overleaf/services/web/frontend/js/shared/utils/md5.js

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/**
* Inspired by https://stackoverflow.com/a/60467595/237917
* A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
* Digest Algorithm, as defined in RFC 1321.
* Version 2.2 Copyright (C) Paul Johnston 1999 - 2009
* Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
* Distributed under the BSD License
* See http://pajhome.org.uk/crypt/md5 for more info.
*/
export function generateMD5Hash(inputString) {
const hc = '0123456789abcdef'
function rh(n) {
let j
let s = ''
for (j = 0; j <= 3; j++)
s +=
hc.charAt((n >> (j * 8 + 4)) & 0x0f) + hc.charAt((n >> (j * 8)) & 0x0f)
return s
}
function ad(x, y) {
const l = (x & 0xffff) + (y & 0xffff)
const m = (x >> 16) + (y >> 16) + (l >> 16)
return (m << 16) | (l & 0xffff)
}
function rl(n, c) {
return (n << c) | (n >>> (32 - c))
}
function cm(q, a, b, x, s, t) {
return ad(rl(ad(ad(a, q), ad(x, t)), s), b)
}
function ff(a, b, c, d, x, s, t) {
return cm((b & c) | (~b & d), a, b, x, s, t)
}
function gg(a, b, c, d, x, s, t) {
return cm((b & d) | (c & ~d), a, b, x, s, t)
}
function hh(a, b, c, d, x, s, t) {
return cm(b ^ c ^ d, a, b, x, s, t)
}
function ii(a, b, c, d, x, s, t) {
return cm(c ^ (b | ~d), a, b, x, s, t)
}
function sb(x) {
let i
const nblk = ((x.length + 8) >> 6) + 1
const blks = new Array(nblk * 16)
for (i = 0; i < nblk * 16; i++) blks[i] = 0
for (i = 0; i < x.length; i++)
blks[i >> 2] |= x.charCodeAt(i) << ((i % 4) * 8)
blks[i >> 2] |= 0x80 << ((i % 4) * 8)
blks[nblk * 16 - 2] = x.length * 8
return blks
}
let i
const x = sb('' + inputString)
let a = 1732584193
let b = -271733879
let c = -1732584194
let d = 271733878
let olda
let oldb
let oldc
let oldd
for (i = 0; i < x.length; i += 16) {
olda = a
oldb = b
oldc = c
oldd = d
a = ff(a, b, c, d, x[i + 0], 7, -680876936)
d = ff(d, a, b, c, x[i + 1], 12, -389564586)
c = ff(c, d, a, b, x[i + 2], 17, 606105819)
b = ff(b, c, d, a, x[i + 3], 22, -1044525330)
a = ff(a, b, c, d, x[i + 4], 7, -176418897)
d = ff(d, a, b, c, x[i + 5], 12, 1200080426)
c = ff(c, d, a, b, x[i + 6], 17, -1473231341)
b = ff(b, c, d, a, x[i + 7], 22, -45705983)
a = ff(a, b, c, d, x[i + 8], 7, 1770035416)
d = ff(d, a, b, c, x[i + 9], 12, -1958414417)
c = ff(c, d, a, b, x[i + 10], 17, -42063)
b = ff(b, c, d, a, x[i + 11], 22, -1990404162)
a = ff(a, b, c, d, x[i + 12], 7, 1804603682)
d = ff(d, a, b, c, x[i + 13], 12, -40341101)
c = ff(c, d, a, b, x[i + 14], 17, -1502002290)
b = ff(b, c, d, a, x[i + 15], 22, 1236535329)
a = gg(a, b, c, d, x[i + 1], 5, -165796510)
d = gg(d, a, b, c, x[i + 6], 9, -1069501632)
c = gg(c, d, a, b, x[i + 11], 14, 643717713)
b = gg(b, c, d, a, x[i + 0], 20, -373897302)
a = gg(a, b, c, d, x[i + 5], 5, -701558691)
d = gg(d, a, b, c, x[i + 10], 9, 38016083)
c = gg(c, d, a, b, x[i + 15], 14, -660478335)
b = gg(b, c, d, a, x[i + 4], 20, -405537848)
a = gg(a, b, c, d, x[i + 9], 5, 568446438)
d = gg(d, a, b, c, x[i + 14], 9, -1019803690)
c = gg(c, d, a, b, x[i + 3], 14, -187363961)
b = gg(b, c, d, a, x[i + 8], 20, 1163531501)
a = gg(a, b, c, d, x[i + 13], 5, -1444681467)
d = gg(d, a, b, c, x[i + 2], 9, -51403784)
c = gg(c, d, a, b, x[i + 7], 14, 1735328473)
b = gg(b, c, d, a, x[i + 12], 20, -1926607734)
a = hh(a, b, c, d, x[i + 5], 4, -378558)
d = hh(d, a, b, c, x[i + 8], 11, -2022574463)
c = hh(c, d, a, b, x[i + 11], 16, 1839030562)
b = hh(b, c, d, a, x[i + 14], 23, -35309556)
a = hh(a, b, c, d, x[i + 1], 4, -1530992060)
d = hh(d, a, b, c, x[i + 4], 11, 1272893353)
c = hh(c, d, a, b, x[i + 7], 16, -155497632)
b = hh(b, c, d, a, x[i + 10], 23, -1094730640)
a = hh(a, b, c, d, x[i + 13], 4, 681279174)
d = hh(d, a, b, c, x[i + 0], 11, -358537222)
c = hh(c, d, a, b, x[i + 3], 16, -722521979)
b = hh(b, c, d, a, x[i + 6], 23, 76029189)
a = hh(a, b, c, d, x[i + 9], 4, -640364487)
d = hh(d, a, b, c, x[i + 12], 11, -421815835)
c = hh(c, d, a, b, x[i + 15], 16, 530742520)
b = hh(b, c, d, a, x[i + 2], 23, -995338651)
a = ii(a, b, c, d, x[i + 0], 6, -198630844)
d = ii(d, a, b, c, x[i + 7], 10, 1126891415)
c = ii(c, d, a, b, x[i + 14], 15, -1416354905)
b = ii(b, c, d, a, x[i + 5], 21, -57434055)
a = ii(a, b, c, d, x[i + 12], 6, 1700485571)
d = ii(d, a, b, c, x[i + 3], 10, -1894986606)
c = ii(c, d, a, b, x[i + 10], 15, -1051523)
b = ii(b, c, d, a, x[i + 1], 21, -2054922799)
a = ii(a, b, c, d, x[i + 8], 6, 1873313359)
d = ii(d, a, b, c, x[i + 15], 10, -30611744)
c = ii(c, d, a, b, x[i + 6], 15, -1560198380)
b = ii(b, c, d, a, x[i + 13], 21, 1309151649)
a = ii(a, b, c, d, x[i + 4], 6, -145523070)
d = ii(d, a, b, c, x[i + 11], 10, -1120210379)
c = ii(c, d, a, b, x[i + 2], 15, 718787259)
b = ii(b, c, d, a, x[i + 9], 21, -343485551)
a = ad(a, olda)
b = ad(b, oldb)
c = ad(c, oldc)
d = ad(d, oldd)
}
return rh(a) + rh(b) + rh(c) + rh(d)
}