Language: JavaScript
Label: safe
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:
    CryptoModule.prototype.onStreamReadable = function (stream, file, File) {
        return __awaiter(this, void 0, void 0, function () {
            var magicBytes, versionByte, identifier, cryptor, headerSize, _a, _b;
            var _c;
            return __generator(this, function (_d) {
                switch (_d.label) {
                    case 0:
                        stream.removeAllListeners('readable');
                        magicBytes = stream.read(4);
                        if (!CryptorHeader.isSentinel(magicBytes)) {
                            if (magicBytes === null)
                                throw new Error('decryption error. empty content');
                            stream.unshift(magicBytes);
                            return [2 /*return*/, this.decryptLegacyFileStream(stream, file, File)];
                        }
                        versionByte = stream.read(1);
                        CryptorHeader.validateVersion(versionByte[0]);
                        identifier = stream.read(4);
                        cryptor = this.getCryptorFromId(CryptorHeader.tryGetIdentifier(identifier));
                        headerSize = CryptorHeader.tryGetMetadataSizeFromStream(stream);
                        if (file.contentLength <= CryptorHeader.MIN_HEADER_LEGTH + headerSize)
                            throw new Error('decryption error. empty content');
                        _b = (_a = File).create;
                        _c = {
                            name: file.name,
                            mimeType: 'application/octet-stream'
                        };
                        return [4 /*yield*/, cryptor.decryptStream({ stream: stream, metadataLength: headerSize })];
                    case 1: return [2 /*return*/, _b.apply(_a, [(_c.stream = _d.sent(),
                                _c)])];
                }
            });
        });
    };