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.getHeaderData = function (encrypted) {
            if (!encrypted.metadata)
                return;
            var header = CryptorHeader.from(this.defaultCryptor.identifier, encrypted.metadata);
            var headerData = new Uint8Array(header.length);
            var pos = 0;
            headerData.set(header.data, pos);
            pos += header.length - encrypted.metadata.byteLength;
            headerData.set(new Uint8Array(encrypted.metadata), pos);
            return headerData.buffer;
        };