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);
}
}
EncryptionForm encryForm = new EncryptionForm();
encryForm.Show();
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];
}
encryForm.SetText("密钥：", cipherkey);
plaintext = AddRoundKey(plaintext, cipherkey);
encryForm.SetText("InvAddRoundKey:", plaintext);
encryForm.Set();
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]);
}
encryForm.SetText("InvSubBytes:", plaintext);
plaintext = InvShiftRows(plaintext);
encryForm.SetText("InvShiftRows:", plaintext);
plaintext = MixColumn.InvMixColumn(plaintext);
encryForm.SetText("InvMixColumn:", plaintext);
encryForm.SetText("轮密钥：", cipherkey);
plaintext = AddRoundKey(plaintext, cipherkey);
encryForm.SetText("InvAddRoundKey:", plaintext);
encryForm.Set();
}
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]);
}
encryForm.SetText("InvSubBytes:", plaintext);
plaintext = InvShiftRows(plaintext);
encryForm.SetText("InvShiftRows:", plaintext);
encryForm.SetText("轮密钥：", cipherkey);
plaintext = AddRoundKey(plaintext, cipherkey);
encryForm.SetText("InvAddRoundKey:", plaintext);
for (int j = 0; j < 16; j++)
{
plian[i, j] = plaintext[j];
}
}
encryForm.Settext();
return(plian);
}
private void DecryptionBtn_Click_1(object sender, EventArgs e)
{
if (radioBtn1.Checked == true)
{
if (Encoding.Default.GetBytes(KeyText.Text).Length != 16)
{
MessageBox.Show("密钥个数必须为16个字符或8个汉字！", "ERROR", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
}
if (radioBtn2.Checked == true)
{
if (Encoding.Default.GetBytes(KeyText.Text).Length != 24)
{
MessageBox.Show("密钥个数必须为24个字符或12个汉字！", "ERROR", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
}
if (radioBtn3.Checked == true)
{
if (Encoding.Default.GetBytes(KeyText.Text).Length != 32)
{
MessageBox.Show("密钥个数必须为32个字符或16个汉字！", "ERROR", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
}
else
{
if (KeyText.Text.Length == 0)
{
MessageBox.Show("请输入密钥！", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
if (CipherText.Text.Length == 0 && KeyText.Text.Length != 0)
{
MessageBox.Show("请输入密文！", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
sw4.Start();
int[,] key = KeyExpansion.GetKeyExpansion(KeyText.Text.ToString().Trim());
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(CipherText.Text.ToString(), 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.Default.GetString(result));
PlainText.Text = strB.ToString();
sw4.Stop();
}
TimeSpan ts4 = sw4.Elapsed;
label2.Text = ts4.ToString();
//MessageBox.Show("解密用时" + ts4, "计时结果");
}