Лабораторная работа: Методы и средства защиты компьютерной информации

for (i = Nk; i<Nb* (Nr+1); i++)

{

temp = ExpandedKey [i - 1] ; if (i% Nk == 0)

temp = ByteSub (RotByte (temp)) ^Rcon [i/Nk] ; ExpandedKeyp] = ExpandedKey [i - Nk] ^temp;

}

}

ГенерацияключаприL_k = 8:

KeyExpansion (byte CipherKey, word ExpandedKey)

{

for (i = 0; i < Nk; i++)

ExpandedKey [i] = (CipherKey [4*i], CipherKey [4*i + 1], CipherKey [4*i + 2], CipherKey [4*i + 3]);

for (i = Nk; i < Nb * (Nr + 1); i++)

{

temp = ExpandedKey [i - 1] ; if (i% Nk == 0)

temp = ByteSub (RotByte (temp)) ^Rcon [i/Nk] ; else if (i% Nk == 4)

temp = ByteSub (temp); ExpandedKey [i] = ExpandedKey [i - Nk] ^temp;

}

}

Раундовыефункции:

Round (word State, word RoundKey)

{

ByteSub (State);

ShiftRow (State); MixColumn (State); AddRoundKey (State, RoundKey)

FinalRound (word State, word RoundKey) {

ByteSub (State);

ShiftRow (State);

AddRoundKey (State, RoundKey)

}

Полная процедура зашифрования блока текста: