脚本宝典收集整理的这篇文章主要介绍了在php中从smtp获取证书，脚本宝典觉得挺不错的，现在分享给大家，也给大家做个参考。
我可以将其打开为“tcp：//”,并在发送“STARTTLS”命令后将其切换为“ssl：//”吗？
function ssl_fetch_cert($domain,$port = 443) { $url = "ssl://{$domain}:{$port}"; $connection_context_option['ssl']['capture_PEer_cert'] = TRUE; $connection_context = stream_context_create($connection_context_option); $connection_client = stream_socket_client($url,$errno,$errstr,30,STREAM_CLIENT_CONNECT,$connection_context); $connection_info = stream_context_get_params($connection_client); // $sha256 = openssl_x509_fingerPRint($connection_info['options']['ssl']['peer_certificate'],'sha256'); return $connection_info['options']['ssl']['peer_certificate']; }
$url = "tcp://{$domain}:{$port}";
$connection_client = stream_socket_client($url,$connection_context);
// timeout fread after 2s
stream_set_timeout($connection_client,2);
// let the server introduce IT self before sending command
fread($connection_client,10240);
// send STARTTLS command
fwrite($connection_client,"STARTTLS\n");
// wait for server to say its ready,before switching
fread($connection_client,10240);
// Switching to SSL/TLS
stream_socket_enable_crypto($connection_client,TRUE,STREAM_CRYPTO_METHOD_SSLv23_CLIENT);
https://github.com/puggan/tlsa_validation_php/blob/master/functions.php#L111
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