Function encrypt_stream_frames 

pub fn encrypt_stream_frames(
    plaintext: &[u8],
    stream_id: E2eStreamId,
    sender_public_key: PublicKey<33>,
    recipient_public_key: PublicKey<33>,
    max_plaintext_frame_len: usize,
) -> Result<E2eStreamFrames<'_, ThreadRng>>

Encrypt a byte slice lazily with the default thread-local RNG.