#include "stdafx.h"
#include
#include "aes.h"
#define Nb 4
#define Nk 8
#define Nr 14
typedef uint8_t state_t[4][4];
static const uint8_t sbox[256] = {
0x03, 0x10, 0xD1, 0xD5, 0xC9, 0x27, 0xC8, 0x68, 0xB3, 0xEF, 0x30, 0xFA, 0x33, 0xB0, 0xCA, 0x51,
0x7E, 0x37, 0x74, 0xF6, 0xC7, 0x4B, 0xE3, 0x0A, 0x36, 0x98, 0x9B, 0xB6, 0xD3, 0x9E, 0x1D, 0x77,
0x9D, 0x46, 0xED, 0x8C, 0xEC, 0xE6, 0xA7, 0x12, 0x92, 0xF4, 0x76, 0xDC, 0xA0, 0x14, 0x24, 0xD9,
0x20, 0x79, 0x59, 0x08, 0x4E, 0xB1, 0x07, 0x90, 0xAA, 0x2E, 0xD7, 0x4F, 0x11, 0xCD, 0xC5, 0x8A,
0xA5, 0x1C, 0x6A, 0x19, 0xC2, 0x66, 0xB4, 0xBC, 0x94, 0xC0, 0x9C, 0x2D, 0xE1, 0x29, 0xE2, 0x15,
0x55, 0x2A, 0x97, 0x81, 0xCF, 0x1A, 0x5A, 0xF5, 0x2C, 0xF3, 0xDD, 0x93, 0xB5, 0x4A, 0xE0, 0x39,
0x57, 0x6F, 0x6E, 0xD6, 0x0C, 0x61, 0xAE, 0x31, 0xFF, 0xBD, 0xCE, 0x35, 0xD2, 0x5C, 0x40, 0x82,
0x17, 0x89, 0x75, 0xE7, 0x7C, 0xA6, 0x32, 0x01, 0x22, 0x78, 0x18, 0x3A, 0x5D, 0x44, 0xAD, 0x84,
0x45, 0x6B, 0xDB, 0xC3, 0x25, 0x5F, 0x06, 0x7F, 0xF0, 0xAB, 0xFD, 0x60, 0x2F, 0x3B, 0x00, 0x48,
0x2B, 0xFB, 0x96, 0x9F, 0x05, 0xE5, 0x91, 0x1E, 0x8F, 0x0F, 0x50, 0xA9, 0x0D, 0xF9, 0x3D, 0x21,
0xFE, 0xEE, 0x1B, 0x04, 0x13, 0x95, 0xB7, 0x42, 0xBF, 0x7A, 0x3E, 0x49, 0xB2, 0xAF, 0xCC, 0x28,
0xCB, 0x8D, 0x70, 0x54, 0xDE, 0x99, 0x3C, 0x26, 0xF7, 0x83, 0x85, 0x7D, 0x34, 0xE9, 0xBA, 0x3F,
0x9A, 0xDF, 0x02, 0x69, 0x5E, 0x7B, 0x43, 0x38, 0x67, 0xD8, 0xA4, 0xC4, 0xEA, 0x88, 0xE4, 0xD4,
0xBB, 0xB8, 0x47, 0xA2, 0xE8, 0x23, 0xA8, 0xF8, 0x73, 0x58, 0xF1, 0x6D, 0x1F, 0xAC, 0x65, 0x86,
0x8E, 0x09, 0x0E, 0x0B, 0xDA, 0xEB, 0x41, 0x62, 0xD0, 0x5B, 0x6C, 0x87, 0x4C, 0xFC, 0x71, 0x8B,
0x56, 0x4D, 0x64, 0xC1, 0x52, 0xA1, 0xBE, 0xB9, 0xC6, 0x53, 0x80, 0xF2, 0x16, 0x72, 0xA3, 0x63
};
static const uint8_t rsbox[256] = {
0x8E, 0x77, 0xC2, 0x00, 0xA3, 0x94, 0x86, 0x36, 0x33, 0xE1, 0x17, 0xE3, 0x64, 0x9C, 0xE2, 0x99,
0x01, 0x3C, 0x27, 0xA4, 0x2D, 0x4F, 0xFC, 0x70, 0x7A, 0x43, 0x55, 0xA2, 0x41, 0x1E, 0x97, 0xDC,
0x30, 0x9F, 0x78, 0xD5, 0x2E, 0x84, 0xB7, 0x05, 0xAF, 0x4D, 0x51, 0x90, 0x58, 0x4B, 0x39, 0x8C,
0x0A, 0x67, 0x76, 0x0C, 0xBC, 0x6B, 0x18, 0x11, 0xC7, 0x5F, 0x7B, 0x8D, 0xB6, 0x9E, 0xAA, 0xBF,
0x6E, 0xE6, 0xA7, 0xC6, 0x7D, 0x80, 0x21, 0xD2, 0x8F, 0xAB, 0x5D, 0x15, 0xEC, 0xF1, 0x34, 0x3B,
0x9A, 0x0F, 0xF4, 0xF9, 0xB3, 0x50, 0xF0, 0x60, 0xD9, 0x32, 0x56, 0xE9, 0x6D, 0x7C, 0xC4, 0x85,
0x8B, 0x65, 0xE7, 0xFF, 0xF2, 0xDE, 0x45, 0xC8, 0x07, 0xC3, 0x42, 0x81, 0xEA, 0xDB, 0x62, 0x61,
0xB2, 0xEE, 0xFD, 0xD8, 0x12, 0x72, 0x2A, 0x1F, 0x79, 0x31, 0xA9, 0xC5, 0x74, 0xBB, 0x10, 0x87,
0xFA, 0x53, 0x6F, 0xB9, 0x7F, 0xBA, 0xDF, 0xEB, 0xCD, 0x71, 0x3F, 0xEF, 0x23, 0xB1, 0xE0, 0x98,
0x37, 0x96, 0x28, 0x5B, 0x48, 0xA5, 0x92, 0x52, 0x19, 0xB5, 0xC0, 0x1A, 0x4A, 0x20, 0x1D, 0x93,
0x2C, 0xF5, 0xD3, 0xFE, 0xCA, 0x40, 0x75, 0x26, 0xD6, 0x9B, 0x38, 0x89, 0xDD, 0x7E, 0x66, 0xAD,
0x0D, 0x35, 0xAC, 0x08, 0x46, 0x5C, 0x1B, 0xA6, 0xD1, 0xF7, 0xBE, 0xD0, 0x47, 0x69, 0xF6, 0xA8,
0x49, 0xF3, 0x44, 0x83, 0xCB, 0x3E, 0xF8, 0x14, 0x06, 0x04, 0x0E, 0xB0, 0xAE, 0x3D, 0x6A, 0x54,
0xE8, 0x02, 0x6C, 0x1C, 0xCF, 0x03, 0x63, 0x3A, 0xC9, 0x2F, 0xE4, 0x82, 0x2B, 0x5A, 0xB4, 0xC1,
0x5E, 0x4C, 0x4E, 0x16, 0xCE, 0x95, 0x25, 0x73, 0xD4, 0xBD, 0xCC, 0xE5, 0x24, 0x22, 0xA1, 0x09,
0x88, 0xDA, 0xFB, 0x59, 0x29, 0x57, 0x13, 0xB8, 0xD7, 0x9D, 0x0B, 0x91, 0xED, 0x8A, 0xA0, 0x68
};
static const uint8_t Rcon[11] = {
0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36
};
#define getSBoxValue(num) (sbox[(num)])
#define getSBoxInvert(num) (rsbox[(num)])
static void KeyExpansion(uint8_t* RoundKey, const uint8_t* Key)
{
unsigned i, j, k;
uint8_t tempa[4];
for (i = 0; i < Nk; ++i)
{
RoundKey[(i * 4) + 0] = Key[(i * 4) + 0];
RoundKey[(i * 4) + 1] = Key[(i * 4) + 1];
RoundKey[(i * 4) + 2] = Key[(i * 4) + 2];
RoundKey[(i * 4) + 3] = Key[(i * 4) + 3];
}
for (i = Nk; i < Nb * (Nr + 1); ++i)
{
{
k = (i - 1) * 4;
tempa[0]=RoundKey[k + 0];
tempa[1]=RoundKey[k + 1];
tempa[2]=RoundKey[k + 2];
tempa[3]=RoundKey[k + 3];
}
if (i % Nk == 0)
{
{
const uint8_t u8tmp = tempa[0];
tempa[0] = tempa[1];
tempa[1] = tempa[2];
tempa[2] = tempa[3];
tempa[3] = u8tmp;
}
{
tempa[0] = getSBoxValue(tempa[0]);
tempa[1] = getSBoxValue(tempa[1]);
tempa[2] = getSBoxValue(tempa[2]);
tempa[3] = getSBoxValue(tempa[3]);
}
tempa[0] = tempa[0] ^ Rcon[i/Nk];
}
if (i % Nk == 4)
{
{
tempa[0] = getSBoxValue(tempa[0]);
tempa[1] = getSBoxValue(tempa[1]);
tempa[2] = getSBoxValue(tempa[2]);
tempa[3] = getSBoxValue(tempa[3]);
}
}
j = i * 4; k=(i - Nk) * 4;
RoundKey[j + 0] = RoundKey[k + 0] ^ tempa[0];
RoundKey[j + 1] = RoundKey[k + 1] ^ tempa[1];
RoundKey[j + 2] = RoundKey[k + 2] ^ tempa[2];
RoundKey[j + 3] = RoundKey[k + 3] ^ tempa[3];
}
}
void AES_init_ctx(struct AES_ctx* ctx, const uint8_t* key)
{
KeyExpansion(ctx->RoundKey, key);
}
static void AddRoundKey(uint8_t round,state_t* state,uint8_t* RoundKey)
{
uint8_t i,j;
for (i = 0; i < 4; ++i)
{
for (j = 0; j < 4; ++j)
{
(*state)[i][j] ^= RoundKey[(round * Nb * 4) + (i * Nb) + j];
}
}
}
static void Transpose(state_t* state)
{
int row, col;
state_t tmp;
for (row = 0; row < 4; row++)
{
for (col = 0; col < 4; col++)
{
tmp[row][col] = (*state)[col][row];
}
}
memcpy(state, tmp, 16);
}
static void SubBytes(state_t* state)
{
uint8_t i, j;
for (i = 0; i < 4; ++i)
{
for (j = 0; j < 4; ++j)
{
(*state)[j][i] = getSBoxValue((*state)[j][i]);
}
}
}
static void InvSubBytes(state_t* state)
{
uint8_t i, j;
for (i = 0; i < 4; ++i)
{
for (j = 0; j < 4; ++j)
{
(*state)[j][i] = getSBoxInvert((*state)[j][i]);
}
}
}
static void ShiftRows(state_t* state)
{
uint8_t temp1;
uint8_t temp2;
temp1 = (*state)[2][1];
temp2 = (*state)[3][1];
(*state)[2][1] = (*state)[0][1];
(*state)[3][1] = (*state)[1][1];
(*state)[0][1] = temp1;
(*state)[1][1] = temp2;
temp1 = (*state)[2][2];
temp2 = (*state)[3][2];
(*state)[2][2] = (*state)[0][2];
(*state)[3][2] = (*state)[1][2];
(*state)[0][2] = temp1;
(*state)[1][2] = temp2;
temp1 = (*state)[3][3];
(*state)[3][3] = (*state)[2][3];
(*state)[2][3] = (*state)[1][3];
(*state)[1][3] = (*state)[0][3];
(*state)[0][3] = temp1;
}
static void InvShiftRows(state_t* state)
{
uint8_t temp1;
uint8_t temp2;
temp1 = (*state)[0][1];
temp2 = (*state)[1][1];
(*state)[0][1] = (*state)[2][1];
(*state)[1][1] = (*state)[3][1];
(*state)[2][1] = temp1;
(*state)[3][1] = temp2;
temp1 = (*state)[0][2];
temp2 = (*state)[1][2];
(*state)[0][2] = (*state)[2][2];
(*state)[1][2] = (*state)[3][2];
(*state)[2][2] = temp1;
(*state)[3][2] = temp2;
temp1 = (*state)[0][3];
(*state)[0][3] = (*state)[1][3];
(*state)[1][3] = (*state)[2][3];
(*state)[2][3] = (*state)[3][3];
(*state)[3][3] = temp1;
}
static uint8_t xtime(uint8_t x)
{
return ((x<<1) ^ (((x>>7) & 1) * 0x1b));
}
static uint8_t Multiply(uint8_t x, uint8_t y)
{
uint8_t v = 0;
v ^= (y & 1) * x;
v ^= (y>>1 & 1) * xtime(x);
v ^= (y>>2 & 1) * xtime(xtime(x));
v ^= (y>>3 & 1) * xtime(xtime(xtime(x)));
v ^= (y>>4 & 1) * xtime(xtime(xtime(xtime(x))));
return v;
}
static void MixColumns(state_t* state)
{
int i;
uint8_t a, b, c, d;
uint8_t e, f, g, h;
uint8_t tmp[4][4] = {0};
for (i = 0; i < 2; i++)
{
a = (*state)[0][i+0];
b = (*state)[1][i+0];
c = (*state)[2][i+0];
d = (*state)[3][i+0];
e = (*state)[0][i+2];
f = (*state)[1][i+2];
g = (*state)[2][i+2];
h = (*state)[3][i+2];
tmp[0][i+0] = Multiply(a, 0x0B) ^ Multiply(b, 0x08) ^ Multiply(c, 0x06) ^ Multiply(d, 0x05) ^ Multiply(e, 0x04) ^ Multiply(f, 0x03) ^ Multiply(g, 0x01) ^ Multiply(h, 0x07);
tmp[1][i+0] = Multiply(a, 0x08) ^ Multiply(b, 0x0B) ^ Multiply(c, 0x05) ^ Multiply(d, 0x06) ^ Multiply(e, 0x03) ^ Multiply(f, 0x04) ^ Multiply(g, 0x07) ^ Multiply(h, 0x01);
tmp[2][i+0] = Multiply(a, 0x06) ^ Multiply(b, 0x05) ^ Multiply(c, 0x0B) ^ Multiply(d, 0x08) ^ Multiply(e, 0x01) ^ Multiply(f, 0x07) ^ Multiply(g, 0x04) ^ Multiply(h, 0x03);
tmp[3][i+0] = Multiply(a, 0x05) ^ Multiply(b, 0x06) ^ Multiply(c, 0x08) ^ Multiply(d, 0x0B) ^ Multiply(e, 0x07) ^ Multiply(f, 0x01) ^ Multiply(g, 0x03) ^ Multiply(h, 0x04);
tmp[0][i+2] = Multiply(a, 0x04) ^ Multiply(b, 0x03) ^ Multiply(c, 0x01) ^ Multiply(d, 0x07) ^ Multiply(e, 0x0B) ^ Multiply(f, 0x08) ^ Multiply(g, 0x06) ^ Multiply(h, 0x05);
tmp[1][i+2] = Multiply(a, 0x03) ^ Multiply(b, 0x04) ^ Multiply(c, 0x07) ^ Multiply(d, 0x01) ^ Multiply(e, 0x08) ^ Multiply(f, 0x0B) ^ Multiply(g, 0x05) ^ Multiply(h, 0x06);
tmp[2][i+2] = Multiply(a, 0x01) ^ Multiply(b, 0x07) ^ Multiply(c, 0x04) ^ Multiply(d, 0x03) ^ Multiply(e, 0x06) ^ Multiply(f, 0x05) ^ Multiply(g, 0x0B) ^ Multiply(h, 0x08);
tmp[3][i+2] = Multiply(a, 0x07) ^ Multiply(b, 0x01) ^ Multiply(c, 0x03) ^ Multiply(d, 0x04) ^ Multiply(e, 0x05) ^ Multiply(f, 0x06) ^ Multiply(g, 0x08) ^ Multiply(h, 0x0B);
}
memcpy(state, tmp, 16);
}
static void Cipher(state_t* state, uint8_t* RoundKey)
{
uint8_t round = 0;
AddRoundKey(0, state, RoundKey);
Transpose(state);
for (round = 1; round < Nr; ++round)
{
SubBytes(state);
ShiftRows(state);
MixColumns(state);
Transpose(state);
AddRoundKey(round, state, RoundKey);
}
SubBytes(state);
ShiftRows(state);
Transpose(state);
AddRoundKey(Nr, state, RoundKey);
}
static void InvCipher(state_t* state,uint8_t* RoundKey)
{
uint8_t round = 0;
AddRoundKey(Nr, state, RoundKey);
Transpose(state);
for (round = (Nr - 1); round > 0; --round)
{
InvShiftRows(state);
InvSubBytes(state);
AddRoundKey(round, state, RoundKey);
Transpose(state);
MixColumns(state);
}
InvShiftRows(state);
InvSubBytes(state);
Transpose(state);
AddRoundKey(0, state, RoundKey);
}
void AES_ECB_encrypt(struct AES_ctx *ctx, uint8_t* buf)
{
Cipher((state_t*)buf, ctx->RoundKey);
}
void AES_ECB_decrypt(struct AES_ctx* ctx, uint8_t* buf)
{
InvCipher((state_t*)buf, ctx->RoundKey);
}