Function safe_app::ffi::crypto::encrypt

#[no_mangle]
pub unsafe extern "C" fn encrypt(
    app: *const App, 
    data: *const u8, 
    data_len: usize, 
    pk_h: EncryptPubKeyHandle, 
    sk_h: EncryptSecKeyHandle, 
    user_data: *mut c_void, 
    o_cb: extern "C" fn(user_data: *mut c_void, result: *const FfiResult, ciphertext: *const u8, ciphertext_len: usize)
)

Encrypts arbitrary data using a given key pair. You should provide a recipient's public key and a sender's secret key.

Callback parameters: user data, error code, ciphertext vector, vector size