mirror of
https://github.com/denoland/deno.git
synced 2024-12-26 00:59:24 -05:00
250 lines
8.3 KiB
TypeScript
250 lines
8.3 KiB
TypeScript
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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import * as hex from "../encoding/hex.ts";
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const TYPE_ERROR_MSG = "md5: `data` is invalid type";
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const BLOCK_SIZE = 64;
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export type Message = string | ArrayBuffer;
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/** Md5 hash */
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export class Md5 {
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#a: number;
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#b: number;
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#c: number;
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#d: number;
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#block: Uint8Array;
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#pos: number;
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#n0: number;
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#n1: number;
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constructor() {
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this.#a = 0x67452301;
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this.#b = 0xefcdab89;
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this.#c = 0x98badcfe;
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this.#d = 0x10325476;
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this.#block = new Uint8Array(BLOCK_SIZE);
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this.#pos = 0;
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this.#n0 = 0;
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this.#n1 = 0;
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}
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private addLength(len: number): void {
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let n0 = this.#n0;
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n0 += len;
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if (n0 > 0xffffffff) this.#n1 += 1;
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this.#n0 = n0 >>> 0;
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}
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private hash(block: Uint8Array): void {
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let a = this.#a;
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let b = this.#b;
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let c = this.#c;
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let d = this.#d;
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const blk = (i: number): number =>
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block[i] |
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(block[i + 1] << 8) |
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(block[i + 2] << 16) |
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(block[i + 3] << 24);
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const rol32 = (x: number, n: number): number => (x << n) | (x >>> (32 - n));
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const x0 = blk(0);
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const x1 = blk(4);
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const x2 = blk(8);
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const x3 = blk(12);
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const x4 = blk(16);
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const x5 = blk(20);
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const x6 = blk(24);
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const x7 = blk(28);
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const x8 = blk(32);
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const x9 = blk(36);
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const xa = blk(40);
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const xb = blk(44);
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const xc = blk(48);
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const xd = blk(52);
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const xe = blk(56);
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const xf = blk(60);
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// round 1
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a = b + rol32((((c ^ d) & b) ^ d) + a + x0 + 0xd76aa478, 7);
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d = a + rol32((((b ^ c) & a) ^ c) + d + x1 + 0xe8c7b756, 12);
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c = d + rol32((((a ^ b) & d) ^ b) + c + x2 + 0x242070db, 17);
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b = c + rol32((((d ^ a) & c) ^ a) + b + x3 + 0xc1bdceee, 22);
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a = b + rol32((((c ^ d) & b) ^ d) + a + x4 + 0xf57c0faf, 7);
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d = a + rol32((((b ^ c) & a) ^ c) + d + x5 + 0x4787c62a, 12);
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c = d + rol32((((a ^ b) & d) ^ b) + c + x6 + 0xa8304613, 17);
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b = c + rol32((((d ^ a) & c) ^ a) + b + x7 + 0xfd469501, 22);
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a = b + rol32((((c ^ d) & b) ^ d) + a + x8 + 0x698098d8, 7);
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d = a + rol32((((b ^ c) & a) ^ c) + d + x9 + 0x8b44f7af, 12);
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c = d + rol32((((a ^ b) & d) ^ b) + c + xa + 0xffff5bb1, 17);
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b = c + rol32((((d ^ a) & c) ^ a) + b + xb + 0x895cd7be, 22);
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a = b + rol32((((c ^ d) & b) ^ d) + a + xc + 0x6b901122, 7);
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d = a + rol32((((b ^ c) & a) ^ c) + d + xd + 0xfd987193, 12);
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c = d + rol32((((a ^ b) & d) ^ b) + c + xe + 0xa679438e, 17);
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b = c + rol32((((d ^ a) & c) ^ a) + b + xf + 0x49b40821, 22);
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// round 2
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a = b + rol32((((b ^ c) & d) ^ c) + a + x1 + 0xf61e2562, 5);
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d = a + rol32((((a ^ b) & c) ^ b) + d + x6 + 0xc040b340, 9);
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c = d + rol32((((d ^ a) & b) ^ a) + c + xb + 0x265e5a51, 14);
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b = c + rol32((((c ^ d) & a) ^ d) + b + x0 + 0xe9b6c7aa, 20);
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a = b + rol32((((b ^ c) & d) ^ c) + a + x5 + 0xd62f105d, 5);
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d = a + rol32((((a ^ b) & c) ^ b) + d + xa + 0x02441453, 9);
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c = d + rol32((((d ^ a) & b) ^ a) + c + xf + 0xd8a1e681, 14);
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b = c + rol32((((c ^ d) & a) ^ d) + b + x4 + 0xe7d3fbc8, 20);
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a = b + rol32((((b ^ c) & d) ^ c) + a + x9 + 0x21e1cde6, 5);
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d = a + rol32((((a ^ b) & c) ^ b) + d + xe + 0xc33707d6, 9);
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c = d + rol32((((d ^ a) & b) ^ a) + c + x3 + 0xf4d50d87, 14);
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b = c + rol32((((c ^ d) & a) ^ d) + b + x8 + 0x455a14ed, 20);
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a = b + rol32((((b ^ c) & d) ^ c) + a + xd + 0xa9e3e905, 5);
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d = a + rol32((((a ^ b) & c) ^ b) + d + x2 + 0xfcefa3f8, 9);
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c = d + rol32((((d ^ a) & b) ^ a) + c + x7 + 0x676f02d9, 14);
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b = c + rol32((((c ^ d) & a) ^ d) + b + xc + 0x8d2a4c8a, 20);
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// round 3
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a = b + rol32((b ^ c ^ d) + a + x5 + 0xfffa3942, 4);
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d = a + rol32((a ^ b ^ c) + d + x8 + 0x8771f681, 11);
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c = d + rol32((d ^ a ^ b) + c + xb + 0x6d9d6122, 16);
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b = c + rol32((c ^ d ^ a) + b + xe + 0xfde5380c, 23);
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a = b + rol32((b ^ c ^ d) + a + x1 + 0xa4beea44, 4);
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d = a + rol32((a ^ b ^ c) + d + x4 + 0x4bdecfa9, 11);
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c = d + rol32((d ^ a ^ b) + c + x7 + 0xf6bb4b60, 16);
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b = c + rol32((c ^ d ^ a) + b + xa + 0xbebfbc70, 23);
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a = b + rol32((b ^ c ^ d) + a + xd + 0x289b7ec6, 4);
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d = a + rol32((a ^ b ^ c) + d + x0 + 0xeaa127fa, 11);
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c = d + rol32((d ^ a ^ b) + c + x3 + 0xd4ef3085, 16);
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b = c + rol32((c ^ d ^ a) + b + x6 + 0x04881d05, 23);
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a = b + rol32((b ^ c ^ d) + a + x9 + 0xd9d4d039, 4);
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d = a + rol32((a ^ b ^ c) + d + xc + 0xe6db99e5, 11);
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c = d + rol32((d ^ a ^ b) + c + xf + 0x1fa27cf8, 16);
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b = c + rol32((c ^ d ^ a) + b + x2 + 0xc4ac5665, 23);
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// round 4
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a = b + rol32((c ^ (b | ~d)) + a + x0 + 0xf4292244, 6);
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d = a + rol32((b ^ (a | ~c)) + d + x7 + 0x432aff97, 10);
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c = d + rol32((a ^ (d | ~b)) + c + xe + 0xab9423a7, 15);
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b = c + rol32((d ^ (c | ~a)) + b + x5 + 0xfc93a039, 21);
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a = b + rol32((c ^ (b | ~d)) + a + xc + 0x655b59c3, 6);
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d = a + rol32((b ^ (a | ~c)) + d + x3 + 0x8f0ccc92, 10);
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c = d + rol32((a ^ (d | ~b)) + c + xa + 0xffeff47d, 15);
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b = c + rol32((d ^ (c | ~a)) + b + x1 + 0x85845dd1, 21);
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a = b + rol32((c ^ (b | ~d)) + a + x8 + 0x6fa87e4f, 6);
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d = a + rol32((b ^ (a | ~c)) + d + xf + 0xfe2ce6e0, 10);
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c = d + rol32((a ^ (d | ~b)) + c + x6 + 0xa3014314, 15);
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b = c + rol32((d ^ (c | ~a)) + b + xd + 0x4e0811a1, 21);
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a = b + rol32((c ^ (b | ~d)) + a + x4 + 0xf7537e82, 6);
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d = a + rol32((b ^ (a | ~c)) + d + xb + 0xbd3af235, 10);
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c = d + rol32((a ^ (d | ~b)) + c + x2 + 0x2ad7d2bb, 15);
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b = c + rol32((d ^ (c | ~a)) + b + x9 + 0xeb86d391, 21);
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this.#a = (this.#a + a) >>> 0;
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this.#b = (this.#b + b) >>> 0;
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this.#c = (this.#c + c) >>> 0;
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this.#d = (this.#d + d) >>> 0;
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}
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/**
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* Update internal state
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* @param data data to update, data cannot exceed 2^32 bytes
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*/
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update(data: Message): this {
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let msg: Uint8Array;
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if (typeof data === "string") {
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msg = new TextEncoder().encode(data as string);
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} else if (typeof data === "object") {
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if (data instanceof ArrayBuffer || ArrayBuffer.isView(data)) {
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msg = new Uint8Array(data);
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} else {
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throw new Error(TYPE_ERROR_MSG);
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}
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} else {
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throw new Error(TYPE_ERROR_MSG);
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}
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let pos = this.#pos;
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const free = BLOCK_SIZE - pos;
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if (msg.length < free) {
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this.#block.set(msg, pos);
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pos += msg.length;
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} else {
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// hash first block
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this.#block.set(msg.slice(0, free), pos);
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this.hash(this.#block);
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// hash as many blocks as possible
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let i = free;
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while (i + BLOCK_SIZE <= msg.length) {
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this.hash(msg.slice(i, i + BLOCK_SIZE));
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i += BLOCK_SIZE;
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}
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// store leftover
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this.#block.fill(0).set(msg.slice(i), 0);
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pos = msg.length - i;
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}
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this.#pos = pos;
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this.addLength(msg.length);
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return this;
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}
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/** Returns final hash */
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digest(): ArrayBuffer {
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let padLen = BLOCK_SIZE - this.#pos;
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if (padLen < 9) padLen += BLOCK_SIZE;
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const pad = new Uint8Array(padLen);
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pad[0] = 0x80;
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const n0 = this.#n0 << 3;
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const n1 = (this.#n1 << 3) | (this.#n0 >>> 29);
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pad[pad.length - 8] = n0 & 0xff;
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pad[pad.length - 7] = (n0 >>> 8) & 0xff;
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pad[pad.length - 6] = (n0 >>> 16) & 0xff;
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pad[pad.length - 5] = (n0 >>> 24) & 0xff;
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pad[pad.length - 4] = n1 & 0xff;
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pad[pad.length - 3] = (n1 >>> 8) & 0xff;
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pad[pad.length - 2] = (n1 >>> 16) & 0xff;
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pad[pad.length - 1] = (n1 >>> 24) & 0xff;
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this.update(pad.buffer);
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const hash = new ArrayBuffer(16);
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const hashView = new DataView(hash);
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hashView.setUint32(0, this.#a, true);
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hashView.setUint32(4, this.#b, true);
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hashView.setUint32(8, this.#c, true);
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hashView.setUint32(12, this.#d, true);
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return hash;
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}
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/**
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* Returns hash as a string of given format
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* @param format format of output string (hex or base64). Default is hex
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*/
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toString(format: "hex" | "base64" = "hex"): string {
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const hash = this.digest();
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switch (format) {
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case "hex":
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return hex.encodeToString(new Uint8Array(hash));
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case "base64": {
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const data = new Uint8Array(hash);
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let dataString = "";
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for (let i = 0; i < data.length; ++i) {
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dataString += String.fromCharCode(data[i]);
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}
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return btoa(dataString);
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}
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default:
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throw new Error("md5: invalid format");
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}
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}
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}
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