openssl_csr_sign()

(PHP 4 >= 4.2.0, PHP 5, PHP 7)

用另一个证书签署 CSR(或者本身)并且生成一个证书

说明

openssl_csr_sign(mixed $csr, mixed $cacert, mixed $priv_key,int $days[,array $configargs[,int $serial= 0]]): resource

openssl_csr_sign()从给定的 CSR 生成一个x509证书资源

Note:必须安装有效的openssl.cnf以保证此函数正确运行。参考有关安装的说明以获得更多信息。

参数

$csr: 由openssl_csr_new()函数生成的CSR.也可以是由类似file://path/to/csr格式指定的指向PEM编码的CSR路径，或者是一个由openssl_csr_export()函数生成的字符串。
$cacert: 生成的证书将由$cacert签名。如果$cacert为NULL,生成的证书将是自签名证书。
$priv_key: $priv_key是$cacert证书对应的私钥。
$days: $days指定生成的证书在几天内有效的时间长度。
$configargs: 你可以通过$configargs确定CSR签名。查看openssl_csr_new()方法获取$configargs的更多相关信息。
$serial: 可选的发行证书编号。如果没有指定默认值为0.

返回值

成功，返回一个 x509 证书资源，失败则返回FALSE.

范例

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");
$usercert = openssl_csr_sign($csrdata, $cacert, $privkey, 365, array('digest_alg'=>'sha256') );
// Now display the generated certificate so that the user can
// copy and paste it into their local configuration (such as a file
// to hold the certificate for their SSL server)
openssl_x509_export($usercert, $certout);
echo $certout;
// Show any errors that occurred here
while (($e = openssl_error_string()) !== false) {
    echo $e . "\n";
}
?>

config_section_section is incorrect. The correct keyword to use is "config_section_name".

Here is an sample how to create valid X.509 Public and Private Key (cert/key).
When not using self signed the 4.2.1 segault. You need the CVS code at least for openssl.
<?
Header("Content-Type: text/plain");
$CA_CERT = "CA.cert.pem";
$CA_KEY = "CA.key.pem";
$req_key = openssl_pkey_new();
if(openssl_pkey_export ($req_key, $out_key)) {
    $dn = array(
        "countryName"      => "DE",
        "stateOrProvinceName"  => "Frankfurt",
        "organizationName"    => "smcc.net",
        "organizationalUnitName" => "E-Mail",
        "commonName"       => "Testcert"
        );
    $req_csr = openssl_csr_new ($dn, $req_key);
    $req_cert = openssl_csr_sign($req_csr, "file://$CA_CERT", "file://$CA_KEY", 365);
    if(openssl_x509_export ($req_cert, $out_cert)) {
        echo "$out_key\n";
        echo "$out_cert\n";
        }
    else  echo "Failed Cert\n";
    }
else      echo "FailedKey\n";
?>

To generate a self-signed certificate, pass NULL as the signing certificate (2nd parameter). For example:
$req_key = openssl_pkey_new();
$dn = array(
  "countryName" => "US",
  "stateOrProvinceName" => "Colorado",
  "organizationName" => "yPass.net",
  "organizationalUnitName" => "yPass.net",
  "commonName" => "yPass.net Root Certificate"
);
$req_csr = openssl_csr_new($dn, $req_key);
$req_cert = openssl_csr_sign($req_csr, NULL, $req_key, 365);

You can use file_get_contents() to directly pass the content instead of giving file paths.
Also, if you get an error "sec_error_reused_issuer_and_serial", put a serial into the last parameter:
<?php
$privkey = array(file_get_contents('ca.key'),"your_ca_key_passphrase");
$usercert = openssl_csr_sign($csrdata, file_get_contents('ca.crt'),$privkey,365,NULL,'06');
openssl_x509_export($usercert,$certout);
file_put_contents('serverCASigned.crt',$certout);
?>
In that above example the serial was "06".