void LoadExternalFullRsaKeySample(Tpm2 tpm, TestContext testCtx)
{
var hashAlg = TpmAlgId.Sha256;
var inPub = new TpmPublic(hashAlg,
ObjectAttr.Decrypt | ObjectAttr.UserWithAuth | ObjectAttr.SensitiveDataOrigin,
null,
new RsaParms(new SymDefObject(), new SchemeOaep(hashAlg), 2048, 0),
new Tpm2bPublicKeyRsa());
// Create a software RSA key
var swKey = new AsymCryptoSystem(inPub);
// The crucial point in loading a software key is preparing the TPM-formatted private part of the key
Sensitive sens = swKey.GetSensitive();
TpmHandle extKey = tpm.LoadExternal(sens, swKey.GetPublicParms(), TpmRh.Null);
//
// Make sure that the key was loaded correctly
//
// This particular label is used by the TPM while doing OAEP for its internal protocols
// (though in n general any label can be used).
byte[] label = RawRsa.GetLabel("OaepLabel");
byte[] origMsg = Substrate.RandomBytes(64);
// Encrypt using software key (the paublic part is used)
byte[] encMsg = swKey.EncryptOaep(origMsg, label);
testCtx.AssertNotEqual("SwEnc", origMsg, encMsg);
// Decrypt using the TPM (the private part is used)
byte[] decMsg = tpm.RsaDecrypt(extKey, encMsg, null, label);
testCtx.AssertEqual("CrossEncDec", origMsg, decMsg);
tpm.FlushContext(extKey);
}
