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    Crypt is a string encoding function (hashing). It is used to encrypt passwords, for example in htaccess password files.

    There are different implementations of the crypt function:

    Unix Specification[edit]

    crypt,Single UNIX ® Specification Crypt und Unix Passwörter (de)

    crypt in Java[edit]

    Java Implementations of Unix crypt Javascript crypt

    PHP crypt -- One-way string encryption (hashing)

    crypt in PHP[edit]

    crypt() will return an encrypted string using the standard Unix DES-based encryption algorithm or alternative algorithms that may be available on the system. Arguments are a string to be encrypted and an optional salt string to base the encryption on. See the Unix man page for your crypt function for more information.

    Multiple encryption types[edit]

    On systems where the crypt() function supports multiple encryption types, the following constants are set to 0 or 1 depending on whether the given type is available:


    CRYPT_STD_DES - Standard DES-based encryption with a two character salt

    CRYPT_EXT_DES - Extended DES-based encryption with a nine character salt

    CRYPT_MD5 - MD5 encryption with a twelve character salt starting with $1$

    CRYPT_BLOWFISH - Blowfish encryption with a sixteen character salt starting with $2$ or $2a$

    Note: There is no decrypt function, since crypt() uses a one-way algorithm.

    Examples[edit]

    Example 1. crypt() examples
    
    <?php
    $password = crypt('mypassword'); // let the salt be automatically generated
    
    /* You should pass the entire results of crypt() as the salt for comparing a
       password, to avoid problems when different hashing algorithms are used. (As
       it says above, standard DES-based password hashing uses a 2-character salt,
       but MD5-based hashing uses 12.) */
    if (crypt($user_input, $password) == $password) {
       echo "Password verified!";
    }
    ?>
    
    Example 2. Using crypt() with htpasswd
    
    <?php
    // Set the password
    $password = 'mypassword';
    
    // Get the hash, letting the salt be automatically generated
    $hash = crypt($password);
    ?>
    
    Example 3. Using crypt() with different encryption types
    <?php
    if (CRYPT_STD_DES == 1) {
       echo 'Standard DES: ' . crypt('rasmuslerdorf', 'rl') . "\n";
    }
    
    if (CRYPT_EXT_DES == 1) {
       echo 'Extended DES: ' . crypt('rasmuslerdorf', '_J9..rasm') . "\n";
    }
    
    if (CRYPT_MD5 == 1) {
       echo 'MD5:          ' . crypt('rasmuslerdorf', '$1$rasmusle$') . "\n";
    }
    
    if (CRYPT_BLOWFISH == 1) {
       echo 'Blowfish:    ' . crypt('rasmuslerdorf', '$2a$07$rasmuslerd...........$') . "\n";
    }
    ?>
    
    The above example will output something similar to:
    
    Standard DES: rl.3StKT.4T8M
    Extended DES: _J9..rasmBYk8r9AiWNc
    MD5:          $1$rasmusle$rISCgZzpwk3UhDidwXvin0
    Blowfish:     $2a$07$rasmuslerd............nIdrcHdxcUxWomQX9j6kvERCFjTg7Ra
    
    See also md5() and the Mcrypt extension. 
    

    from php.net/crypt


    Source code to the Unix crypt() function


    Using <crypt> on this wiki[edit]

    You can use this Wiki to encrypt your passwords on the fly:

    <crypt>fnord</crypt>

    will return

    <crypt>fnord</crypt>

    The CryptExtension[edit]

    the source for enabling this on Mediawiki is very simple,it just uses the PHP crypt function

    <?php
    # crypt mediawiki extension
    # by mutante 18.03.2005
    
    $wgExtensionFunctions[] = "wfCryptExtension";
    
    function wfCryptExtension() {
    global $wgParser;
    $wgParser->setHook( "crypt", "renderCrypt" );
    }
    
    function renderCrypt( $input ) {
    
    $input = mysql_escape_string($input);
    
    $output=crypt('$input'); // http://www.php.net/crypt
    
    return $output;
    }
    ?>
    

    yep,nothing i really had to do by myself. mutante

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