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36 lines
1.0 KiB
36 lines
1.0 KiB
import { inherits as inherits$0 } from "util";
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import Base from "../cipher-base";
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'use strict';
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var inherits = { inherits: inherits$0 }.inherits;
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var ZEROS = Buffer.alloc(128);
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var blocksize = 64;
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function Hmac(alg, key) {
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Base.call(this, 'digest');
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if (typeof key === 'string') {
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key = Buffer.from(key);
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}
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this._alg = alg;
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this._key = key;
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if (key.length > blocksize) {
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key = alg(key);
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}
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else if (key.length < blocksize) {
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key = Buffer.concat([key, ZEROS], blocksize);
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}
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var ipad = this._ipad = Buffer.allocUnsafe(blocksize);
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var opad = this._opad = Buffer.allocUnsafe(blocksize);
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for (var i = 0; i < blocksize; i++) {
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ipad[i] = key[i] ^ 0x36;
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opad[i] = key[i] ^ 0x5C;
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}
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this._hash = [ipad];
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}
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inherits(Hmac, Base);
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Hmac.prototype._update = function (data) {
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this._hash.push(data);
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};
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Hmac.prototype._final = function () {
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var h = this._alg(Buffer.concat(this._hash));
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return this._alg(Buffer.concat([this._opad, h]));
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};
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export default Hmac;
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