📄 rijndael.cs
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(src[inOffset++] & 0xFF) << 8 |
(src[inOffset++] & 0xFF) ) ^ Kdr[0];
int t1 = ((src[inOffset++] & 0xFF) << 24 |
(src[inOffset++] & 0xFF) << 16 |
(src[inOffset++] & 0xFF) << 8 |
(src[inOffset++] & 0xFF) ) ^ Kdr[1];
int t2 = ((src[inOffset++] & 0xFF) << 24 |
(src[inOffset++] & 0xFF) << 16 |
(src[inOffset++] & 0xFF) << 8 |
(src[inOffset++] & 0xFF) ) ^ Kdr[2];
int t3 = ((src[inOffset++] & 0xFF) << 24 |
(src[inOffset++] & 0xFF) << 16 |
(src[inOffset++] & 0xFF) << 8 |
(src[inOffset++] & 0xFF) ) ^ Kdr[3];
int a0, a1, a2, a3;
for (int r = 1; r < _rounds; r++) {
Kdr = _Kd[r];
a0 = (T5[(t0 >> 24) & 0xFF] ^
T6[(t3 >> 16) & 0xFF] ^
T7[(t2 >> 8) & 0xFF] ^
T8[ t1 & 0xFF] ) ^ Kdr[0];
a1 = (T5[(t1 >> 24) & 0xFF] ^
T6[(t0 >> 16) & 0xFF] ^
T7[(t3 >> 8) & 0xFF] ^
T8[ t2 & 0xFF] ) ^ Kdr[1];
a2 = (T5[(t2 >> 24) & 0xFF] ^
T6[(t1 >> 16) & 0xFF] ^
T7[(t0 >> 8) & 0xFF] ^
T8[ t3 & 0xFF] ) ^ Kdr[2];
a3 = (T5[(t3 >> 24) & 0xFF] ^
T6[(t2 >> 16) & 0xFF] ^
T7[(t1 >> 8) & 0xFF] ^
T8[ t0 & 0xFF] ) ^ Kdr[3];
t0 = a0;
t1 = a1;
t2 = a2;
t3 = a3;
}
Kdr = _Kd[_rounds];
int tt = Kdr[0];
dst[outOffset + 0] = (byte)(Si[(t0 >> 24) & 0xFF] ^ (tt >> 24));
dst[outOffset + 1] = (byte)(Si[(t3 >> 16) & 0xFF] ^ (tt >> 16));
dst[outOffset + 2] = (byte)(Si[(t2 >> 8) & 0xFF] ^ (tt >> 8));
dst[outOffset + 3] = (byte)(Si[ t1 & 0xFF] ^ tt );
tt = Kdr[1];
dst[outOffset + 4] = (byte)(Si[(t1 >> 24) & 0xFF] ^ (tt >> 24));
dst[outOffset + 5] = (byte)(Si[(t0 >> 16) & 0xFF] ^ (tt >> 16));
dst[outOffset + 6] = (byte)(Si[(t3 >> 8) & 0xFF] ^ (tt >> 8));
dst[outOffset + 7] = (byte)(Si[ t2 & 0xFF] ^ tt );
tt = Kdr[2];
dst[outOffset + 8] = (byte)(Si[(t2 >> 24) & 0xFF] ^ (tt >> 24));
dst[outOffset + 9] = (byte)(Si[(t1 >> 16) & 0xFF] ^ (tt >> 16));
dst[outOffset +10] = (byte)(Si[(t0 >> 8) & 0xFF] ^ (tt >> 8));
dst[outOffset +11] = (byte)(Si[ t3 & 0xFF] ^ tt );
tt = Kdr[3];
dst[outOffset +12] = (byte)(Si[(t3 >> 24) & 0xFF] ^ (tt >> 24));
dst[outOffset +13] = (byte)(Si[(t2 >> 16) & 0xFF] ^ (tt >> 16));
dst[outOffset +14] = (byte)(Si[(t1 >> 8) & 0xFF] ^ (tt >> 8));
dst[outOffset +15] = (byte)(Si[ t0 & 0xFF] ^ tt );
}
/// <summary>
/// constants
/// </summary>
private const int BLOCK_SIZE = 16;
private const int BC = 4;
private static readonly int[] alog = new int[256];
private static readonly int[] log = new int[256];
private static readonly byte[] S = new byte[256];
private static readonly byte[] Si = new byte[256];
private static readonly int[] T1 = new int[256];
private static readonly int[] T2 = new int[256];
private static readonly int[] T3 = new int[256];
private static readonly int[] T4 = new int[256];
private static readonly int[] T5 = new int[256];
private static readonly int[] T6 = new int[256];
private static readonly int[] T7 = new int[256];
private static readonly int[] T8 = new int[256];
private static readonly int[] U1 = new int[256];
private static readonly int[] U2 = new int[256];
private static readonly int[] U3 = new int[256];
private static readonly int[] U4 = new int[256];
private static readonly byte[] rcon = new byte[30];
private static readonly int[,,] shifts = new int[,,] {
{ {0, 0}, {1, 3}, {2, 2}, {3, 1} },
{ {0, 0}, {1, 5}, {2, 4}, {3, 3} },
{ {0, 0}, {1, 7}, {3, 5}, {4, 4} }};
///////////////////////////////////
//class initialization
///////////////////////////////////
static Rijndael() {
int ROOT = 0x11B;
int i, j = 0;
alog[0] = 1;
for (i = 1; i < 256; i++) {
j = (alog[i-1] << 1) ^ alog[i-1];
if ((j & 0x100) != 0) j ^= ROOT;
alog[i] = j;
}
for (i = 1; i < 255; i++) log[alog[i]] = i;
byte[,] A = new byte[,] {
{1, 1, 1, 1, 1, 0, 0, 0},
{0, 1, 1, 1, 1, 1, 0, 0},
{0, 0, 1, 1, 1, 1, 1, 0},
{0, 0, 0, 1, 1, 1, 1, 1},
{1, 0, 0, 0, 1, 1, 1, 1},
{1, 1, 0, 0, 0, 1, 1, 1},
{1, 1, 1, 0, 0, 0, 1, 1},
{1, 1, 1, 1, 0, 0, 0, 1}};
byte[] B = new byte[] { 0, 1, 1, 0, 0, 0, 1, 1};
int t;
byte[,] box = new byte[256,8];
box[1,7] = 1;
for (i = 2; i < 256; i++) {
j = alog[255 - log[i]];
for (t = 0; t < 8; t++) {
box[i,t] = (byte)((j >> (7 - t)) & 0x01);
}
}
byte[,] cox = new byte[256,8];
for (i = 0; i < 256; i++) {
for (t = 0; t < 8; t++) {
cox[i,t] = B[t];
for (j = 0; j < 8; j++)
cox[i,t] ^= (byte)(A[t,j] * box[i,j]);
}
}
for (i = 0; i < 256; i++) {
S[i] = (byte)(cox[i,0] << 7);
for (t = 1; t < 8; t++)
S[i] ^= (byte)(cox[i,t] << (7-t));
Si[S[i] & 0xFF] = (byte) i;
}
byte[][] G = new byte[4][];
G[0] = new byte[] {2, 1, 1, 3};
G[1] = new byte[] {3, 2, 1, 1};
G[2] = new byte[] {1, 3, 2, 1};
G[3] = new byte[] {1, 1, 3, 2};
byte[,] AA = new byte[4,8];
for (i = 0; i < 4; i++) {
for (j = 0; j < 4; j++) AA[i,j] = G[i][j];
AA[i,i+4] = 1;
}
byte pivot, tmp;
byte[][] iG = new byte[4][];
for (i = 0; i < 4; i++)
iG[i] = new byte[4];
for (i = 0; i < 4; i++) {
pivot = AA[i,i];
if (pivot == 0) {
t = i + 1;
while ((AA[t,i] == 0) && (t < 4))
t++;
if (t != 4) {
for (j = 0; j < 8; j++) {
tmp = AA[i,j];
AA[i,j] = AA[t,j];
AA[t,j] = (byte) tmp;
}
pivot = AA[i,i];
}
}
for (j = 0; j < 8; j++)
if (AA[i,j] != 0)
AA[i,j] = (byte)
alog[(255 + log[AA[i,j] & 0xFF] - log[pivot & 0xFF]) % 255];
for (t = 0; t < 4; t++)
if (i != t) {
for (j = i+1; j < 8; j++)
AA[t,j] ^= (byte)mul(AA[i,j], AA[t,i]);
AA[t,i] = 0;
}
}
for (i = 0; i < 4; i++)
for (j = 0; j < 4; j++) iG[i][j] = AA[i,j + 4];
int s;
for (t = 0; t < 256; t++) {
s = S[t];
T1[t] = mul4(s, G[0]);
T2[t] = mul4(s, G[1]);
T3[t] = mul4(s, G[2]);
T4[t] = mul4(s, G[3]);
s = Si[t];
T5[t] = mul4(s, iG[0]);
T6[t] = mul4(s, iG[1]);
T7[t] = mul4(s, iG[2]);
T8[t] = mul4(s, iG[3]);
U1[t] = mul4(t, iG[0]);
U2[t] = mul4(t, iG[1]);
U3[t] = mul4(t, iG[2]);
U4[t] = mul4(t, iG[3]);
}
rcon[0] = 1;
int r = 1;
for (t = 1; t < 30; ) rcon[t++] = (byte)(r = mul(2, r));
}
private static int mul(int a, int b) {
return (a != 0 && b != 0) ?
alog[(log[a & 0xFF] + log[b & 0xFF]) % 255] :
0;
}
private static int mul4(int a, byte[] b) {
if (a == 0) return 0;
a = log[a & 0xFF];
int a0 = (b[0] != 0) ? alog[(a + log[b[0] & 0xFF]) % 255] & 0xFF : 0;
int a1 = (b[1] != 0) ? alog[(a + log[b[1] & 0xFF]) % 255] & 0xFF : 0;
int a2 = (b[2] != 0) ? alog[(a + log[b[2] & 0xFF]) % 255] & 0xFF : 0;
int a3 = (b[3] != 0) ? alog[(a + log[b[3] & 0xFF]) % 255] & 0xFF : 0;
return a0 << 24 | a1 << 16 | a2 << 8 | a3;
}
}
}
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