34 lines
1.1 KiB
JavaScript
34 lines
1.1 KiB
JavaScript
import { fromArrayBuffer, fromString } from "@smithy/util-buffer-from";
|
|
import { toUint8Array } from "@smithy/util-utf8";
|
|
import { Buffer } from "buffer";
|
|
import { createHash, createHmac } from "crypto";
|
|
export class Hash {
|
|
constructor(algorithmIdentifier, secret) {
|
|
this.algorithmIdentifier = algorithmIdentifier;
|
|
this.secret = secret;
|
|
this.reset();
|
|
}
|
|
update(toHash, encoding) {
|
|
this.hash.update(toUint8Array(castSourceData(toHash, encoding)));
|
|
}
|
|
digest() {
|
|
return Promise.resolve(this.hash.digest());
|
|
}
|
|
reset() {
|
|
this.hash = this.secret
|
|
? createHmac(this.algorithmIdentifier, castSourceData(this.secret))
|
|
: createHash(this.algorithmIdentifier);
|
|
}
|
|
}
|
|
function castSourceData(toCast, encoding) {
|
|
if (Buffer.isBuffer(toCast)) {
|
|
return toCast;
|
|
}
|
|
if (typeof toCast === "string") {
|
|
return fromString(toCast, encoding);
|
|
}
|
|
if (ArrayBuffer.isView(toCast)) {
|
|
return fromArrayBuffer(toCast.buffer, toCast.byteOffset, toCast.byteLength);
|
|
}
|
|
return fromArrayBuffer(toCast);
|
|
}
|