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(PHP 4 >= 4.2.0, PHP 5)

openssl_csr_sign -- Sign a CSR with another certificate (or itself) and generate a certificate

Description

resource openssl_csr_sign ( mixed csr, mixed cacert, mixed priv_key, int days [, array configargs [, int serial]] )

openssl_csr_sign() generates an x509 certificate resource from the csr previously generated by openssl_csr_new() , but it can also be the path to a PEM encoded CSR when specified as file://path/to/csr or an exported string generated by openssl_csr_export() . The generated certificate will be signed by cacert . If cacert is NULL , the generated certificate will be a self-signed certificate. priv_key is the private key that corresponds to cacert . days specifies the length of time for which the generated certificate will be valid, in days. You can finetune the CSR signing by configargs . See openssl_csr_new() for more information about configargs . Since PHP 4.3.3 you can specify the serial number of issued certificate by serial . In earlier versions, it was always 0.

Returns an x509 certificate resource on success, FALSE on failure.

Example 1. openssl_csr_sign() example - signing a CSR (how to implement your own CA)

<?php
// Let's assume that this script is set to receive a CSR that has
// been pasted into a textarea from another page
$csrdata = $_POST["CSR"];

// We will sign the request using our own "certificate authority"
// certificate.  You can use any certificate to sign another, but
// the process is worthless unless the signing certificate is trusted
// by the software/users that will deal with the newly signed certificate

// We need our CA cert and its private key
$cacert = "file://path/to/ca.crt";
$privkey = array("file://path/to/ca.key", "your_ca_key_passphrase");

$userscert = openssl_csr_sign($csrdata, $cacert, $privkey, 365);

// Now display the generated certificate so that the user can
// copy and paste it into their local configuration (such as a file
// to hold the certificate for their SSL server)
openssl_x509_export($usercert, $certout);
echo $certout;

// Show any errors that occurred here
while (($e = openssl_error_string()) !== false) {
    echo $e . "\n";
}
?>

Related Function(s)

openssl_csr_new()

openssl_csr_export()