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# openssl_csr_sign

(PHP 4 >= 4.2.0)

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.

> Nota: 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.

Exemplo 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";
}
?>`

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