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:
    NodeCryptography.prototype.encryptStream = function (key, stream) {
        var output = new stream_1.PassThrough();
        var bIv = this.getIv();
        var aes = (0, crypto_1.createCipheriv)(this.algo, key, bIv);
        output.write(bIv);
        stream.pipe(aes).pipe(output);
        return output;
    };