Fonctions OpenSSL

Sommaire

openssl_cipher_iv_length — Récupère la longueur cipher iv
openssl_cipher_key_length — Renvoie la longueur de la clé de chiffrement
openssl_cms_decrypt — Déchiffre un message CMS
openssl_cms_encrypt — Chiffre un message CMS
openssl_cms_read — Exporte le fichier CMS vers un tableau de certificats PEM
openssl_cms_sign — Signe un fichier
openssl_cms_verify — Vérifie une signature CMS
openssl_csr_export — Exporte un CSR vers un fichier ou une variable
openssl_csr_export_to_file — Exporte une CSR vers un fichier
openssl_csr_get_public_key — Retourne la clé publique d'un CSR
openssl_csr_get_subject — Retourne le sujet d'une CSR
openssl_csr_new — Génère une CSR
openssl_csr_sign — Signe un CSR avec un autre certificat (ou lui-même) et génère un certificat
openssl_decrypt — Déchiffrer les données
openssl_dh_compute_key — Calcule un secret partagé pour une valeur publique de la clé DH publique distante et la clé DH locale
openssl_digest — Calcule un digest
openssl_encrypt — Chiffre les données
openssl_error_string — Retourne le message d'erreur OpenSSL
openssl_free_key — Libère les ressources
openssl_get_cert_locations — Récupère les chemins vers les certificats disponibles
openssl_get_cipher_methods — Récupère la liste des méthodes de chiffrements disponibles
openssl_get_curve_names — Récupère la liste des noms de courbes disponibles pour ECC
openssl_get_md_methods — Récupère la liste des méthodes digest disponibles
openssl_get_privatekey — Alias de openssl_pkey_get_private
openssl_get_publickey — Alias de openssl_pkey_get_public
openssl_open — Ouvre des données scellées
openssl_pbkdf2 — Génère une chaîne PKCS5 v2 PBKDF2
openssl_pkcs12_export — Exporte un certificat compatible PKCS#12 dans une variable
openssl_pkcs12_export_to_file — Exporte un certificat compatible PKCS#12
openssl_pkcs12_read — Lit un certificat PKCS#12 dans un tableau
openssl_pkcs7_decrypt — Déchiffre un message S/MIME
openssl_pkcs7_encrypt — Chiffre un message S/MIME
openssl_pkcs7_read — Exporte le fichier PKCS7 vers un tableau de certificats PEM
openssl_pkcs7_sign — Signe un message S/MIME
openssl_pkcs7_verify — Vérifie la signature d'un message S/MIME
openssl_pkey_derive — Calcule le secret partagé pour la valeur publique de la clé DH ou ECDH distante et locale
openssl_pkey_export — Stocke une représentation exportable de la clé dans une chaîne de caractères
openssl_pkey_export_to_file — Sauve une clé au format ASCII dans un fichier
openssl_pkey_free — Libère une clé privée
openssl_pkey_get_details — Retourne un tableau contenant les détails de la clé
openssl_pkey_get_private — Lit une clé privée
openssl_pkey_get_public — Extrait une clé publique d'un certificat, et la prépare
openssl_pkey_new — Génère une nouvelle clé privée
openssl_private_decrypt — Déchiffre des données avec une clé privée
openssl_private_encrypt — Chiffre des données avec une clé privée
openssl_public_decrypt — Déchiffre des données avec une clé publique
openssl_public_encrypt — Chiffre des données avec une clé publique
openssl_random_pseudo_bytes — Génère une chaine pseudo-aléatoire d'octets
openssl_seal — Scelle des données
openssl_sign — Signe les données
openssl_spki_export — Exporte un PEM valide formaté comme une clé publique signée
openssl_spki_export_challenge — Exporte le challenge associé avec la clé publique signée
openssl_spki_new — Génère une clé publique signée et effectue un challenge
openssl_spki_verify — Vérifie une clé publique signée, et effectue un challenge
openssl_verify — Vérifie une signature
openssl_x509_check_private_key — Vérifie si une clé privée correspond à un certificat
openssl_x509_checkpurpose — Vérifie l'usage d'un certificat
openssl_x509_export — Exporte un certificat vers une chaîne de caractères
openssl_x509_export_to_file — Exporte un certificat vers un fichier
openssl_x509_fingerprint — Calcule l'empreinte, ou le digest d'un certificat X.509 donné
openssl_x509_free — Libère les ressources prises par un certificat
openssl_x509_parse — Analyse un certificat X509
openssl_x509_read — Analyse un certificat X.509 et retourne un objet
openssl_x509_verify — Vérifie la signature digitale d'un certificat x509 par rapport à une clé publique

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User Contributed Notes 24 notes

down

dan -AT- NOSPAM danschafer DOT netTT ¶

17 years ago

Currently, all OpenSSL Functions defined in PHP only utilize the PEM format.  Use the following code to convert from DER to PEM and PEM to DER.

<?php
$pem_data = file_get_contents($cert_path.$pem_file);
$pem2der = pem2der($pem_data);

$der_data = file_get_contents($cert_path.$der_file);
$der2pem = der2pem($der_data);

function pem2der($pem_data) {
   $begin = "CERTIFICATE-----";
   $end   = "-----END";
   $pem_data = substr($pem_data, strpos($pem_data, $begin)+strlen($begin));    
   $pem_data = substr($pem_data, 0, strpos($pem_data, $end));
   $der = base64_decode($pem_data);
   return $der;
}

function der2pem($der_data) {
   $pem = chunk_split(base64_encode($der_data), 64, "\n");
   $pem = "-----BEGIN CERTIFICATE-----\n".$pem."-----END CERTIFICATE-----\n";
   return $pem;
}
?>

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skippy zuavra net ¶

20 years ago

In case you're wondering what's a "correctly hashed" directory for the use with cainfo: it's simply a directory which contains CA public certificates in PEM/X.509 format. You can get such certificates either from the CA's website (they advertise it in visible places) or from your browser. In Explorer for instance you can click on the little yellow padlock, go to the CA entry and export it.

The only trick with the directory is that file names must be in the form "hash.#". The "hash" part is the 8-digit hex hash of the certificate, while the # part is a number which serves to differentiate certificates which give the same hash (yes, it can happen with certificates coming from the same CA). Usually # is 0, but you also can use 1, 2 and so on when having more certs with the same hash.

In order to obtain the hash of a certificate you can use the openssl command line utility like this:

openssl x509 -hash -in certfile.cer | head -1

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peter dot mescalchin @ geemail dot com ¶

18 years ago

For w32 users to enable OpenSSL support. As well as copying "libeay32.dll" to the windows system32 folder you also need to copy "ssleay32.dll".  The documentation above should probably be updated to note this.

This requirement was documented at the libcurl pages:

http://curl.haxx.se/libcurl/php/install.html#windows

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kraven at kraven dot org ¶

11 years ago

If you want to verify that a csr was generated properly from your private key you can do the following:



<?php

$countryName = "UK";

$stateOrProvinceName = "London";

$localityName = "Blah";

$organizationName = "Blah1";

$organizationalUnitName = "Blah2";

$commonName = "Joe Bloggs";

$emailAddress = "openssl@example.com";



$dn = array(

  "countryName" => $countryName,

  "stateOrProvinceName" => $stateOrProvinceName,

  "localityName" => $localityName,

  "organizationName" => $organizationName,

  "organizationalUnitName" => $organizationalUnitName,

  "commonName" => $commonName,

  "emailAddress" => $emailAddress

);



$badPriv = 'foo';



// generate a bad csr

$badCsr = openssl_csr_new($dn, $badPriv);



// generate private key

$priv = openssl_pkey_new();



// generate csr

$csr = openssl_csr_new($dn, $priv);



$badCsrDetails = openssl_pkey_get_details(openssl_csr_get_public_key($badCsr));

$privDetails = openssl_pkey_get_details($priv);

$csrDetails = openssl_pkey_get_details(openssl_csr_get_public_key($csr));



echo md5($badCsrDetails['rsa']['n']);

echo "\nDoes not match\n";

echo md5($privDetails['rsa']['n']);

echo "\nMatches\n";

echo md5($csrDetails['rsa']['n']);

echo "\n";

?>



This output is an md5 hash of the modulus.  The same check can be accomplished with openssl:

openssl rsa -noout -modulus -in server.key | openssl md5

openssl req -noout -modulus -in server.csr | openssl md5

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jts ¶

17 years ago

Win32 users having trouble getting php_openssl to work should make sure that they replace ALL the versions of libeay32.dll and ssleay32.dll, with the ones included with PHP.  This is especially true while using Apache2 and OpenSSL together, as some OpenSSL win32 packages include older versions of these two files.

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greensweater ¶

19 years ago

"You need to have a valid openssl.cnf installed for this function to operate correctly" includes most openssl functions. You can force php to find your openssl.cnf file as follows:

$config = array('config'=>'/path/to/openssl.cnf');
$pkey = openssl_pkey_new($config);
$csr = openssl_csr_new('MyCSR',$pkey,$config);

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rahuul at yours dot com ¶

14 years ago

for changing serial no of cert following is the solution:



<?php

$sscert = openssl_csr_sign($csr, $cacert, $privkey, $days,$config,$serial);

?>

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yabba dabba ¶

18 years ago

The php4 distribution for Windows/IIS has a README-SSL.txt which strongly implies that just the path needs to be added to the OPENSLL_CONF variable in the server's environment variables. Be sure to add the file name and extension too.

E.g.: c:\php-4.3.11\openssl\openssl.cnf

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web at mburda dot com ¶

16 years ago

There is a little problem with Matt Alexander's code below.
Both public and private key are generated internally and saved into OpenSSL class object properties but only private key is then used.
Public key is taken from an external file and if it differs from the one stored internally, OpenSSL fails to decrypt the text.

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stephen_at_liberty-irm_dot_com ¶

16 years ago

This note is primarily aimed at folks storing encrypted things in MySQL as I'm unfamiliar with other database setups. If you store, for example, a credit card number that has been encrypted by openssl_public_encrypt inside of a database, the column type for the column you are storing the number in must be a blob. This is because "the result might contain arbitrary byte values" (MySQL Reference Manual). Basically, if you try to store it in a VARCHAR, LONGTEXT, etc, certain parts of the encrypted data may be dropped, truncated, etc. This will of course make the data impossible to decrypt. Hopefully this will help someone, because it had me stumped for about an hour!

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karel dot wintersky at gmail dot com ¶

7 years ago

May be useful for cyphers execution speed.

<?php
// PHP 7.0+ required!
// see results at https://gist.github.com/KarelWintersky/fe29dcad75de515e5a468894e7c070e6

const TEST_COUNT = 100000;
const SOURCE = 'Note that HTML tags are not allowed in the posts, but the note formatting is preserved.';
const KEY = "password";

function TESTER( $testing_function, $argument )
{
    $t = microtime(true);

    for ($test_iterator = 0; $test_iterator < TEST_COUNT; $test_iterator++) {
        $testing_function( $argument );
    }
    return round(microtime(true) - $t, 4);
}

$crypt = function($cipher) {
    $ivlen = openssl_cipher_iv_length($cipher);
    $iv = openssl_random_pseudo_bytes($ivlen);
    openssl_encrypt(SOURCE, $cipher, KEY, $options=0, $iv);
};

$methods = openssl_get_cipher_methods(false);

array_splice( $methods, 0, count($methods) / 2);

$timings = array();

foreach ($methods as $cypher) {
    $time = TESTER( $crypt, $cypher );
    $timings[ $cypher ] = $time;
    echo str_pad($cypher, 40, ' ', STR_PAD_LEFT), " have time  ", str_pad($time, 8, STR_PAD_LEFT), ' seconds. ', PHP_EOL;
}

uasort($timings, function($a, $b){
    return $a <=> $b;
});

$min_time = round(reset($timings) / TEST_COUNT, 7);
$min_cypher = key($timings);

$max_time = round(end($timings) / TEST_COUNT, 7);
$max_cypher = key($timings);

echo '-------------', PHP_EOL;
echo "Total tests: ", count($timings), PHP_EOL;
echo "Max timing : {$max_time} seconds for `{$max_cypher}` algorithm.", PHP_EOL;
echo "Min timing : {$min_time} seconds for `{$min_cypher}` algorithm.", PHP_EOL;

echo 'Details: ', PHP_EOL;

foreach ($timings as $m => $t) {
    echo '- ', str_pad($t, 8, STR_PAD_LEFT), " seconds for `{$m}`",  PHP_EOL;
}

echo PHP_EOL;

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kurian at net4ideas dot com ¶

17 years ago

For working of openssl in windows platform IIS webserver, we need to enable in php.ini, tne copy libeay32.dll and ssleay32.dll to the php folder (or windows's system32 folder) and add both dll's path to the window's PATH variable. It seems to be working for me after I did these changes.

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matt at NOSPAMopenflowsPLEASE dot org ¶

19 years ago

The openssl functions were disabled in Debian release 3.0 (woody), but as of release 3.1 (sarge) they're available again.

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greensweater ¶

19 years ago

Sorry, the code in my previous note doesn't work... the last line should read:

$csr = openssl_csr_new(array('commonName'=>'MyCSR'),$pkey,$config);

down

-1

Anonymous ¶

4 years ago

Improvement to the first comment, this function will handle correctly cert chains when converting from PEM to DER format:

<?php

    function pemToDer(string $pem_data): string
    {
        $der_data = '';

        $begin = "-----BEGIN CERTIFICATE-----";
        $end   = "-----END CERTIFICATE-----";
        while (strpos($pem_data, $begin) !== false) {
            $pem_data = substr($pem_data, strpos($pem_data, $begin) + strlen($begin));
            $der_data .= substr($pem_data, 0, strpos($pem_data, $end));
            $pem_data = substr($pem_data, strpos($pem_data, $end) + strlen($end));
        }

        return base64_decode($der_data);
    }

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jaz at ensn dot net ¶

20 years ago

For newbies (as me):
If you want to try at home on win32, you can learn how to install apache+ssl on this url: http://tud.at/programm/apache-ssl-win32-howto.php3

Versions on English, Spanish and French.

Just I have read and install and run perfectly.

down

norman at rasmussen dot org ¶

20 years ago

Debian maintainers have disabled the openssl support because it seems to help break apache on startup.  (http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=193343 and http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=165699)

- Norman

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daevid at daevid dot com ¶

17 years ago

There doesn't seem to be a function here to test if a cert is valid (i.e. not corrupt)... This bash snippet should help. Sorry it's not PHP. slap it in a system(); call or make it a bash script and call it that way or something...

if [ "`openssl x509 -in /etc/certs/my.crt -noout -modulus`" = "`openssl rsa -in /etc/keys/my.key -noout -modulus`" ]; then echo "Match"; else echo "Different"; fi

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Richard Ablewhite ¶

18 years ago

Windows users be warned that you need the following file in system32:

msvcr71.dll

It has to go in system32, is not picked up from php/dlls

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-1

ChronoFish ¶

17 years ago

There is a note below regarding the need to copy BOTH ssleay32.dll AND libeay32.dll to a folder in the system PATH on Win32 systems.

That is absolutely true.  It should be noted also that Windows will search the Windows system directories before it will search the PATH.  If you have existing .dlls in these directories - rename (rather than deleting in case you need to undo your changes) them and copy over the latest version of these files.

Key locations may include the /i386, /windows/system32, and ~/apache/.../modules directories.

I also updated my ~/subversion/bin directory.

-CF

down

-1

igor dot gorshkov at gmail dot com ¶

17 years ago

I generate certificates in such a way. 

$config = array("config" => "d:/sslcert/openssl.cnf");
$dn = array(
   "countryName" => "RU",
   "stateOrProvinceName" => "Russia",
   "localityName" => "Saint-Petersburg",
   "organizationName" => "temp",
   "organizationalUnitName" => "temp",
   "commonName" => "temp",
   "emailAddress" => "temp@temp.com"
);
$privkey_enc = openssl_pkey_new($config);
$csr = openssl_csr_new($dn, $privkey_enc, $config);
$sscert = openssl_csr_sign($csr, null, $privkey_enc, 365);
openssl_x509_export_to_file($sscert, "d:/cert_enc.crt");
openssl_pkey_export_to_file($privkey_enc, "d:/privkey_enc.pem");

As a result all the received certificates have identical serial number (00). But it should not be! How to avoid it?

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-3

mattalexx at gmail dot com ¶

17 years ago

Use this for simple public/private key encryption.

<?php

/**
 * Point to your config file
 *
 */
define("OPEN_SSL_CONF_PATH", "/usr/share/ssl/openssl.cnf");
/**
 * Length of time certificate is valid (in days)
 *
 */
define("OPEN_SSL_CERT_DAYS_VALID", 365);
/**
 * Passphrase required with private key
 *
 */
define("OPEN_SSL_PASSPHRASE", "lkdfjbjeyrasdfvkajwdeblsolkdkdjfbvzslalsmdbfvksb");
/**
 * Enter description here...
 *
 */
define("OPEN_SSL_PUBKEY_PATH", "/docs/domains/mywebsite.com/docs/key.pem"); // Public key path

/**
 * A wrapper class for a simple subset of the PHP OpenSSL functions. Use for public key encryption jobs.
 * 
 * <code>
 * 
 * // To configure
 * // 1. Set OPEN_SSL_CONF_PATH to the path of your openssl.cnf file.
 * // 2. Set OPEN_SSL_PASSPHRASE to any passphrase.
 * // 3. Use the OpenSSL::do_csr method to generate your private and public keys (see next section).
 * // 4. Save the private key somewhere offline and save your public key somewhere on this machine.
 * // 5. Set OPEN_SSL_PUBKEY_PATH to the public key's path.
 * 
 * // To generate keys
 * $ossl = new OpenSSL;
 * $ossl->do_csr();
 * $privatekey = $ossl->privatekey;
 * $publickey = $ossl->publickey;
 * unset($ossl);
 * 
 * // Encrypt
 * $text = "Secret text";
 * $ossl = new OpenSSL;
 * $ossl->encrypt($text);
 * $encrypted_text = $ossl->crypttext;
 * $ekey = $ossl->ekey;
 * unset($ossl);
 * 
 * // Decrypt
 * $ossl = new OpenSSL;
 * $decrypted_text = $ossl->decrypt($encrypted_text, $privatekey, $ekey);
 * unset($ossl);
 * 
 * @author Matt Alexander (mattalexx@gmail.com) [based on code by Alex Poole (php@wwwcrm.com)]
 * @copyright 2007
 * 
 */
class OpenSSL {
   
   public $privatekey;
   public $publickey;
   public $csr;
   public $crypttext;
   public $ekey;
    
   public function encrypt($plain) {
      
      // Turn public key into resource
      $publickey = openssl_get_publickey(is_file(OPEN_SSL_PUBKEY_PATH)? file_get_contents(OPEN_SSL_PUBKEY_PATH) : OPEN_SSL_PUBKEY_PATH);
      
      // Encrypt
      openssl_seal($plain, $crypttext, $ekey, array($publickey));
      openssl_free_key($publickey);
      
      // Set values
      $this->crypttext = $crypttext;
      $this->ekey = $ekey[0];
   }
 
   public function decrypt($crypt, $privatekey, $ekey="") {
   
      // Turn private key into resource
      $privatekey = openssl_get_privatekey((is_file($privatekey)? file_get_contents($privatekey) : $privatekey), OPEN_SSL_PASSPHRASE);
      
      // Decrypt
      openssl_open($crypt, $plaintext, $ekey, $privatekey);
      openssl_free_key($privatekey);
      
      // Return value
      return $plaintext;
   }

   public function do_csr( 
   $countryName = "UK",
   $stateOrProvinceName = "London",
   $localityName = "Blah",
   $organizationName = "Blah1",
   $organizationalUnitName = "Blah2",
   $commonName = "Joe Bloggs",
   $emailAddress = "openssl@domain.com"
   ) {         
      $dn = array(
         "countryName" => $countryName,
         "stateOrProvinceName" => $stateOrProvinceName,
         "localityName" => $localityName,
         "organizationName" => $organizationName,
         "organizationalUnitName" => $organizationalUnitName,
         "commonName" => $commonName,
         "emailAddress" => $emailAddress
         );
      $config = array(
         "config" => OPEN_SSL_CONF_PATH
         );
      $privkey = openssl_pkey_new();
      $csr = openssl_csr_new($dn, $privkey, $config);
      $sscert = openssl_csr_sign($csr, null, $privkey, OPEN_SSL_CERT_DAYS_VALID, $config);
      openssl_x509_export($sscert, $this->publickey);
      openssl_pkey_export($privkey, $this->privatekey, OPEN_SSL_PASSPHRASE, $config);
      openssl_csr_export($csr, $this->csr);
   }
   
}

?>

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-3

php ~at~ wwwcrm dot komm ¶

19 years ago

If you want to use PHP for public / private key encryption jobs without needing to know the ins and outs of the Open SSL extension, the following may be of interest:

http://www.karenandalex.com/php_stuff/_class_OpenSSL.phps

This class was unavailable for a long while (server problems) but is now back up. Apologies to those who clicked through and got a 404

I hope it is useful to you...

Alex

down

-3

beckman at purplecow dot com ¶

19 years ago

FreeBSD Ports tree php5-openssl uses openssl-0.9.8a.  This is a problem, as if you install these two ports and attempt to open an HTTPS URL within PHP, it will fail with this error from openssl_error_string(): error:140A90A1:SSL routines:func(169):reason(161) which is SSL_R_LIBRARY_HAS_NO_CIPHERS or "library has no ciphers"

This is because the openssl library now requires you to load your ciphers manually -- all ciphers are not automatically loaded for you.

I don't believe the php5-openssl module has been updated to do this before opening an SSL connection (as of 5.0.5). 

Using openssl-0.9.7i seems to work; symlinking libcrypto.so.3 to libcrypto.so.4 prevents the php5-openssl port from trying to install openssl-0.9.8a.  So install openssl-stable (0.9.7i) from ports first, symlink 2nd, then install php5-openssl 3rd, and you should be OK.

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