private byte[] InverseSecondRound(byte[] cipherText, byte[] roundKey)
{
var inversedRoundKey = Aes16Helper.AddRoundKey(cipherText, roundKey);
var inversedShiftRow = Aes16Helper.ShiftRow(inversedRoundKey);
var inversedNibbleSubstitution = Aes16Helper.InverseNibbleSubstitution(inversedShiftRow);
return(inversedNibbleSubstitution);
}
private byte[] InverseFirstRound(byte[] firstRoundCipherText, byte[] roundKey)
{
var inversedRoundKey = Aes16Helper.AddRoundKey(firstRoundCipherText, roundKey);
var inversedMixColumns = Aes16Helper.InverseMixColumns(inversedRoundKey);
var inversedShiftRow = Aes16Helper.ShiftRow(inversedMixColumns);
var inversedNibbleSubstitution = Aes16Helper.InverseNibbleSubstitution(inversedShiftRow);
return(inversedNibbleSubstitution);
}
