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Unify 4-step handling of keys

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This commit is contained in:
Matt Nadareski
2026-03-22 00:48:53 -04:00
parent bdac2d0334
commit 28fe0a9f80
1 changed files with 14 additions and 13 deletions
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27
NDecrypt.Core/PartitionKeys.cs
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@@ -60,15 +60,8 @@ namespace NDecrypt.Core
}
// Set the standard normal key values
NormalKey = keyX.RotateLeft(2);
NormalKey = NormalKey.Xor(KeyY);
NormalKey = NormalKey.Add(hardwareConstant);
NormalKey = NormalKey.RotateLeft(87);
NormalKey2C = keyX0x2C.RotateLeft(2);
NormalKey2C = NormalKey2C.Xor(KeyY);
NormalKey2C = NormalKey2C.Add(hardwareConstant);
NormalKey2C = NormalKey2C.RotateLeft(87);
NormalKey = ProcessKey(keyX, KeyY, hardwareConstant);
NormalKey2C = ProcessKey(keyX0x2C, KeyY, hardwareConstant);
}
/// <summary>
@@ -91,10 +84,18 @@ namespace NDecrypt.Core
}
// Encrypting RomFS for partitions 1 and up always use Key0x2C
NormalKey = keyX0x2C.RotateLeft(2);
NormalKey = NormalKey.Xor(KeyY);
NormalKey = NormalKey.Add(hardwareConstant);
NormalKey = NormalKey.RotateLeft(87);
NormalKey = ProcessKey(keyX0x2C, KeyY, hardwareConstant);
}
/// <summary>
/// Process a key with the standard processing steps
/// </summary>
private static byte[] ProcessKey(byte[] keyBase, byte[] keyY, byte[] hardwareConstant)
{
byte[] processed = keyBase.RotateLeft(2);
processed = processed.Xor(keyY);
processed = processed.Add(hardwareConstant);
return processed.RotateLeft(87);
}
}
}