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:
    CryptorHeader.tryGetMetadataSizeFromStream = function (stream) {
        var sizeBuf = stream.read(1);
        if (sizeBuf && sizeBuf[0] < 255) {
            return sizeBuf[0];
        }
        if (sizeBuf[0] === 255) {
            var nextBuf = stream.read(2);
            if (nextBuf.length >= 2) {
                return new Uint16Array([nextBuf[0], nextBuf[1]]).reduce(function (acc, val) { return (acc << 8) + val; }, 0);
            }
        }
        throw new Error('decryption error. Invalid metadata size');
    };