Function decrypt_to_vec 

pub fn decrypt_to_vec(
    key: &[u8; 32],
    ciphertext: &[u8],
    aad: &[u8],
) -> Result<Vec<u8>, CryptoError>

Decrypts ciphertext into a byte buffer.

Functionally identical to decrypt() but uses in-place decryption (avoids an extra allocation for the tag-stripped copy).