Create a new article
Write your page title here:
We currently have 3,187 articles on s23. Type your article name above or create one of the articles listed here!


    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.


    Example 1. crypt() examples
    $password = crypt('mypassword'); // let the salt be automatically generated
    /* You should pass the entire results of crypt() as the salt for comparing a
       password, to avoid problems when different hashing algorithms are used. (As
       it says above, standard DES-based password hashing uses a 2-character salt,
       but MD5-based hashing uses 12.) */
    if (crypt($user_input, $password) == $password) {
       echo "Password verified!";
    Example 2. Using crypt() with htpasswd
    // 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
    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:


    will return


    The CryptExtension[edit]

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

    # 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

    Cookies help us deliver our services. By using our services, you agree to our use of cookies.
    Cookies help us deliver our services. By using our services, you agree to our use of cookies.