80 lines
8.1 KiB
JavaScript
80 lines
8.1 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.Sha256 = void 0;
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var tslib_1 = require("tslib");
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var constants_1 = require("./constants");
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var RawSha256_1 = require("./RawSha256");
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var util_1 = require("@aws-crypto/util");
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var Sha256 = /** @class */ (function () {
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function Sha256(secret) {
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this.hash = new RawSha256_1.RawSha256();
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if (secret) {
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this.outer = new RawSha256_1.RawSha256();
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var inner = bufferFromSecret(secret);
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var outer = new Uint8Array(constants_1.BLOCK_SIZE);
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outer.set(inner);
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for (var i = 0; i < constants_1.BLOCK_SIZE; i++) {
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inner[i] ^= 0x36;
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outer[i] ^= 0x5c;
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}
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this.hash.update(inner);
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this.outer.update(outer);
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// overwrite the copied key in memory
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for (var i = 0; i < inner.byteLength; i++) {
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inner[i] = 0;
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}
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}
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}
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Sha256.prototype.update = function (toHash) {
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if ((0, util_1.isEmptyData)(toHash) || this.error) {
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return;
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}
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try {
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this.hash.update((0, util_1.convertToBuffer)(toHash));
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}
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catch (e) {
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this.error = e;
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}
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};
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/* This synchronous method keeps compatibility
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* with the v2 aws-sdk.
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*/
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Sha256.prototype.digestSync = function () {
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if (this.error) {
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throw this.error;
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}
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if (this.outer) {
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if (!this.outer.finished) {
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this.outer.update(this.hash.digest());
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}
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return this.outer.digest();
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}
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return this.hash.digest();
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};
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/* The underlying digest method here is synchronous.
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* To keep the same interface with the other hash functions
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* the default is to expose this as an async method.
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* However, it can sometimes be useful to have a sync method.
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*/
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Sha256.prototype.digest = function () {
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return (0, tslib_1.__awaiter)(this, void 0, void 0, function () {
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return (0, tslib_1.__generator)(this, function (_a) {
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return [2 /*return*/, this.digestSync()];
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});
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});
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};
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return Sha256;
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}());
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exports.Sha256 = Sha256;
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function bufferFromSecret(secret) {
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var input = (0, util_1.convertToBuffer)(secret);
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if (input.byteLength > constants_1.BLOCK_SIZE) {
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var bufferHash = new RawSha256_1.RawSha256();
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bufferHash.update(input);
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input = bufferHash.digest();
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}
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var buffer = new Uint8Array(constants_1.BLOCK_SIZE);
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buffer.set(input);
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return buffer;
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}
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