mhash
OpenSSL creates asynchronous key pairs, however I wanted to have the private key something that was human-memorizable. With the standard keys generated, this is not possible. How I achieved it was to use two types of encryption.
After generating a key pair with OpenSSL, the public key can be stored in plain text format. I then encrypted the private key itself using regular mcrypt with the human-memorizable key of my choice and converted it to ACSII using base64_encode. Then to get the private key back, I just decrypted it with mcrypt. This way I could store the encrypted private key on the server without worrying about having things stored unencrypted.
Of course, this will only be as good as your human-memorizable key is and can potentially reduce the security of your script if you choose something simple or don't use salts.
OpenSSL
- Introduction
- Installation/Configuration
- Constantes pré-définies
- Paramètres clés/certificats
- Vérification de certificats
- Fonctions OpenSSL
- openssl_csr_export_to_file — Exporte une CSR vers un fichier
- openssl_csr_export — Exporte un CSR vers un fichier ou une variable
- openssl_csr_get_public_key — Retourne la clé publique d'un CERT
- openssl_csr_get_subject — Retourne le sujet d'un CERT
- 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 — Decrypts data
- openssl_dh_compute_key — Computes shared secret for public value of remote DH key and local DH key
- openssl_digest — Computes a digest
- openssl_encrypt — Encrypts data
- openssl_error_string — Retourne le message d'erreur OpenSSL
- openssl_free_key — Libère les ressources
- openssl_get_cipher_methods — Gets available cipher methods
- openssl_get_md_methods — Gets available digest methods
- 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_pkcs12_export_to_file — Exporte un certificat compatible PKCS#12
- openssl_pkcs12_export — Exporte un certificat compatible PKCS#12 dans une variable
- 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_sign — Signe un message S/MIME
- openssl_pkcs7_verify — Vérifie la signature d'un message S/MIME
- openssl_pkey_export_to_file — Sauve une clé au format ASCII dans un fichier
- openssl_pkey_export — Stocke une représentation exportable de la clé dans une chaîne de caractères
- openssl_pkey_free — Libère une clé privée
- openssl_pkey_get_details — Retourne un tableau contenant le détail d'une clé
- openssl_pkey_get_private — Lit une clé privée
- openssl_pkey_get_public — Extrait une clé privée 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 — Generate a pseudo-random string
- openssl_seal — Scelle des données
- openssl_sign — Signe les données
- 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_to_file — Exporte un certificat vers un fichier
- openssl_x509_export — Exporte un certificat vers une chaîne de caractères
- 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 une ressource
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User Contributed NotesOpenSSL
Anonymous
08-Oct-2009 02:28
08-Oct-2009 02:28
bdh dot hall at gmail dot com
30-May-2009 12:18
30-May-2009 12:18
I was having a heck of a time finding help on making asynchronous encryption/decryption using private key/public key systems working, and I had to have it for creating a credit card module that uses recurring billing.
You'd be a fool to use normal, 'synchronous' or two-way encryption for this, so the whole mcrypt library won't help.
But, it turns out OpenSSL is extremely easy to use...yet it is so sparsely documented that it seems it would be incredibly hard.
So I share my day of hacking with you - I hope you find it helpful!
<?php
if (isset($_SERVER['HTTPS']) )
{
echo "SECURE: This page is being accessed through a secure connection.<br><br>";
}
else
{
echo "UNSECURE: This page is being access through an unsecure connection.<br><br>";
}
// Create the keypair
$res=openssl_pkey_new();
// Get private key
openssl_pkey_export($res, $privatekey);
// Get public key
$publickey=openssl_pkey_get_details($res);
$publickey=$publickey["key"];
echo "Private Key:<BR>$privatekey<br><br>Public Key:<BR>$publickey<BR><BR>";
$cleartext = '1234 5678 9012 3456';
echo "Clear text:<br>$cleartext<BR><BR>";
openssl_public_encrypt($cleartext, $crypttext, $publickey);
echo "Crypt text:<br>$crypttext<BR><BR>";
openssl_private_decrypt($crypttext, $decrypted, $privatekey);
echo "Decrypted text:<BR>$decrypted<br><br>";
?>
Many thanks to other contributors in the docs for making this less painful.
Note that you will want to use these sorts of functions to generate a key ONCE - save your privatekey offline for decryption, and put your public key in your scripts/configuration file. If your data is compromised you don't care about the encrypted stuff or the public key, it's only the private key and cleartext that really matter.
Good luck!
koen dot thomeer at pubmed dot be
31-Aug-2008 07:27
31-Aug-2008 07:27
For checking the status of a client certificate using OCSP, you can use this script:
<?php
// User variables:
$dir = '/path/to/temp/'; // Directory where apache has access to (chmod 777).
$RootCA = '/path/to/Root.cer'; // Points to the Root CA in PEM format.
$OCSPUrl = 'http://ocsp.url'; //Points to the OCSP URL
// Script:
$a = rand(1000,99999); // Needed if you expect more page clicks in one second!
file_put_contents($dir.$a.'cert_i.pem', $_SERVER['SSL_CLIENT_CERT_CHAIN_0']); // Issuer certificate.
file_put_contents($dir.$a.'cert_c.pem', $_SERVER['SSL_CLIENT_CERT']); // Client (authentication) certificate.
$output = shell_exec('openssl ocsp -CAfile '.$RootCA.' -issuer '.$dir.$a.'cert_i.pem -cert '.$dir.$a.'cert_c.pem -url '.$OCSPUrl);
$output2 = preg_split('/[\r\n]/', $output);
$output3 = preg_split('/: /', $output2[0]);
$ocsp = $output3[1];
echo "OCSP status: ".$ocsp; // will be "good", "revoked", or "unknown"
unlink($dir.$a.'cert_i.pem');
unlink($dir.$a.'cert_c.pem');
?>
It can be ameliorated, but it's just a beginning!
Normally, you can extract the ocsp url from the client certificate. Also, an OCSP request contains only the hash of the issuer name, the hash of the issuer's key, and the serial number of the client certificate. All three can be extracted directly from the client certificate.