Notes: des encryption and decryption, php and. net implementation

Note: For des encryption and decryption, php and. net implementation php5.x, you need to add php extension php_mcrypt.

1 class STD3Des 2 {3 private $ key = ""; 4 private $ iv = ""; 5 6/** 7 * structure, pass two keys with base64_encode and IV 8*9 * @ param string $ key10 * @ param string $ iv11 */12 function _ construct ($ KEY, $ iv) 13 {14 if (empty ($ key) | empty ($ iv) {15 echo 'key and iv is not valid'; 16 exit (); 17} 18 $ this-> key = $ key; 19 $ this-> iv = $ iv; 20} 21 22/** 23 * encrypted 24 * @ param
 
  
$ Value25 * @ return
  
   
26 */27 public function encrypt ($ value) 28 {29 $ td = mcrypt_module_open (MCRYPT_3DES, '', MCRYPT_MODE_CBC ,''); 30 $ iv = base64_decode ($ this-> iv); 31 $ value = $ this-> PaddingPKCS7 ($ value); 32 $ key = base64_decode ($ this-> key ); 33 mcrypt_generic_init ($ td, $ key, $ iv); 34 $ ret = base64_encode (mcrypt_generic ($ td, $ value); 35 mcrypt_generic_deinit ($ td ); 36 mcrypt_module_close ($ td); 37 return $ ret; 38} 39 40/** 41 * decrypt 42 * @ param
   
    
$ Value43 * @ return
    
     
44 */45 public function decrypt ($ value) 46 {47 $ td = mcrypt_module_open (MCRYPT_3DES, '', MCRYPT_MODE_CBC ,''); 48 $ iv = base64_decode ($ this-> iv); 49 $ key = base64_decode ($ this-> key); 50 mcrypt_generic_init ($ td, $ key, $ iv ); 51 $ ret = trim (mdecrypt_generic ($ td, base64_decode ($ value); 52 $ ret = $ this-> UnPaddingPKCS7 ($ ret); 53 mcrypt_generic_deinit ($ td ); 54 mcrypt_module_close ($ td); 55 return $ ret; 56} 57 58 Private function PaddingPKCS7 ($ data) 59 {60 $ block_size = mcrypt_get_block_size ('tripledes ', 'cbc'); 61 $ padding_char = $ block_size-(strlen ($ data) % $ block_size); 62 $ data. = str_repeat (chr ($ padding_char), $ padding_char); 63 return $ data; 64} 65 66 private function UnPaddingPKCS7 ($ text) 67 {68 $ pad = ord ($ text {strlen ($ text)-1}); 69 if ($ pad> strlen ($ text) {70 return false; 71} 72 if (strspns ($ text, Chr ($ pad), strlen ($ text)-$ pad )! = $ Pad) {73 return false; 74} 75 return substr ($ text, 0,-1 * $ pad ); 76} 77} 78 79 80 // use 81 include ('std3des. class. php '); 82 $ key = 'abcdefgh'; 83 $ iv = 'abcdefgh'; 84 $ msg = 'Test string '; 85 $ des = new STD3Des (base64_encode ($ key), base64_encode ($ iv); 86 $ rs1 = $ des-> encrypt ($ msg); 87 echo $ rs1 .'
     
'; 88 $ rs2 = $ des-> decrypt ($ rs1); 89 echo $ rs2;
    
   
  
 

. Net version

1 sealed public class CryptoHelper 2 {3 ///4 // Encrypts the specified input. 5 ///6 ///The input.7 ///Key8 ///Iv9 ///
 10 public static string EncryptDes (string input, byte [] key, byte [] iv) 11 {12 if (input = null | input. length = 0) 13 return String. empty; 14 15 DESCryptoServiceProvider des = new DESCryptoServiceProvider (); 16 MemoryStream MS = null; 17 CryptoStream encStream = null; 18 StreamWriter sw = null; 19 string result = String. empty; 20 21 try 22 {23 MS = new MemoryStream (); 24 25 // Create a Crypto Stream using the memory stream and the 26 // csp des key. 27 // des. mode = CipherMode. CBC; 28 // des. padding = PaddingMode. PKCS7; 29 encStream = new CryptoStream (MS, des. createEncryptor (key, iv), CryptoStreamMode. write); 30 31 // Create a StreamWriter to write a string 32 // to the stream. 33 sw = new StreamWriter (encStream); 34 35 // Write the plaintext to the stream. 36 sw. write (input); 37 38 sw. F Lush (); 39 encStream. flushFinalBlock (); 40 ms. flush (); 41 42 43 result = Convert. toBase64String (ms. getBuffer (), 0, Convert. toInt32 (ms. length, CultureInfo. invariantCulture); 44} 45 finally 46 {47 // close objects 48 if (sw! = Null) 49 sw. Close (); 50 if (encStream! = Null) 51 encStream. Close (); 52 if (MS! = Null) 53 ms. Close (); 54} 55 56 // Return the encrypted string 57 return result; 58} 59 ///60 // Decrypts the specified input. 61 ///62 ///The input.63 ///Key64 ///Iv65 ///
 66 public static string DecryptDes (string input, byte [] key, byte [] iv) 67 {68 byte [] buffer; 69 try {buffer = Convert. fromBase64String (input);} 70 catch (System. argumentNullException) {return String. empty;} 71 // length is zero, or not an even multiple of four (plus a few other cases) 72 catch (System. formatException) {return String. empty;} 73 74 DESCryptoServiceProvider des = new DESCrypto ServiceProvider (); 75 MemoryStream MS = null; 76 CryptoStream encStream = null; 77 StreamReader sr = null; 78 string result = String. empty; 79 80 try 81 {82 MS = new MemoryStream (buffer); 83 84 // Create a CryptoStream using the memory stream and the 85 // csp des key. 86 encStream = new CryptoStream (MS, des. createDecryptor (key, iv), CryptoStreamMode. read); 87 88 // Create a StreamReader for read Ing the stream. 89 sr = new StreamReader (encStream); 90 91 // Read the stream as a string. 92 result = sr. readToEnd (); 93} 94 finally 95 {96 // close objects 97 if (sr! = Null) 98 sr. Close (); 99 if (encStream! = Null) 100 encStream. Close (); 101 if (MS! = Null) 102 ms. close (); 103} 104 105 return result; 106} 107 108 109 // call 110 111 string key = "abcdefgh"; 112 string iv = "abcdefgh "; 114 string msg = "test string"; 115 string rs1 = CryptoHelper. encryptDes (msg, System. text. encoding. ASCII. getBytes (key), System. text. encoding. ASCII. getBytes (iv); 116 string rs2 = CryptoHelper. decryptDes (rs1, System. text. encoding. ASCII. getBytes (key), System. text. encoding. ASCII. getBytes (iv ));