private bool verifycert(bcertificate cert)
{
rsakey bpbkey = cert.getbroker().bpbk;
string mess = cert.getbroker().ToString() + "," + cert.getuser() + "," + cert.getaddress() + "," + cert.getukey().ToString() + "," + cert.getexp().ToString() + "," + cert.getinfo();
BigInteger messh = hashf.hash(mess);
return rsa.verifySig(messh, cert.getsigB(), bpbkey);
}
