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 encryptFile(key, file, File) {
    const bKey = await this.getKey(key);

    const abPlaindata = await file.toArrayBuffer();

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

    return File.create({
      name: file.name,
      mimeType: 'application/octet-stream',
      data: abCipherdata,
    });
  }