123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195
import { HashAlgorithm } from "./hash.ts";
/* * Add integers, wrapping at 2^32. This uses 16-bit operations internally * to work around bugs in some JS interpreters. */function safeAdd(x: number, y: number): number {  const lsw = (x & 0xffff) + (y & 0xffff);  const msw = (x >> 16) + (y >> 16) + (lsw >> 16);  return (msw << 16) | (lsw & 0xffff);}
/* * Bitwise rotate a 32-bit number to the left. */function bitRotateLeft(num: number, cnt: number): number {  return (num << cnt) | (num >>> (32 - cnt));}
/* * These functions implement the four basic operations the algorithm uses. */function md5cmn(  q: number,  a: number,  b: number,  x: number,  s: number,  t: number,): number {  return safeAdd(bitRotateLeft(safeAdd(safeAdd(a, q), safeAdd(x, t)), s), b);}function md5ff(  a: number,  b: number,  c: number,  d: number,  x: number,  s: number,  t: number,) {  return md5cmn((b & c) | (~b & d), a, b, x, s, t);}function md5gg(  a: number,  b: number,  c: number,  d: number,  x: number,  s: number,  t: number,): number {  return md5cmn((b & d) | (c & ~d), a, b, x, s, t);}function md5hh(  a: number,  b: number,  c: number,  d: number,  x: number,  s: number,  t: number,): number {  return md5cmn(b ^ c ^ d, a, b, x, s, t);}function md5ii(  a: number,  b: number,  c: number,  d: number,  x: number,  s: number,  t: number,): number {  return md5cmn(c ^ (b | ~d), a, b, x, s, t);}
/* * Calculate the MD5 of an array of little-endian words, and a bit length. */function binlMD5(x: number[], len: number): number[] {  /* append padding */  x[len >> 5] |= 0x80 << len % 32;  x[(((len + 64) >>> 9) << 4) + 14] = len;
  let olda: number, oldb: number, oldc: number, oldd: number;  let a = 1732584193,    b = -271733879,    c = -1732584194,    d = 271733878;
  for (let i = 0; i < x.length; i += 16) {    olda = a;    oldb = b;    oldc = c;    oldd = d;
    a = md5ff(a, b, c, d, x[i], 7, -680876936);    d = md5ff(d, a, b, c, x[i + 1], 12, -389564586);    c = md5ff(c, d, a, b, x[i + 2], 17, 606105819);    b = md5ff(b, c, d, a, x[i + 3], 22, -1044525330);    a = md5ff(a, b, c, d, x[i + 4], 7, -176418897);    d = md5ff(d, a, b, c, x[i + 5], 12, 1200080426);    c = md5ff(c, d, a, b, x[i + 6], 17, -1473231341);    b = md5ff(b, c, d, a, x[i + 7], 22, -45705983);    a = md5ff(a, b, c, d, x[i + 8], 7, 1770035416);    d = md5ff(d, a, b, c, x[i + 9], 12, -1958414417);    c = md5ff(c, d, a, b, x[i + 10], 17, -42063);    b = md5ff(b, c, d, a, x[i + 11], 22, -1990404162);    a = md5ff(a, b, c, d, x[i + 12], 7, 1804603682);    d = md5ff(d, a, b, c, x[i + 13], 12, -40341101);    c = md5ff(c, d, a, b, x[i + 14], 17, -1502002290);    b = md5ff(b, c, d, a, x[i + 15], 22, 1236535329);
    a = md5gg(a, b, c, d, x[i + 1], 5, -165796510);    d = md5gg(d, a, b, c, x[i + 6], 9, -1069501632);    c = md5gg(c, d, a, b, x[i + 11], 14, 643717713);    b = md5gg(b, c, d, a, x[i], 20, -373897302);    a = md5gg(a, b, c, d, x[i + 5], 5, -701558691);    d = md5gg(d, a, b, c, x[i + 10], 9, 38016083);    c = md5gg(c, d, a, b, x[i + 15], 14, -660478335);    b = md5gg(b, c, d, a, x[i + 4], 20, -405537848);    a = md5gg(a, b, c, d, x[i + 9], 5, 568446438);    d = md5gg(d, a, b, c, x[i + 14], 9, -1019803690);    c = md5gg(c, d, a, b, x[i + 3], 14, -187363961);    b = md5gg(b, c, d, a, x[i + 8], 20, 1163531501);    a = md5gg(a, b, c, d, x[i + 13], 5, -1444681467);    d = md5gg(d, a, b, c, x[i + 2], 9, -51403784);    c = md5gg(c, d, a, b, x[i + 7], 14, 1735328473);    b = md5gg(b, c, d, a, x[i + 12], 20, -1926607734);
    a = md5hh(a, b, c, d, x[i + 5], 4, -378558);    d = md5hh(d, a, b, c, x[i + 8], 11, -2022574463);    c = md5hh(c, d, a, b, x[i + 11], 16, 1839030562);    b = md5hh(b, c, d, a, x[i + 14], 23, -35309556);    a = md5hh(a, b, c, d, x[i + 1], 4, -1530992060);    d = md5hh(d, a, b, c, x[i + 4], 11, 1272893353);    c = md5hh(c, d, a, b, x[i + 7], 16, -155497632);    b = md5hh(b, c, d, a, x[i + 10], 23, -1094730640);    a = md5hh(a, b, c, d, x[i + 13], 4, 681279174);    d = md5hh(d, a, b, c, x[i], 11, -358537222);    c = md5hh(c, d, a, b, x[i + 3], 16, -722521979);    b = md5hh(b, c, d, a, x[i + 6], 23, 76029189);    a = md5hh(a, b, c, d, x[i + 9], 4, -640364487);    d = md5hh(d, a, b, c, x[i + 12], 11, -421815835);    c = md5hh(c, d, a, b, x[i + 15], 16, 530742520);    b = md5hh(b, c, d, a, x[i + 2], 23, -995338651);
    a = md5ii(a, b, c, d, x[i], 6, -198630844);    d = md5ii(d, a, b, c, x[i + 7], 10, 1126891415);    c = md5ii(c, d, a, b, x[i + 14], 15, -1416354905);    b = md5ii(b, c, d, a, x[i + 5], 21, -57434055);    a = md5ii(a, b, c, d, x[i + 12], 6, 1700485571);    d = md5ii(d, a, b, c, x[i + 3], 10, -1894986606);    c = md5ii(c, d, a, b, x[i + 10], 15, -1051523);    b = md5ii(b, c, d, a, x[i + 1], 21, -2054922799);    a = md5ii(a, b, c, d, x[i + 8], 6, 1873313359);    d = md5ii(d, a, b, c, x[i + 15], 10, -30611744);    c = md5ii(c, d, a, b, x[i + 6], 15, -1560198380);    b = md5ii(b, c, d, a, x[i + 13], 21, 1309151649);    a = md5ii(a, b, c, d, x[i + 4], 6, -145523070);    d = md5ii(d, a, b, c, x[i + 11], 10, -1120210379);    c = md5ii(c, d, a, b, x[i + 2], 15, 718787259);    b = md5ii(b, c, d, a, x[i + 9], 21, -343485551);
    a = safeAdd(a, olda);    b = safeAdd(b, oldb);    c = safeAdd(c, oldc);    d = safeAdd(d, oldd);  }  return [a, b, c, d];}
function md5(bytes: Uint8Array): number[] {  let data: number[] = [];  var length8 = bytes.length * 8;  for (let i = 0; i < length8; i += 8) {    data[i >> 5] |= (bytes[i / 8] & 0xff) << i % 32;  }  return binlMD5(data, bytes.length * 8);}
export class Md5Hash implements HashAlgorithm {  digest(bytes: Uint8Array): Uint8Array {    const data = md5(bytes);    return this.toStrBytes(data);  }
  private toStrBytes(input: number[]): Uint8Array {    const buffer = new ArrayBuffer(16);    new Uint32Array(buffer).set(input);    return new Uint8Array(buffer);  }}