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aes.c
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#include "aes.h"
#include "gmult.h"
//Number of columns
const int Nb = 4;
//Number of strings
const int Nk = 4;
//Number of rounds
const int Nr = 10;
static uint8_t s_box[256] =
{
0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16
};
static uint8_t inv_s_box[256] =
{
0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,
0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,
0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,
0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,
0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,
0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d
};
void sub_bytes(uint8_t *state)
{
for (uint8_t i = 0; i < 4; i++)
{
for (uint8_t j = 0; j < Nb; j++)
{
state[Nb*i + j] = s_box[state[Nb*i + j]];
}
}
}
void inv_sub_bytes(uint8_t *state)
{
for (uint8_t i = 0; i < 4; i++)
{
for (uint8_t j = 0; j < Nb; j++)
{
state[Nb*i + j] = inv_s_box[state[Nb*i + j]];
}
}
}
void shift_rows(uint8_t *state)
{
uint8_t s, tmp;
for (uint8_t i = 1; i < 4; i++)
{
s = 0;
while (s < i)
{
tmp = state[Nb*i + 0];
for (uint8_t k = 1; k < Nb; k++)
{
state[Nb*i + k - 1] = state[Nb*i + k];
}
state[Nb*i + Nb - 1] = tmp;
s++;
}
}
}
void inv_shift_rows(uint8_t *state)
{
uint8_t s, tmp;
for (uint8_t i = 1; i < 4; i++)
{
s = 0;
while (s < i)
{
tmp = state[Nb*i + Nb - 1];
for (uint8_t k = Nb - 1; k > 0; k--)
{
state[Nb*i + k] = state[Nb*i + k - 1];
}
state[Nb*i + 0] = tmp;
s++;
}
}
}
void multiplicationforMIX(uint8_t *a, uint8_t *b, uint8_t *c)
{
c[0] = gmult(a[0], b[0]) ^ gmult(a[3], b[1]) ^ gmult(a[2], b[2]) ^ gmult(a[1], b[3]);
c[1] = gmult(a[1], b[0]) ^ gmult(a[0], b[1]) ^ gmult(a[3], b[2]) ^ gmult(a[2], b[3]);
c[2] = gmult(a[2], b[0]) ^ gmult(a[1], b[1]) ^ gmult(a[0], b[2]) ^ gmult(a[3], b[3]);
c[3] = gmult(a[3], b[0]) ^ gmult(a[2], b[1]) ^ gmult(a[1], b[2]) ^ gmult(a[0], b[3]);
//uint8_t a[] = {0x02, 0x01, 0x01, 0x03};
}
void mix_columns(uint8_t *state)
{
uint8_t a[] = {0x02, 0x01, 0x01, 0x03}; // a(x) = {02} + {01}x + {01}x2 + {03}x3
uint8_t colomn[4], res[4];
for (uint8_t j = 0; j < Nb; j++)
{
for (uint8_t i = 0; i < 4; i++)
{
colomn[i] = state[Nb*i+j];
}
multiplicationforMIX(a, colomn, res);
for (uint8_t i = 0; i < 4; i++)
{
state[Nb*i+j] = res[i];
}
}
}
void inv_mix_columns(uint8_t *state)
{
uint8_t a[] = {0x0e, 0x09, 0x0d, 0x0b}; // a(x) = {0e} + {09}x + {0d}x2 + {0b}x3
uint8_t colomn[4], res[4];
for (uint8_t j = 0; j < Nb; j++)
{
for (uint8_t i = 0; i < 4; i++)
{
colomn[i] = state[Nb*i + j];
}
multiplicationforMIX(a, colomn, res);
for (uint8_t i = 0; i < 4; i++)
{
state[Nb*i + j] = res[i];
}
}
}
void add_round_key(uint8_t *state, uint8_t *expandedkey, uint8_t r)
{
for (uint8_t c = 0; c < Nb; c++)
{
state[Nb*0 + c] = state[Nb*0 + c] ^ expandedkey[4*Nb*r + 4*c + 0];
state[Nb*1 + c] = state[Nb*1 + c] ^ expandedkey[4*Nb*r + 4*c + 1];
state[Nb*2 + c] = state[Nb*2 + c] ^ expandedkey[4*Nb*r + 4*c + 2];
state[Nb*3 + c] = state[Nb*3 + c] ^ expandedkey[4*Nb*r + 4*c + 3];
}
}
void sub_word(uint8_t *key)
{
for (uint8_t i = 0; i < 4; i++)
{
key[i] = s_box[key[i]];
}
}
void rot_word(uint8_t *key)
{
uint8_t tmp;
tmp = key[0];
for (uint8_t i = 0; i < 3; i++)
{
key[i] = key[i+1];
}
key[3] = tmp;
}
void addition(uint8_t *a, uint8_t *b, uint8_t *c)
{
c[0] = a[0]^b[0];
c[1] = a[1]^b[1];
c[2] = a[2]^b[2];
c[3] = a[3]^b[3];
}
uint8_t R[] = {0x00, 0x00, 0x00, 0x00};
uint8_t * Rcon(uint8_t i)
{
if (i == 1)
{
R[0] = 0x01;
}
else if (i > 1)
{
R[0] = 0x02;
i--;
while (i > 1)
{
R[0] = gmult(R[0], 0x02);
i--;
}
}
return R;
}
void aes_key_expansion(uint8_t *key, uint8_t *expandedkey)
{
uint8_t tmp[4];
uint8_t len = Nb*(Nr+1);
for (uint8_t i = 0; i < Nk; i++)
{
expandedkey[4*i+0] = key[4*i+0];
expandedkey[4*i+1] = key[4*i+1];
expandedkey[4*i+2] = key[4*i+2];
expandedkey[4*i+3] = key[4*i+3];
}
for (uint8_t i = Nk; i < len; i++)
{
tmp[0] = expandedkey[4*(i-1)+0];
tmp[1] = expandedkey[4*(i-1)+1];
tmp[2] = expandedkey[4*(i-1)+2];
tmp[3] = expandedkey[4*(i-1)+3];
if (i%Nk == 0)
{
rot_word(tmp);
sub_word(tmp);
addition(tmp, Rcon(i/Nk), tmp);
}
else if (Nk > 6 && i%Nk == 4)
{
sub_word(tmp);
}
expandedkey[4*i+0] = expandedkey[4*(i-Nk)+0]^tmp[0];
expandedkey[4*i+1] = expandedkey[4*(i-Nk)+1]^tmp[1];
expandedkey[4*i+2] = expandedkey[4*(i-Nk)+2]^tmp[2];
expandedkey[4*i+3] = expandedkey[4*(i-Nk)+3]^tmp[3];
}
}
void aes_cipher(uint8_t *in, uint8_t *out, uint8_t *expandedkey)
{
uint8_t state[4*Nb];
for (uint8_t i = 0; i < 4; i++)
{
for (uint8_t j = 0; j < Nb; j++)
{
state[Nb*i+j] = in[i+4*j];
}
}
add_round_key(state, expandedkey, 0);
for (uint8_t r = 1; r < Nr; r++)
{
sub_bytes(state);
shift_rows(state);
mix_columns(state);
add_round_key(state, expandedkey, r);
}
sub_bytes(state);
shift_rows(state);
add_round_key(state, expandedkey, Nr);
for (uint8_t i = 0; i < 4; i++)
{
for (uint8_t j = 0; j < Nb; j++)
{
out[i+4*j] = state[Nb*i+j];
}
}
}
void aes_inv_cipher(uint8_t *in, uint8_t *out, uint8_t *expandedkey)
{
uint8_t state[4*Nb];
for (uint8_t i = 0; i < 4; i++)
{
for (uint8_t j = 0; j < Nb; j++)
{
state[Nb*i+j] = in[i+4*j];
}
}
add_round_key(state, expandedkey, Nr);
for (uint8_t r = Nr-1; r >= 1; r--)
{
inv_shift_rows(state);
inv_sub_bytes(state);
add_round_key(state, expandedkey, r);
inv_mix_columns(state);
}
inv_shift_rows(state);
inv_sub_bytes(state);
add_round_key(state, expandedkey, 0);
for (uint8_t i = 0; i < 4; i++)
{
for (uint8_t j = 0; j < Nb; j++)
{
out[i+4*j] = state[Nb*i+j];
}
}
}