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:
    WebCryptography.prototype.getKey = function (key) {
        return __awaiter(this, void 0, void 0, function () {
            var bKey, abHash, abKey;
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0:
                        bKey = Buffer.from(key);
                        return [4 /*yield*/, crypto.subtle.digest('SHA-256', bKey.buffer)];
                    case 1:
                        abHash = _a.sent();
                        abKey = Buffer.from(Buffer.from(abHash).toString('hex').slice(0, 32), 'utf8').buffer;
                        return [2 /*return*/, crypto.subtle.importKey('raw', abKey, 'AES-CBC', true, ['encrypt', 'decrypt'])];
                }
            });
        });
    };