PHP中使用OpenSSL生成证书及加密解密

依赖于OpenSSL扩展

/*加密解密*/function authcode($string, $operation = 'E') {    $ssl_public = file_get_contents(DATA_PATH."/conf/cert_public.key");    $ssl_private = file_get_contents(DATA_PATH."/conf/cert_private.pem");    $pi_key =  openssl_pkey_get_private($ssl_private);//这个函数可用来判断私钥是否是可用的，可用返回资源id Resource id    $pu_key = openssl_pkey_get_public($ssl_public);//这个函数可用来判断公钥是否是可用的    if(false == ($pi_key || $pu_key)) return '证书错误';    $data = "";    if($operation=='D'){        openssl_private_decrypt(base64_decode($string),$data,$pi_key);//私钥解密    }else{        openssl_public_encrypt($string,$data,$pu_key);//公钥加密        $data = base64_encode($data);    }    return $data;}/*生成证书*/function exportOpenSSLFile(){    $config = array(        "digest_alg"       => "sha512",        "private_key_bits" => 4096,                     //字节数    512 1024  2048   4096 等        "private_key_type" => OPENSSL_KEYTYPE_RSA,     //加密类型    );    $res = openssl_pkey_new($config);    if($res == false) return false;    openssl_pkey_export($res, $private_key);    $public_key = openssl_pkey_get_details($res);    $public_key = $public_key["key"];    file_put_contents(DATA_PATH."/conf/cert_public.key",$public_key);    file_put_contents(DATA_PATH."/conf/cert_private.pem",$private_key);    openssl_free_key($res);}