Tpm2Lib.TpmPolicySigned.Execute C# (CSharp) Method

        internal override TpmRc Execute(Tpm2 tpm, AuthSession authSession, PolicyTree policy)
        {
            byte[] nonceTpm = UseNonceTpm ? Globs.CopyData(authSession.NonceTpm) : new byte[0];

            var dataToSign = new Marshaller();
            dataToSign.Put(nonceTpm, "");
            ISignatureUnion signature;
            // If the library has been given a signing key we can do the challenge here (else we need to call out)
            TpmHandle verificationKey;
            if (SigningKey != null)
            {
                dataToSign.Put(ExpirationTime, "");
                dataToSign.Put(CpHash, "");
                dataToSign.Put(PolicyRef, "");
                // Just ask the key to sign the challenge
                signature = SigningKey.Sign(dataToSign.GetBytes());
                verificationKey = tpm.LoadExternal(null, SigningKeyPub, TpmRh.Owner);
            }
            else
            {
                TpmPublic verifier;
                signature = AssociatedPolicy.ExecuteSignerCallback(this, nonceTpm, out verifier);
                verificationKey = tpm.LoadExternal(null, verifier, TpmRh.Owner);
            }
            TkAuth policyTicket;

            Timeout = tpm.PolicySigned(verificationKey,
                                       authSession,
                                       nonceTpm,
                                       CpHash,
                                       PolicyRef,
                                       ExpirationTime,
                                       signature,
                                       out policyTicket);

            TpmRc responseCode = tpm._GetLastResponseCode();
            // Save the policyTicket in case it is needed later
            PolicyTicket = policyTicket;
            tpm.FlushContext(verificationKey);
            return responseCode;
        }