Function deriveObjectKey

deriveObjectKey(
    mkey: ByteArray,
    objNumber: number,
    objGeneration: number,
    useAesSalt?: boolean,
): Promise<ByteArray>
Derives an object-specific encryption key from the master key. Used to encrypt individual PDF objects with unique keys.
Parameters
- mkey: ByteArray
  The master encryption key.
- objNumber: number
  The PDF object number.
- objGeneration: number
  The PDF object generation number.
- useAesSalt: boolean = true
  Whether to include the AES salt ('sAlT'). Defaults to true.
Returns Promise<ByteArray>
A promise that resolves to the derived object key.
Example
```
const objectKey = await deriveObjectKey(masterKey, 5, 0)
```
- Defined in packages/pdf-lite/src/crypto/key-derivation/key-derivation.ts:99