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Aes.cs
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namespace AES_Sharp
{
public class Aes
{
private static uint[][] ExpandedKey;
private static uint C0, C1, C2, C3;
private static uint BU(byte[] B, int Ofs)
{
return B[Ofs] |
(uint)B[Ofs + 1] << 8 |
(uint)B[Ofs + 2] << 16 |
(uint)B[Ofs + 3] << 24;
}
private static void BE(uint N, byte[] B, int Ofs)
{
B[Ofs] = (byte)(N);
B[Ofs + 1] = (byte)(N >> 8);
B[Ofs + 2] = (byte)(N >> 16);
B[Ofs + 3] = (byte)(N >> 24);
}
private static readonly byte[] SubBox =
{
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
};
private static readonly byte[] SubBoxInv =
{
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
};
private static readonly byte[] RoundConst =
{
0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1B, 0x36, 0x6C, 0xD8, 0xAB, 0x4D, 0x9A, 0x2F,
0x5E, 0xBC, 0x63, 0xC6, 0x97, 0x35, 0x6A, 0xD4, 0xB3, 0x7D, 0xFA, 0xEF, 0xC5, 0x91
};
private static uint Shift(uint Val, int Num)
{
return (Val >> Num) | (Val << (32 - Num));
}
private static uint MixColumns(uint X)
{
uint T0 = Shift(X, 8);
uint T1 = X ^ T0;
return Shift(T1, 16) ^ T0 ^ Mult(T1);
}
private static uint UnmixColumns(uint X)
{
var T0 = X;
var T1 = T0 ^ Shift(T0, 8);
T0 ^= Mult(T1);
T1 ^= Mult2(T0);
T0 ^= T1 ^ Shift(T1, 16);
return T0;
}
private static uint SubTransform(uint X)
{
return
SubBox[X & 0xFF] |
(uint)SubBox[(X >> 8) & 0xFF] << 8 |
(uint)SubBox[(X >> 16) & 0xFF] << 16 |
(uint)SubBox[(X >> 24) & 0xFF] << 24;
}
private static uint Mult(uint X)
{
return ((X & 0x7f7f7f7f) << 1) ^ (((X & 0x80808080) >> 7) * 27);
}
private static uint Mult2(uint X)
{
var T = X & 0xc0c0c0c0;
T ^= (T >> 1);
return ((X & 0x3f3f3f3f) << 2) ^ (T >> 2) ^ (T >> 5);
}
private static uint[][] GenWorkingKey(byte[] Key, bool Enc)
{
var KeyData = new uint[11][];
for (int i = 0; i <= 10; ++i)
{
KeyData[i] = new uint[4];
}
var T0 = BU(Key, 0); KeyData[0][0] = T0;
var T1 = BU(Key, 4); KeyData[0][1] = T1;
var T2 = BU(Key, 8); KeyData[0][2] = T2;
var T3 = BU(Key, 12); KeyData[0][3] = T3;
for (int i = 1; i <= 10; ++i)
{
var U = SubTransform(Shift(T3, 8)) ^ RoundConst[i - 1];
T0 ^= U; KeyData[i][0] = T0;
T1 ^= T0; KeyData[i][1] = T1;
T2 ^= T1; KeyData[i][2] = T2;
T3 ^= T2; KeyData[i][3] = T3;
}
if (!Enc)
{
for (int i = 1; i < 10; i++)
{
uint[] N = KeyData[i];
for (int n = 0; n < 4; n++)
{
N[n] = UnmixColumns(N[n]);
}
}
}
return KeyData;
}
private static void EncryptBlock(uint[][] KB)
{
uint[] K = KB[0];
uint T0 = C0 ^ K[0], T1 = C1 ^ K[1], T2 = C2 ^ K[2], R0, R1, R2, R3 = C3 ^ K[3], R = 1;
while (R < 9)
{
K = KB[R++];
R0 = MixColumns(SubBox[T0 & 0xFF] ^ (((uint)SubBox[(T1 >> 8) & 0xFF]) << 8) ^ (((uint)SubBox[(T2 >> 16) & 0xFF]) << 16) ^ (((uint)SubBox[(R3 >> 24) & 0xFF]) << 24)) ^ K[0];
R1 = MixColumns(SubBox[T1 & 0xFF] ^ (((uint)SubBox[(T2 >> 8) & 0xFF]) << 8) ^ (((uint)SubBox[(R3 >> 16) & 0xFF]) << 16) ^ (((uint)SubBox[(T0 >> 24) & 0xFF]) << 24)) ^ K[1];
R2 = MixColumns(SubBox[T2 & 0xFF] ^ (((uint)SubBox[(R3 >> 8) & 0xFF]) << 8) ^ (((uint)SubBox[(T0 >> 16) & 0xFF]) << 16) ^ (((uint)SubBox[(T1 >> 24) & 0xFF]) << 24)) ^ K[2];
R3 = MixColumns(SubBox[R3 & 0xFF] ^ (((uint)SubBox[(T0 >> 8) & 0xFF]) << 8) ^ (((uint)SubBox[(T1 >> 16) & 0xFF]) << 16) ^ (((uint)SubBox[(T2 >> 24) & 0xFF]) << 24)) ^ K[3];
K = KB[R++];
T0 = MixColumns(SubBox[R0 & 0xFF] ^ (((uint)SubBox[(R1 >> 8) & 0xFF]) << 8) ^ (((uint)SubBox[(R2 >> 16) & 0xFF]) << 16) ^ (((uint)SubBox[(R3 >> 24) & 0xFF]) << 24)) ^ K[0];
T1 = MixColumns(SubBox[R1 & 0xFF] ^ (((uint)SubBox[(R2 >> 8) & 0xFF]) << 8) ^ (((uint)SubBox[(R3 >> 16) & 0xFF]) << 16) ^ (((uint)SubBox[(R0 >> 24) & 0xFF]) << 24)) ^ K[1];
T2 = MixColumns(SubBox[R2 & 0xFF] ^ (((uint)SubBox[(R3 >> 8) & 0xFF]) << 8) ^ (((uint)SubBox[(R0 >> 16) & 0xFF]) << 16) ^ (((uint)SubBox[(R1 >> 24) & 0xFF]) << 24)) ^ K[2];
R3 = MixColumns(SubBox[R3 & 0xFF] ^ (((uint)SubBox[(R0 >> 8) & 0xFF]) << 8) ^ (((uint)SubBox[(R1 >> 16) & 0xFF]) << 16) ^ (((uint)SubBox[(R2 >> 24) & 0xFF]) << 24)) ^ K[3];
}
K = KB[R++];
R0 = MixColumns(SubBox[T0 & 0xFF] ^ (((uint)SubBox[(T1 >> 8) & 0xFF]) << 8) ^ (((uint)SubBox[(T2 >> 16) & 0xFF]) << 16) ^ (((uint)SubBox[(R3 >> 24) & 0xFF]) << 24)) ^ K[0];
R1 = MixColumns(SubBox[T1 & 0xFF] ^ (((uint)SubBox[(T2 >> 8) & 0xFF]) << 8) ^ (((uint)SubBox[(R3 >> 16) & 0xFF]) << 16) ^ (((uint)SubBox[(T0 >> 24) & 0xFF]) << 24)) ^ K[1];
R2 = MixColumns(SubBox[T2 & 0xFF] ^ (((uint)SubBox[(R3 >> 8) & 0xFF]) << 8) ^ (((uint)SubBox[(T0 >> 16) & 0xFF]) << 16) ^ (((uint)SubBox[(T1 >> 24) & 0xFF]) << 24)) ^ K[2];
R3 = MixColumns(SubBox[R3 & 0xFF] ^ (((uint)SubBox[(T0 >> 8) & 0xFF]) << 8) ^ (((uint)SubBox[(T1 >> 16) & 0xFF]) << 16) ^ (((uint)SubBox[(T2 >> 24) & 0xFF]) << 24)) ^ K[3];
K = KB[R];
C0 = SubBox[R0 & 0xFF] ^ (((uint)SubBox[(R1 >> 8) & 0xFF]) << 8) ^ (((uint)SubBox[(R2 >> 16) & 0xFF]) << 16) ^ (((uint)SubBox[(R3 >> 24) & 0xFF]) << 24) ^ K[0];
C1 = SubBox[R1 & 0xFF] ^ (((uint)SubBox[(R2 >> 8) & 0xFF]) << 8) ^ (((uint)SubBox[(R3 >> 16) & 0xFF]) << 16) ^ (((uint)SubBox[(R0 >> 24) & 0xFF]) << 24) ^ K[1];
C2 = SubBox[R2 & 0xFF] ^ (((uint)SubBox[(R3 >> 8) & 0xFF]) << 8) ^ (((uint)SubBox[(R0 >> 16) & 0xFF]) << 16) ^ (((uint)SubBox[(R1 >> 24) & 0xFF]) << 24) ^ K[2];
C3 = SubBox[R3 & 0xFF] ^ (((uint)SubBox[(R0 >> 8) & 0xFF]) << 8) ^ (((uint)SubBox[(R1 >> 16) & 0xFF]) << 16) ^ (((uint)SubBox[(R2 >> 24) & 0xFF]) << 24) ^ K[3];
}
private static void DecryptBlock(uint[][] KB)
{
uint[] K = KB[10];
uint T0 = C0 ^ K[0], T1 = C1 ^ K[1], T2 = C2 ^ K[2], R0, R1, R2, R3 = C3 ^ K[3], R = 9;
while (R > 1)
{
K = KB[R--];
R0 = UnmixColumns(SubBoxInv[T0 & 0xFF] ^ (((uint)SubBoxInv[(R3 >> 8) & 0xFF]) << 8) ^ (((uint)SubBoxInv[(T2 >> 16) & 0xFF]) << 16) ^ ((uint)SubBoxInv[(T1 >> 24) & 0xFF] << 24)) ^ K[0];
R1 = UnmixColumns(SubBoxInv[T1 & 0xFF] ^ (((uint)SubBoxInv[(T0 >> 8) & 0xFF]) << 8) ^ (((uint)SubBoxInv[(R3 >> 16) & 0xFF]) << 16) ^ ((uint)SubBoxInv[(T2 >> 24) & 0xFF] << 24)) ^ K[1];
R2 = UnmixColumns(SubBoxInv[T2 & 0xFF] ^ (((uint)SubBoxInv[(T1 >> 8) & 0xFF]) << 8) ^ (((uint)SubBoxInv[(T0 >> 16) & 0xFF]) << 16) ^ ((uint)SubBoxInv[(R3 >> 24) & 0xFF] << 24)) ^ K[2];
R3 = UnmixColumns(SubBoxInv[R3 & 0xFF] ^ (((uint)SubBoxInv[(T2 >> 8) & 0xFF]) << 8) ^ (((uint)SubBoxInv[(T1 >> 16) & 0xFF]) << 16) ^ ((uint)SubBoxInv[(T0 >> 24) & 0xFF] << 24)) ^ K[3];
K = KB[R--];
T0 = UnmixColumns(SubBoxInv[R0 & 0xFF] ^ (((uint)SubBoxInv[(R3 >> 8) & 0xFF]) << 8) ^ (((uint)SubBoxInv[(R2 >> 16) & 0xFF]) << 16) ^ ((uint)SubBoxInv[(R1 >> 24) & 0xFF] << 24)) ^ K[0];
T1 = UnmixColumns(SubBoxInv[R1 & 0xFF] ^ (((uint)SubBoxInv[(R0 >> 8) & 0xFF]) << 8) ^ (((uint)SubBoxInv[(R3 >> 16) & 0xFF]) << 16) ^ ((uint)SubBoxInv[(R2 >> 24) & 0xFF] << 24)) ^ K[1];
T2 = UnmixColumns(SubBoxInv[R2 & 0xFF] ^ (((uint)SubBoxInv[(R1 >> 8) & 0xFF]) << 8) ^ (((uint)SubBoxInv[(R0 >> 16) & 0xFF]) << 16) ^ ((uint)SubBoxInv[(R3 >> 24) & 0xFF] << 24)) ^ K[2];
R3 = UnmixColumns(SubBoxInv[R3 & 0xFF] ^ (((uint)SubBoxInv[(R2 >> 8) & 0xFF]) << 8) ^ (((uint)SubBoxInv[(R1 >> 16) & 0xFF]) << 16) ^ ((uint)SubBoxInv[(R0 >> 24) & 0xFF] << 24)) ^ K[3];
}
K = KB[1];
R0 = UnmixColumns(SubBoxInv[T0 & 0xFF] ^ (((uint)SubBoxInv[(R3 >> 8) & 0xFF]) << 8) ^ (((uint)SubBoxInv[(T2 >> 16) & 0xFF]) << 16) ^ ((uint)SubBoxInv[(T1 >> 24) & 0xFF] << 24)) ^ K[0];
R1 = UnmixColumns(SubBoxInv[T1 & 0xFF] ^ (((uint)SubBoxInv[(T0 >> 8) & 0xFF]) << 8) ^ (((uint)SubBoxInv[(R3 >> 16) & 0xFF]) << 16) ^ ((uint)SubBoxInv[(T2 >> 24) & 0xFF] << 24)) ^ K[1];
R2 = UnmixColumns(SubBoxInv[T2 & 0xFF] ^ (((uint)SubBoxInv[(T1 >> 8) & 0xFF]) << 8) ^ (((uint)SubBoxInv[(T0 >> 16) & 0xFF]) << 16) ^ ((uint)SubBoxInv[(R3 >> 24) & 0xFF] << 24)) ^ K[2];
R3 = UnmixColumns(SubBoxInv[R3 & 0xFF] ^ (((uint)SubBoxInv[(T2 >> 8) & 0xFF]) << 8) ^ (((uint)SubBoxInv[(T1 >> 16) & 0xFF]) << 16) ^ ((uint)SubBoxInv[(T0 >> 24) & 0xFF] << 24)) ^ K[3];
K = KB[0];
C0 = SubBoxInv[R0 & 0xFF] ^ (((uint)SubBoxInv[(R3 >> 8) & 0xFF]) << 8) ^ (((uint)SubBoxInv[(R2 >> 16) & 0xFF]) << 16) ^ (((uint)SubBoxInv[(R1 >> 24) & 0xFF]) << 24) ^ K[0];
C1 = SubBoxInv[R1 & 0xFF] ^ (((uint)SubBoxInv[(R0 >> 8) & 0xFF]) << 8) ^ (((uint)SubBoxInv[(R3 >> 16) & 0xFF]) << 16) ^ (((uint)SubBoxInv[(R2 >> 24) & 0xFF]) << 24) ^ K[1];
C2 = SubBoxInv[R2 & 0xFF] ^ (((uint)SubBoxInv[(R1 >> 8) & 0xFF]) << 8) ^ (((uint)SubBoxInv[(R0 >> 16) & 0xFF]) << 16) ^ (((uint)SubBoxInv[(R3 >> 24) & 0xFF]) << 24) ^ K[2];
C3 = SubBoxInv[R3 & 0xFF] ^ (((uint)SubBoxInv[(R2 >> 8) & 0xFF]) << 8) ^ (((uint)SubBoxInv[(R1 >> 16) & 0xFF]) << 16) ^ (((uint)SubBoxInv[(R0 >> 24) & 0xFF]) << 24) ^ K[3];
}
private static void ProcessBlock(byte[] Input, int InOffset, byte[] Output, int OutOffset, bool Enc)
{
C0 = BU(Input, InOffset);
C1 = BU(Input, InOffset + 4);
C2 = BU(Input, InOffset + 8);
C3 = BU(Input, InOffset + 12);
if (Enc) EncryptBlock(ExpandedKey);
else DecryptBlock(ExpandedKey);
BE(C0, Output, OutOffset);
BE(C1, Output, OutOffset + 4);
BE(C2, Output, OutOffset + 8);
BE(C3, Output, OutOffset + 12);
}
public static byte[] ECB(byte[] Key, byte[] Input, bool Enc)
{
var Buf = new byte[Input.Length];
ExpandedKey = GenWorkingKey(Key, Enc);
for (int i = 0; i < Input.Length; i += Key.Length)
{
ProcessBlock(Input, i, Buf, i, Enc);
}
return Buf;
}
public static byte[] CTR(byte[] Key, byte[] IV, byte[] Input)
{
var Buf = new byte[Input.Length];
var KeyBuf = new byte[16];
ExpandedKey = GenWorkingKey(Key, true);
void Increment(byte[] Val)
{
int Pos = 16;
while (--Pos >= 0 && ++Val[Pos] == 0) { }
}
for (int i = 0; i < Input.Length; i += 16)
{
ProcessBlock(IV, 0, KeyBuf, 0, true);
for (int j = 0; j < 16; j++)
{
Buf[i + j] = (byte)(KeyBuf[j] ^ Input[i + j]);
}
Increment(IV);
}
return Buf;
}
}
}