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