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.concatArrayBuffer = function (ab1, ab2) {
            var tmp = new Uint8Array(ab1.byteLength + ab2.byteLength);
            tmp.set(new Uint8Array(ab1), 0);
            tmp.set(new Uint8Array(ab2), ab1.byteLength);
            return tmp.buffer;
        };