(PHP 4 >= 4.2.0, PHP 5, PHP 7)
openssl_csr_new — Generates a CSR
$dn
, resource &$privkey
[, array $configargs
[, array $extraattribs
]] )
openssl_csr_new() generates a new CSR (Certificate Signing Request)
based on the information provided by dn, which represents the
Distinguished Name to be used in the certificate.
Note: You need to have a valid openssl.cnf installed for this function to operate correctly. See the notes under the installation section for more information.
dnThe Distinguished Name to be used in the certificate.
privkey
privkey should be set to a private key that was
previously generated by openssl_pkey_new() (or
otherwise obtained from the other openssl_pkey family of functions).
The corresponding public portion of the key will be used to sign the
CSR.
configargs
By default, the information in your system openssl.conf
is used to initialize the request; you can specify a configuration file
section by setting the config_section_section key of
configargs. You can also specify an alternative
openssl configuration file by setting the value of the
config key to the path of the file you want to use.
The following keys, if present in configargs
behave as their equivalents in the openssl.conf, as
listed in the table below.
configargs key |
type | openssl.conf equivalent | description |
|---|---|---|---|
| digest_alg | string | default_md | Selects which digest method to use |
| x509_extensions | string | x509_extensions | Selects which extensions should be used when creating an x509 certificate |
| req_extensions | string | req_extensions | Selects which extensions should be used when creating a CSR |
| private_key_bits | integer | default_bits | Specifies how many bits should be used to generate a private key |
| private_key_type | integer | none | Specifies the type of private key to create. This can be one
of OPENSSL_KEYTYPE_DSA,
OPENSSL_KEYTYPE_DH or
OPENSSL_KEYTYPE_RSA.
The default value is OPENSSL_KEYTYPE_RSA which
is currently the only supported key type.
|
| encrypt_key | boolean | encrypt_key | Should an exported key (with passphrase) be encrypted? |
| encrypt_key_cipher | integer | none | One of cipher constants. |
extraattribs
extraattribs is used to specify additional
configuration options for the CSR. Both dn and
extraattribs are associative arrays whose keys are
converted to OIDs and applied to the relevant part of the request.
Returns the CSR.
Example #1 Creating a self-signed-certificate
<?php
// Fill in data for the distinguished name to be used in the cert
// You must change the values of these keys to match your name and
// company, or more precisely, the name and company of the person/site
// that you are generating the certificate for.
// For SSL certificates, the commonName is usually the domain name of
// that will be using the certificate, but for S/MIME certificates,
// the commonName will be the name of the individual who will use the
// certificate.
$dn = array(
"countryName" => "UK",
"stateOrProvinceName" => "Somerset",
"localityName" => "Glastonbury",
"organizationName" => "The Brain Room Limited",
"organizationalUnitName" => "PHP Documentation Team",
"commonName" => "Wez Furlong",
"emailAddress" => "wez@example.com"
);
// Generate a new private (and public) key pair
$privkey = openssl_pkey_new();
// Generate a certificate signing request
$csr = openssl_csr_new($dn, $privkey);
// You will usually want to create a self-signed certificate at this
// point until your CA fulfills your request.
// This creates a self-signed cert that is valid for 365 days
$sscert = openssl_csr_sign($csr, null, $privkey, 365);
// Now you will want to preserve your private key, CSR and self-signed
// cert so that they can be installed into your web server, mail server
// or mail client (depending on the intended use of the certificate).
// This example shows how to get those things into variables, but you
// can also store them directly into files.
// Typically, you will send the CSR on to your CA who will then issue
// you with the "real" certificate.
openssl_csr_export($csr, $csrout) and var_dump($csrout);
openssl_x509_export($sscert, $certout) and var_dump($certout);
openssl_pkey_export($privkey, $pkeyout, "mypassword") and var_dump($pkeyout);
// Show any errors that occurred here
while (($e = openssl_error_string()) !== false) {
echo $e . "\n";
}
?>