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Verify encrypted ints on read

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throw an exception if corrupt
This commit is contained in:
Kurt 2020-04-03 17:44:44 -07:00
parent f5e96480fd
commit ea5482cfc9
2 changed files with 13 additions and 3 deletions
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10
NHSE.Core/Encryption/EncryptedInt32.cs
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@ -9,6 +9,7 @@ public sealed class EncryptedInt32
// Base shift count used in the encryption.
private const byte SHIFT_BASE = 3;
public readonly uint OriginalEncrypted;
public uint Value;
public ushort Adjust;
public byte Shift;
@ -18,6 +19,7 @@ public sealed class EncryptedInt32
public EncryptedInt32(uint encryptedValue, ushort adjust = 0, byte shift = 0, byte checksum = 0)
{
OriginalEncrypted = encryptedValue;
Adjust = adjust;
Shift = shift;
Checksum = checksum;
@ -64,6 +66,14 @@ private static uint Encrypt(uint value, byte shift, ushort adjust)
return (uint) ((val >> 32) + val);
}
public static EncryptedInt32 ReadVerify(byte[] data, int offset)
{
var val = Read(data, offset);
if (val.Checksum != CalculateChecksum(val.OriginalEncrypted))
throw new ArgumentException(nameof(offset));
return val;
}
public static EncryptedInt32 Read(byte[] data, int offset)
{
var enc = BitConverter.ToUInt32(data, offset + 0);

6
NHSE.Core/Save/Files/Personal.cs
View File

@ -42,19 +42,19 @@ public string PlayerName
public EncryptedInt32 Wallet
{
get => EncryptedInt32.Read(Data, Offsets.Wallet);
get => EncryptedInt32.ReadVerify(Data, Offsets.Wallet);
set => value.Write(Data, Offsets.Wallet);
}
public EncryptedInt32 Bank
{
get => EncryptedInt32.Read(Data, Offsets.Bank);
get => EncryptedInt32.ReadVerify(Data, Offsets.Bank);
set => value.Write(Data, Offsets.Bank);
}
public EncryptedInt32 NookMiles
{
get => EncryptedInt32.Read(Data, Offsets.NookMiles);
get => EncryptedInt32.ReadVerify(Data, Offsets.NookMiles);
set => value.Write(Data, Offsets.NookMiles);
}