Encrypt (encryption and decryption)

Using system;
Using system. Security. cryptography;
Using system. text;
Using system. IO;

Public class Encrypt
{
Public encrypt ()
{}

# Region MD5 Encryption
/// <Summary>
/// MD5 Encryption
/// </Summary>
Public static string md5encrypt (string text)
{
Return md5encrypt (text, "litianping ");
}

/// <Summary>
/// MD5 Encryption
/// </Summary>
Public static string md5encrypt (string text, string skey)
{
Descryptoserviceprovider des = new descryptoserviceprovider ();
Byte [] inputbytearray = encoding. Default. getbytes (text );
Des. Key = asciiencoding. ASCII. getbytes (system. Web. Security. formsauthentication. hashpasswordforstoringinconfigfile (skey, "MD5"). substring (0, 8 ));
Des. IV = asciiencoding. ASCII. getbytes (system. Web. Security. formsauthentication. hashpasswordforstoringinconfigfile (skey, "MD5"). substring (0, 8 ));
System. Io. memorystream MS = new system. Io. 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 );
}
Return ret. tostring ();
}
# Endregion

# Region MD5 decryption
/// <Summary>
/// MD5 decryption
/// </Summary>
Public static string md5decrypt (string text)
{
Return md5decrypt (text, "litianping ");
}

/// <Summary>
/// MD5 decryption
/// </Summary>
Public static string md5decrypt (string text, string skey)
{
Descryptoserviceprovider des = new descryptoserviceprovider ();
Int Len;
Len = text. Length/2;
Byte [] inputbytearray = new byte [Len];
Int X, I;
For (x = 0; x <Len; X ++)
{
I = convert. toint32 (text. substring (x * 2, 2), 16 );
Inputbytearray [x] = (byte) I;
}
Des. Key = asciiencoding. ASCII. getbytes (system. Web. Security. formsauthentication. hashpasswordforstoringinconfigfile (skey, "MD5"). substring (0, 8 ));
Des. IV = asciiencoding. ASCII. getbytes (system. Web. Security. formsauthentication. hashpasswordforstoringinconfigfile (skey, "MD5"). substring (0, 8 ));
System. Io. memorystream MS = new system. Io. memorystream ();
Cryptostream cs = new cryptostream (MS, Des. createdecryptor (), cryptostreammode. Write );
CS. Write (inputbytearray, 0, inputbytearray. Length );
CS. flushfinalblock ();
Return encoding. Default. getstring (Ms. toarray ());
}
# Endregion

# Region tripledes Encryption
/// <Summary>
/// Tripledes Encryption
/// </Summary>
Public static string tripledesencrypting (string strsource)
{
Try
{
Byte [] bytin = encoding. Default. getbytes (strsource );
Byte [] Key = {42, 16, 93,156, 78, 4,218, 32, 15,167, 44, 80, 26, 20,155,112, 2, 94, 11,204,119, 35,184,197 }; // define the key
Byte [] IV = {55,103,246, 79, 36, 99,167, 3}; // defines the offset.
Tripledescryptoserviceprovider tripledes = new tripledescryptoserviceprovider ();
Tripledes. IV = IV;
Tripledes. Key = key;
Icryptotransform encrypto = tripledes. createencryptor ();
System. Io. memorystream MS = new system. Io. memorystream ();
Cryptostream cs = new cryptostream (MS, encrypto, cryptostreammode. Write );
CS. Write (bytin, 0, bytin. Length );
CS. flushfinalblock ();
Byte [] bytout = Ms. toarray ();
Return System. Convert. tobase64string (bytout );
}
Catch (exception ex)
{
Throw new exception ("an error occurred during encryption! Error message: \ n "+ ex. Message );
}
}
# Endregion

# Region tripledes decryption
/// <Summary>
/// Tripledes decryption
/// </Summary>
Public static string tripledesdecrypting (string source)
{
Try
{
Byte [] bytin = system. Convert. frombase64string (source );
Byte [] Key = {42, 16, 93,156, 78, 4,218, 32, 15,167, 44, 80, 26, 20,155,112, 2, 94, 11,204,119, 35,184,197 }; // define the key
Byte [] IV = {55,103,246, 79, 36, 99,167, 3}; // defines the offset.
Tripledescryptoserviceprovider tripledes = new tripledescryptoserviceprovider ();
Tripledes. IV = IV;
Tripledes. Key = key;
Icryptotransform encrypto = tripledes. createdecryptor ();
System. Io. memorystream MS = new system. Io. memorystream (bytin, 0, bytin. Length );
Cryptostream cs = new cryptostream (MS, encrypto, cryptostreammode. Read );
Streamreader strd = new streamreader (CS, encoding. Default );
Return strd. readtoend ();
}
Catch (exception ex)
{
Throw new exception ("an error occurred during decryption! Error message: \ n "+ ex. Message );
}
}
# Endregion
}

Encrypt (encryption and decryption)