AES加密/解密的实现 - 不使用图书馆

Question

我想实现一个AES系统C＃加密，并使用AES 解密消息。加密消息的解密消息与原始文本不同。

我哪里错了？ PS：我已经包含state.cs类，其中包含mixcolumns，subbytes和shiftrow方法以及这些方法的逆向函数。

private byte[] readHexString(string s) 
     { 
      int size = s.Length/2; 
      byte[] b = new byte[size]; 

      if ((size != 16) && (size != 24) && (size != 32)) 
      { 
       throw new Exception(); 
      } 

      for (int i = 0; i < size; i++) 
      { 
       b[i] = Convert.ToByte(s.Substring(2 * i, 2), 16); 
      } 
      return (b); 
     } 

     private byte[] readAsciiString(string s) 
     { 
      byte[] b = new byte[s.Length]; 
      b = System.Text.ASCIIEncoding.ASCII.GetBytes(s); 
      return (b); 
     } 

     private void btnTest_Click(object sender, EventArgs e) 
     { 
      byte[] inputKey = readHexString(tbKey.Text); 
      Key key = new Key(inputKey); 
      Console.Out.WriteLine("\nkey:\n" + key); 

      byte[] inputPlain = readAsciiString(tbPlain.Text); 
      State inputState = new State(inputPlain); 

      Console.Out.WriteLine("state:\n" + inputState.ToMatrixString()); 

      //string outplain = ConvertHex(Encrypt(inputState, key)); 
      string ciphertext = Encrypt(inputState, key); 
      tbCiphertext.Text = ciphertext; 


      byte[] inputPlain2 = readAsciiString(tbCiphertext.Text); 
      State inputState2 = new State(inputPlain2); 
      string plaintext = Decrypt(inputState2, key); 
      Console.Out.WriteLine(plaintext); 

     } 

     private string Encrypt(State _inputState, Key k) 
     { 
      //string ciphertext; 
      byte[] ciphertext; 

      State thisState = _inputState; 
      thisState = thisState.addRoundKey(k, 0); 
      Console.Out.WriteLine(thisState.ToString()); 
      for (int i = 1; i < 10; i++) 
      { 
       thisState = thisState.subBytes(); 
       thisState = thisState.shiftRows(); 
       thisState = thisState.mixColumns(); 
       thisState = thisState.addRoundKey(k, i); 
       Console.Out.WriteLine(thisState.ToString()); 
      } 

      thisState = thisState.subBytes(); 
      thisState = thisState.shiftRows(); 
      thisState = thisState.addRoundKey(k, 10); 

      Console.Out.WriteLine(thisState.ToString()); 

      ciphertext = readHexString(thisState.ToString()); 
      string output = ""; 
      for (int i = 0; i < ciphertext.Length; i++) 
      { 
       output += ciphertext[i]; 
      } 

      return ConvertHex(output); 
     } 

     public string Decrypt(State state, Key k) 
     { 
      byte[] plainText; 
      State thisState = state.addRoundKey(k, 10); 
      thisState = thisState.shiftRowsInv(); 
      thisState = thisState.subBytesInv(); 


      for (int i = 9; i > 0; i--) 
      { 
       thisState = thisState.addRoundKey(k, i); 
       thisState = thisState.mixColumnsInv(); 
       thisState = thisState.shiftRowsInv(); 
       thisState = thisState.subBytesInv(); 
      } 
      thisState = thisState.addRoundKey(k, 0); 
      plainText = readHexString(thisState.ToString()); 
      string output = ""; 
      for (int i = 0; i < plainText.Length; i++) 
      { 
       output += plainText[i]; 
      } 
      Console.Out.WriteLine(ConvertHex(output)); 
      return ConvertHex(output); 

     } 
     public string ConvertHex(String hexString) 
     { 
      StringBuilder sb = new StringBuilder(); 
      for (int i = 0; i <= hexString.Length - 2; i += 2) 
      { 
       sb.Append(Convert.ToString(Convert.ToChar(Int32.Parse(hexString.Substring(i, 2), System.Globalization.NumberStyles.HexNumber)))); 
      } 
      return sb.ToString(); 
     } 
    } 
} 


namespace Aes 
{ 
    public class State 
    { 
     private const int nrofRow = 4; 
     private const int nrofCol = 4; 
     private byte[,] buf; 
     //multiplication tables taken from http://en.wikipedia.org/wiki/Rijndael_mix_columns 
     private static byte[] mul2 = { 
      0x00,0x02,0x04,0x06,0x08,0x0a,0x0c,0x0e,0x10,0x12,0x14,0x16,0x18,0x1a,0x1c,0x1e, 
      0x20,0x22,0x24,0x26,0x28,0x2a,0x2c,0x2e,0x30,0x32,0x34,0x36,0x38,0x3a,0x3c,0x3e, 
      0x40,0x42,0x44,0x46,0x48,0x4a,0x4c,0x4e,0x50,0x52,0x54,0x56,0x58,0x5a,0x5c,0x5e, 
      0x60,0x62,0x64,0x66,0x68,0x6a,0x6c,0x6e,0x70,0x72,0x74,0x76,0x78,0x7a,0x7c,0x7e, 
      0x80,0x82,0x84,0x86,0x88,0x8a,0x8c,0x8e,0x90,0x92,0x94,0x96,0x98,0x9a,0x9c,0x9e, 
      0xa0,0xa2,0xa4,0xa6,0xa8,0xaa,0xac,0xae,0xb0,0xb2,0xb4,0xb6,0xb8,0xba,0xbc,0xbe, 
      0xc0,0xc2,0xc4,0xc6,0xc8,0xca,0xcc,0xce,0xd0,0xd2,0xd4,0xd6,0xd8,0xda,0xdc,0xde, 
      0xe0,0xe2,0xe4,0xe6,0xe8,0xea,0xec,0xee,0xf0,0xf2,0xf4,0xf6,0xf8,0xfa,0xfc,0xfe, 
      0x1b,0x19,0x1f,0x1d,0x13,0x11,0x17,0x15,0x0b,0x09,0x0f,0x0d,0x03,0x01,0x07,0x05, 
      0x3b,0x39,0x3f,0x3d,0x33,0x31,0x37,0x35,0x2b,0x29,0x2f,0x2d,0x23,0x21,0x27,0x25, 
      0x5b,0x59,0x5f,0x5d,0x53,0x51,0x57,0x55,0x4b,0x49,0x4f,0x4d,0x43,0x41,0x47,0x45, 
      0x7b,0x79,0x7f,0x7d,0x73,0x71,0x77,0x75,0x6b,0x69,0x6f,0x6d,0x63,0x61,0x67,0x65, 
      0x9b,0x99,0x9f,0x9d,0x93,0x91,0x97,0x95,0x8b,0x89,0x8f,0x8d,0x83,0x81,0x87,0x85, 
      0xbb,0xb9,0xbf,0xbd,0xb3,0xb1,0xb7,0xb5,0xab,0xa9,0xaf,0xad,0xa3,0xa1,0xa7,0xa5, 
      0xdb,0xd9,0xdf,0xdd,0xd3,0xd1,0xd7,0xd5,0xcb,0xc9,0xcf,0xcd,0xc3,0xc1,0xc7,0xc5, 
      0xfb,0xf9,0xff,0xfd,0xf3,0xf1,0xf7,0xf5,0xeb,0xe9,0xef,0xed,0xe3,0xe1,0xe7,0xe5 
     }; 

     private static byte[] mul3 = { 
      0x00,0x03,0x06,0x05,0x0c,0x0f,0x0a,0x09,0x18,0x1b,0x1e,0x1d,0x14,0x17,0x12,0x11, 
      0x30,0x33,0x36,0x35,0x3c,0x3f,0x3a,0x39,0x28,0x2b,0x2e,0x2d,0x24,0x27,0x22,0x21, 
      0x60,0x63,0x66,0x65,0x6c,0x6f,0x6a,0x69,0x78,0x7b,0x7e,0x7d,0x74,0x77,0x72,0x71, 
      0x50,0x53,0x56,0x55,0x5c,0x5f,0x5a,0x59,0x48,0x4b,0x4e,0x4d,0x44,0x47,0x42,0x41, 
      0xc0,0xc3,0xc6,0xc5,0xcc,0xcf,0xca,0xc9,0xd8,0xdb,0xde,0xdd,0xd4,0xd7,0xd2,0xd1, 
      0xf0,0xf3,0xf6,0xf5,0xfc,0xff,0xfa,0xf9,0xe8,0xeb,0xee,0xed,0xe4,0xe7,0xe2,0xe1, 
      0xa0,0xa3,0xa6,0xa5,0xac,0xaf,0xaa,0xa9,0xb8,0xbb,0xbe,0xbd,0xb4,0xb7,0xb2,0xb1, 
      0x90,0x93,0x96,0x95,0x9c,0x9f,0x9a,0x99,0x88,0x8b,0x8e,0x8d,0x84,0x87,0x82,0x81, 
      0x9b,0x98,0x9d,0x9e,0x97,0x94,0x91,0x92,0x83,0x80,0x85,0x86,0x8f,0x8c,0x89,0x8a, 
      0xab,0xa8,0xad,0xae,0xa7,0xa4,0xa1,0xa2,0xb3,0xb0,0xb5,0xb6,0xbf,0xbc,0xb9,0xba, 
      0xfb,0xf8,0xfd,0xfe,0xf7,0xf4,0xf1,0xf2,0xe3,0xe0,0xe5,0xe6,0xef,0xec,0xe9,0xea, 
      0xcb,0xc8,0xcd,0xce,0xc7,0xc4,0xc1,0xc2,0xd3,0xd0,0xd5,0xd6,0xdf,0xdc,0xd9,0xda, 
      0x5b,0x58,0x5d,0x5e,0x57,0x54,0x51,0x52,0x43,0x40,0x45,0x46,0x4f,0x4c,0x49,0x4a, 
      0x6b,0x68,0x6d,0x6e,0x67,0x64,0x61,0x62,0x73,0x70,0x75,0x76,0x7f,0x7c,0x79,0x7a, 
      0x3b,0x38,0x3d,0x3e,0x37,0x34,0x31,0x32,0x23,0x20,0x25,0x26,0x2f,0x2c,0x29,0x2a, 
      0x0b,0x08,0x0d,0x0e,0x07,0x04,0x01,0x02,0x13,0x10,0x15,0x16,0x1f,0x1c,0x19,0x1a 
     }; 

     private static byte[] mul09 = { 
      0x00,0x09,0x12,0x1b,0x24,0x2d,0x36,0x3f,0x48,0x41,0x5a,0x53,0x6c,0x65,0x7e,0x77, 
      0x90,0x99,0x82,0x8b,0xb4,0xbd,0xa6,0xaf,0xd8,0xd1,0xca,0xc3,0xfc,0xf5,0xee,0xe7, 
      0x3b,0x32,0x29,0x20,0x1f,0x16,0x0d,0x04,0x73,0x7a,0x61,0x68,0x57,0x5e,0x45,0x4c, 
      0xab,0xa2,0xb9,0xb0,0x8f,0x86,0x9d,0x94,0xe3,0xea,0xf1,0xf8,0xc7,0xce,0xd5,0xdc, 
      0x76,0x7f,0x64,0x6d,0x52,0x5b,0x40,0x49,0x3e,0x37,0x2c,0x25,0x1a,0x13,0x08,0x01, 
      0xe6,0xef,0xf4,0xfd,0xc2,0xcb,0xd0,0xd9,0xae,0xa7,0xbc,0xb5,0x8a,0x83,0x98,0x91, 
      0x4d,0x44,0x5f,0x56,0x69,0x60,0x7b,0x72,0x05,0x0c,0x17,0x1e,0x21,0x28,0x33,0x3a, 
      0xdd,0xd4,0xcf,0xc6,0xf9,0xf0,0xeb,0xe2,0x95,0x9c,0x87,0x8e,0xb1,0xb8,0xa3,0xaa, 
      0xec,0xe5,0xfe,0xf7,0xc8,0xc1,0xda,0xd3,0xa4,0xad,0xb6,0xbf,0x80,0x89,0x92,0x9b, 
      0x7c,0x75,0x6e,0x67,0x58,0x51,0x4a,0x43,0x34,0x3d,0x26,0x2f,0x10,0x19,0x02,0x0b, 
      0xd7,0xde,0xc5,0xcc,0xf3,0xfa,0xe1,0xe8,0x9f,0x96,0x8d,0x84,0xbb,0xb2,0xa9,0xa0, 
      0x47,0x4e,0x55,0x5c,0x63,0x6a,0x71,0x78,0x0f,0x06,0x1d,0x14,0x2b,0x22,0x39,0x30, 
      0x9a,0x93,0x88,0x81,0xbe,0xb7,0xac,0xa5,0xd2,0xdb,0xc0,0xc9,0xf6,0xff,0xe4,0xed, 
      0x0a,0x03,0x18,0x11,0x2e,0x27,0x3c,0x35,0x42,0x4b,0x50,0x59,0x66,0x6f,0x74,0x7d, 
      0xa1,0xa8,0xb3,0xba,0x85,0x8c,0x97,0x9e,0xe9,0xe0,0xfb,0xf2,0xcd,0xc4,0xdf,0xd6, 
      0x31,0x38,0x23,0x2a,0x15,0x1c,0x07,0x0e,0x79,0x70,0x6b,0x62,0x5d,0x54,0x4f,0x46 
     }; 

     private static byte[] mul11 = { 
      0x00,0x0b,0x16,0x1d,0x2c,0x27,0x3a,0x31,0x58,0x53,0x4e,0x45,0x74,0x7f,0x62,0x69, 
      0xb0,0xbb,0xa6,0xad,0x9c,0x97,0x8a,0x81,0xe8,0xe3,0xfe,0xf5,0xc4,0xcf,0xd2,0xd9, 
      0x7b,0x70,0x6d,0x66,0x57,0x5c,0x41,0x4a,0x23,0x28,0x35,0x3e,0x0f,0x04,0x19,0x12, 
      0xcb,0xc0,0xdd,0xd6,0xe7,0xec,0xf1,0xfa,0x93,0x98,0x85,0x8e,0xbf,0xb4,0xa9,0xa2, 
      0xf6,0xfd,0xe0,0xeb,0xda,0xd1,0xcc,0xc7,0xae,0xa5,0xb8,0xb3,0x82,0x89,0x94,0x9f, 
      0x46,0x4d,0x50,0x5b,0x6a,0x61,0x7c,0x77,0x1e,0x15,0x08,0x03,0x32,0x39,0x24,0x2f, 
      0x8d,0x86,0x9b,0x90,0xa1,0xaa,0xb7,0xbc,0xd5,0xde,0xc3,0xc8,0xf9,0xf2,0xef,0xe4, 
      0x3d,0x36,0x2b,0x20,0x11,0x1a,0x07,0x0c,0x65,0x6e,0x73,0x78,0x49,0x42,0x5f,0x54, 
      0xf7,0xfc,0xe1,0xea,0xdb,0xd0,0xcd,0xc6,0xaf,0xa4,0xb9,0xb2,0x83,0x88,0x95,0x9e, 
      0x47,0x4c,0x51,0x5a,0x6b,0x60,0x7d,0x76,0x1f,0x14,0x09,0x02,0x33,0x38,0x25,0x2e, 
      0x8c,0x87,0x9a,0x91,0xa0,0xab,0xb6,0xbd,0xd4,0xdf,0xc2,0xc9,0xf8,0xf3,0xee,0xe5, 
      0x3c,0x37,0x2a,0x21,0x10,0x1b,0x06,0x0d,0x64,0x6f,0x72,0x79,0x48,0x43,0x5e,0x55, 
      0x01,0x0a,0x17,0x1c,0x2d,0x26,0x3b,0x30,0x59,0x52,0x4f,0x44,0x75,0x7e,0x63,0x68, 
      0xb1,0xba,0xa7,0xac,0x9d,0x96,0x8b,0x80,0xe9,0xe2,0xff,0xf4,0xc5,0xce,0xd3,0xd8, 
      0x7a,0x71,0x6c,0x67,0x56,0x5d,0x40,0x4b,0x22,0x29,0x34,0x3f,0x0e,0x05,0x18,0x13, 
      0xca,0xc1,0xdc,0xd7,0xe6,0xed,0xf0,0xfb,0x92,0x99,0x84,0x8f,0xbe,0xb5,0xa8,0xa3 
      }; 

     private static byte[] mul13 = { 
      0x00,0x0d,0x1a,0x17,0x34,0x39,0x2e,0x23,0x68,0x65,0x72,0x7f,0x5c,0x51,0x46,0x4b, 
      0xd0,0xdd,0xca,0xc7,0xe4,0xe9,0xfe,0xf3,0xb8,0xb5,0xa2,0xaf,0x8c,0x81,0x96,0x9b, 
      0xbb,0xb6,0xa1,0xac,0x8f,0x82,0x95,0x98,0xd3,0xde,0xc9,0xc4,0xe7,0xea,0xfd,0xf0, 
      0x6b,0x66,0x71,0x7c,0x5f,0x52,0x45,0x48,0x03,0x0e,0x19,0x14,0x37,0x3a,0x2d,0x20, 
      0x6d,0x60,0x77,0x7a,0x59,0x54,0x43,0x4e,0x05,0x08,0x1f,0x12,0x31,0x3c,0x2b,0x26, 
      0xbd,0xb0,0xa7,0xaa,0x89,0x84,0x93,0x9e,0xd5,0xd8,0xcf,0xc2,0xe1,0xec,0xfb,0xf6, 
      0xd6,0xdb,0xcc,0xc1,0xe2,0xef,0xf8,0xf5,0xbe,0xb3,0xa4,0xa9,0x8a,0x87,0x90,0x9d, 
      0x06,0x0b,0x1c,0x11,0x32,0x3f,0x28,0x25,0x6e,0x63,0x74,0x79,0x5a,0x57,0x40,0x4d, 
      0xda,0xd7,0xc0,0xcd,0xee,0xe3,0xf4,0xf9,0xb2,0xbf,0xa8,0xa5,0x86,0x8b,0x9c,0x91, 
      0x0a,0x07,0x10,0x1d,0x3e,0x33,0x24,0x29,0x62,0x6f,0x78,0x75,0x56,0x5b,0x4c,0x41, 
      0x61,0x6c,0x7b,0x76,0x55,0x58,0x4f,0x42,0x09,0x04,0x13,0x1e,0x3d,0x30,0x27,0x2a, 
      0xb1,0xbc,0xab,0xa6,0x85,0x88,0x9f,0x92,0xd9,0xd4,0xc3,0xce,0xed,0xe0,0xf7,0xfa, 
      0xb7,0xba,0xad,0xa0,0x83,0x8e,0x99,0x94,0xdf,0xd2,0xc5,0xc8,0xeb,0xe6,0xf1,0xfc, 
      0x67,0x6a,0x7d,0x70,0x53,0x5e,0x49,0x44,0x0f,0x02,0x15,0x18,0x3b,0x36,0x21,0x2c, 
      0x0c,0x01,0x16,0x1b,0x38,0x35,0x22,0x2f,0x64,0x69,0x7e,0x73,0x50,0x5d,0x4a,0x47, 
      0xdc,0xd1,0xc6,0xcb,0xe8,0xe5,0xf2,0xff,0xb4,0xb9,0xae,0xa3,0x80,0x8d,0x9a,0x97 
     }; 

     private static byte[] mul14 = { 
      0x00,0x0e,0x1c,0x12,0x38,0x36,0x24,0x2a,0x70,0x7e,0x6c,0x62,0x48,0x46,0x54,0x5a, 
      0xe0,0xee,0xfc,0xf2,0xd8,0xd6,0xc4,0xca,0x90,0x9e,0x8c,0x82,0xa8,0xa6,0xb4,0xba, 
      0xdb,0xd5,0xc7,0xc9,0xe3,0xed,0xff,0xf1,0xab,0xa5,0xb7,0xb9,0x93,0x9d,0x8f,0x81, 
      0x3b,0x35,0x27,0x29,0x03,0x0d,0x1f,0x11,0x4b,0x45,0x57,0x59,0x73,0x7d,0x6f,0x61, 
      0xad,0xa3,0xb1,0xbf,0x95,0x9b,0x89,0x87,0xdd,0xd3,0xc1,0xcf,0xe5,0xeb,0xf9,0xf7, 
      0x4d,0x43,0x51,0x5f,0x75,0x7b,0x69,0x67,0x3d,0x33,0x21,0x2f,0x05,0x0b,0x19,0x17, 
      0x76,0x78,0x6a,0x64,0x4e,0x40,0x52,0x5c,0x06,0x08,0x1a,0x14,0x3e,0x30,0x22,0x2c, 
      0x96,0x98,0x8a,0x84,0xae,0xa0,0xb2,0xbc,0xe6,0xe8,0xfa,0xf4,0xde,0xd0,0xc2,0xcc, 
      0x41,0x4f,0x5d,0x53,0x79,0x77,0x65,0x6b,0x31,0x3f,0x2d,0x23,0x09,0x07,0x15,0x1b, 
      0xa1,0xaf,0xbd,0xb3,0x99,0x97,0x85,0x8b,0xd1,0xdf,0xcd,0xc3,0xe9,0xe7,0xf5,0xfb, 
      0x9a,0x94,0x86,0x88,0xa2,0xac,0xbe,0xb0,0xea,0xe4,0xf6,0xf8,0xd2,0xdc,0xce,0xc0, 
      0x7a,0x74,0x66,0x68,0x42,0x4c,0x5e,0x50,0x0a,0x04,0x16,0x18,0x32,0x3c,0x2e,0x20, 
      0xec,0xe2,0xf0,0xfe,0xd4,0xda,0xc8,0xc6,0x9c,0x92,0x80,0x8e,0xa4,0xaa,0xb8,0xb6, 
      0x0c,0x02,0x10,0x1e,0x34,0x3a,0x28,0x26,0x7c,0x72,0x60,0x6e,0x44,0x4a,0x58,0x56, 
      0x37,0x39,0x2b,0x25,0x0f,0x01,0x13,0x1d,0x47,0x49,0x5b,0x55,0x7f,0x71,0x63,0x6d, 
      0xd7,0xd9,0xcb,0xc5,0xef,0xe1,0xf3,0xfd,0xa7,0xa9,0xbb,0xb5,0x9f,0x91,0x83,0x8d 
     }; 


     private State() 
     { 
      buf = new byte[nrofRow, nrofCol]; 
      for (int i = 0; i < nrofRow; i++) 
      { 
       for (int j = 0; j < nrofCol; j++) 
       { 
        buf[i, j] = 0; 
       } 
      } 
     } 

     public State(byte[] b) 
     { 
      buf = new byte[nrofRow, nrofCol]; 
      for (int i = 0; i < nrofRow; i++) 
      { 
       for (int j = 0; j < nrofCol; j++) 
       { 
        buf[i, j] = b[i + (nrofRow * j)]; 
       } 
      } 
     } 

     public State subBytes() 
     { 
      State s = new State(); 

      for (int i = 0; i < nrofRow; i++) 
      { 
       for (int j = 0; j < nrofCol; j++) 
       { 
        s.buf[i, j] = Sbox.sbox[buf[i, j]]; 
        //Console.Out.WriteLine("state[" + i + "," + j + "]=" + buf[i, j] + "--->" + s.buf[i, j]); 
       } 
      } 
      return (s); 
     } 

     public State shiftRows() 
     { 
      State s = new State(); 

      for (int i = 0; i < nrofRow; i++) 
      { 
       for (int j = 0; j < nrofCol; j++) 
       { 
        s.buf[i, j] = buf[i, (i + j) % 4]; 
        //Console.Out.WriteLine("state[" + i + "," + j + "]=" + s.buf[i, j]); 
       } 
      } 
      return (s); 
     } 

     public State mixColumns() 
     { 
      State s = new State(); 
      for (int c = 0; c < nrofCol; c++) 
      { 
       s.buf[0, c] = (byte)(mul2[buf[0, c]]^mul3[buf[1, c]]^buf[2, c]^buf[3, c]); 
       s.buf[1, c] = (byte)(buf[0, c]^mul2[buf[1, c]]^mul3[buf[2, c]]^buf[3, c]); 
       s.buf[2, c] = (byte)(buf[0, c]^buf[1, c]^mul2[buf[2, c]]^mul3[buf[3, c]]); 
       s.buf[3, c] = (byte)(mul3[buf[0, c]]^buf[1, c]^buf[2, c]^mul2[buf[3, c]]); 
      } 
      return (s); 
     } 

     public State subBytesInv() 
     { 
      // TODO 
      State s = new State(); 
      for (int i = 0; i < nrofRow; i++) 
      { 
       for (int j = 0; j < nrofCol; j++) 
       { 
        s.buf[i, j] = Sbox.sboxInv[buf[i, j]]; 
        //Console.Out.WriteLine("state[" + i + "," + j + "]=" + buf[i, j] + "--->" + s.buf[i, j]); 
       } 
      } 
      return (s); 
      } 

     public State shiftRowsInv() 
     { 
      State s = new State(); 


      for (int i = 0; i < nrofRow; i++) 
      { 
       for (int j = 0; j < nrofCol; j++) 
       { 
        s.buf[i, j] = buf[i, (j - i + 4) % 4]; 
        // Console.Out.WriteLine("state[" + i + "," + j + "]=" + s.buf[i, j]); 
       } 
      } 
      return (s); 
     } 

     public State mixColumnsInv() 
     { 
      State s = new State(); 
      for (int c = 0; c < nrofCol; c++) 
      { 
       s.buf[0, c] = (byte)(mul14[buf[0, c]]^mul11[buf[1, c]]^mul13[buf[2, c]]^mul09[buf[3, c]]); 
       s.buf[1, c] = (byte)(mul09[buf[0, c]]^mul14[buf[1, c]]^mul11[buf[2, c]]^mul13[buf[3, c]]); 
       s.buf[2, c] = (byte)(mul13[buf[0, c]]^mul09[buf[1, c]]^mul14[buf[2, c]]^mul11[buf[3, c]]); 
       s.buf[3, c] = (byte)(mul11[buf[0, c]]^mul13[buf[1, c]]^mul09[buf[2, c]]^mul14[buf[3, c]]); 
      } 
      return (s); 
     } 

     public State addRoundKey(Key key, int round) 
     { 
      State s = new State(); 
      for (int c = 0; c < nrofCol; c++) 
      { 
       for (int r = 0; r < nrofRow; r++) 
       { 
        s.buf[r, c] = (byte)(buf[r, c]^key.w[r, c + 4 * round]); 
        //Console.Out.WriteLine("state[" + r + "," + c + "]=" + buf[r, c] + " XOR " + key.w[r, c + 4 * round] + " = " + s.buf[r, c]); 
       } 
      } 
      return (s); 
     } 

     public string ToMatrixString() 
     { 
      string s = ""; 
      for (int i = 0; i < buf.GetLength(0); i++) 
      { 
       for (int j = 0; j < buf.GetLength(1); j++) 
       { 
        s += buf[i, j].ToString("X2") + " "; 
       } 
       s += "\n"; 
      } 
      return (s); 
     } 

     public override string ToString() 
     { 
      string s = ""; 
      for (int i = 0; i < buf.GetLength(1); i++) 
      { 
       for (int j = 0; j < buf.GetLength(0); j++) 
       { 
        s += buf[j, i].ToString("X2") + ""; 
       } 
      }`enter code here` 
      return (s); 
     } 
    } 
} 

Answer 1

这是相当困难检查什么是你的代码的错误，特别是当你的一些方法（尤其是在你State）不可查。

在这里，我可以提供我自己编写并确认可以工作的AES128.cs代码。你可以看看并比较一下，特别是像mixColumn，shiftRow和sBox这样的中间方法。人们经常在那里错了 - 包括我在我编码的时候。

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 

namespace Cryptography { 
    public class AES128 { 
    public const int BLOCK_SIZE = (128/8); 
    public const int KEY_SIZE = (128/8); 
    public const int ROUND_NO = 10; 

    // forward sbox 
    private readonly byte[] sBox = new byte[256] { 
    //0  1 2  3  4 5  6  7  8 9  A  B C  D  E  F 
    0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, //0 
    0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, //1 
    0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, //2 
    0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, //3 
    0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, //4 
    0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf, //5 
    0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, //6 
    0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, //7 
    0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, //8 
    0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, //9 
    0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, //A 
    0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, //B 
    0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, //C 
    0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, //D 
    0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, //E 
    0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 }; //F 


    private readonly byte[] inverseSBox = new byte[256] { 
    //0  1 2  3  4 5  6  7  8 9  A  B C  D  E  F 
    0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB, //0 
    0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB, //1 
    0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E, //2 
    0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25, //3 
    0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92, //4 
    0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA, 0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84, //5 
    0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A, 0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06, //6 
    0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B, //7 
    0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73, //8 
    0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E, //9 
    0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B, //A 
    0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4, //B 
    0x1F, 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F, //C 
    0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF, //D 
    0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61, //E 
    0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, 0x26, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D }; //F 

    // round coefficients 
    private readonly byte[] roundCoefficient = new byte[ROUND_NO] { 
    0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36 }; //Round coefficient is 10, the number of key is 11 

    // keys 
    private byte[] key = new byte[KEY_SIZE] { 0x09, 0x15, 0x00, 0x97, 0x00, 0x12, 0x10, 0x13, 0x03, 0x02, 0x19, 0x02, 0x05, 0x00, 0x29, 0x80 }; 
    private byte[][] subkeys = new byte[ROUND_NO + 1][]; //each subkey is 16-bytes length 
    public byte[] Key { 
     get { return key; } 
     set { //When key is set, subkeys are automatically generated 
     if (value == null || value.Length != KEY_SIZE) 
      return; 
     key = value;   
     Array.Copy(key, subkeys[0], KEY_SIZE); 
     for (int i = 0; i < ROUND_NO; ++i) {   
      Array.Copy(subkeys[i], subkeys[i + 1], KEY_SIZE); 
      keyTransform(subkeys[i + 1], i); 
     } 
     } 
    } 

    public byte[][] Subkeys { get { return subkeys; } } 

    public AES128(byte[] key = null) { 
     for (int i = 0; i < ROUND_NO + 1; ++i) 
     subkeys[i] = new byte[KEY_SIZE]; //All the necessary array size for this subkey is made at the beginning 
     Key = key != null && key.Length == KEY_SIZE ? key : this.key; //key/default key 
    } 

    private void keywordTransform (ref byte[] keyword, int roundno) { //round no starts from 0, ends at 9 
     if (roundno < 0 || roundno > ROUND_NO - 1) 
     return; 
     byte buf = keyword[0]; 
     keyword[0] = (byte)(sBox[keyword[1]]^roundCoefficient[roundno]); 
     keyword[1] = sBox[keyword[2]]; 
     keyword[2] = sBox[keyword[3]]; 
     keyword[3] = sBox[buf]; 
    } 

    private void keyTransform(byte[] key, int roundno) { 
     byte[] keyword = new byte[4]; 
     Array.Copy(key, 12, keyword, 0, 4); 
     keywordTransform(ref keyword, roundno); 
     for (int k = 0; k < 4; ++k) 
     key[k] ^= keyword[k]; 
     for (int i = 0; i < KEY_SIZE - 4; ++i) 
     key[i + 4] ^= key[i]; 
    } 

    public const byte BYTE_POLY_REDUCTION = 0x1b; 
    public const ushort POLY_REDUCTION = 0x11b; 
    private void shiftRows(ref byte[] text) { 
     byte buf; 
     //shift row 2 (1 -> 13, 5 -> 1, 9 -> 5, 13 -> 9) 
     buf = text[1]; 
     text[1] = text[5]; 
     text[5] = text[9]; 
     text[9] = text[13]; 
     text[13] = buf; 

     //shift row 3 (2 -> 10, 6 -> 14, 10 -> 2, 14 -> 6) 
     buf = text[2]; 
     text[2] = text[10]; 
     text[10] = buf; 
     buf = text[6]; 
     text[6] = text[14]; 
     text[14] = buf; 

     //shift row 4 (3 -> 7, 7 -> 11, 11 -> 15, 15 -> 3) 
     buf = text[15]; 
     text[15] = text[11]; 
     text[11] = text[7]; 
     text[7] = text[3]; 
     text[3] = buf; 
    } 

    private void inverseShiftRows(ref byte[] text) { 
     byte buf; 
     //inverse shift row 2 (1 -> 5, 5 -> 9, 9 -> 13, 13 -> 1) 
     buf = text[1]; 
     text[1] = text[13]; 
     text[13] = text[9]; 
     text[9] = text[5]; 
     text[5] = buf; 

     //inverse shift row 3 (2 -> 10, 6 -> 14, 10 -> 2, 14 -> 6) 
     buf = text[2]; 
     text[2] = text[10]; 
     text[10] = buf; 
     buf = text[6]; 
     text[6] = text[14]; 
     text[14] = buf; 

     //inverse shift row 4 (3 -> 15, 7 -> 3, 11 -> 7, 15 -> 11) 
     buf = text[15]; 
     text[15] = text[3]; 
     text[3] = text[7]; 
     text[7] = text[11]; 
     text[11] = buf; 
    } 

    private byte galoisMult2(byte val, byte polyRed = BYTE_POLY_REDUCTION) { //used for GaloisMult with 2 
     return val >= 128 ? (byte)((val << 1)^polyRed) : (byte)(val << 1); 
    } 

    private byte[] quickXORTable = new byte[8] { 0x00, 0x1b, 0x36, 0x2d, 0x6c, 0x77, 0x5a, 0x41 }; 
    private byte galoisDefaultMult(byte val, byte mult) { 
     int buf = val << 3; 
     if (mult != 0x0E) 
     buf ^= val; 
     if (mult > 0x0C) 
     buf ^= val << 2; 
     if ((mult & 0x02) > 0) 
     buf ^= val << 1; 
     byte xorval = quickXORTable[buf >> 8]; 
     return xorval == 0 ? (byte)buf : (byte)(buf^xorval); 
    } 

    private void mixColumn(ref byte[] text) { 
     byte[] temp = new byte[4]; 
     int p; 
     for (int i = 0; i < 4; ++i) { 
     p = i * 4; 
     temp[0] = (byte)(galoisMult2(text[p])^(galoisMult2(text[p + 1])^text[p + 1])^text[p + 2]^text[p + 3]); 
     temp[1] = (byte)(galoisMult2(text[p + 1])^(galoisMult2(text[p + 2])^text[p + 2])^text[p + 3]^text[p]); 
     temp[2] = (byte)(galoisMult2(text[p + 2])^(galoisMult2(text[p + 3])^text[p + 3])^text[p]^text[p + 1]); 
     temp[3] = (byte)(galoisMult2(text[p + 3])^(galoisMult2(text[p])^text[p])^text[p + 1]^text[p + 2]); 
     Array.Copy(temp, 0, text, p, 4); 
     } 
    } 

    private byte[] inverseMixColumnMatrixElementTable = new byte[] { 0x0B, 0x0D, 0x09, 0x0E, 0x0B, 0x0D, 0x09 }; 
    private void inverseMixColumn(ref byte[] text) { 
     byte[] temp = new byte[4]; 
     int p, p2; 
     for (int i = 0; i < 4; ++i) { 
     p = i * 4; 
     for (int j = 0; j < 4; ++j) { 
      p2 = 3 - j; 
      temp[j] = (byte)(galoisDefaultMult(text[p], inverseMixColumnMatrixElementTable[p2])^galoisDefaultMult(text[p + 1], inverseMixColumnMatrixElementTable[p2 + 1]) 
      ^galoisDefaultMult(text[p + 2], inverseMixColumnMatrixElementTable[p2 + 2])^galoisDefaultMult(text[p + 3], inverseMixColumnMatrixElementTable[p2 + 3])); 
     } 
     Array.Copy(temp, 0, text, p, 4); 
     } 
    } 

    private void encryptBlock(byte[] plaintext, ref byte[] ciphertext) { //since this is private function, no "input protection" is needed. 
     plaintext.CopyTo(ciphertext, 0); 
     for (int j = 0; j < BLOCK_SIZE; ++j) 
     ciphertext[j] ^= Subkeys[0][j];  
     for (int r = 0; r < ROUND_NO; ++r) { 
     for (int i = 0; i < BLOCK_SIZE; ++i) 
      ciphertext[i] = sBox[ciphertext[i]]; 
     shiftRows(ref ciphertext); 
     if (r < ROUND_NO - 1) 
      mixColumn(ref ciphertext); 
     for (int j = 0; j < AES128.BLOCK_SIZE; ++j) 
      ciphertext[j] ^= Subkeys[r + 1][j]; 
     } 
    } 

    private void decryptBlock(byte[] ciphertext, ref byte[] plaintext) { //since this is private function, no "input protection" is needed. 
     ciphertext.CopyTo(plaintext, 0); 
     for (int r = 0; r < ROUND_NO; ++r) { 
     for (int j = 0; j < BLOCK_SIZE; ++j) 
      plaintext[j] ^= Subkeys[ROUND_NO - r][j]; 
     if (r > 0) 
      inverseMixColumn(ref plaintext); 
     inverseShiftRows(ref plaintext); 
     for (int i = 0; i < BLOCK_SIZE; ++i) 
      plaintext[i] = inverseSBox[plaintext[i]]; 
     } 
     for (int j = 0; j < BLOCK_SIZE; ++j) 
     plaintext[j] ^= Subkeys[0][j]; 
    } 

    public bool Encrypt(byte[] plaintext, ref byte[] ciphertext) { 
     if (plaintext == null || ciphertext == null || ciphertext.Length < plaintext.Length) //invalid input(s) 
     return false; 
     int extrabytes = plaintext.Length % BLOCK_SIZE; 
     int pblock = plaintext.Length/BLOCK_SIZE + (extrabytes > 0 ? 1 : 0); 
     int cblock = ciphertext.Length/BLOCK_SIZE; 
     if (cblock < pblock) //invalid size 
     return false; 
     pblock = plaintext.Length/BLOCK_SIZE; 
     byte[] text = new byte[BLOCK_SIZE]; 
     int p; 
     for (int k = 0; k < pblock; ++k) { //Encrypt all possible blocks 
     p = k * BLOCK_SIZE; 
     Array.Copy(plaintext, p, text, 0, BLOCK_SIZE); 
     encryptBlock(text, ref text); 
     Array.Copy(text, 0, ciphertext, p, BLOCK_SIZE); 
     } 
     if (extrabytes > 0) { //encrypt the left over 
     p = pblock * BLOCK_SIZE;   
     Array.Copy(plaintext, p, text, 0, extrabytes); 
     for (int i = extrabytes; i < BLOCK_SIZE; ++i) //TODO not sure if there is any faster way in C# 
      text[i] = 0; 
     encryptBlock(text, ref text); 
     Array.Copy(text, 0, ciphertext, p, BLOCK_SIZE); 
     } 
     return true; 
    } 

    public bool Decrypt(byte[] ciphertext, ref byte[] plaintext) { //can only recover up to valid multiplication of 16, extra bytes are not decrypted 
     if (plaintext == null || ciphertext == null) //invalid input(s) 
     return false;  
     int cblock = ciphertext.Length/BLOCK_SIZE; 
     int pblock = plaintext.Length/BLOCK_SIZE; 
     if (pblock < cblock) 
     return false; //invalid size 
     byte[] text = new byte[BLOCK_SIZE]; 
     int p; 
     for (int k = 0; k < cblock; ++k) { 
     p = k * BLOCK_SIZE; 
     Array.Copy(ciphertext, p, text, 0, BLOCK_SIZE); 
     decryptBlock(text, ref text); 
     Array.Copy(text, 0, plaintext, p, BLOCK_SIZE); 
     } //extra bytes are not taken cared of... 
     return true; 
    } 

    } 
} 

注：该代码是为128位密钥