source ⟩ app ⟩ md5.js

// md5.js by Joseph Myers
// http://www.myersdaily.org/joseph/javascript/md5-text.html

function md5cycle(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]);
}

function cmn(q, a, b, x, s, t) {
	a = add32(add32(a, q), add32(x, t));
	return add32((a << s) | (a >>> (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) {
	var n = s.length,
		state = [1732584193, -271733879, -1732584194, 271733878],
		i;
	for (let i = 64; i <= s.length; i += 64) {
		md5cycle(state, md5blk(s.substring(i - 64, i)));
	}
	s = s.substring(i - 64);
	var tail = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
	for (let i = 0; i < s.length; i++)
		tail[i >> 2] |= s.charCodeAt(i) << (i % 4 << 3);
	tail[i >> 2] |= 0x80 << (i % 4 << 3);
	if (i > 55) {
		md5cycle(state, tail);
		for (let i = 0; i < 16; i++) tail[i] = 0;
	}
	tail[14] = n * 8;
	md5cycle(state, tail);
	return state;
}

/* there needs to be support for Unicode here,
 * unless we pretend that we can redefine the MD-5
 * algorithm for multi-byte characters (perhaps
 * by adding every four 16-bit characters and
 * shortening the sum to 32 bits). Otherwise
 * I suggest performing MD-5 as if every character
 * was two bytes--e.g., 0040 0025 = @%--but then
 * how will an ordinary MD-5 sum be matched?
 * There is no way to standardize text to something
 * like UTF-8 before transformation; speed cost is
 * utterly prohibitive. The JavaScript standard
 * itself needs to look at this: it should start
 * providing access to strings as preformed UTF-8
 * 8-bit unsigned value arrays.
 */
function md5blk(s) {
	/* I figured global was faster.   */
	var md5blks = [],
		i; /* Andy King said do it this way. */
	for (let i = 0; i < 64; i += 4) {
		md5blks[i >> 2] =
			s.charCodeAt(i) +
			(s.charCodeAt(i + 1) << 8) +
			(s.charCodeAt(i + 2) << 16) +
			(s.charCodeAt(i + 3) << 24);
	}
	return md5blks;
}

var hex_chr = "0123456789abcdef".split("");

function rhex(n) {
	var s = "",
		j = 0;
	for (; j < 4; j++)
		s +=
			hex_chr[(n >> (j * 8 + 4)) & 0x0f] + hex_chr[(n >> (j * 8)) & 0x0f];
	return s;
}

function hex(x) {
	for (let i = 0; i < x.length; i++) x[i] = rhex(x[i]);
	return x.join("");
}

function md5(s) {
	return hex(md51(s));
}

/* this function is much faster,
	so if possible we use it. Some IEs
	are the only ones I know of that
	need the idiotic second function,
	generated by an if clause.  */

function add32(a, b) {
	return (a + b) & 0xffffffff;
}

if (md5("hello") != "5d41402abc4b2a76b9719d911017c592") {
	function add32(x, y) {
		var lsw = (x & 0xffff) + (y & 0xffff),
			msw = (x >> 16) + (y >> 16) + (lsw >> 16);
		return (msw << 16) | (lsw & 0xffff);
	}
}

export default md5;