50     pub fn public_key(&self) -> Result<Vec<u8>> {  in public_key()
61         salt: &[u8],  in agree_key()
62         other_public_key: &[u8],  in agree_key()
63         sender_public_key: &[u8],  in agree_key()
64         recipient_public_key: &[u8],  in agree_key()
84         recipient_public_key: &[u8],  in encrypt_message()
85         message: &[u8],  in encrypt_message()
86     ) -> Result<(Vec<u8>, Vec<u8>, Vec<u8>, Vec<u8>, Vec<u8>)> {  in encrypt_message()
105         sender_public_key: &[u8],  in decrypt_message()
106         salt: &[u8],  in decrypt_message()
107         iv: &[u8],  in decrypt_message()
108         ciphertext: &[u8],  in decrypt_message()
109         tag: &[u8],  in decrypt_message()