ref: 81d1e4e01d7001e6a0107792e6167136787295d6
dir: /md5.js/
// adapted from <https://stackoverflow.com/a/14733423>
function md5cycle(x, k)
{
let a = x[0]
let b = x[1]
let c = x[2]
let 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] += a
x[1] += b
x[2] += c
x[3] += d
}
function cmn(q, a, b, x, s, t)
{
let c = add32(add32(a, q), add32(x, t))
return add32((c << s) | (c >>> (32 - s)), b)
}
function ff(a, b, c, d, x, s, t)
{
return cmn((b & c) | ((~b) & d), a, b, x, s, t)
}
function gg(a, b, c, d, x, s, t)
{
return cmn((b & d) | (c & (~d)), a, b, x, s, t)
}
function hh(a, b, c, d, x, s, t)
{
return cmn(b ^ c ^ d, a, b, x, s, t)
}
function ii(a, b, c, d, x, s, t)
{
return cmn(c ^ (b | (~d)), a, b, x, s, t)
}
function md51(s)
{
let n = s.length
let state = new Uint32Array([1732584193, -271733879, -1732584194, 271733878])
let i
for (i = 64 ; i <= s.length ; i += 64) md5cycle(state, new Uint32Array(s.buffer, s.byteOffset + i - 64, 16))
s = s.subarray(i - 64)
let tail = new Uint32Array(16)
for (i = 0 ; i < s.length ; i++) tail[i >> 2] |= s[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
md5cycle(state, tail)
return state
}
function add32(a, b)
{
return (a + b) & 0xFFFFFFFF
}
export function MD5(buffer)
{
let view = new DataView(md51(buffer).buffer)
return Array(4).fill().map((n, i) => view.getUint32(i * 4).toString(16).padStart(8, "0")).join("")
}