index.js•1.24 kB
'use strict';
var utilBufferFrom = require('@smithy/util-buffer-from');
var utilUtf8 = require('@smithy/util-utf8');
var buffer = require('buffer');
var crypto = require('crypto');
class Hash {
algorithmIdentifier;
secret;
hash;
constructor(algorithmIdentifier, secret) {
this.algorithmIdentifier = algorithmIdentifier;
this.secret = secret;
this.reset();
}
update(toHash, encoding) {
this.hash.update(utilUtf8.toUint8Array(castSourceData(toHash, encoding)));
}
digest() {
return Promise.resolve(this.hash.digest());
}
reset() {
this.hash = this.secret
? crypto.createHmac(this.algorithmIdentifier, castSourceData(this.secret))
: crypto.createHash(this.algorithmIdentifier);
}
}
function castSourceData(toCast, encoding) {
if (buffer.Buffer.isBuffer(toCast)) {
return toCast;
}
if (typeof toCast === "string") {
return utilBufferFrom.fromString(toCast, encoding);
}
if (ArrayBuffer.isView(toCast)) {
return utilBufferFrom.fromArrayBuffer(toCast.buffer, toCast.byteOffset, toCast.byteLength);
}
return utilBufferFrom.fromArrayBuffer(toCast);
}
exports.Hash = Hash;