Return True if the certificate is self-signed:
          - issuer and subject are the same
          - the signature of the certificate is valid.

def isSelfSigned(self):
        """
        Return True if the certificate is self-signed:
          - issuer and subject are the same
          - the signature of the certificate is valid.
        """
        if self.issuer_hash == self.subject_hash:
            return self.isIssuerCert(self)
        return False