C # DES encryption and decryption Methods

1 /// <summary>
2 // perform DES encryption.
3 /// </summary>
4 /// <param name = "pToEncrypt"> string to be encrypted. </Param>
5 /// <param name = "sKey"> key, which must be 8 bits. </Param>
6 /// <returns> the encrypted string returned in Base64 format. </Returns>
7 public string Encrypt (string pToEncrypt, string sKey)
8 {
9 using (DESCryptoServiceProvider des = new DESCryptoServiceProvider ())
10 {
11 byte [] inputByteArray = Encoding. UTF8.GetBytes (pToEncrypt );
12 des. Key = ASCIIEncoding. ASCII. GetBytes (sKey );
13 des. IV = ASCIIEncoding. ASCII. GetBytes (sKey );
14 System. IO. MemoryStream MS = new System. IO. MemoryStream ();
15 using (CryptoStream cs = new CryptoStream (MS, des. CreateEncryptor (), CryptoStreamMode. Write ))
16 {
17 cs. Write (inputByteArray, 0, inputByteArray. Length );
18 cs. FlushFinalBlock ();
19 cs. Close ();
20}
21 string str = Convert. ToBase64String (ms. ToArray ());
22 ms. Close ();
23 return str;
24}
25}
26
27
28 // <summary>
29 // perform DES decryption.
30 // </summary>
31 // <param name = "pToDecrypt"> the Base64 file to be decrypted </param>
32 // <param name = "sKey"> key, which must be 8 bits. </Param>
33 // <returns> decrypted string. </Returns>
34 public string Decrypt (string pToDecrypt, string sKey)
35 {
36 byte [] inputByteArray = Convert. FromBase64String (pToDecrypt );
37 using (DESCryptoServiceProvider des = new DESCryptoServiceProvider ())
38 {
39 des. Key = ASCIIEncoding. ASCII. GetBytes (sKey );
40 des. IV = ASCIIEncoding. ASCII. GetBytes (sKey );
41 System. IO. MemoryStream MS = new System. IO. MemoryStream ();
42 using (CryptoStream cs = new CryptoStream (MS, des. CreateDecryptor (), CryptoStreamMode. Write ))
43 {
44 cs. Write (inputByteArray, 0, inputByteArray. Length );
45 cs. FlushFinalBlock ();
46 cs. Close ();
47}
48 string str = Encoding. UTF8.GetString (ms. ToArray ());
49 ms. Close ();
50 return str;
51}
52}