Symmetric eds encryption and decryption method

1. Import two namespaces:

Using system. Security. cryptography;

Using system. Text. regularexpressions;

 

2. encryption and decryption class:

Private Static readonly string skey = "qjzgeh6heszdvjecnfpguxzaib7nlqm3"; // key

Private Static readonly string SIV = "qcdy6x + aplw ="; // vector, which can be empty

Private Static algorithm ricalgorithm MCSP = new tripledescryptoserviceprovider (); // construct a symmetric algorithm

 

3. encryption method:

Public static string encryptdes (string source)

{

Icryptotransform CT;

Memorystream MS;

Cryptostream Cs;

Byte [] BYT;

 

String STR = NULL;

MCSP. Key = convert. frombase64string (skey );

MCSP. IV = convert. frombase64string (SIV );

MCSP. mode = system. Security. cryptography. ciphermode. ECB;

MCSP. Padding = system. Security. cryptography. paddingmode. pkcs7;

 

Ct = MCSP. createencryptor (MCSP. Key, MCSP. IV );

 

Byt = encoding. utf8.getbytes (source );

 

MS = new memorystream ();

Cs = new cryptostream (MS, CT, cryptostreammode. Write );

CS. Write (BYT, 0, byt. Length );

CS. flushfinalblock ();

 

CS. Close ();

 

STR = convert. tobase64string (Ms. toarray ());

 

Return STR;

}

 

4. Confidential methods:

Public static string decryptdes (string source)

{

Icryptotransform CT;

Memorystream MS;

Cryptostream Cs;

Byte [] BYT;

 

String STR = NULL;

 

MCSP. Key = convert. frombase64string (skey );

MCSP. IV = convert. frombase64string (SIV );

MCSP. mode = system. Security. cryptography. ciphermode. ECB;

MCSP. Padding = system. Security. cryptography. paddingmode. pkcs7;

 

Ct = MCSP. createdecryptor (MCSP. Key, MCSP. IV );

 

Byt = convert. frombase64string (source );

 

MS = new memorystream ();

Cs = new cryptostream (MS, CT, cryptostreammode. Write );

CS. Write (BYT, 0, byt. Length );

CS. flushfinalblock ();

 

CS. Close ();

 

STR = encoding. utf8.getstring (Ms. toarray ());

 

Return STR;

}