Function indy_crypto_anon_decrypt 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn indy_crypto_anon_decrypt(
    command_handle: Handle,
    wallet_handle: Handle,
    recipient_vk: CString,
    encrypted_msg_raw: BString,
    encrypted_msg_len: u32,
    cb: Option<ResponseSliceCB>,
) -> Error