Function indy_sys::crypto::indy_crypto_anon_decrypt

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