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Viewing file:     jsSha256.js (2.79 KB)      -rw-r--r--

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Sha256 = void 0;
var tslib_1 = require("tslib");
var constants_1 = require("./constants");
var RawSha256_1 = require("./RawSha256");
var util_1 = require("@aws-crypto/util");
var Sha256 = /** @class */ (function () {
    function Sha256(secret) {
        this.secret = secret;
        this.hash = new RawSha256_1.RawSha256();
        this.reset();
    }
    Sha256.prototype.update = function (toHash) {
        if ((0, util_1.isEmptyData)(toHash) || this.error) {
            return;
        }
        try {
            this.hash.update((0, util_1.convertToBuffer)(toHash));
        }
        catch (e) {
            this.error = e;
        }
    };
    /* This synchronous method keeps compatibility
     * with the v2 aws-sdk.
     */
    Sha256.prototype.digestSync = function () {
        if (this.error) {
            throw this.error;
        }
        if (this.outer) {
            if (!this.outer.finished) {
                this.outer.update(this.hash.digest());
            }
            return this.outer.digest();
        }
        return this.hash.digest();
    };
    /* The underlying digest method here is synchronous.
     * To keep the same interface with the other hash functions
     * the default is to expose this as an async method.
     * However, it can sometimes be useful to have a sync method.
     */
    Sha256.prototype.digest = function () {
        return tslib_1.__awaiter(this, void 0, void 0, function () {
            return tslib_1.__generator(this, function (_a) {
                return [2 /*return*/, this.digestSync()];
            });
        });
    };
    Sha256.prototype.reset = function () {
        this.hash = new RawSha256_1.RawSha256();
        if (this.secret) {
            this.outer = new RawSha256_1.RawSha256();
            var inner = bufferFromSecret(this.secret);
            var outer = new Uint8Array(constants_1.BLOCK_SIZE);
            outer.set(inner);
            for (var i = 0; i < constants_1.BLOCK_SIZE; i++) {
                inner[i] ^= 0x36;
                outer[i] ^= 0x5c;
            }
            this.hash.update(inner);
            this.outer.update(outer);
            // overwrite the copied key in memory
            for (var i = 0; i < inner.byteLength; i++) {
                inner[i] = 0;
            }
        }
    };
    return Sha256;
}());
exports.Sha256 = Sha256;
function bufferFromSecret(secret) {
    var input = (0, util_1.convertToBuffer)(secret);
    if (input.byteLength > constants_1.BLOCK_SIZE) {
        var bufferHash = new RawSha256_1.RawSha256();
        bufferHash.update(input);
        input = bufferHash.digest();
    }
    var buffer = new Uint8Array(constants_1.BLOCK_SIZE);
    buffer.set(input);
    return buffer;
}
//# sourceMappingURL=jsSha256.js.map