internal static IFreeformEntity_Msg InitKeyExchangeEndG2H_SIM(this FreeformSecurityTableCollection secTables,
IFreeformEntity_Msg request)
{
// store the partial key of the host
FFTgt_B2B_Security_KeyExchange_PartialKey tgt = request.EntityPrimaryTarget as FFTgt_B2B_Security_KeyExchange_PartialKey;
SECURITY_KEY_INDEX keyIndex = FreeformEncryptionHelper.GetSecurityKeyIndex(request);
byte[] gmuPartialKey = secTables.CreatePartialKeyGmu(keyIndex);
secTables.StoreOtherPartialKeyGmu(keyIndex, tgt.PartialKey);
secTables.CreateCommonKey(keyIndex);
// send the partial key of the gmu
IFreeformEntity_Msg response = request.CopyTo(FF_FlowDirection.G2H, new FFCreateEntityRequest_G2H_ResponseRequired()
{
MessageType = FF_AppId_G2H_MessageTypes.FreeForm,
Command = FF_AppId_G2H_Commands.ResponseRequest,
SkipTransactionId = true,
});
FFTgt_B2B_Security tgt2 = new FFTgt_B2B_Security()
{
SecurityData = new FFTgt_B2B_Security_KeyExchange_End()
{
PartialKey = gmuPartialKey,
}
};
response.AddTarget(tgt2);
return(response);
}
internal static bool StoreOtherPartialKeyGmu(this FreeformSecurityTableCollection secTables, SECURITY_KEY_INDEX key, byte[] partialKey)
{
using (ILogMethod method = Log.LogMethod(DYN_MODULE_NAME, "StoreOtherPartialKey"))
{
try
{
if (!secTables.ContainsKey(key))
{
return(false);
}
FreeformSecurityTable secTable = secTables[key];
int length = FreeformSecurityTable.KEY_SIZE;
for (int i = 0, j = length - 1; i < length; i++, j = ((j + 3) & 0x7))
{
secTable.OtherPartialKey[j] = partialKey[i];
}
// indicates that other key is generated and common key is unusable
secTable.Flags = (secTable.Flags | FreeformSecurityFlags.OtherPartialKey) & ~FreeformSecurityFlags.CommonKey;
}
catch (Exception ex)
{
method.Exception(ex);
return(false);
}
return(true);
}
}
internal static bool StoreOtherPartialKeyHost(this FreeformSecurityTableCollection secTables, SECURITY_KEY_INDEX key, byte[] partialKey)
{
using (ILogMethod method = Log.LogMethod(DYN_MODULE_NAME, "StoreOtherPartialKey"))
{
try
{
if (!secTables.ContainsKey(key))
{
return(false);
}
FreeformSecurityTable secTable = secTables[key];
int length = FreeformSecurityTable.KEY_SIZE_2;
for (int i = 0; i < length; ++i)
{
secTable.OtherPartialKey[i] = (byte)(partialKey[i] ^ ((byte)(0x50 + i)));
}
// method
secTable.Method = (((partialKey[length - 1] ^ 0xA5) >> 2) & 0x0F);
// indicates that other key is generated and common key is unusable
secTable.Flags = (secTable.Flags | FreeformSecurityFlags.OtherPartialKey) & ~FreeformSecurityFlags.CommonKey;
}
catch (Exception ex)
{
method.Exception(ex);
return(false);
}
return(true);
}
}
internal static byte[] CreatePartialKeyHost(this FreeformSecurityTableCollection secTables, SECURITY_KEY_INDEX key)
{
using (ILogMethod method = Log.LogMethod(DYN_MODULE_NAME, "CreatePartialKey"))
{
byte[] result = null;
try
{
if (!secTables.ContainsKey(key))
{
return(result);
}
FreeformSecurityTable secTable = secTables[key];
byte[] keys = alphan;
int j = 0;
if (secTable.Method > (FK_1ST - 1))
{
secTable.Method = ((0xC3 * 100) % (FK_LST - FK_1ST + 1)) + FK_1ST;
}
if (secTable.Method == (int)FreeformSecurityMethodTypes.Alpha1)
{
keys = alpha1;
}
else if (secTable.Method == (int)FreeformSecurityMethodTypes.Alpha2)
{
keys = alpha2;
}
else
{
j = secTable.Method;
}
int i = 0;
for (int k = 3; i < 8; ++i, k = (k + 3) & 7)
{
secTable.LocalPartialKey[k] = exp_mod(keys[i + j], secTable.LocalRandomNumber[i]);
}
secTable.LocalPartialKey[8] = (byte)((0xC3 | (secTable.Method << 2)) ^ 0xA5);
// indicates that local partial key is generated and common key is unusable
secTable.Flags = (secTable.Flags | FreeformSecurityFlags.LocalPartialKey) & ~FreeformSecurityFlags.CommonKey;
result = secTable.LocalPartialKey;
}
catch (Exception ex)
{
method.Exception(ex);
return(null);
}
return(result);
}
}
internal static bool Decrypt(this FreeformSecurityTableCollection secTables, FF_FlowInitiation flowInitiation, SECURITY_KEY_INDEX key, ref byte[] data)
{
switch (flowInitiation)
{
case FF_FlowInitiation.Gmu:
return(DecryptGmu(secTables, key, ref data));
default:
return(DecryptHost(secTables, key, ref data));
}
}
internal static IFreeformEntity_Msg InitKeyExchangeStartG2H_SIM(this FreeformSecurityTableCollection secTables, string ipAddress, FF_AppId_SessionIds sessionId, int transactionId)
{
FreeformEntity_Msg message = FreeformEntityFactory.CreateEntity <FFMsg_G2H>(FF_FlowDirection.G2H,
new FFCreateEntityRequest_G2H_ResponseRequired()
{
Command = FF_AppId_G2H_Commands.ResponseRequest,
MessageType = FF_AppId_G2H_MessageTypes.FreeForm,
SessionID = sessionId,
TransactionID = transactionId,
IPAddress = ipAddress,
});
InitSecurityData(message, new FFTgt_B2B_Security_KeyExchange_Request());
return(message);
}
internal static IFreeformEntity_Msg InitKeyExchangePartialKeyH2G_GMU(this FreeformSecurityTableCollection secTables,
IFreeformEntity_Msg request)
{
SECURITY_KEY_INDEX keyIndex = FreeformEncryptionHelper.GetSecurityKeyIndex(request);
byte[] hostPartialKey = secTables.CreatePartialKeyHost(keyIndex);
IFreeformEntity_Msg message = request.CopyTo(FF_FlowDirection.H2G, new FFCreateEntityRequest_H2G_ResponseRequired()
{
PollCode = FF_AppId_H2G_PollCodes.FreeformResponse,
});
InitSecurityData(message,
new FFTgt_B2B_Security_KeyExchange_PartialKey()
{
PartialKey = hostPartialKey,
});
return(message);
}
internal static bool DecryptHost(this FreeformSecurityTableCollection secTables, SECURITY_KEY_INDEX key, ref byte[] data)
{
using (ILogMethod method = Log.LogMethod(DYN_MODULE_NAME, "Decrypt"))
{
if (data == null || data.Length == 0)
{
return(false);
}
try
{
if (!secTables.ContainsKey(key))
{
return(false);
}
FreeformSecurityTable secTable = secTables[key];
if ((secTable.Flags & FreeformSecurityFlags.CommonKey) != FreeformSecurityFlags.CommonKey)
{
return(false);
}
int j = 0;
if (secTable.Method == (int)FreeformSecurityMethodTypes.Alpha2)
{
j = 5;
}
for (int i = 0; i < data.Length; ++i)
{
data[i] ^= (byte)(secTable.CommonKey[(i + j) & 0x7] ^ fudge1[i & 0xF]);
}
}
catch (Exception ex)
{
method.Exception(ex);
return(false);
}
return(true);
}
}
internal static bool CreateCommonKey(this FreeformSecurityTableCollection secTables, SECURITY_KEY_INDEX key)
{
using (ILogMethod method = Log.LogMethod(DYN_MODULE_NAME, "CreateCommonKey"))
{
try
{
if (!secTables.ContainsKey(key))
{
return(false);
}
FreeformSecurityTable secTable = secTables[key];
if (secTable.Flags != (FreeformSecurityFlags.LocalPartialKey |
FreeformSecurityFlags.OtherPartialKey))
{
return(false);
}
byte[] localNum = secTable.LocalRandomNumber;
for (int i = 0; i < FreeformSecurityTable.KEY_SIZE; i++)
{
secTable.CommonKey[i] = exp_mod(secTable.OtherPartialKey[i], localNum[i]);
}
// all the keys are now available
secTable.Flags |= (FreeformSecurityFlags.LocalPartialKey |
FreeformSecurityFlags.OtherPartialKey |
FreeformSecurityFlags.CommonKey);
}
catch (Exception ex)
{
method.Exception(ex);
return(false);
}
return(true);
}
}
internal static byte GenerateRandomNumber(this FreeformSecurityTableCollection secTables, SECURITY_KEY_INDEX key)
{
using (ILogMethod method = Log.LogMethod(DYN_MODULE_NAME, "GenerateRandomNumber"))
{
byte result = 0;
try
{
if (!secTables.ContainsKey(key))
{
return(result);
}
result = secTables[key].GenerateRandomNumber();
}
catch (Exception ex)
{
method.Exception(ex);
return(0);
}
return(result);
}
}
internal static IFreeformEntity_Msg InitKeyExchangeStatusH2G_GMU(this FreeformSecurityTableCollection secTables,
IFreeformEntity_Msg request)
{
// store the partial key of the gmu
FFTgt_B2B_Security_KeyExchange_End tgt = request.EntityPrimaryTarget as FFTgt_B2B_Security_KeyExchange_End;
SECURITY_KEY_INDEX keyIndex = FreeformEncryptionHelper.GetSecurityKeyIndex(request);
secTables.StoreOtherPartialKeyHost(keyIndex, tgt.PartialKey);
secTables.CreateCommonKey(keyIndex);
IFreeformEntity_Msg message = request.CopyTo(FF_FlowDirection.H2G, new FFCreateEntityRequest_H2G_ResponseRequired()
{
PollCode = FF_AppId_H2G_PollCodes.FreeformNoResponse,
});
InitSecurityData(message,
new FFTgt_B2B_Security_KeyExchange_Status()
{
Status = (request.EntityPrimaryTarget is FFTgt_B2B_Security_PartialKey ?
FF_AppId_ResponseStatus_Types.Success :
FF_AppId_ResponseStatus_Types.Fail),
});
return(message);
}
internal static bool ClearKeyData(this FreeformSecurityTableCollection secTables, SECURITY_KEY_INDEX key)
{
using (ILogMethod method = Log.LogMethod(DYN_MODULE_NAME, "Decrypt"))
{
try
{
if (!secTables.ContainsKey(key))
{
return(false);
}
FreeformSecurityTable secTable = secTables[key];
// clear the flags
secTable.Flags = 0;
// clear common key
for (int i = 0; i < secTable.CommonKey.Length; i++)
{
secTable.CommonKey[i] = 0;
}
// clear local key
for (int i = 0; i < secTable.LocalRandomNumber.Length; i++)
{
secTable.LocalRandomNumber[i] = 0;
}
}
catch (Exception ex)
{
method.Exception(ex);
return(false);
}
return(true);
}
}
public byte[] Decrypt(IFreeformEntity_Msg message, byte[] buffer)
{
using (ILogMethod method = Log.LogMethod(this.DYN_MODULE_NAME, "Decrypt"))
{
List <byte> result = new List <byte>();
try
{
if (message == null ||
buffer == null ||
buffer.Length == 0)
{
return(new byte[0]);
}
FreeformSecurityTableCollection securityTables = FFMsgHandlerFactory.Current.GetSecurityTables(message.IpAddress);
SECURITY_KEY_INDEX securityKey = message.GetSecurityKeyIndex();
ENCRYP_TARGETS encryptionType = (ENCRYP_TARGETS)buffer[0];
FF_FlowInitiation flowInitiation = message.FlowInitiation;
switch (encryptionType)
{
case ENCRYP_TARGETS.ET_SdsEncryption:
{
byte[] bufferCopy = buffer.CopyToBuffer(1, buffer.Length - 1);
FreeformEncryptionHelper.Decrypt(securityTables, flowInitiation, securityKey, ref bufferCopy);
result.AddRange(bufferCopy);
}
break;
case ENCRYP_TARGETS.ET_SdsAuthentication:
case ENCRYP_TARGETS.ET_EFTStyleEncryption:
{
byte authenticationByteReceived = buffer[1];
byte[] bufferCopy = buffer.CopyToBuffer(2, buffer.Length - 2);
FreeformEncryptionHelper.Decrypt(securityTables, flowInitiation, securityKey, ref bufferCopy);
byte authenticationByteGenerated = FreeformEncryptionHelper.MakeAuthenticationByte(bufferCopy);
if (encryptionType == ENCRYP_TARGETS.ET_EFTStyleEncryption)
{
byte[] temp = new byte[] { authenticationByteGenerated };
FreeformEncryptionHelper.Decrypt(securityTables, flowInitiation, securityKey, ref temp);
authenticationByteGenerated = temp[0];
}
if (authenticationByteReceived == authenticationByteGenerated)
{
result.AddRange(bufferCopy);
}
}
break;
default:
break;
}
}
catch (Exception ex)
{
method.Exception(ex);
}
return(result.ToArray());
}
}
public List <byte> Encrypt(IFreeformEntity_Msg message, IFreeformEntity_MsgTgt target, List <byte> buffer)
{
using (ILogMethod method = Log.LogMethod(this.DYN_MODULE_NAME, "Encrypt"))
{
List <byte> result = new List <byte>();
try
{
if (message == null ||
buffer == null ||
buffer.Count == 0)
{
return(result);
}
byte[] source = buffer.ToArray();
FreeformSecurityTableCollection securityTables = FFMsgHandlerFactory.Current.GetSecurityTables(message.IpAddress);
SECURITY_KEY_INDEX securityKey = message.GetSecurityKeyIndex();
FF_AppId_Encryption_Types encryptionType = target.EncryptionType;
if (target.PrimaryTarget != null &&
target.PrimaryTarget.EncryptionType != FF_AppId_Encryption_Types.None)
{
encryptionType = target.PrimaryTarget.EncryptionType;
}
FF_FlowInitiation flowInitiation = message.FlowInitiation;
switch (encryptionType)
{
case FF_AppId_Encryption_Types.Standard:
{
FreeformEncryptionHelper.Encrypt(securityTables, flowInitiation, securityKey, ref source);
result.Add((byte)ENCRYP_TARGETS.ET_SdsEncryption);
result.AddRange(source);
}
break;
case FF_AppId_Encryption_Types.AuthByteClearData:
case FF_AppId_Encryption_Types.AuthByteEncryptedData:
{
byte[] authenticationByte = new byte[] { FreeformEncryptionHelper.MakeAuthenticationByte(source) };
if (encryptionType == FF_AppId_Encryption_Types.AuthByteEncryptedData)
{
result.Add((byte)ENCRYP_TARGETS.ET_EFTStyleEncryption);
FreeformEncryptionHelper.Encrypt(securityTables, flowInitiation, securityKey, ref authenticationByte);
}
else
{
result.Add((byte)ENCRYP_TARGETS.ET_SdsAuthentication);
}
FreeformEncryptionHelper.Encrypt(securityTables, flowInitiation, securityKey, ref source);
result.AddRange(authenticationByte);
result.AddRange(source);
}
break;
default:
result = buffer;
break;
}
}
catch (Exception ex)
{
method.Exception(ex);
}
return(result);
}
}
internal static byte[] CreatePartialKeyGmu(this FreeformSecurityTableCollection secTables, SECURITY_KEY_INDEX key)
{
using (ILogMethod method = Log.LogMethod(DYN_MODULE_NAME, "CreatePartialKey"))
{
byte[] result = null;
try
{
if (!secTables.ContainsKey(key))
{
return(result);
}
FreeformSecurityTable secTable = secTables[key];
byte[] keys = alphan;
int j = 0;
// initial method
if (secTable.Method == (int)FreeformSecurityMethodTypes.None)
{
secTable.Method = (int)FreeformSecurityMethodTypes.Alpha1;
}
if (secTable.Method == (int)FreeformSecurityMethodTypes.Alpha1)
{
keys = alpha1;
}
else if (secTable.Method == (int)FreeformSecurityMethodTypes.Alpha2)
{
keys = alpha2;
}
else
{
j = secTable.Method;
}
// 0 - 7
for (int i = 0; i < FreeformSecurityTable.KEY_SIZE; i++)
{
secTable.LocalPartialKey[i] = Convert.ToByte((exp_mod(keys[i + j], secTable.LocalRandomNumber[i]))
^ Convert.ToByte(0x50 + i));
}
// 8
j = FreeformSecurityTable.KEY_SIZE;
secTable.LocalPartialKey[j] = Convert.ToByte(((secTable.LocalRandomNumber[j] & 0xC3) |
(secTable.Method << 2)) ^ 0xA5);
// indicates that local partial key is generated and common key is unusable
secTable.Flags = (secTable.Flags | FreeformSecurityFlags.LocalPartialKey) & ~FreeformSecurityFlags.CommonKey;
result = secTable.LocalPartialKey;
}
catch (Exception ex)
{
method.Exception(ex);
return(null);
}
return(result);
}
}
