chars;
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ndxFn = ndx32;
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break;
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case _charSet2.default.charSet16:
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chars = _charSet2.default.charSet16.chars;
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ndxFn = ndx16;
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break;
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case _charSet2.default.charSet8:
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chars = _charSet2.default.charSet8.chars;
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ndxFn = ndx8;
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break;
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case _charSet2.default.charSet4:
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chars = _charSet2.default.charSet4.chars;
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ndxFn = ndx4;
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break;
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case _charSet2.default.charSet2:
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chars = _charSet2.default.charSet2.chars;
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ndxFn = ndx2;
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break;
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default:
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break;
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}
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var string = '';
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for (var chunk = 0; chunk < chunks; chunk++) {
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for (var slice = 0; slice < charSet.charsPerChunk; slice++) {
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var ndx = ndxFn(chunk, slice, bytes);
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string += chars[ndx];
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}
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}
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for (var _slice = 0; _slice < partials; _slice++) {
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var _ndx = ndxFn(chunks, _slice, bytes);
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string += chars[_ndx];
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}
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return string;
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};
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var randomBytes = function randomBytes(count, charSet) {
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var bytesPerSlice = charSet.entropyPerChar / 8;
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var bytesNeeded = Math.ceil(count * bytesPerSlice);
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return Buffer.from(crypto.randomBytes(bytesNeeded));
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};
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var ndx64 = function ndx64(chunk, slice, bytes) {
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return ndxGen(chunk, slice, bytes, 6);
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};
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var ndx32 = function ndx32(chunk, slice, bytes) {
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return ndxGen(chunk, slice, bytes, 5);
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};
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var ndx16 = function ndx16(chunk, slice, bytes) {
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return (bytes[chunk] << 4 * slice & 0xff) >> 4;
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};
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var ndx8 = function ndx8(chunk, slice, bytes) {
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return ndxGen(chunk, slice, bytes, 3);
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};
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var ndx4 = function ndx4(chunk, slice, bytes) {
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return (bytes[chunk] << 2 * slice & 0xff) >> 6;
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};
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var ndx2 = function ndx2(chunk, slice, bytes) {
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return (bytes[chunk] << slice & 0xff) >> 7;
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};
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var ndxGen = function ndxGen(chunk, slice, bytes, bitsPerSlice) {
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var bitsPerByte = 8;
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var slicesPerChunk = (0, _lcm2.default)(bitsPerSlice, bitsPerByte) / bitsPerByte;
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var bNum = chunk * slicesPerChunk;
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var rShift = bitsPerByte - bitsPerSlice;
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var lOffset = Math.floor(slice * bitsPerSlice / bitsPerByte);
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var lShift = slice * bitsPerSlice % bitsPerByte;
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var ndx = (bytes[bNum + lOffset] << lShift & 0xff) >> rShift;
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var rOffset = Math.ceil(slice * bitsPerSlice / bitsPerByte);
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var rShiftIt = ((rOffset + 1) * bitsPerByte - (slice + 1) * bitsPerSlice) % bitsPerByte;
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if (rShift < rShiftIt) {
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ndx += bytes[bNum + rOffset] >> rShiftIt;
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}
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return ndx;
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};
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exports.default = {
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bits: bits,
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bitsWithRiskPower: bitsWithRiskPower,
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bitsWithPowers: bitsWithPowers,
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randomString: randomString,
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randomStringWithBytes: randomStringWithBytes,
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charSet64: _charSet2.default.charSet64,
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charSet32: _charSet2.default.charSet32,
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charSet16: _charSet2.default.charSet16,
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charSet8: _charSet2.default.charSet8,
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charSet4: _charSet2.default.charSet4,
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charSet2: _charSet2.default.charSet2
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};

‎dist/lib/lcm.js

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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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var gcd = function gcd(a, b) {
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while (b != 0) {
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var h = a;
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a = b;
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b = h % b;
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// (a, b) = (b, a % b)
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}
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return Math.abs(a);
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};
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// const lcm = (a, b) => {
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// return (a / gcd(a, b)) * b
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// }
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exports.default = function (a, b) {
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return a / gcd(a, b) * b;
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};

‎package.json

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{
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"name": "entropy-string",
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"version": "1.0.4",
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"version": "1.0.5",
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"description": "Efficiently generate cryptographically strong random strings of specified entropy from various character sets.",
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"main": "entropy-string.js",
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"directories": {

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