Implementation of des encryption and decryption in PHP and. net

In php5.x, add the php extension php_mcrypt.

PHP version:

Copy codeThe Code is as follows: class STD3Des
{
Private $ key = "";
Private $ iv = "";

/**
* Construct and pass two keys and IV that have been base64_encode
*
* @ Param string $ key
* @ Param string $ iv
*/
Function _ construct ($ key, $ iv)
{
If (empty ($ key) | empty ($ iv )){
Echo 'key and iv is not valid ';
Exit ();
}
$ This-> key = $ key;
$ This-> iv = $ iv;
}

/**
* Encryption
* @ Param <type> $ value
* @ Return <type>
*/
Public function encrypt ($ value)
{
$ Td = mcrypt_module_open (MCRYPT_3DES, '', MCRYPT_MODE_CBC ,'');
$ Iv = base64_decode ($ this-> iv );
$ Value = $ this-> PaddingPKCS7 ($ value );
$ Key = base64_decode ($ this-> key );
Mcrypt_generic_init ($ td, $ key, $ iv );
$ Ret = base64_encode (mcrypt_generic ($ td, $ value ));
Mcrypt_generic_deinit ($ td );
Mcrypt_module_close ($ td );
Return $ ret;
}

/**
* Decryption
* @ Param <type> $ value
* @ Return <type>
*/
Public function decrypt ($ value)
{
$ Td = mcrypt_module_open (MCRYPT_3DES, '', MCRYPT_MODE_CBC ,'');
$ Iv = base64_decode ($ this-> iv );
$ Key = base64_decode ($ this-> key );
Mcrypt_generic_init ($ td, $ key, $ iv );
$ Ret = trim (mdecrypt_generic ($ td, base64_decode ($ value )));
$ Ret = $ this-> UnPaddingPKCS7 ($ ret );
Mcrypt_generic_deinit ($ td );
Mcrypt_module_close ($ td );
Return $ ret;
}

Private function PaddingPKCS7 ($ data)
{
$ Block_size = mcrypt_get_block_size ('tripledes ', 'cbc ');
$ Padding_char = $ block_size-(strlen ($ data) % $ block_size );
$ Data. = str_repeat (chr ($ padding_char), $ padding_char );
Return $ data;
}

Private function UnPaddingPKCS7 ($ text)
{
$ Pad = ord ($ text {strlen ($ text)-1 });
If ($ pad> strlen ($ text )){
Return false;
}
If (strspn ($ text, chr ($ pad), strlen ($ text)-$ pad )! = $ Pad ){
Return false;
}
Return substr ($ text, 0,-1 * $ pad );
}
}

// Use
Include ('std3des. class. php ');
$ Key = 'abcdefgh ';
$ Iv = 'abcdefgh ';
$ Msg = 'test string ';
$ Des = new STD3Des (base64_encode ($ key), base64_encode ($ iv ));
$ Rs1 = $ des-> encrypt ($ msg );
Echo $ rs1. '<br/> ';
$ Rs2 = $ des-> decrypt ($ rs1 );
Echo $ rs2;

. Net version

Copy codeThe Code is as follows: sealed public class CryptoHelper
{
/// <Summary>
/// Encrypts the specified input.
/// </Summary>
/// <Param name = "input"> The input. </param>
/// <Param name = "key"> key </param>
/// <Param name = "iv"> iv </param>
/// <Returns> </returns>
Public static string EncryptDes (string input, byte [] key, byte [] iv)
{
If (input = null | input. Length = 0)
Return String. Empty;

DESCryptoServiceProvider des = new DESCryptoServiceProvider ();
MemoryStream MS = null;
CryptoStream encStream = null;
StreamWriter sw = null;
String result = String. Empty;

Try
{
MS = new MemoryStream ();

// Create a CryptoStream using the memory stream and
// Csp des key.
// Des. Mode = CipherMode. CBC;
// Des. Padding = PaddingMode. PKCS7;
EncStream = new CryptoStream (MS, des. CreateEncryptor (key, iv), CryptoStreamMode. Write );

// Create a StreamWriter to write a string
// To the stream.
Sw = new StreamWriter (encStream );

// Write the plaintext to the stream.
Sw. Write (input );

Sw. Flush ();
EncStream. FlushFinalBlock ();
Ms. Flush ();

Result = Convert. ToBase64String (ms. GetBuffer (), 0, Convert. ToInt32 (ms. Length, CultureInfo. InvariantCulture ));
}
Finally
{
// Close objects
If (sw! = Null)
Sw. Close ();
If (encStream! = Null)
EncStream. Close ();
If (MS! = Null)
Ms. Close ();
}

// Return the encrypted string
Return result;
}
/// <Summary>
/// Decrypts the specified input.
/// </Summary>
/// <Param name = "input"> the input. </param>
/// <Param name = "key"> key </param>
/// <Param name = "iv"> iv </param>
/// <Returns> </returns>
Public static string DecryptDes (string input, byte [] key, byte [] iv)
{
Byte [] buffer;
Try {buffer = Convert. FromBase64String (input );}
Catch (System. ArgumentNullException) {return String. Empty ;}
// Length is zero, or not an even multiple of four (plus a few other cases)
Catch (System. FormatException) {return String. Empty ;}

DESCryptoServiceProvider des = new DESCryptoServiceProvider ();
MemoryStream MS = null;
CryptoStream encStream = null;
StreamReader sr = null;
String result = String. Empty;

Try
{
MS = new MemoryStream (buffer );

// Create a CryptoStream using the memory stream and
// Csp des key.
EncStream = new CryptoStream (MS, des. CreateDecryptor (key, iv), CryptoStreamMode. Read );

// Create a StreamReader for reading the stream.
Sr = new StreamReader (encStream );

// Read the stream as a string.
Result = sr. ReadToEnd ();
}
Finally
{
// Close objects
If (sr! = Null)
Sr. Close ();
If (encStream! = Null)
EncStream. Close ();
If (MS! = Null)
Ms. Close ();
}

Return result;
}
}

// Call

String key = "abcdefgh ";
String iv = "abcdefgh ";
String msg = "test string ";
String rs1 = CryptoHelper. EncryptDes (msg, System. Text. Encoding. ASCII. GetBytes (key), System. Text. Encoding. ASCII. GetBytes (iv ));
String rs2 = CryptoHelper. DecryptDes (rs1, System. Text. Encoding. ASCII. GetBytes (key), System. Text. Encoding. ASCII. GetBytes (iv ));