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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, long days)

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.

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

> 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.

Example 1. openssl_csr_sign() example - signing a CSR (how to implement your own CA)
    // 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 it's 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) and echo $certout;

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

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