Language: TypeScript
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:
  async decryptFile(key, file, File) {
    const bKey = await this.getKey(key);

    const abCipherdata = await file.toArrayBuffer();

    const abPlaindata = await this.decryptArrayBuffer(bKey, abCipherdata);

    return File.create({
      name: file.name,
      data: abPlaindata,
    });
  }