void TestCertifyX509_1(Tpm2 tpm, TestContext testCtx)
{
testCtx.ReportParams("Test phase: TestCertifyX509_1");
var policy = new PolicyTree(TpmAlgId.Sha256);
policy.SetPolicyRoot(new TpmPolicyCommand(TpmCc.CertifyX509));
var keyTemplate = new TpmPublic(
TpmAlgId.Sha256,
ObjectAttr.Restricted | ObjectAttr.Sign | ObjectAttr.FixedParent | ObjectAttr.FixedTPM | ObjectAttr.UserWithAuth | ObjectAttr.AdminWithPolicy | ObjectAttr.SensitiveDataOrigin,
policy.GetPolicyDigest(),
new RsaParms(new SymDefObject(), new SchemeRsassa(TpmAlgId.Sha256), 2048, 0),
new Tpm2bPublicKeyRsa()
);
// Make two keys
TpmPublic certifyingKeyPub, keyToBeCertifiedPub;
TpmHandle hCertifyingKey = Substrate.CreatePrimary(tpm, keyTemplate, out certifyingKeyPub);
TpmHandle hKeyToBeCertified = Substrate.CreatePrimary(tpm, keyTemplate, out keyToBeCertifiedPub);
var partialCert = CertifyX509Support.MakeExemplarPartialCert();
var partialCertBytes = partialCert.GetDerEncoded();
// If you want to paste in your own hex put it here and s
//var partialCertBytes = Globs.ByteArrayFromHex("01020304");
AuthSession sess = tpm.StartAuthSessionEx(TpmSe.Policy, TpmAlgId.Sha256);
sess.RunPolicy(tpm, policy);
// I used this to test that the auth is OK. Of course you need to change the PolicyCommandCode above
//var attestInfo = tpm[sess].Certify(hKeyToBeCertified, hCertifyingKey, new byte[0], new NullSigScheme(), out var legacySignature);
byte[] tbsHash;
ISignatureUnion signature;
byte[] addedTo = tpm[sess].CertifyX509(hKeyToBeCertified, hCertifyingKey, new byte[0], new NullSigScheme(), partialCertBytes, out tbsHash, out signature);
var addedToCert = AddedToCertificate.FromDerEncoding(addedTo);
var returnedCert = CertifyX509Support.AssembleCertificate(partialCert, addedToCert, ((SignatureRsa)signature).GetTpmRepresentation());
// Does the expected hash match the returned hash?
var tbsBytes = returnedCert.GetTbsCertificate();
var expectedTbsHash = TpmHash.FromData(TpmAlgId.Sha256, tbsBytes);
Debug.Assert(Globs.ArraysAreEqual(expectedTbsHash.HashData, tbsHash));
// If you get this far we can check the cert is properly signed but we'll need to do a
// bit of TPM<->Bouncy Castle data type conversion.
tpm.FlushContext(hCertifyingKey);
tpm.FlushContext(hKeyToBeCertified);
} // TestCertifyX509_1
void TestCertifyX509Impl(Tpm2 tpm, TestContext testCtx,
TpmPublic subjectTemplate, TpmPublic sigKeyTemplate,
PolicyTree policy, string testLabel)
{
var partialCert = X509Helpers.MakePartialCert(subjectTemplate);
var partialCertBytes = partialCert.GetDerEncoded();
// If you want to paste in your own hex put it here and s
//var partialCertBytes = Globs.ByteArrayFromHex("01020304");
// Certify RSA with RSA
TpmPublic certifyingKeyPub, keyToBeCertifiedPub;
TpmHandle hSigKey = Substrate.CreatePrimary(tpm, sigKeyTemplate, out certifyingKeyPub);
TpmHandle hSubjectKey = Substrate.CreatePrimary(tpm, subjectTemplate, out keyToBeCertifiedPub);
AuthSession sess = tpm.StartAuthSessionEx(TpmSe.Policy, TpmAlgId.Sha256);
sess.RunPolicy(tpm, policy);
ISignatureUnion sig;
byte[] tbsHash;
byte[] addedTo = tpm[sess].CertifyX509(hSubjectKey, hSigKey,
null, new NullSigScheme(), partialCertBytes,
out tbsHash, out sig);
tpm.FlushContext(sess);
tpm.FlushContext(hSubjectKey);
var addedToCert = AddedToCertificate.FromDerEncoding(addedTo);
X509Certificate returnedCert = X509Helpers.AssembleCertificate(partialCert, addedToCert,
sig is SignatureRsa ? ((SignatureRsa)sig).GetTpmRepresentation()
: ((SignatureEcc)sig).GetTpmRepresentation());
// Does the expected hash match the returned hash?
var tbsBytes = returnedCert.GetTbsCertificate();
var expectedTbsHash = TpmHash.FromData(TpmAlgId.Sha256, tbsBytes);
Debug.Assert(Globs.ArraysAreEqual(expectedTbsHash.HashData, tbsHash));
// Is the cert properly signed?
if (TpmHelper.GetScheme(sigKeyTemplate).GetUnionSelector() != TpmAlgId.Rsapss)
{
// Software crypto layer does not support PSS
bool sigOk = certifyingKeyPub.VerifySignatureOverHash(tbsHash, sig);
if (sigKeyTemplate.type == TpmAlgId.Ecc)
{
#if !__NETCOREAPP2__
// No ECC in .Net Core
testCtx.Assert("Sign" + testLabel, sigOk);
#endif
}
else
{
testCtx.Assert("Sign" + testLabel, sigOk);
}
}
tpm.VerifySignature(hSigKey, tbsHash, sig);
tpm.FlushContext(hSigKey);
}
