Method signTBSCert

scapy/layers/tls/cert.py:646–667

Note that this will always copy the signature field from the tbsCertificate into the signatureAlgorithm field of the result, regardless of the coherence between its contents (which might indicate ecdsa-with-SHA512) and the result (e.g. RSA signing MD2). Ther

(self, tbsCert, h="sha256")

    """

    def signTBSCert(self, tbsCert, h="sha256"):
        """
        Note that this will always copy the signature field from the
        tbsCertificate into the signatureAlgorithm field of the result,
        regardless of the coherence between its contents (which might
        indicate ecdsa-with-SHA512) and the result (e.g. RSA signing MD2).

        There is a small inheritance trick for the computation of sigVal
        below: in order to use a sign() method which would apply
        to both PrivKeyRSA and PrivKeyECDSA, the sign() methods of the
        subclasses accept any argument, be it from the RSA or ECDSA world,
        and then they keep the ones they're interested in.
        Here, t will be passed eventually to pkcs1._DecryptAndSignRSA.sign().
        """
        sigAlg = tbsCert.signature
        h = h or hash_by_oid[sigAlg.algorithm.val]
        sigVal = self.sign(bytes(tbsCert), h=h, t="pkcs")
        c = X509_Cert()
        c.tbsCertificate = tbsCert
        c.signatureAlgorithm = sigAlg
        c.signatureValue = _Raw_ASN1_BIT_STRING(sigVal, readable=True)
        return c

    def resignCert(self, cert):
        """Rewrite the signature of either a Cert or an X509_Cert."""