public static int[,] Getdecryption(string str, int[,] key)
{
int[] cipherkey = new int[16];
str = str.ToLower();
char[] ch = str.ToCharArray();
int[,] cipher = new int[str.Length / 32, 16];
int[,] plian = new int[str.Length / 32, 16];
int[] plaintext = new int[16];
StringBuilder s = new StringBuilder(100000);
for (int i = 0; i < str.Length; i++)
{
for (int j = 3; j >= 0; j--)
{
s = s.Append(Decryption.GetNum(ch[i]) >> j & 1);
}
}
for (int i = 0; i < cipher.GetLength(0); i++)
{
for (int j = 0; j < 16; j++)
{
cipher[i, j] = Convert.ToInt32(s.ToString(j * 8 + i * 128, 8), 2);
}
}
for (int i = 0; i < cipher.GetLength(0); i++)
{
for (int h = 0; h < 16; h++)
{
cipherkey[h] = key[key.GetLength(0) - 1, h];
plaintext[h] = cipher[i, h];
}
plaintext = AddRoundKey(plaintext, cipherkey);
for (int j = key.GetLength(0) - 2; j > 0; j--)
{
for (int h = 0; h < 16; h++)
{
cipherkey[h] = key[j, h];
}
for (int h = 0; h < plaintext.Length; h++)
{
plaintext[h] = SubBytes.GetByteSub(plaintext[h]);
}
plaintext = InvShiftRows(plaintext);
plaintext = MixColumn.InvMixColumn(plaintext);
plaintext = AddRoundKey(plaintext, cipherkey);
}
for (int h = 0; h < 16; h++)
{
cipherkey[h] = key[0, h];
}
for (int h = 0; h < plaintext.Length; h++)
{
plaintext[h] = SubBytes.GetByteSub(plaintext[h]);
}
plaintext = InvShiftRows(plaintext);
plaintext = AddRoundKey(plaintext, cipherkey);
for (int j = 0; j < 16; j++)
{
plian[i, j] = plaintext[j];
}
}
return(plian);
}
public static string Decrypt(string Source, string Key, byte KeyLengthChoiced = 16)
{
if (String.IsNullOrEmpty(Source))
{
throw new Exception("没有输入明文！");
}
int KeyByteLength = Encoding.Default.GetBytes(Key).Length;
switch (KeyLengthChoiced)
{
case 16:
{
if (KeyByteLength != 16)
{
throw new Exception("密钥个数必须为16个字符或8个汉字！");
}
break;
}
case 24:
{
if (KeyByteLength != 24)
{
throw new Exception("密钥个数必须为24个字符或12个汉字！");
}
break;
}
case 32:
{
if (KeyByteLength != 32)
{
throw new Exception("密钥个数必须为32个字符或16个汉字！");
}
break;
}
default:
{
throw new Exception("所选密钥个数错误，请选择16、24或32位密匙");
}
}
try
{
//用于检测，"密文内容有误！（密文内容应为16进制）"
int temp;
for (int i = 0; i < Source.Length; i++)
{
temp = Convert.ToInt32(Source[i].ToString(), 16);
}
}
catch
{
throw new Exception("密文内容有误！（密文内容应为16进制）");
}
int[,] key = KeyExpansion.GetKeyExpansion(Key);
int[,] cipherKey = new int[key.GetLength(0), key.GetLength(1)];
int[] key1 = new int[key.GetLength(1)];
for (int i = 0; i < key.GetLength(1); i++)
{
cipherKey[0, i] = key[0, i];
cipherKey[key.GetLength(0) - 1, i] = key[key.GetLength(0) - 1, i];
}
for (int i = 1; i < key.GetLength(0) - 1; i++)
{
for (int j = 0; j < key.GetLength(1); j++)
{
key1[j] = key[i, j];
}
key1 = MixColumn.InvMixColumn(key1);
for (int j = 0; j < key.GetLength(1); j++)
{
cipherKey[i, j] = key1[j];
}
}
int[,] plain = Decryption.Getdecryption(Source, cipherKey);
StringBuilder strB = new StringBuilder();
StringBuilder s = new StringBuilder();
byte[] result = new byte[plain.GetLength(0) * 16];
for (int i = 0; i < plain.GetLength(0); i++)
{
for (int j = 0; j < 16; j++)
{
for (int h = 7; h >= 0; h--)
{
s.Append(plain[i, j] >> h & 1);
}
}
}
for (int i = 0; i < result.Length; i++)
{
result[i] = Convert.ToByte(s.ToString(i * 8, 8), 2);
}
strB.Append(Encoding.UTF8.GetString(result));
return(strB.ToString());
}
public static int[,] Getencryption(string str, int[,] key)
{
str = str.ToLower();
StringBuilder strB = new StringBuilder(str);
if (strB.Length % 16 != 0)
{
int len = strB.Length;
for (int i = 0; i < 32 - len % 32; i++)
{
strB = strB.Append(" ");
}
}
byte[] buf = Encoding.UTF8.GetBytes(strB.ToString());
int[] cipherkey = new int[16];
int[,] plain = new int[buf.Length / 16, 16];
int[,] ciphertext = new int[buf.Length / 16, 16];
int[] plaintext = new int[16];
StringBuilder s = new StringBuilder(100000);
for (int i = 0; i < buf.Length; i++)
{
for (int j = 7; j >= 0; j--)
{
s = s.Append(buf[i] >> j & 1);
}
}
for (int i = 0; i < plain.GetLength(0); i++)
{
for (int j = 0; j < 16; j++)
{
plain[i, j] = Convert.ToInt32(s.ToString(j * 8 + i * 128, 8), 2);
}
}
for (int i = 0; i < plain.GetLength(0); i++)
{
for (int h = 0; h < 16; h++)
{
cipherkey[h] = key[0, h];
plaintext[h] = plain[i, h];
}
plaintext = AddRoundKey(plaintext, cipherkey);
for (int j = 0; j < key.GetLength(0) - 2; j++)
{
for (int h = 0; h < 16; h++)
{
cipherkey[h] = key[j + 1, h];
}
for (int h = 0; h < plaintext.Length; h++)
{
plaintext[h] = SubBytes.GetSubByte(plaintext[h]);
}
plaintext = ShiftRows(plaintext);
plaintext = MixColumn.GetMixColumn(plaintext);
plaintext = AddRoundKey(plaintext, cipherkey);
}
for (int h = 0; h < 16; h++)
{
cipherkey[h] = key[key.GetLength(0) - 1, h];
}
for (int h = 0; h < plaintext.Length; h++)
{
plaintext[h] = SubBytes.GetSubByte(plaintext[h]);
}
plaintext = ShiftRows(plaintext);
plaintext = AddRoundKey(plaintext, cipherkey);
for (int j = 0; j < 16; j++)
{
ciphertext[i, j] = plaintext[j];
}
}
return(ciphertext);
}
