Function crypto_aead_chacha20poly1305_ietf_decrypt_detached_inplace 

pub fn crypto_aead_chacha20poly1305_ietf_decrypt_detached_inplace(
    data: &mut [u8],
    mac: &Mac,
    associated_data: Option<&[u8]>,
    nonce: &Nonce,
    key: &Key,
) -> Result<(), Error>

In-place detached variant of crypto_aead_chacha20poly1305_ietf_decrypt_detached. On a failed tag check data is left unchanged, so the ciphertext survives (libsodium zeroes it; see Behavior on failure).

Errors

Returns an error if data exceeds the maximum supported message length or authentication fails.