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# openssl_csr_sign

(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.

> 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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