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https://github.com/denoland/deno.git
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76 lines
1.8 KiB
TypeScript
76 lines
1.8 KiB
TypeScript
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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import init, {
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source,
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create_hash as createHash,
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update_hash as updateHash,
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digest_hash as digestHash,
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DenoHash,
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} from "./wasm.js";
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import * as hex from "../../encoding/hex.ts";
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import * as base64 from "../../encoding/base64.ts";
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import { Hasher, Message, OutputFormat } from "../hasher.ts";
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await init(source);
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const TYPE_ERROR_MSG = "hash: `data` is invalid type";
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export class Hash implements Hasher {
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#hash: DenoHash;
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#digested: boolean;
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constructor(algorithm: string) {
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this.#hash = createHash(algorithm);
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this.#digested = false;
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}
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/**
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* Update internal state
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* @param data data to update
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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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updateHash(this.#hash, msg);
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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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if (this.#digested) throw new Error("hash: already digested");
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this.#digested = true;
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return digestHash(this.#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: OutputFormat = "hex"): string {
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const finalized = new Uint8Array(this.digest());
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switch (format) {
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case "hex":
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return hex.encodeToString(finalized);
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case "base64":
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return base64.encode(finalized);
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default:
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throw new Error("hash: invalid format");
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}
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}
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}
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