Function tox_crypto::secretbox::xsalsa20poly1305::open

pub fn open(c: &[u8], n: &Nonce, k: &Key) -> Result<Vec<u8, Global>, ()>

open() verifies and decrypts a ciphertext c using a secret key k and a nonce n. It returns a plaintext Ok(m). If the ciphertext fails verification, open() returns Err(()).