//Encoding ecd;
public TripleDESCipher(String textStr, byte[] textByte, DESKey desKey, bool flag) //加密&解密构造器
{
if (flag == true) //加密
{
doCipher(textByte, desKey);
}
else//解密
{
textByte = new byte[textStr.Length / 8];
int[] textInt = new int[textStr.Length / 8];
char[] textChar = new char[textStr.Length / 8];
for (int i = 0; i < textByte.Length; i++)
{
textInt[i] = Convert.ToInt32(textStr.Substring(i * 8, 8), 2);
textByte[i] = (byte)textInt[i];
}
seq = 15;
doCipher(textByte, desKey);
for (int i = 0; i < textInt.Length; i++)
{
textInt[i] = Convert.ToInt32(outStr.ToString().Substring(i * 8, 8), 2);
textByte[i] = (byte)textInt[i];
}
outBytes = textByte;
outStr.Remove(0, outStr.Length);
outStr.Append(Encoding.Unicode.GetString(textByte));
}
}
private void doCipher(byte[] textByte, DESKey desKey)
{
int loop = 0;
int pos = 0;
while (loop < textByte.Length / 8)
{
int[] text64 = new int[64];
int[] lr = new int[64];
int n = 0;
for (int i = pos; i < pos + 8; i++)
{
for (int j = 7; j >= 0; j--)
{
text64[n++] = (textByte[i] >> j & 1);
}
}
for (int i = 0; i < 32; i++)//生成l0
{
l[i] = text64[IP[i] - 1];
}
for (int i = 0; i < 32; i++)
{
r[i] = text64[IP[i + 32] - 1]; //生成r0
}
dolr(desKey); //得到16次加密之后最终的l和r
for (int i = 0; i < 32; i++)
{
lr[i] = r[i];
}
for (int i = 0; i < 32; i++)
{
lr[i + 32] = l[i];
}
for (int i = 0; i < 64; i++)
{
text64[i] = lr[IP_1[i] - 1];
outStr.Append(text64[i]);
}
pos += 8;
loop++;
}
}
public static string Encrypt(string Source, string[] Key)
{
if (String.IsNullOrEmpty(Source))
{
throw new Exception("没有输入明文！");
}
if (Key.Length < 3)
{
throw new Exception("密匙个数不足（需3个密匙）！");
}
else
{
int kl1 = Encoding.Default.GetBytes(Key[0]).Length;
int kl2 = Encoding.Default.GetBytes(Key[1]).Length;
int kl3 = Encoding.Default.GetBytes(Key[2]).Length;
if (kl1 != 8 || kl2 != 8 || kl3 != 8)
{
throw new Exception("每个密钥必须均为8个字符或4个汉字！");
}
}
DESKey desKey1 = new DESKey(Key[0]);
DESKey desKey2 = new DESKey(Key[1]);
DESKey desKey3 = new DESKey(Key[2]);
int space = (8 - (Encoding.Unicode.GetBytes(Source)).Length % 8) % 8;
for (int i = 0; i < space; i++)
{
Source = Source + " ";
}
byte[] textByte = Encoding.Unicode.GetBytes(Source);
TripleDESCipher cipher = new TripleDESCipher(null, textByte, desKey1, true);
TripleDESCipher decipher = new TripleDESCipher(cipher.getOutStr(), null, desKey2, false);
cipher = new TripleDESCipher(null, decipher.getOutBytes(), desKey3, true);
return(cipher.getOutStr());
}
public static string Decrypt(string Source, string[] Key)
{
if (String.IsNullOrEmpty(Source))
{
throw new Exception("没有输入明文！");
}
if (Key.Length < 3)
{
throw new Exception("密匙个数不足（需3个密匙）！");
}
else
{
int kl1 = Encoding.Default.GetBytes(Key[0]).Length;
int kl2 = Encoding.Default.GetBytes(Key[1]).Length;
int kl3 = Encoding.Default.GetBytes(Key[2]).Length;
if (kl1 != 8 || kl2 != 8 || kl3 != 8)
{
throw new Exception("每个密钥必须均为8个字符或4个汉字！");
}
}
for (int i = 0; i < Source.Length; i++)
{
if ((!Source[i].ToString().Equals("1")) && (!Source[i].ToString().Equals("0")))
{
throw new Exception("密文内容有误！（密文内容仅含有0或1）");
}
}
DESKey desKey1 = new DESKey(Key[0]);
DESKey desKey2 = new DESKey(Key[1]);
DESKey desKey3 = new DESKey(Key[2]);
TripleDESCipher decipher = new TripleDESCipher(Source, null, desKey3, false);
TripleDESCipher cipher = new TripleDESCipher(null, decipher.getOutBytes(), desKey2, true);
decipher = new TripleDESCipher(cipher.getOutStr(), null, desKey1, false);
return(Encoding.Unicode.GetString(decipher.getOutBytes()));
}
private void dolr(DESKey desKey)
{
int[] r48 = new int[48];
int[] K;
int[] r32 = this.r;
for (int i = 0; i < 16; i++)
{
K = desKey.getK(Math.Abs(i - seq));
for (int j = 0; j < 48; j++)
{
r48[j] = (r32[E[j] - 1] + K[j]) % 2;
}
r32 = doSBox(r48);//进盒子
for (int j = 0; j < 32; j++)
{
r32[j] = (r32[j] + this.l[j]) % 2;
}
this.l = this.r;
this.r = r32;
}
}
