public override void Init(Parameters param, TPMProvider tpmProvider, TPMWrapper tpmWrapper)
{
base.Init(param, tpmProvider, tpmWrapper);
_digest = null;
_responseDigest = null;
_inData = TPMStoredDataCore.CreateFromBytes(param.GetValueOf <byte[]>("in_data"));
}
protected override TPMCommandResponse InternalProcess()
{
// Unencrypted authorization values, they need to be XOR-Encrypted with
// XOR(auth, SHA-1(OSAP shared secret | session nonce))
//
// OSAP_shared_secret = HMAC(key=usage secret of key handle, nonce even osap | nonce odd osap)
AuthHandle auth1OSAP = _commandAuthHelper.AssureOSAPSharedSecret(this, AuthSessionNum.Auth1);
_encAuth = _params.GetValueOf <byte[]> ("data_auth");
byte[] xorKey = new HashProvider().Hash(
new HashByteDataProvider(auth1OSAP.SharedSecret),
new HashByteDataProvider(auth1OSAP.NonceEven));
ByteHelper.XORBytes(_encAuth, xorKey);
//Load parent key if not loaded
_keyManager.LoadKey(_params.GetValueOf <string>("key"));
TPMBlob requestBlob = new TPMBlob();
requestBlob.WriteCmdHeader(TPMCmdTags.TPM_TAG_RQU_AUTH1_COMMAND, TPMOrdinals.TPM_ORD_Seal);
//key handle gets inserted later, it may be not available now
requestBlob.WriteUInt32(0);
requestBlob.Write(_encAuth, 0, 20);
TPMBlobWriteableHelper.WriteITPMBlobWritableWithUIntSize(requestBlob, _pcrInfo);
requestBlob.WriteUInt32((uint)_inData.Length);
requestBlob.Write(_inData, 0, _inData.Length);
AuthorizeMe(requestBlob);
using (_keyManager.AcquireLock())
{
requestBlob.SkipHeader();
requestBlob.WriteUInt32(_keyManager.IdentifierToHandle(_params.GetValueOf <string>("key")).Handle);
_responseBlob = TransmitMe(requestBlob);
}
CheckResponseAuthInfo();
_responseBlob.SkipHeader();
TPMStoredDataCore sealedData = TPMStoredDataCore.CreateFromTPMBlob(_responseBlob);
Parameters responseParams = new Parameters();
responseParams.AddPrimitiveType("data", ByteHelper.SerializeToBytes(sealedData));
return(new TPMCommandResponse(true, TPMCommandNames.TPM_CMD_Seal, responseParams));
}
