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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
import init, {
source,
create_hash as createHash,
update_hash as updateHash,
digest_hash as digestHash,
DenoHash,
} from "./wasm.js";
import * as hex from "../../encoding/hex.ts";
import * as base64 from "../../encoding/base64.ts";
import type { Hasher, Message, OutputFormat } from "../hasher.ts";
await init(source);
const TYPE_ERROR_MSG = "hash: `data` is invalid type";
export class Hash implements Hasher {
#hash: DenoHash;
#digested: boolean;
constructor(algorithm: string) {
this.#hash = createHash(algorithm);
this.#digested = false;
}
/**
* Update internal state
* @param data data to update
*/
update(data: Message): this {
let msg: Uint8Array;
if (typeof data === "string") {
msg = new TextEncoder().encode(data as string);
} else if (typeof data === "object") {
if (data instanceof ArrayBuffer || ArrayBuffer.isView(data)) {
msg = new Uint8Array(data);
} else {
throw new Error(TYPE_ERROR_MSG);
}
} else {
throw new Error(TYPE_ERROR_MSG);
}
updateHash(this.#hash, msg);
return this;
}
/** Returns final hash */
digest(): ArrayBuffer {
if (this.#digested) throw new Error("hash: already digested");
this.#digested = true;
return digestHash(this.#hash);
}
/**
* Returns hash as a string of given format
* @param format format of output string (hex or base64). Default is hex
*/
toString(format: OutputFormat = "hex"): string {
const finalized = new Uint8Array(this.digest());
switch (format) {
case "hex":
return hex.encodeToString(finalized);
case "base64":
return base64.encode(finalized);
default:
throw new Error("hash: invalid format");
}
}
}
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