私钥pfx转pem

//filePath为pfx文件路径
function signfrompfx($strData,$filePath,$keyPass)
    {
       
        if(!file_exists($filePath)) {
            return false;
        }
 
        $pkcs12 = file_get_contents($filePath);
 
        if (openssl_pkcs12_read($pkcs12, $certs, $keyPass)) {
            $privateKey = $certs['pkey'];
 
 
 
            $publicKey = $certs['cert'];
            $signedMsg = "";
            if (openssl_sign($strData, $signedMsg, $privateKey)) {
        $signedMsg=bin2hex($signedMsg);//这个看情况。有些不需要转换成16进制，有些需要base64编码。看各个接口
                return $signedMsg;
            } else {
                return '';
            }
        } else {
            return '0';
        }
    }
公钥cer转pem（即x.509证书dem格式转换为pem）

function verifyReturn($data,$signature,$filePath){
 
/*
filePath为crt,cert文件路径。x.509证书
cer to dem， Convert .cer to .pem, cURL uses .pem
*/
 
$certificateCAcerContent = file_get_contents($filePath);
$certificateCApemContent =  '-----BEGIN CERTIFICATE-----'.PHP_EOL
    .chunk_split(base64_encode($certificateCAcerContent), 64, PHP_EOL)
    .'-----END CERTIFICATE-----'.PHP_EOL;*/
  file_put_contents('文件地址',$certificateCApemContent);把.cer公钥转成.pem保存

    $pubkeyid = openssl_get_publickey($certificateCApemContent);
 
  $len = strlen($signature);
  $signature= pack("H" . $len, $signature); //Php-16进制转换为2进制,看情况。有些接口不需要，有些需要base64解码
 
$data=str_replace('', '', $data);//这个看情况。
    // state whether signature is okay or not
    $ok = openssl_verify($data, $signature, $pubkeyid);
    openssl_free_key($pubkeyid);
    return $ok;
}