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); }