AESEncryption.cs
public class AESEncryption
{
private static byte[] _key1 = { 0x36, 0x64, 0x9A, 0xF2, 0x6D, 0xDE, 0x0C, 0x3A, 0x0F, 0x1E, 0x2D, 0x3C, 0x4B, 0x5A, 0x69, 0x78 };
public static byte[] AESEncrypt(byte[] inputByteArray)
{
SymmetricAlgorithm des = Rijndael.Create();
des.Key = _key1;
des.IV = _key1;
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
byte[] cipherBytes = ms.ToArray();
cs.Close();
ms.Close();
return cipherBytes;
}
public static byte[] AESDecrypt(byte[] cipherText)
{
SymmetricAlgorithm des = Rijndael.Create();
des.Key = _key1;
des.IV = _key1;
byte[] decryptBytes = new byte[cipherText.Length];
MemoryStream ms = new MemoryStream(cipherText);
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Read);
cs.Read(decryptBytes, 0, decryptBytes.Length);
cs.Close();
ms.Close();
return decryptBytes;
}
}
Aes.cs
public class Aes // 高级加密标准
{
public enum KeySize
{
Bits128,
Bits192,
Bits256
};
private readonly byte[] key;
private byte[,] Dbox;
private int Nb;
private int Nk;
private int Nr;
private byte[,] Rcon;
private byte[,] Sbox;
private char Source;
private byte[,] State;
private byte[,] iDbox;
private byte[,] iSbox;
private bool mode = true;
private int round;
private byte size;
private byte[,] w;
public Aes(KeySize keySize, byte[] keyBytes)
{
SetNbNkNr(keySize);
key = new byte[Nk*4];
keyBytes.CopyTo(key, 0);
BuildSbox();
BuildInvSbox();
InitdBox();
BuildRcon();
KeyExpansion();
}
private void InitdBox()
{
Dbox = new byte[16, 16];
iDbox = new byte[16, 16];
}
private void BuildDbox(byte[,] statebox, int round)
{
var Temp = new byte[16];
BuildLCS(ref Temp, round);
byte AddByte = 0, t = 0;
for (byte k = 0; k < 16; k += 2)
{
AddByte <<= 1;
t = (byte) (Temp[k] & 0x01);
AddByte |= t;
}
for (byte i = 0; i < 16; i++)
{
for (byte r = 0; r < 4; ++r)
for (byte c = 0; c < 4; Temp[r*4 + c] = w[((Nr - round)*4) + c, r], ++c) ;
for (byte j = 0; j < 16; j++)
{
byte row, col, y = 0;
Dbox[i, j] = (byte) (statebox[i, j] ^ AddByte);
row = (byte) (Dbox[i, j] >> 4);
col = (byte) (Dbox[i, j] & 0x0f);
iDbox[row, col] = (byte) (i << 4 | j);
}
}
}
private void BuildLCS(ref byte[] Data, int times)
{
for (int i = 0; i < times; i++)
{
byte temp = Data[0];
for (int j = 0; j < 15; Data[j] = Data[j + 1], j++) ;
Data[15] = temp;
}
}
public void Cipher(byte[] input, byte[] output) // 加密16位输入
{
State = new byte[4, Nb];
for (int i = 0; i < (4*Nb); ++i)
{
State[i % 4, i / 4] = input[i];
}
AddRoundKey(0);
int round;
for (round = 1; round <= (Nr - 1); ++round)
{
SubBytes(round);
ShiftRows();
MixColumns();
AddRoundKey(round);
}
SubBytes(Nr);
ShiftRows();
AddRoundKey(Nr);
for (int i = 0; i < (4*Nb); ++i)
{
output[i] = State[i%4, i/4];
}
}
public void InvCipher(byte[] input, byte[] output) // 解密16位输入
{
State = new byte[4, Nb];
for (int i = 0; i < (4*Nb); ++i)
{
State[i%4, i/4] = input[i];
}
AddRoundKey(Nr);
for (int round = Nr - 1; round >= 1; --round)
{
InvShiftRows();
InvSubBytes(round + 1);
AddRoundKey(round);
InvMixColumns();
}
InvShiftRows();
InvSubBytes(1);
AddRoundKey(0);
for (int i = 0; i < (4*Nb); ++i)
{
output[i] = State[i%4, i/4];
}
}
private void SetNbNkNr(KeySize keySize)
{
Nb = 4;
if (keySize == KeySize.Bits128)
{
Nk = 4;
Nr = 10;
}
else if (keySize == KeySize.Bits192)
{
Nk = 6;
Nr = 12;
}
else if (keySize == KeySize.Bits256)
{
Nk = 8;
Nr = 14;
}
}
private void BuildSbox()
{
Sbox = new byte[16, 16]
{
{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 void BuildInvSbox()
{
iSbox = new byte[16, 16]
{
{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 void BuildRcon()
{
Rcon = new byte[11, 4]
{
{0x00, 0x00, 0x00, 0x00},
{0x01, 0x00, 0x00, 0x00},
{0x02, 0x00, 0x00, 0x00},
{0x04, 0x00, 0x00, 0x00},
{0x08, 0x00, 0x00, 0x00},
{0x10, 0x00, 0x00, 0x00},
{0x20, 0x00, 0x00, 0x00},
{0x40, 0x00, 0x00, 0x00},
{0x80, 0x00, 0x00, 0x00},
{0x1b, 0x00, 0x00, 0x00},
{0x36, 0x00, 0x00, 0x00}
};
}
private void AddRoundKey(int round)
{
for (int r = 0; r < 4; ++r)
{
for (int c = 0; c < 4; ++c)
{
State[r, c] = (byte) (State[r, c] ^ w[(round*4) + c, r]);
}
}
}
private void SubBytes(int round)
{
if (mode)
BuildDbox(Sbox, round);
for (int r = 0; r < 4; ++r)
{
for (int c = 0; c < 4; ++c)
{
if (mode)
State[r, c] = Dbox[(State[r, c] >> 4), (State[r, c] & 0x0f)];
else
State[r, c] = Sbox[(State[r, c] >> 4), (State[r, c] & 0x0f)];
}
}
}
private void InvSubBytes(int round)
{
if (mode)
BuildDbox(Sbox, round);
for (int r = 0; r < 4; ++r)
{
for (int c = 0; c < 4; ++c)
{
if (mode)
State[r, c] = iDbox[(State[r, c] >> 4), (State[r, c] & 0x0f)];
else
State[r, c] = iSbox[(State[r, c] >> 4), (State[r, c] & 0x0f)];
}
}
}
private void ShiftRows()
{
var temp = new byte[4, 4];
for (int r = 0; r < 4; ++r)
{
for (int c = 0; c < 4; ++c)
{
temp[r, c] = State[r, c];
}
}
for (int r = 1; r < 4; ++r)
{
for (int c = 0; c < 4; ++c)
{
State[r, c] = temp[r, (c + r)%Nb];
}
}
}
private void InvShiftRows()
{
var temp = new byte[4, 4];
for (int r = 0; r < 4; ++r)
{
for (int c = 0; c < 4; ++c)
{
temp[r, c] = State[r, c];
}
}
for (int r = 1; r < 4; ++r)
{
for (int c = 0; c < 4; ++c)
{
State[r, (c + r)%Nb] = temp[r, c];
}
}
}
private void MixColumns()
{
var temp = new byte[4, 4];
for (int r = 0; r < 4; ++r)
{
for (int c = 0; c < 4; ++c)
{
temp[r, c] = State[r, c];
}
}
for (int c = 0; c < 4; ++c)
{
State[0, c] = (byte) (gfmultby02(temp[0, c]) ^ gfmultby03(temp[1, c]) ^
gfmultby01(temp[2, c]) ^ gfmultby01(temp[3, c]));
State[1, c] = (byte) (gfmultby01(temp[0, c]) ^ gfmultby02(temp[1, c]) ^
gfmultby03(temp[2, c]) ^ gfmultby01(temp[3, c]));
State[2, c] = (byte) (gfmultby01(temp[0, c]) ^ gfmultby01(temp[1, c]) ^
gfmultby02(temp[2, c]) ^ gfmultby03(temp[3, c]));
State[3, c] = (byte) (gfmultby03(temp[0, c]) ^ gfmultby01(temp[1, c]) ^
gfmultby01(temp[2, c]) ^ gfmultby02(temp[3, c]));
}
}
private void InvMixColumns()
{
var temp = new byte[4, 4];
for (int r = 0; r < 4; ++r)
{
for (int c = 0; c < 4; ++c)
{
temp[r, c] = State[r, c];
}
}
for (int c = 0; c < 4; ++c)
{
State[0, c] = (byte) (gfmultby0e(temp[0, c]) ^ gfmultby0b(temp[1, c]) ^
gfmultby0d(temp[2, c]) ^ gfmultby09(temp[3, c]));
State[1, c] = (byte) (gfmultby09(temp[0, c]) ^ gfmultby0e(temp[1, c]) ^
gfmultby0b(temp[2, c]) ^ gfmultby0d(temp[3, c]));
State[2, c] = (byte) (gfmultby0d(temp[0, c]) ^ gfmultby09(temp[1, c]) ^
gfmultby0e(temp[2, c]) ^ gfmultby0b(temp[3, c]));
State[3, c] = (byte) (gfmultby0b(temp[0, c]) ^ gfmultby0d(temp[1, c]) ^
gfmultby09(temp[2, c]) ^ gfmultby0e(temp[3, c]));
}
}
private static byte gfmultby01(byte b)
{
return b;
}
private static byte gfmultby02(byte b)
{
if (b < 0x80)
return (byte) (b << 1);
return (byte) (b << 1 ^ 0x1b);
}
private static byte gfmultby03(byte b)
{
return (byte) (gfmultby02(b) ^ b);
}
private static byte gfmultby09(byte b)
{
return (byte) (gfmultby02(gfmultby02(gfmultby02(b))) ^
b);
}
private static byte gfmultby0b(byte b)
{
return (byte) (gfmultby02(gfmultby02(gfmultby02(b))) ^
gfmultby02(b) ^
b);
}
private static byte gfmultby0d(byte b)
{
return (byte) (gfmultby02(gfmultby02(gfmultby02(b))) ^
gfmultby02(gfmultby02(b)) ^
b);
}
private static byte gfmultby0e(byte b)
{
return (byte) (gfmultby02(gfmultby02(gfmultby02(b))) ^
gfmultby02(gfmultby02(b)) ^
gfmultby02(b));
}
private void KeyExpansion()
{
w = new byte[Nb*(Nr + 1), 4];
for (int row = 0; row < Nk; ++row)
{
w[row, 0] = key[4*row];
w[row, 1] = key[4*row + 1];
w[row, 2] = key[4*row + 2];
w[row, 3] = key[4*row + 3];
}
var temp = new byte[4];
for (int row = Nk; row < Nb*(Nr + 1); ++row)
{
temp[0] = w[row - 1, 0];
temp[1] = w[row - 1, 1];
temp[2] = w[row - 1, 2];
temp[3] = w[row - 1, 3];
if (row % Nk == 0)
{
temp = SubWord(RotWord(temp));
temp[0] = (byte) (temp[0] ^ Rcon[row/Nk, 0]);
temp[1] = (byte) (temp[1] ^ Rcon[row/Nk, 1]);
temp[2] = (byte) (temp[2] ^ Rcon[row/Nk, 2]);
temp[3] = (byte) (temp[3] ^ Rcon[row/Nk, 3]);
}
else if (Nk > 6 && (row%Nk == 4))
{
temp = SubWord(temp);
}
w[row, 0] = (byte) (w[row - Nk, 0] ^ temp[0]);
w[row, 1] = (byte) (w[row - Nk, 1] ^ temp[1]);
w[row, 2] = (byte) (w[row - Nk, 2] ^ temp[2]);
w[row, 3] = (byte) (w[row - Nk, 3] ^ temp[3]);
}
}
private byte[] SubWord(byte[] word)
{
var result = new byte[4];
result[0] = Sbox[word[0] >> 4, word[0] & 0x0f];
result[1] = Sbox[word[1] >> 4, word[1] & 0x0f];
result[2] = Sbox[word[2] >> 4, word[2] & 0x0f];
result[3] = Sbox[word[3] >> 4, word[3] & 0x0f];
return result;
}
private byte[] RotWord(byte[] word)
{
var result = new byte[4];
result[0] = word[1];
result[1] = word[2];
result[2] = word[3];
result[3] = word[0];
return result;
}
public void Dump()
{
Console.WriteLine("Nb = " + Nb + " Nk = " + Nk + " Nr = " + Nr);
Console.WriteLine("\nThe key is \n" + DumpKey());
Console.WriteLine("\nThe Sbox is \n" + DumpTwoByTwo(Sbox));
Console.WriteLine("\nThe w array is \n" + DumpTwoByTwo(w));
Console.WriteLine("\nThe State array is \n" + DumpTwoByTwo(State));
}
public string DumpKey()
{
string s = "";
for (int i = 0; i < key.Length; ++i)
s += key[i].ToString("x2") + " ";
return s;
}
public string DumpTwoByTwo(byte[,] a)
{
string s = "";
for (int r = 0; r < a.GetLength(0); ++r)
{
s += "[" + r + "]" + " ";
for (int c = 0; c < a.GetLength(1); ++c)
{
s += a[r, c].ToString("x2") + " ";
}
s += "\n";
}
return s;
}
}
Program.cs
class Program
{
private static void pause()
{
Console.Write("按任意键继续 . . . ");
Console.ReadKey(true);
}
public static string ToHexString(byte[] bytes, String flag = ",")
{
string hexString = string.Empty;
if (bytes != null)
{
var strB = new StringBuilder();
for (int i = 0; i < bytes.Length; i++)
{
strB.Append(bytes[i].ToString("X2"));
strB.Append(flag);
}
hexString = strB.ToString();
}
return hexString;
}
private static void Main(string[] args)
{
byte[] inputByteArrayOne =
{
0xAA, 0x55, 0xBB, 0x66, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00
};
byte[] outputByteArrayOne = AESEncryption.AESEncrypt(inputByteArrayOne);
byte[] outputByteArrayTwo = AESEncryption.AESDecrypt(outputByteArrayOne);
Console.WriteLine("输入值 - " + ToHexString(outputByteArrayTwo));
Console.WriteLine("输出值 - " + ToHexString(outputByteArrayOne));
Console.WriteLine();
Aes.KeySize keysize;
keysize = Aes.KeySize.Bits128;
byte[] inputByteArray =
{
0xAA, 0x55, 0xBB, 0x66, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00
};
byte[] _key1 =
{
0x36, 0x64, 0x9A, 0xF2, 0x6D, 0xDE, 0x0C, 0x3A, 0x0F, 0x1E, 0x2D, 0x3C, 0x4B, 0x5A, 0x69,
0x78
};
var a = new Aes(keysize, _key1);
var outputByteArray = new byte[16];
a.Cipher(inputByteArray, outputByteArray);
var outputByteArray1 = new byte[16];
a.InvCipher(outputByteArray, outputByteArray1);
string hex2 = ToHexString(outputByteArray);
string hex1 = ToHexString(outputByteArray1);
Console.WriteLine("输入值 - " + hex1);
Console.WriteLine("输出值 - " + hex2);
pause();
}
}
运行结果如图:
