Function aes256ecbDecrypt

aes256ecbDecrypt(fileKey: ByteArray, encrypted: ByteArray): Promise<ByteArray>
Decrypts data using AES-256-ECB mode.
Parameters
- fileKey: ByteArray
  The 32-byte decryption key.
- encrypted: ByteArray
  The encrypted data to decrypt.
Returns Promise<ByteArray>
A promise that resolves to the decrypted data.
Throws
Error if the key is not exactly 32 bytes.
Example
```
const decrypted = await aes256ecbDecrypt(key, ciphertext)
```
- Defined in packages/pdf-lite/src/utils/algos.ts:295