Substitution of a matrix state in respect with a table Sbox.
[N] = NL_S_AESSubBytes(S,M)
S-box.
4x4 state matrix.
4x4 state matrix.
NL_S_AESSubBytes is the only non-linear transformation of the AES algorithm (WIKIPEDIA). In this step, each element of the matrix M is switched in respect with the substitution table S. .
//128 bits key128h={'2b','7e','15','16','28','ae','d2','a6','ab','f7','15','88','09','cf','4f','3c'};//16 bytes key128=hex2dec(key128h); [s128]=NL_S_AESInitialization(key128);//initialization of the structure inh={'32','43','f6','a8','88','5a','30','8d','31','31','98','a2','e0','37','07','34'};//plain text in=hex2dec(inh);//decimal state = matrix(in, 4, 4)//reshape [SState]=NL_S_AESSubBytes(s128.s_box,state)//application of NL_S_AESSubBytes s128.s_box(state+1) | ![]() | ![]() |