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 string Encrypt(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("密钥必须为16个字符或8个汉字！");
}
break;
}
case 24:
{
if (KeyByteLength != 24)
{
throw new Exception("密钥必须为24个字符或12个汉字！");
}
break;
}
case 32:
{
if (KeyByteLength != 32)
{
throw new Exception("密钥必须为32个字符或16个汉字！");
}
break;
}
default:
{
throw new Exception("所选密钥位数错误，请选择16、24或32位密匙");
}
}
int[,] key = KeyExpansion.GetKeyExpansion(Key);
int[,] cipher = Encryption.Getencryption(Source, key);
StringBuilder strB = new StringBuilder();
for (int i = 0; i < cipher.GetLength(0); i++)
{
for (int j = 0; j < 16; j++)
{
StringBuilder s = new StringBuilder();
byte[] buf = new byte[2];
s = SubBytes.GetStr(cipher[i, j]);
buf[0] = Convert.ToByte(s.ToString(0, 4), 2);
buf[1] = Convert.ToByte(s.ToString(4, 4), 2);
strB.Append(alphabet[buf[0]] + "" + alphabet[buf[1]]);
}
}
return(strB.ToString());
}