internal static byte GenerateRandomNumber(this FreeformSecurityTable secTable) { using (ILogMethod method = Log.LogMethod(DYN_MODULE_NAME, "GenerateRandomNumber")) { byte result = 0; try { int count = 10; while (count-- > 0) { byte[] lohi = secTable.GenerateRandomNumberLowHigh(); secTable.PartialKeyIndex = (byte)(secTable.PartialKeyIndex > 0 ? secTable.PartialKeyIndex - 1 : 8); result = (byte)(lohi[0] ^ lohi[1]);// ^ secTable.OtherPartialKey[secTable.PartialKeyIndex]); if (result > 0) { break; } } } catch (Exception ex) { method.Exception(ex); return(0); } return(result); } }
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 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 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 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 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); } }
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); } }