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from M2Crypto import X509

...
    pubkey.verify_init()
    pubkey.verify_update(data)
    return pubkey.verify_final(rawsig)

my $x509 = Crypt::OpenSSL::X509->new_from_file('cert.pm');
my $pubkey = $x509->pubkey();
my $signature = read_file('signature.txt' , binmode => ':raw' );
my $data =  read_file('data.txt' , binmode => ':raw' );

openssl x509 -in cert.pem -pubkey >& pubkey.txt
openssl dgst -sha256 -verify pubkey.txt -signature signature.txt myDat
+a.txt