Function aes256ecbEncrypt

aes256ecbEncrypt(fileKey: ByteArray, data: ByteArray): Promise<ByteArray>
Encrypts data using AES-256-ECB mode.
Parameters
- fileKey: ByteArray
  The 32-byte encryption key.
- data: ByteArray
  The data to encrypt.
Returns Promise<ByteArray>
A promise that resolves to the encrypted data.
Throws
Error if the key is not exactly 32 bytes.
Example
```
const encrypted = await aes256ecbEncrypt(key, plaintext)
```
- Defined in packages/pdf-lite/src/utils/algos.ts:266