PHP uses DES for encryption and decryption

This article provides a detailed analysis of how to use DES for encryption and decryption in PHP. For more information, see

This article provides a detailed analysis of how to use DES for encryption and decryption in PHP. For more information, see

DES is a standard data encryption algorithm. For details about this algorithm, refer to Wikipedia and Baidu Encyclopedia:

Wiki encyclopedia Baidu encyclopedia

There is an extension in php that supports the DES encryption algorithm. For a Hong Kong Vm, It is extension = php_mcrypt.dll.

Opening the extension in the configuration file cannot be used in windows.

You need to copy libmcrypt. dll in the PHP folder to the system32 directory of the system and the Hong Kong virtual host. This is through phpinfo, you can see that mcrypt indicates that this module can be used properly.

The following is an example of using DES for encryption and decryption in PHP:

The Code is as follows:

// $ Input-stuff to decrypt
// $ Key-the secret key to use

Function do_mencrypt ($ input, $ key)
{
$ Input = str_replace ("" n "," ", $ input );
$ Input = str_replace ("" t "," ", $ input );
$ Input = str_replace ("" r "," ", $ input );
$ Key = substr (md5 ($ key), 0, 24 );
$ Td = mcrypt_module_open ('tripledes ', '', 'ecb ','');
$ Iv = mcrypt_create_iv (mcrypt_enc_get_iv_size ($ td), MCRYPT_RAND );
Mcrypt_generic_init ($ td, $ key, $ iv );
$ Encrypted_data = mcrypt_generic ($ td, $ input );
Mcrypt_generic_deinit ($ td );
Mcrypt_module_close ($ td );
Return trim (chop (base64_encode ($ encrypted_data )));
}

// $ Input-stuff to decrypt
// $ Key-the secret key to use

Function do_mdecrypt ($ input, $ key)
{
$ Input = str_replace ("" n "," ", $ input );
$ Input = str_replace ("" t "," ", $ input );
$ Input = str_replace ("" r "," ", $ input );
$ Input = trim (chop (base64_decode ($ input )));
$ Td = mcrypt_module_open ('tripledes ', '', 'ecb ','');
$ Key = substr (md5 ($ key), 0, 24 );
$ Iv = mcrypt_create_iv (mcrypt_enc_get_iv_size ($ td), MCRYPT_RAND );
Mcrypt_generic_init ($ td, $ key, $ iv );
$ Decrypted_data = mdecrypt_generic ($ td, $ input );
Mcrypt_generic_deinit ($ td );
Mcrypt_module_close ($ td );
Return trim (chop ($ decrypted_data ));

}

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