Function createCipherAes256Cbc

createCipherAes256Cbc(
key: ArrayBuffer | Uint8Array<ArrayBufferLike>,
iv: ArrayBuffer | Uint8Array<ArrayBufferLike>,
): Cipher
Create AES-256-CBC cipher for streaming encryption
Parameters
- key: ArrayBuffer | Uint8Array<ArrayBufferLike>
  Encryption key (32 bytes)
- iv: ArrayBuffer | Uint8Array<ArrayBufferLike>
  Initialization vector (16 bytes)
Returns Cipher
Cipher object