open method
Implementation
@override
Uint8List open(Uint8List nonceAndCiphertext, Uint8List key) {
var nonce =
nonceAndCiphertext.sublist(0, sodium!.crypto.secretBox.nonceBytes);
var ciphertext =
nonceAndCiphertext.sublist(sodium!.crypto.secretBox.nonceBytes);
return sodium!.crypto.secretBox.openEasy(
cipherText: ciphertext,
nonce: nonce,
key: SecureKey.fromList(sodium!, key));
}