Function crypto_aead_chacha20poly1305_ietf_encrypt_inplace 

pub fn crypto_aead_chacha20poly1305_ietf_encrypt_inplace(
    data: &mut [u8],
    associated_data: Option<&[u8]>,
    nonce: &Nonce,
    key: &Key,
) -> Result<(), Error>

Encrypts data in place and appends the authentication tag.

The last CRYPTO_AEAD_CHACHA20POLY1305_IETF_ABYTES bytes are reserved for the tag and are ignored as plaintext input.

Errors

Returns an error if data is shorter than an authentication tag or its plaintext portion exceeds the maximum supported message length.