Kristaps Fabians Geikins
180 lines
5.0 KiB
JavaScript
180 lines
5.0 KiB
JavaScript
/**
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* Lightweight MD5 implementation.
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* @see http://www.myersdaily.org/joseph/javascript/md5-text.html
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*/
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function md5cycle(x, k) {
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let a = x[0],
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b = x[1],
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c = x[2],
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d = x[3]
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a = ff(a, b, c, d, k[0], 7, -680876936)
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d = ff(d, a, b, c, k[1], 12, -389564586)
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c = ff(c, d, a, b, k[2], 17, 606105819)
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b = ff(b, c, d, a, k[3], 22, -1044525330)
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a = ff(a, b, c, d, k[4], 7, -176418897)
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d = ff(d, a, b, c, k[5], 12, 1200080426)
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c = ff(c, d, a, b, k[6], 17, -1473231341)
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b = ff(b, c, d, a, k[7], 22, -45705983)
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a = ff(a, b, c, d, k[8], 7, 1770035416)
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d = ff(d, a, b, c, k[9], 12, -1958414417)
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c = ff(c, d, a, b, k[10], 17, -42063)
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b = ff(b, c, d, a, k[11], 22, -1990404162)
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a = ff(a, b, c, d, k[12], 7, 1804603682)
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d = ff(d, a, b, c, k[13], 12, -40341101)
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c = ff(c, d, a, b, k[14], 17, -1502002290)
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b = ff(b, c, d, a, k[15], 22, 1236535329)
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a = gg(a, b, c, d, k[1], 5, -165796510)
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d = gg(d, a, b, c, k[6], 9, -1069501632)
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c = gg(c, d, a, b, k[11], 14, 643717713)
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b = gg(b, c, d, a, k[0], 20, -373897302)
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a = gg(a, b, c, d, k[5], 5, -701558691)
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d = gg(d, a, b, c, k[10], 9, 38016083)
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c = gg(c, d, a, b, k[15], 14, -660478335)
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b = gg(b, c, d, a, k[4], 20, -405537848)
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a = gg(a, b, c, d, k[9], 5, 568446438)
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d = gg(d, a, b, c, k[14], 9, -1019803690)
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c = gg(c, d, a, b, k[3], 14, -187363961)
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b = gg(b, c, d, a, k[8], 20, 1163531501)
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a = gg(a, b, c, d, k[13], 5, -1444681467)
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d = gg(d, a, b, c, k[2], 9, -51403784)
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c = gg(c, d, a, b, k[7], 14, 1735328473)
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b = gg(b, c, d, a, k[12], 20, -1926607734)
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a = hh(a, b, c, d, k[5], 4, -378558)
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d = hh(d, a, b, c, k[8], 11, -2022574463)
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c = hh(c, d, a, b, k[11], 16, 1839030562)
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b = hh(b, c, d, a, k[14], 23, -35309556)
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a = hh(a, b, c, d, k[1], 4, -1530992060)
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d = hh(d, a, b, c, k[4], 11, 1272893353)
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c = hh(c, d, a, b, k[7], 16, -155497632)
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b = hh(b, c, d, a, k[10], 23, -1094730640)
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a = hh(a, b, c, d, k[13], 4, 681279174)
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d = hh(d, a, b, c, k[0], 11, -358537222)
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c = hh(c, d, a, b, k[3], 16, -722521979)
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b = hh(b, c, d, a, k[6], 23, 76029189)
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a = hh(a, b, c, d, k[9], 4, -640364487)
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d = hh(d, a, b, c, k[12], 11, -421815835)
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c = hh(c, d, a, b, k[15], 16, 530742520)
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b = hh(b, c, d, a, k[2], 23, -995338651)
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a = ii(a, b, c, d, k[0], 6, -198630844)
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d = ii(d, a, b, c, k[7], 10, 1126891415)
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c = ii(c, d, a, b, k[14], 15, -1416354905)
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b = ii(b, c, d, a, k[5], 21, -57434055)
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a = ii(a, b, c, d, k[12], 6, 1700485571)
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d = ii(d, a, b, c, k[3], 10, -1894986606)
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c = ii(c, d, a, b, k[10], 15, -1051523)
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b = ii(b, c, d, a, k[1], 21, -2054922799)
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a = ii(a, b, c, d, k[8], 6, 1873313359)
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d = ii(d, a, b, c, k[15], 10, -30611744)
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c = ii(c, d, a, b, k[6], 15, -1560198380)
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b = ii(b, c, d, a, k[13], 21, 1309151649)
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a = ii(a, b, c, d, k[4], 6, -145523070)
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d = ii(d, a, b, c, k[11], 10, -1120210379)
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c = ii(c, d, a, b, k[2], 15, 718787259)
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b = ii(b, c, d, a, k[9], 21, -343485551)
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x[0] = add32(a, x[0])
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x[1] = add32(b, x[1])
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x[2] = add32(c, x[2])
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x[3] = add32(d, x[3])
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}
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function cmn(q, a, b, x, s, t) {
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a = add32(add32(a, q), add32(x, t))
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return add32((a << s) | (a >>> (32 - s)), b)
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}
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function ff(a, b, c, d, x, s, t) {
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return cmn((b & c) | (~b & d), a, b, x, s, t)
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}
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function gg(a, b, c, d, x, s, t) {
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return cmn((b & d) | (c & ~d), a, b, x, s, t)
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}
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function hh(a, b, c, d, x, s, t) {
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return cmn(b ^ c ^ d, a, b, x, s, t)
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}
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function ii(a, b, c, d, x, s, t) {
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return cmn(c ^ (b | ~d), a, b, x, s, t)
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}
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function md51(s) {
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const n = s.length,
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state = [1732584193, -271733879, -1732584194, 271733878]
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let i
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for (i = 64; i <= s.length; i += 64) {
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md5cycle(state, md5blk(s.substring(i - 64, i)))
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}
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s = s.substring(i - 64)
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const tail = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
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for (i = 0; i < s.length; i++) tail[i >> 2] |= s.charCodeAt(i) << (i % 4 << 3)
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tail[i >> 2] |= 0x80 << (i % 4 << 3)
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if (i > 55) {
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md5cycle(state, tail)
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for (i = 0; i < 16; i++) tail[i] = 0
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}
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tail[14] = n * 8
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md5cycle(state, tail)
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return state
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}
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function md5blk(s) {
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/* I figured global was faster. */
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const md5blks = []
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let i
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for (i = 0; i < 64; i += 4) {
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md5blks[i >> 2] =
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s.charCodeAt(i) +
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(s.charCodeAt(i + 1) << 8) +
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(s.charCodeAt(i + 2) << 16) +
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(s.charCodeAt(i + 3) << 24)
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}
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return md5blks
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}
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const HEX_CHR = '0123456789abcdef'.split('')
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function rhex(n) {
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let s = '',
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j = 0
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for (; j < 4; j++)
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s += HEX_CHR[(n >> (j * 8 + 4)) & 0x0f] + HEX_CHR[(n >> (j * 8)) & 0x0f]
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return s
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}
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function hex(x) {
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for (let i = 0; i < x.length; i++) x[i] = rhex(x[i])
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return x.join('')
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}
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let add32 = (a, b) => {
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return (a + b) & 0xffffffff
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}
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/**
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* Generate an MD5 hash for an input string
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* @param {string} s input string
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* @returns {string} md5 hash
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*/
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function md5(s) {
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return hex(md51(s))
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}
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if (md5('hello') !== '5d41402abc4b2a76b9719d911017c592') {
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add32 = (x, y) => {
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const lsw = (x & 0xffff) + (y & 0xffff),
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msw = (x >> 16) + (y >> 16) + (lsw >> 16)
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return (msw << 16) | (lsw & 0xffff)
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}
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}
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export default md5
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export { md5 }
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