/// <summary>
/// Construct and send CLIENT_LICENSE_INFO
/// Meanwhile, generate the two licensing keys: licensing encryption key and MAC salt key.
/// </summary>
public void SendClientLicenseInformation(KeyExchangeAlg preferredKeyExchangeAlg, uint platformId, byte[] licenseInfo, CLIENT_HARDWARE_ID clientHardwareID)
{
CLIENT_LICENSE_INFO info = new CLIENT_LICENSE_INFO();
info.PreferredKeyExchangeAlg = preferredKeyExchangeAlg;
info.PlatformId = platformId;
info.LicenseInfo.blobData = licenseInfo;
info.LicenseInfo.wBlobLen = (ushort)licenseInfo.Length;
info.LicenseInfo.wBlobType = wBlobType_Values.BB_DATA_BLOB;
var random = new Random();
clientRandom = new byte[32];
random.NextBytes(clientRandom);
info.ClientRandom = clientRandom;
preMasterSecret = new byte[48];
random.NextBytes(preMasterSecret);
EncryptionAlgorithm.GenerateLicensingKeys(preMasterSecret, clientRandom, serverRandom, out macSaltKey, out licensingEncryptionKey);
if (macSaltKey == null)
{
throw new Exception("The generated MAC-salt-key should not be NULL!");
}
if (licensingEncryptionKey == null)
{
throw new Exception("The generated LicensingEncryptionKey should not be NULL!");
}
info.EncryptedPreMasterSecret.blobData = RdpbcgrUtility.GenerateEncryptedRandom(preMasterSecret, publicExponent, modulus);
info.EncryptedPreMasterSecret.wBlobLen = (ushort)info.EncryptedPreMasterSecret.blobData.Length;
info.EncryptedPreMasterSecret.wBlobType = wBlobType_Values.BB_RANDOM_BLOB;
CLIENT_HARDWARE_ID hardwareID = new CLIENT_HARDWARE_ID();
hardwareID = clientHardwareID;
info.EncryptedHWID.wBlobType = wBlobType_Values.BB_ENCRYPTED_DATA_BLOB;
var hardwareIDBytes = TypeMarshal.ToBytes <CLIENT_HARDWARE_ID>(hardwareID);
info.EncryptedHWID.blobData = RC4(hardwareIDBytes);
info.EncryptedHWID.wBlobLen = (ushort)info.EncryptedHWID.blobData.Length;
// MACData (16 bytes): An array of 16 bytes containing an MD5 digest (Message Authentication Code (MAC))
// that is generated over the unencrypted Client Hardware Identification structure.
info.MACData = EncryptionAlgorithm.GenerateNonFIPSDataSignature(macSaltKey, hardwareIDBytes, 16 * 8); // n is 16 * 8 bits.
TS_LICENSE_PDU pdu = ConstructLicensePDU(bMsgType_Values.LICENSE_INFO, new LicensingMessage {
ClientLicenseInfo = info
});
rdpbcgrClient.SendBytes(pdu.ToBytes());
}
/// <summary>
/// Construct and send CLIENT_NEW_LICENSE_REQUEST
/// Meanwhile, generate the two licensing keys: licensing encryption key and MAC salt key.
/// </summary>
public void SendClientNewLicenseRequest(KeyExchangeAlg preferredKeyExchangeAlg, uint platformId, string clientUserName, string clientMachineName)
{
CLIENT_NEW_LICENSE_REQUEST request = new CLIENT_NEW_LICENSE_REQUEST();
request.PreferredKeyExchangeAlg = preferredKeyExchangeAlg;
request.PlatformId = platformId;
var random = new Random();
clientRandom = new byte[32];
random.NextBytes(clientRandom);
request.ClientRandom = clientRandom;
preMasterSecret = new byte[48];
random.NextBytes(preMasterSecret);
// Generate licensingEncryptionKey and macSaltKey
EncryptionAlgorithm.GenerateLicensingKeys(preMasterSecret, clientRandom, serverRandom, out macSaltKey, out licensingEncryptionKey);
if (macSaltKey == null)
{
throw new Exception("The generated MAC-salt-key should not be NULL!");
}
if (licensingEncryptionKey == null)
{
throw new Exception("The generated LicensingEncryptionKey should not be NULL!");
}
try
{
request.EncryptedPreMasterSecret.blobData = RdpbcgrUtility.GenerateEncryptedRandom(preMasterSecret, publicExponent, modulus);
request.EncryptedPreMasterSecret.wBlobLen = (ushort)request.EncryptedPreMasterSecret.blobData.Length;
request.EncryptedPreMasterSecret.wBlobType = wBlobType_Values.BB_RANDOM_BLOB;
request.ClientUserName.wBlobType = wBlobType_Values.BB_CLIENT_USER_NAME_BLOB;
request.ClientUserName.blobData = Encoding.UTF8.GetBytes(clientUserName);
request.ClientUserName.wBlobLen = (ushort)request.ClientUserName.blobData.Length;
request.ClientMachineName.wBlobType = wBlobType_Values.BB_CLIENT_MACHINE_NAME_BLOB;
request.ClientMachineName.blobData = Encoding.UTF8.GetBytes(clientMachineName);
request.ClientMachineName.wBlobLen = (ushort)request.ClientMachineName.blobData.Length;
TS_LICENSE_PDU pdu = ConstructLicensePDU(bMsgType_Values.NEW_LICENSE_REQUEST, new LicensingMessage {
ClientNewLicenseRequest = request
});
var bytes = pdu.ToBytes();
rdpbcgrClient.SendBytes(bytes);
}
catch (Exception e)
{
throw e;
}
}
