Descryptoserviceprovider encryption and decryption

Public String encrypt (string stringtoencrypt, string skey)
{
Descryptoserviceprovider des = new descryptoserviceprovider ();
Byte [] inputbytearray = encoding. getencoding ("UTF-8"). getbytes (stringtoencrypt );
Des. Key = asciiencoding. utf8.getbytes (skey );
Des. IV = asciiencoding. utf8.getbytes (skey );
Memorystream MS = new memorystream ();
Cryptostream cs = new cryptostream (MS, Des. createencryptor (), cryptostreammode. Write );

CS. Write (inputbytearray, 0, inputbytearray. Length );
CS. flushfinalblock ();

Stringbuilder ret = new stringbuilder ();
Foreach (byte B in ms. toarray ())
{
Ret. appendformat ("{0: X2}", B );
}
Ret. tostring ();
Return ret. tostring ();
}

Public String decrypt (string stringtodecrypt, string skey)
{
Descryptoserviceprovider des = new descryptoserviceprovider ();

Byte [] inputbytearray = new byte [stringtodecrypt. Length/2];
For (INT x = 0; x <stringtodecrypt. Length/2; X ++)
{
Int I = (convert. toint32 (stringtodecrypt. substring (x * 2, 2), 16 ));
Inputbytearray [x] = (byte) I;
}

Des. Key = asciiencoding. utf8.getbytes (skey );
Des. IV = asciiencoding. utf8.getbytes (skey );
Memorystream MS = new memorystream ();
Cryptostream cs = new cryptostream (MS, Des. createdecryptor (), cryptostreammode. Write );
CS. Write (inputbytearray, 0, inputbytearray. Length );
CS. flushfinalblock ();

Stringbuilder ret = new stringbuilder ();

Return System. Text. encoding. Default. getstring (Ms. toarray ());
}

 

 

//

 

Public sealed class desencrypt
...{
Private desencrypt ()
...{
//
// Todo: add the constructor logic here
//
}

Private Static string key = "zhoufoxcn ";

/** // <Summary>
/// Symmetric encryption and decryption key
/// </Summary>
Public static string key
...{
Get
...{
Return key;
}
Set
...{
Key = value;
}
}

/** // <Summary>
/// DES encryption
/// </Summary>
/// <Param name = "encryptstring"> </param>
/// <Returns> </returns>
Public static string desencrypt (string encryptstring)
...{
Byte [] keybytes = encoding. utf8.getbytes (key. substring (0, 8 ));
Byte [] keyiv = keybytes;
Byte [] inputbytearray = encoding. utf8.getbytes (encryptstring );
Descryptoserviceprovider provider = new descryptoserviceprovider ();
Memorystream mstream = new memorystream ();
Cryptostream cstream = new cryptostream (mstream, provider. createencryptor (keybytes, keyiv), cryptostreammode. Write );
Cstream. Write (inputbytearray, 0, inputbytearray. Length );
Cstream. flushfinalblock ();
Return convert. tobase64string (mstream. toarray ());
}

/** // <Summary>
/// Des decryption
/// </Summary>
/// <Param name = "decryptstring"> </param>
/// <Returns> </returns>
Public static string desdecrypt (string decryptstring)
...{
Byte [] keybytes = encoding. utf8.getbytes (key. substring (0, 8 ));
Byte [] keyiv = keybytes;
Byte [] inputbytearray = convert. frombase64string (decryptstring );
Descryptoserviceprovider provider = new descryptoserviceprovider ();
Memorystream mstream = new memorystream ();
Cryptostream cstream = new cryptostream (mstream, provider. createdecryptor (keybytes, keyiv), cryptostreammode. Write );
Cstream. Write (inputbytearray, 0, inputbytearray. Length );
Cstream. flushfinalblock ();
Return encoding. utf8.getstring (mstream. toarray ());
}
}