Language: JavaScript
Label: vulnerable
CWE: CWE-331 \u2014 Insufficient Entropy
The product uses an algorithm or scheme that produces insufficient entropy, leaving patterns or clusters of values that are more likely to occur than others.

Code:
    WebCryptography.prototype.encryptFile = function (key, file, File) {
        return __awaiter(this, void 0, void 0, function () {
            var bKey, abPlaindata, abCipherdata;
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0: return [4 /*yield*/, this.getKey(key)];
                    case 1:
                        bKey = _a.sent();
                        return [4 /*yield*/, file.toArrayBuffer()];
                    case 2:
                        abPlaindata = _a.sent();
                        return [4 /*yield*/, this.encryptArrayBuffer(bKey, abPlaindata)];
                    case 3:
                        abCipherdata = _a.sent();
                        return [2 /*return*/, File.create({
                                name: file.name,
                                mimeType: 'application/octet-stream',
                                data: abCipherdata,
                            })];
                }
            });
        });
    };