Function crypto_secretbox_easy_inplace 

pub fn crypto_secretbox_easy_inplace(
    data: &mut [u8],
    nonce: &Nonce,
    key: &Key,
) -> Result<(), Error>

Encrypts message with nonce and key in-place, without allocating additional memory for ciphertext.

Errors

Returns an error if data is shorter than an authentication tag.