/* * HashCalculator.js (last update: 2021-08-15) * by Marc Robledo, https://www.marcrobledo.com * * data hash calculator (CRC32, MD5, SHA1, ADLER-32, CRC16) * * MIT License * * Copyright (c) 2016-2021 Marc Robledo * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ const HashCalculator = (function () { const HEX_CHR = '0123456789abcdef'.split(''); /* MD5 helpers */ const _add32 = function (a, b) { return (a + b) & 0xffffffff } const _md5cycle = function (x, k) { var a = x[0], b = x[1], c = x[2], d = x[3]; a = ff(a, b, c, d, k[0], 7, -680876936); d = ff(d, a, b, c, k[1], 12, -389564586); c = ff(c, d, a, b, k[2], 17, 606105819); b = ff(b, c, d, a, k[3], 22, -1044525330); a = ff(a, b, c, d, k[4], 7, -176418897); d = ff(d, a, b, c, k[5], 12, 1200080426); c = ff(c, d, a, b, k[6], 17, -1473231341); b = ff(b, c, d, a, k[7], 22, -45705983); a = ff(a, b, c, d, k[8], 7, 1770035416); d = ff(d, a, b, c, k[9], 12, -1958414417); c = ff(c, d, a, b, k[10], 17, -42063); b = ff(b, c, d, a, k[11], 22, -1990404162); a = ff(a, b, c, d, k[12], 7, 1804603682); d = ff(d, a, b, c, k[13], 12, -40341101); c = ff(c, d, a, b, k[14], 17, -1502002290); b = ff(b, c, d, a, k[15], 22, 1236535329); a = gg(a, b, c, d, k[1], 5, -165796510); d = gg(d, a, b, c, k[6], 9, -1069501632); c = gg(c, d, a, b, k[11], 14, 643717713); b = gg(b, c, d, a, k[0], 20, -373897302); a = gg(a, b, c, d, k[5], 5, -701558691); d = gg(d, a, b, c, k[10], 9, 38016083); c = gg(c, d, a, b, k[15], 14, -660478335); b = gg(b, c, d, a, k[4], 20, -405537848); a = gg(a, b, c, d, k[9], 5, 568446438); d = gg(d, a, b, c, k[14], 9, -1019803690); c = gg(c, d, a, b, k[3], 14, -187363961); b = gg(b, c, d, a, k[8], 20, 1163531501); a = gg(a, b, c, d, k[13], 5, -1444681467); d = gg(d, a, b, c, k[2], 9, -51403784); c = gg(c, d, a, b, k[7], 14, 1735328473); b = gg(b, c, d, a, k[12], 20, -1926607734); a = hh(a, b, c, d, k[5], 4, -378558); d = hh(d, a, b, c, k[8], 11, -2022574463); c = hh(c, d, a, b, k[11], 16, 1839030562); b = hh(b, c, d, a, k[14], 23, -35309556); a = hh(a, b, c, d, k[1], 4, -1530992060); d = hh(d, a, b, c, k[4], 11, 1272893353); c = hh(c, d, a, b, k[7], 16, -155497632); b = hh(b, c, d, a, k[10], 23, -1094730640); a = hh(a, b, c, d, k[13], 4, 681279174); d = hh(d, a, b, c, k[0], 11, -358537222); c = hh(c, d, a, b, k[3], 16, -722521979); b = hh(b, c, d, a, k[6], 23, 76029189); a = hh(a, b, c, d, k[9], 4, -640364487); d = hh(d, a, b, c, k[12], 11, -421815835); c = hh(c, d, a, b, k[15], 16, 530742520); b = hh(b, c, d, a, k[2], 23, -995338651); a = ii(a, b, c, d, k[0], 6, -198630844); d = ii(d, a, b, c, k[7], 10, 1126891415); c = ii(c, d, a, b, k[14], 15, -1416354905); b = ii(b, c, d, a, k[5], 21, -57434055); a = ii(a, b, c, d, k[12], 6, 1700485571); d = ii(d, a, b, c, k[3], 10, -1894986606); c = ii(c, d, a, b, k[10], 15, -1051523); b = ii(b, c, d, a, k[1], 21, -2054922799); a = ii(a, b, c, d, k[8], 6, 1873313359); d = ii(d, a, b, c, k[15], 10, -30611744); c = ii(c, d, a, b, k[6], 15, -1560198380); b = ii(b, c, d, a, k[13], 21, 1309151649); a = ii(a, b, c, d, k[4], 6, -145523070); d = ii(d, a, b, c, k[11], 10, -1120210379); c = ii(c, d, a, b, k[2], 15, 718787259); b = ii(b, c, d, a, k[9], 21, -343485551); x[0] = _add32(a, x[0]); x[1] = _add32(b, x[1]); x[2] = _add32(c, x[2]); x[3] = _add32(d, x[3]) } const _md5blk = function (d) { var md5blks = [], i; for (i = 0; i < 64; i += 4)md5blks[i >> 2] = d[i] + (d[i + 1] << 8) + (d[i + 2] << 16) + (d[i + 3] << 24); return md5blks } const _cmn = function (q, a, b, x, s, t) { a = _add32(_add32(a, q), _add32(x, t)); return _add32((a << s) | (a >>> (32 - s)), b) } const ff = function (a, b, c, d, x, s, t) { return _cmn((b & c) | ((~b) & d), a, b, x, s, t) } const gg = function (a, b, c, d, x, s, t) { return _cmn((b & d) | (c & (~d)), a, b, x, s, t) } const hh = function (a, b, c, d, x, s, t) { return _cmn(b ^ c ^ d, a, b, x, s, t) } const ii = function (a, b, c, d, x, s, t) { return _cmn(c ^ (b | (~d)), a, b, x, s, t) } /* CRC32 helpers */ const CRC32_TABLE = (function () { var c, crcTable = []; for (var n = 0; n < 256; n++) { c = n; for (var k = 0; k < 8; k++) c = ((c & 1) ? (0xedb88320 ^ (c >>> 1)) : (c >>> 1)); crcTable[n] = c; } return crcTable; }()); /* Adler-32 helpers */ const ADLER32_MOD = 0xfff1; const generateUint8Array = function (arrayBuffer, offset, len) { if (typeof offset !== 'number' || offset < 0) offset = 0; else if (offset < arrayBuffer.byteLength) offset = Math.floor(offset); else throw new Error('out of bounds slicing'); if (typeof len !== 'number' || len < 0 || (offset + len) >= arrayBuffer.byteLength.length) len = arrayBuffer.byteLength - offset; else if (len > 0) len = Math.floor(len); else throw new Error('zero length provided for slicing'); return new Uint8Array(arrayBuffer, offset, len); } return { /* SHA-1 using WebCryptoAPI */ sha1: async function sha1(arrayBuffer, offset, len) { if(typeof window === 'undefined' || typeof window.crypto === 'undefined') throw new Error('Web Crypto API is not available'); const u8array = generateUint8Array(arrayBuffer, offset, len); if (u8array.byteLength !== arrayBuffer.byteLength) { arrayBuffer = arrayBuffer.slice(u8array.byteOffset, u8array.byteOffset + u8array.byteLength); } const hash = await window.crypto.subtle.digest('SHA-1', arrayBuffer); const bytes = new Uint8Array(hash); let hexString = ''; for (let i = 0; i < bytes.length; i++) hexString += bytes[i] < 16 ? '0' + bytes[i].toString(16) : bytes[i].toString(16); return hexString; }, /* MD5 - from Joseph's Myers - http://www.myersdaily.org/joseph/javascript/md5.js */ md5: function (arrayBuffer, offset, len) { let u8array = generateUint8Array(arrayBuffer, offset, len); var n = u8array.byteLength, state = [1732584193, -271733879, -1732584194, 271733878], i; for (i = 64; i <= u8array.byteLength; i += 64) _md5cycle(state, _md5blk(u8array.slice(i - 64, i))); u8array = u8array.slice(i - 64); var tail = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]; for (i = 0; i < u8array.byteLength; i++) tail[i >> 2] |= u8array[i] << ((i % 4) << 3); tail[i >> 2] |= 0x80 << ((i % 4) << 3); if (i > 55) { _md5cycle(state, tail); for (i = 0; i < 16; i++)tail[i] = 0; } tail[14] = n * 8; tail[15] = Math.floor(n / 536870912) >>> 0; //if file is bigger than 512Mb*8, value is bigger than 32 bits, so it needs two words to store its length _md5cycle(state, tail); for (var i = 0; i < state.length; i++) { var s = '', j = 0; for (; j < 4; j++) s += HEX_CHR[(state[i] >> (j * 8 + 4)) & 0x0f] + HEX_CHR[(state[i] >> (j * 8)) & 0x0f]; state[i] = s; } return state.join('') }, /* CRC32 - from Alex - https://stackoverflow.com/a/18639999 */ crc32: function (arrayBuffer, offset, len) { const u8array = generateUint8Array(arrayBuffer, offset, len); var crc = 0 ^ (-1); for (var i = 0; i < u8array.byteLength; i++) crc = (crc >>> 8) ^ CRC32_TABLE[(crc ^ u8array[i]) & 0xff]; return ((crc ^ (-1)) >>> 0); }, /* Adler-32 - https://en.wikipedia.org/wiki/Adler-32#Example_implementation */ adler32: function (arrayBuffer, offset, len) { const u8array = generateUint8Array(arrayBuffer, offset, len); var a = 1, b = 0; for (var i = 0; i < u8array.byteLength; i++) { a = (a + u8array[i]) % ADLER32_MOD; b = (b + a) % ADLER32_MOD; } return ((b << 16) | a) >>> 0; }, /* CRC16/CCITT-FALSE */ crc16: function (arrayBuffer, offset, len) { const u8array = generateUint8Array(arrayBuffer, offset, len); var crc = 0xffff; var offset = 0; for (var i = 0; i < u8array.byteLength; i++) { crc ^= u8array[offset++] << 8; for (j = 0; j < 8; ++j) { crc = (crc & 0x8000) >>> 0 ? (crc << 1) ^ 0x1021 : crc << 1; } } return crc & 0xffff; } } }()); if (typeof module !== 'undefined' && module.exports) { module.exports = HashCalculator; }