GOST algorithm

[shoegazer-ru]

Hey!
How can i implement GOST signature algorithm?
I have openssl with required ciphers, but it looks like this lib not use openssl.

I have this error

Unsupported signature algorithm 1.2.643.7.1.1.3.2.

i have this code

$seq = Sequence::fromDER($binaryData);
$signed_data = $seq->getTagged(0)->asExplicit()->asSequence();
$ecac = $signed_data->getTagged(0)->asImplicit(Element::TYPE_SET)->asSet();
$ecoc = $ecac->at($ecac->count() - 1);
$cert = Certificate::fromASN1($ecoc->asSequence());
$tbsCert = $cert->tbsCertificate();

maybe you can advice me how to use openssl to parse signature data?
im parsing pdf files to retrieve signature data like author, serialNumber and dates