SabreTools/NDecrypt
1
0
Fork 0
mirror of https://github.com/SabreTools/NDecrypt.git synced 2026-07-08 18:06:38 +00:00
Code Issues 11 Packages Projects Releases 20 Wiki Activity

Slight cleanup of PartitionKeys

Browse Source
This commit is contained in:
Matt Nadareski
2024-10-13 23:42:00 -04:00
parent 7576608111
commit 864cb57d30
1 changed files with 37 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

61
NDecrypt.N3DS/PartitionKeys.cs
View File

@@ -2,6 +2,7 @@ using System;
using System.Linq;
using System.Numerics;
using NDecrypt.Core;
using Org.BouncyCastle.Crypto;
using SabreTools.Models.N3DS;
using static NDecrypt.N3DS.CommonOperations;
@@ -42,10 +43,17 @@ namespace NDecrypt.N3DS
/// <param name="development">Determine if development keys are used</param>
public PartitionKeys(DecryptArgs args, byte[]? signature, BitMasks masks, CryptoMethod method, bool development)
{
// Validate inputs
if (args.IsReady != true)
throw new InvalidOperationException($"{nameof(args)} must be initialized before use");
if (signature != null && signature.Length < 16)
throw new DataLengthException($"{nameof(signature)} must be at least 16 bytes");
// Set fields for future use
_decryptArgs = args;
_development = development;
// Set the standard KeyX values
KeyX = 0;
KeyX2C = development ? args.DevKeyX0x2C : args.KeyX0x2C;
@@ -55,40 +63,45 @@ namespace NDecrypt.N3DS
else
KeyY = new BigInteger(0);
// Set the standard normal key values
NormalKey = 0x00;
NormalKey2C = RotateLeft((RotateLeft(KeyX2C, 2, 128) ^ KeyY) + args.AESHardwareConstant, 87, 128);
// Special case for zero-key
if (masks.HasFlag(BitMasks.FixedCryptoKey))
{
Console.WriteLine("Encryption Method: Zero Key");
NormalKey = 0x00;
NormalKey2C = 0x00;
Console.WriteLine("Encryption Method: Zero Key");
return;
}
else
{
if (method == CryptoMethod.Original)
{
KeyX = development ? args.DevKeyX0x2C : args.KeyX0x2C;
Console.WriteLine("Encryption Method: Key 0x2C");
}
else if (method == CryptoMethod.Seven)
{
KeyX = development ? args.DevKeyX0x25 : args.KeyX0x25;
Console.WriteLine("Encryption Method: Key 0x25");
}
else if (method == CryptoMethod.NineThree)
{
KeyX = development ? args.DevKeyX0x18 : args.KeyX0x18;
Console.WriteLine("Encryption Method: Key 0x18");
}
else if (method == CryptoMethod.NineSix)
{
KeyX = development ? args.DevKeyX0x1B : args.KeyX0x1B;
Console.WriteLine("Encryption Method: Key 0x1B");
}
NormalKey = RotateLeft((RotateLeft(KeyX, 2, 128) ^ KeyY) + args.AESHardwareConstant, 87, 128);
// Set KeyX values based on crypto method
switch (method)
{
case CryptoMethod.Original:
Console.WriteLine("Encryption Method: Key 0x2C");
KeyX = development ? args.DevKeyX0x2C : args.KeyX0x2C;
break;
case CryptoMethod.Seven:
Console.WriteLine("Encryption Method: Key 0x25");
KeyX = development ? args.DevKeyX0x25 : args.KeyX0x25;
break;
case CryptoMethod.NineThree:
Console.WriteLine("Encryption Method: Key 0x18");
KeyX = development ? args.DevKeyX0x18 : args.KeyX0x18;
break;
case CryptoMethod.NineSix:
Console.WriteLine("Encryption Method: Key 0x1B");
KeyX = development ? args.DevKeyX0x1B : args.KeyX0x1B;
break;
}
// Set the normal key based on the new KeyX value
NormalKey = RotateLeft((RotateLeft(KeyX, 2, 128) ^ KeyY) + args.AESHardwareConstant, 87, 128);
}
/// <summary>